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US4707608A Expired / Lapsed US ⏱️ 0.0 years remaining

Kinestatic charge detection using synchronous displacement of detecting device

Assignee: University of North Carolina at Chapel Hill
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Filing: 1985-04-10
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Granted: 1987-11-17
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Expires: 2005-04-10
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Abstract

Abstract A technique for detecting the spatial distribution of propagating energy induces secondary energy produced in a detector to drift in a predetermined direction at a predetermined velocity and synchronously moves the detector in a direction opposite to the direction of drift of the secondary energy at a velocity equal in magnitude to the magnitude of the velocity of drift of the secondary energy. Although the secondary energy is drifting with respect to the detector, the synchronous detector movement causes the secondary energy to appear stationary with respect to a source of radiation, resulting in "kinestatis" of the secondary energy. The secondary energy resulting from the radiation integrates along stationary paths in the detector (operated as a "kinestatic detector") and is subsequently detected when a collection volume of the detector sweeps through the stationary secondary energy. Signal integration can occur over long periods of time while resolution in the direction of movement of the detector is determined by the detector output sampling rate. A detector having n-by-l detecting elements can simulate the operation of an n-by-m element detector for use in digital radiography and computed tomography and other imaging and non-imaging sensing techniques. The detector may take the form of a xenon gas ionization chamber. Field distortion eliminating techniques are used to eliminate variations in charge carrier drift velocity in such an ionization chamber. Charge carrier mobility and drift velocity are adjusted to synchronize charge carrier movement with detector movement.

Inventors

  • 👤 Frank A. DiBianca

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 04:33
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; G; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2921; G01T1/2935; H; H01; H01J; H01J47/00; H01J47/02

Claims Analysis

Total Claims: 126
Claim 1
Independent Claim 85 words
An apparatus for detecting propagating energy comprising: means for defining a space upon which propagating energy is incident; medium means, disposed within said space, for interacting with said incident energy to produce secondary energy; first position-changing means for non-randomly changing the position of the secondary energy within said space relative to said medium means; second position-changing means for changing the position of said space synchronously with the change of position of said secondary energy; and detecting means for detecting the secondary energy in said space.
Claim 2
Independent Claim 85 words
An apparatus for detecting propagating energy comprising: means for defining a space upon which propagating energy is incident; medium means, disposed within said space, for interacting with said incident energy to produce secondary energy; first position-changing means for non-randomly changing the position of the secondary energy within said space relative to said medium means; second position-changing means for changing the position of said space synchronously with the change of position of said secondary energy; and detecting means for detecting the secondary energy in said space.
Claim 3
Dependent Claim 55 words
An apparatus as in claim 1 wherein said second position-changing means comprises means for moving said space in a direction opposite to the direction of motion of said secondary energy with respect to said medium means at a velocity equal in magnitude to the velocity of said secondary energy with respect to said medium means.
Claim 4
Dependent Claim 29 words
An apparatus as in claim 1 wherein: said secondary energy includes charge carriers; and said first position-changing means comprises means for producing a uniform electric field within said space.
Claim 5
Dependent Claim 56 words
An apparatus as in claim 3 wherein: said electric field induces said charge carriers to drift through said space at a first substantially constant velocity in a first substantially constant direction; and said second position-changing means comprises means for displacing said space-defining means at said first velocity in a second direction opposite to said first direction.
Claim 6
Dependent Claim 33 words
An apparatus as in claim 4 further comprising means for directing said incident energy perpendicularly to said first and second directions into said medium means to produce charge carriers in said medium means.
Claim 7
Dependent Claim 24 words
An apparatus as in claim 4 wherein said electric-field-producing means produces an electric field having a direction parallel to said first and second directions.
Claim 8
Dependent Claim 32 words
An apparatus as in claim 1 wherein said first position-changing means comprises means for inducing the secondary energy to drift through said space at a constant drift velocity in a predetermined direction.
Claim 9
Dependent Claim 31 words
An apparatus as in claim 1 wherein: said apparatus further includes means for defining a collection volume within said space; and said detecting means detects secondary energy within said collection volume.
Claim 10
Dependent Claim 36 words
An apparatus as in claim 8 wherein said detecting means comprises: means for detecting the position of secondary energy within said collection volume; and means for detecting the time said secondary energy enters said collection volume.
Claim 11
Dependent Claim 79 words
An apparatus as in claim 9 wherein: said energy-position-detecting means comprises means for sensing the position of secondary energy within said collection volume along a first coordinate axis; and said apparatus further includes: means for creating secondary energy in said space, and means for determining a position of creation of secondary energy in said space along a second coordinate axis perpendicular to said first coordinate axis in response to the detected time said secondary energy enters said collection volume.
Claim 12
Independent Claim 85 words
An apparatus for detecting radiation comprising medium means for producing at least one charge carrier in response to radiation incident thereto; charge carrier displacing means for non-randomly changing non-randomly changing the position of said charge carrier relative to said medium means in a first direction; medium displacing means for changing the position of said medium means synchronously with the change in position of said charge carrier in a second direction opposite to the first direction; and detecting means for detecting charge carriers in said medium.
Claim 13
Independent Claim 85 words
An apparatus for detecting radiation comprising medium means for producing at least one charge carrier in response to radiation incident thereto; charge carrier displacing means for non-randomly changing non-randomly changing the position of said charge carrier relative to said medium means in a first direction; medium displacing means for changing the position of said medium means synchronously with the change in position of said charge carrier in a second direction opposite to the first direction; and detecting means for detecting charge carriers in said medium.
Claim 14
Dependent Claim 44 words
An apparatus as in claim 11 wherein said medium displacing means comprises means for moving said medium means in a direction opposite to the direction of motion of said charge carrier at a velocity equal in magnitude to the velocity of said charge carrier.
Claim 15
Dependent Claim 22 words
An apparatus as in claim 11 wherein said charge-carrier-displacing means comprises means for producing a uniform electric field within said medium means.
Claim 16
Dependent Claim 54 words
An apparatus as in claim 13 wherein: said electric field induces said charge carrier to drift through said medium means at a first substantially constant velocity in the first direction; and said medium-displacing means comprises means for displacing said medium means at said first velocity in the second direction opposite to said first direction.
Claim 17
Dependent Claim 25 words
An apparatus as in claim 14 further comprising means for directing said incident radiation into said medium means perpendicularly to said first and second directions.
Claim 18
Dependent Claim 28 words
An apparatus as in claim 14 wherein said electric field produced by said electric field producing means is in a direction parallel to said first and second directions.
Claim 19
Dependent Claim 32 words
An apparatus as in claim 11 wherein said charge-carrier-displacing means comprises means for inducing said charge carrier to drift through said medium means at a constant drift velocity in a predetermined direction.
Claim 20
Dependent Claim 32 words
An apparatus as in claim 11 wherein: said apparatus further includes means for defining a collection volume adjacent to said medium; and said detecting means detects charge carriers within said collection volume.
Claim 21
Dependent Claim 36 words
An apparatus as in claim 18 wherein said detecting means comprises: means for detecting the position of charge carriers within said collection volume; and means for detecting the time said charge carriers enter said collection volume.
Claim 22
Dependent Claim 73 words
An apparatus as in claim 19 wherein: said charge-carrier position-detecting means comprises means for sensing the position of said charge carrier within said collection volume along a first coordinate axis; and said apparatus further includes means for determining the position at which said charge carrier was produced in said medium means along a second coordinate axis perpendicular to said first coordinate axis in response to the time detected by said time detecting means.
Claim 23
Independent Claim 69 words
An apparatus for storing information comprising: a medium; means for selectively producing charge carriers in said medium; means for preventing said charge carriers from recombining by biasing said charge carriers to move in a first direction; means for displacing said medium relative to said charge-carriers-producing means in a second direction opposite to the first direction; and detecting means for detecting charge carriers within a predetermined portion of said medium.
Claim 24
Independent Claim 69 words
An apparatus for storing information comprising: a medium; means for selectively producing charge carriers in said medium; means for preventing said charge carriers from recombining by biasing said charge carriers to move in a first direction; means for displacing said medium relative to said charge-carriers-producing means in a second direction opposite to the first direction; and detecting means for detecting charge carriers within a predetermined portion of said medium.
Claim 25
Dependent Claim 26 words
An apparatus as in claim 21 wherein said recombining preventing means comprises means for non-randomly changing the position of said charge carriers relative to said medium.
Claim 26
Dependent Claim 22 words
An apparatus as in claim 21 wherein said charge carrier producing means comprises means for selectively directing ionizing radiation into said medium.
Claim 27
Independent Claim 71 words
An apparatus for integrating charge comprising; a medium; means for continuously directing radiation along a path passing through said medium, said medium producing secondary energy in proximity to said path in response to said radiation; means for maintaining said secondary energy in proximity to said path and for preventing said secondary energy from recombining with said medium; and means for measuring the amount of secondary energy in proximity to said path.
Claim 28
Independent Claim 71 words
An apparatus for integrating charge comprising; a medium; means for continuously directing radiation along a path passing through said medium, said medium producing secondary energy in proximity to said path in response to said radiation; means for maintaining said secondary energy in proximity to said path and for preventing said secondary energy from recombining with said medium; and means for measuring the amount of secondary energy in proximity to said path.
Claim 29
Dependent Claim 39 words
An apparatus as in claim 24 wherein said maintaining means comprises: means for displacing said secondary energy relative to said medium; and means for displacing said medium relative to said path synchronously with the displacement of said secondary energy.
Claim 30
Dependent Claim 31 words
An apparatus as in claim 25 wherein said energy-displacing means comprises means for inducing said secondary energy to drift through said medium at a constant drift velocity in a predetermined direction.
Claim 31
Dependent Claim 27 words
An apparatus as in claim 25 wherein: said secondary energy includes ions; and said energy-displacing means comprises means for producing a uniform electric field through said medium.
Claim 32
Dependent Claim 58 words
An apparatus as in claim 27 wherein: said electric field produced by said electric-field-producing means induces said ions to drift through said medium at a first substantially constant velocity in a first substantially constant direction; and said medium-displacing means comprises means for displacing said medium at said first velocity in a second direction opposite to said first direction.
Claim 33
Dependent Claim 24 words
An apparatus as in claim 28 wherein said electric-field-producing means produces an electric field having a direction parallel to said first and second directions.
Claim 34
Dependent Claim 17 words
An apparatus as in claim 28 wherein said path is perpendicular to said first and second directions.
Claim 35
Dependent Claim 32 words
An apparatus as in claim 28 wherein said radiation-directing means includes: means for producing x-rays; and collimating means for focusing said x-rays into a beam perpendicular to said first and second directions.
Claim 36
Dependent Claim 58 words
An apparatus as in claim 24 wherein: said radiation directing means selectively directs radiation-along a plurality of parallel paths passing through said medium to produce secondary energy in proximity to each of said paths; and said maintaining means also maintains secondary energy produced in proximity to each of said plurality of paths in proximity to each said paths.
Claim 37
Dependent Claim 33 words
An apparatus as in claim 24 wherein: said apparatus further includes means for defining a collection volume adjacent to said medium; and said measuring means measures the secondary energy within said collection volume.
Claim 38
Dependent Claim 36 words
An apparatus as in claim 33 wherein said measuring means comprises: means for detecting the position of secondary energy within said collection volume; and means for detecting the time said secondary energy enters said collection volume.
Claim 39
Dependent Claim 72 words
An apparatus as in claim 34 wherein: said energy-position detecting means comprises means for sensing the position of said secondary energy within said collection volume along a first coordinate axis; and said apparatus further includes means for determining the position in said medium along a second coordinate axis perpendicular to said first coordinate axis at which said secondary energy is produced in response to the time detected by said time detecting means.
Claim 40
Independent Claim 174 words
An apparatus for detecting the spatial distribution and intensity of radiation, comprising: a first means for conducting electrical current; a second means for conducting electrical current; means for fixing the position of said second conducting means with respect to said first conducting means to define a gap therebetween; radiation source means for directing ionizing radiation into said gap; medium means, disposed within said gap, for ionizing in response to said radiation to produce charge carriers; charge carrier displacing means, electrically connected to said first and second conducting means, for inducing the charge carriers within said gap to drift at a velocity v drift in a first direction; moving means, coupled to at least one of said source means and said medium means, for moving said medium means relative to said source means in a second direction opposite to said first direction at a velocity v scan having a magnitude substantially equal to the magnitude of the velocity v drift of said drifting charge carriers; and detecting means for detecting charge carriers in said gap.
Claim 41
Independent Claim 174 words
An apparatus for detecting the spatial distribution and intensity of radiation, comprising: a first means for conducting electrical current; a second means for conducting electrical current; means for fixing the position of said second conducting means with respect to said first conducting means to define a gap therebetween; radiation source means for directing ionizing radiation into said gap; medium means, disposed within said gap, for ionizing in response to said radiation to produce charge carriers; charge carrier displacing means, electrically connected to said first and second conducting means, for inducing the charge carriers within said gap to drift at a velocity v drift in a first direction; moving means, coupled to at least one of said source means and said medium means, for moving said medium means relative to said source means in a second direction opposite to said first direction at a velocity v scan having a magnitude substantially equal to the magnitude of the velocity v drift of said drifting charge carriers; and detecting means for detecting charge carriers in said gap.
Claim 42
Dependent Claim 40 words
An apparatus as in claim 36 wherein said radiation source means comprises: means for producing x-radiation; and means for focusing said x-radiation into a beam directed toward on said gap in a direction perpendicular to the first and second directions.
Claim 43
Dependent Claim 31 words
An apparatus as in claim 37 wherein said moving means is also coupled to said focusing means and maintains said focusing means in a predetermined orientation with respect to said gap.
Claim 44
Dependent Claim 53 words
An apparatus as in claim 36 wherein: said fixing means comprises means for defining a chamber; said medium means comprises a pressurized fluid; and said apparatus further includes means for selecting the drift velocity v drift of said carriers, said drift velocity selecting means including means for adjusting the pressure of said fluid.
Claim 45
Dependent Claim 45 words
An apparatus as in claim 39 wherein: said charge-carrier-displacing means comprises means for producing an electric field between said first and second conducting means; and said drift-velocity-selecting means further includes means, operatively connected to said electric-field-producing means, for adjusting the intensity of said electric field.
Claim 46
Dependent Claim 46 words
An apparatus as in claim 36 wherein: said charge-carrier-displacing means comprises means for producing an electric field between said first and second conducting means; and said apparatus further includes means, operatively connected to said electric-field-producing means, for selecting the drift velocity v drift of said carriers.
Claim 47
Dependent Claim 43 words
An apparatus as in claim 36 wherein: said second conducting means comprises plural respective electrodes each disposed a predetermined distance from said first conducting means; and said detecting means comprises means for sensing signals induced in said plural electrodes by said charge carriers.
Claim 48
Dependent Claim 25 words
An apparatus as in claim 42 wherein said sensing means comprises means for sensing the currents flowing in said plural electrodes with respect to time.
Claim 49
Dependent Claim 98 words
An apparatus as in claim 43 wherein: said plural electrodes are arranged in a linear array along a first coordinate axis; and said apparatus further includes: means, operatively connected to said currents sensing means, for determining the spatial distribution of said radiation along said first coordinate axis in response to the relative amplitudes of said sensed currents, and means, operatively connected to said currents sensing means, for determining the spatial distribution of said radiation along a second coordinate axis perpendicular to said first coordinate axis in response to the amplitudes of said sensed currents with respect to time.
Claim 50
Dependent Claim 41 words
An apparatus as in claim 44 wherein said second coordinate axis spatial-distribution-determining means includes means for sampling said sensed currents at a predetermined sampling rate corresponding in duration to the length of a desired resolution element along said second coordinate axis.
Claim 51
Dependent Claim 34 words
An apparatus as in claim 36 wherein said moving means comprises means for rotating said fixing means at a constant velocity v scan along a circle having a center at said radiation source means.
Claim 52
Dependent Claim 26 words
An apparatus as in claim 36 wherein said charge-carrier-displacing means comprises means for producing a uniform constant electric field between said first and second conducting means.
Claim 53
Dependent Claim 81 words
An apparatus as in claim 47 wherein: said fixing means comprises an enclosure including first and second opposing walls and a third wall attached to said first and second walls, said first conducting means disposed on said first wall, said second conducting means disposed on said second wall; and said apparatus further comprises means, disposed on a first surface of said third wall within said enclosure, for correcting distortions in said electric field in proximity to said third wall first surface.
Claim 54
Dependent Claim 48 words
An apparatus as in claim 48 wherein said correcting means comprises third electrical conducting means, disposed on said third wall first surface and electrically connected between said first and second conducting means, for forcing a constant potential gradient to exist in proximity to said third wall first surface.
Claim 55
Dependent Claim 17 words
An apparatus as in claim 49 wherein said third conducting means comprises a sheet of resistive material.
Claim 56
Dependent Claim 66 words
An apparatus as in claim 49 wherein said third conducting means comprises: plural respective electrically conductive strips each disposed on said third wall first surface parallel to at least one of said first and second conducting means; voltage-dividing means, electrically connected between said first and second conducting means, for producing plural voltage levels; and means for applying said plural voltage levels to said respective conductive strips.
Claim 57
Dependent Claim 42 words
An apparatus as in claim 36 wherein: said first conducting means comprises a first plate including means for defining a curved surface thereon; and said second conducting means comprises at least a second plate defining a surface substantially opposing said curved surface.
Claim 58
Dependent Claim 32 words
An apparatus as in claim 36 further including means for selectively changing the mobility of only one of the positive charge carriers and the negative charge carriers produced in said medium means.
Claim 59
Independent Claim 336 words
An apparatus for detecting the spatial distribution and intensity of ionizing radiation, comprising: means for defining a chamber, said chamber-defining means including window means for admitting ionizing radiation into the chamber along at least a first path; medium means, disposed in said chamber, for ionizing in response to said admitted radiation to produce plural charge carrier pairs, each of said charge carrier pairs comprising a positive charge carrier and a negative charge carrier; a first electrically-conductive electrode disposed within said chamber, said first electrode including means for defining a first substantially planar surface contacting said medium means; plural respective electrically-conductive collection electrodes disposed in said chamber, each of said plural collection electrodes including means for defining a substantially planar surface contacting said medium means, said planar surfaces defined by said plural collection electrodes contained in a common plane disposed a fixed distance from said first surface; means, electrically connected to said first electrode and to each of said plural collection electrodes, for producing a substantially constant, uniform electric field between said first electrode first surface and said plane, the direction of said electric field being substantially perpendicular to the path of said radiation, the electric field causing one of the positive and negative charge carriers of each of said charge carrier pairs to drift in a first direction toward said plane at a substantially constant drift velocity v drift ; chamber moving means, mechanically coupled to said chamber, for moving said chamber in a second direction opposite to said first direction at a constant velocity v scan having a magnitude substantially equal to the magnitude of v drift ; current sensing means for sensing the current flowing in said plural collection electrodes resulting from charges produced on said collection electrodes by said charge carriers; and signal processing means, connected to said current sensing means, for determining the spatial resolution in two dimensions of said radiation admitted into said chamber in response to the amplitude with respect to time of current sensed by said current sensing means.
Claim 60
Independent Claim 336 words
An apparatus for detecting the spatial distribution and intensity of ionizing radiation, comprising: means for defining a chamber, said chamber-defining means including window means for admitting ionizing radiation into the chamber along at least a first path; medium means, disposed in said chamber, for ionizing in response to said admitted radiation to produce plural charge carrier pairs, each of said charge carrier pairs comprising a positive charge carrier and a negative charge carrier; a first electrically-conductive electrode disposed within said chamber, said first electrode including means for defining a first substantially planar surface contacting said medium means; plural respective electrically-conductive collection electrodes disposed in said chamber, each of said plural collection electrodes including means for defining a substantially planar surface contacting said medium means, said planar surfaces defined by said plural collection electrodes contained in a common plane disposed a fixed distance from said first surface; means, electrically connected to said first electrode and to each of said plural collection electrodes, for producing a substantially constant, uniform electric field between said first electrode first surface and said plane, the direction of said electric field being substantially perpendicular to the path of said radiation, the electric field causing one of the positive and negative charge carriers of each of said charge carrier pairs to drift in a first direction toward said plane at a substantially constant drift velocity v drift ; chamber moving means, mechanically coupled to said chamber, for moving said chamber in a second direction opposite to said first direction at a constant velocity v scan having a magnitude substantially equal to the magnitude of v drift ; current sensing means for sensing the current flowing in said plural collection electrodes resulting from charges produced on said collection electrodes by said charge carriers; and signal processing means, connected to said current sensing means, for determining the spatial resolution in two dimensions of said radiation admitted into said chamber in response to the amplitude with respect to time of current sensed by said current sensing means.
Claim 61
Dependent Claim 49 words
An apparatus as in claim 54 further including: radiation source means for continuously producing ionizing radiation; collimating means for collimating said radiation into a beam; and means operatively coupled to said collimating means for directing said beam perpendicular to the direction of said electric field toward said window means.
Claim 62
Dependent Claim 34 words
An apparatus as in claim 55 wherein said chamber moving means comprises means for translating said chamber at a constant velocity v scan along a circle having a center at said radiation source means.
Claim 63
Dependent Claim 118 words
An apparatus as in claim 54 wherein: said plural collection electrodes are arranged in a substantially linear array along a first coordinate axis; said signal processing means includes: means for determining the spatial distribution of said radiation along said first coordinate axis in response to the relative amplitudes of said sensed currents, and means for determining the spatial distribution of said radiation along a second coordinate axis perpendicular to said first coordinate axis in response to the amplitudes of said sensed currents with respect to time; and said current sensing means includes means for sampling said currents at a predetermined sampling rate corresponding in duration to the length along said second coordinate axis of a desired resolution element.
Claim 64
Dependent Claim 34 words
An apparatus as in claim 54 further including means, disposed on a first surface of said window means within said chamber, for correcting distortions in said electric field in proximity to said window means.
Claim 65
Independent Claim 78 words
A method of detecting propagating energy comprising the steps of: (1) defining a space upon which propagating energy is incident; (2) producing secondary energy in a medium within said space by interacting said medium with propagating energy incident thereon; (3) non-randomly changing the position of said secondary energy relative to said medium; (4) changing the position of said space synchronously with the change in position of said secondary energy; and (5) detecting the secondary energy in said space.
Claim 66
Independent Claim 78 words
A method of detecting propagating energy comprising the steps of: (1) defining a space upon which propagating energy is incident; (2) producing secondary energy in a medium within said space by interacting said medium with propagating energy incident thereon; (3) non-randomly changing the position of said secondary energy relative to said medium; (4) changing the position of said space synchronously with the change in position of said secondary energy; and (5) detecting the secondary energy in said space.
Claim 67
Dependent Claim 55 words
A method as in claim 59 wherein said position changing step (3) includes the step of moving said space in a direction opposite to the direction of motion of said secondary energy with respect to said medium at a velocity equal in magnitude to the velocity of said secondary energy with respect to said medium.
Claim 68
Dependent Claim 31 words
A method as in claim 59 wherein: and secondary energy includes charge carriers; and said position changing step (2) comprises the step of producing a uniform electric field within said space.
Claim 69
Dependent Claim 65 words
A method as in claim 61 wherein: said electric field produced by said electric field producing step induces said charge carriers to drift through said space at a first substantially constant velocity in a first substantially constant direction; and said position changing step (3) comprises the step of displacing said spacing-defining means at said first velocity in a second direction opposite to said first direction.
Claim 70
Dependent Claim 32 words
A method as in claim 62 further comprising the step of directing said incident energy perpendicularly to said first and second directions into said medium to create charge carriers in said medium.
Claim 71
Dependent Claim 30 words
A method as in claim 63 wherein said electric field producing step comprises the step of producing an electric field having a direction parallel to said first and second directions.
Claim 72
Dependent Claim 35 words
A method as in claim 59 wherein said energy position changing step (2) comprises the step of inducing said secondary energy to drift through said space at a constant drift velocity in a predetermined direction.
Claim 73
Dependent Claim 26 words
A method as in claim 59 wherein said detecting step (4) includes the step of detecting secondary energy within a collection volume defined within said space.
Claim 74
Dependent Claim 40 words
A method as in claim 59 wherein said detecting step (4) includes the steps of: detecting the position of secondary energy within a collection volume defined in said space; and detecting the time said secondary energy enters said collection volume.
Claim 75
Dependent Claim 82 words
A method as in claim 67 wherein: said energy position detecting step comprises the step of sensing the position of said secondary energy within said collection volume along a first coordinate axis; and said method further includes the steps of: (a) creating secondary energy in said space, and (b) determining the position of creation of secondary energy in said space along a second coordinate axis perpendicular to said first coordinate axis in response to the time detected by said time detecting step.
Claim 76
Independent Claim 78 words
A method of detecting radiation comprising the steps of: (1) producing at least one charge carrier in a medium in response to radiation incident to the medium; (2) non-randomly changing the position of said charge carrier relative to said medium in a first direction; (3) changing the position of said medium synchronously with the change in position of said charge carrier in a second direction opposite to the first direction; and (4) detecting charge carriers in said medium.
Claim 77
Independent Claim 78 words
A method of detecting radiation comprising the steps of: (1) producing at least one charge carrier in a medium in response to radiation incident to the medium; (2) non-randomly changing the position of said charge carrier relative to said medium in a first direction; (3) changing the position of said medium synchronously with the change in position of said charge carrier in a second direction opposite to the first direction; and (4) detecting charge carriers in said medium.
Claim 78
Dependent Claim 46 words
A method as in claim 69 wherein said medium position changing step (3) comprises the step of moving said medium in a direction opposite to the direction of motion of said charge carrier at a velocity equal in magnitude to the velocity of said charge carrier.
Claim 79
Dependent Claim 26 words
A method as in claim 69 wherein said charge carrier position changing step (2) includes the step of producing a uniform electric field within said medium.
Claim 80
Dependent Claim 63 words
A method as in claim 71 wherein: said electric field produced by said electric field producing step induces said charge carrier to drift through said medium at a first substantially constant velocity in the first direction; and said medium position changing step (3) comprises the step of displacing said medium at a first velocity in the second direction opposite to said first direction.
Claim 81
Dependent Claim 28 words
A method as in claim 72 further comprising the step of directing said incident radiation toward said medium in a direction perpendicular to said first and second directions.
Claim 82
Dependent Claim 27 words
A method as in claim 72 wherein said electric field produced by said field producing step is in a direction parallel to said first and second directions.
Claim 83
Dependent Claim 36 words
A method as in claim 69 wherein said charge carrier position changing step (2) includes the step of inducing said charge carriers to drift through said medium at a constant drift velocity in a predetermined direction.
Claim 84
Dependent Claim 26 words
A method as in claim 69 wherein said detecting step (4) comprises the step of detecting particles within a collection volume defined adjacent to said medium.
Claim 85
Dependent Claim 41 words
A method as in claim 69 wherein said detecting step (4) comprises the steps of: detecting the position of charge carriers within a collection volume defined adjacent to said medium; and detecting the time said charge carriers enter said collection volume.
Claim 86
Dependent Claim 75 words
A method as in claim 77 wherein: said charge carrier position detecting step comprises the step of sensing the position of charge carriers within said collection volume along a first coordinate axis; and said method further includes the step of determining the position in said medium along a second coordinate axis perpendicular to said first coordinate axis at which said charge carrier was produced in response to the time detected by said time detecting step.
Claim 87
Independent Claim 79 words
A method of storing information comprising the steps of: (1) selectively producing charge carriers in a medium with a charge carrier producing means; (2) preventing said charge carriers produced by said producing step (1) from recombining by biasing said charge carriers to move in a first direction; (3) displacing said medium relative to said charge carrier producing means in a second direction opposite to the first direction; and (4) detecting charge carrier within a predetermined portion of said medium.
Claim 88
Independent Claim 79 words
A method of storing information comprising the steps of: (1) selectively producing charge carriers in a medium with a charge carrier producing means; (2) preventing said charge carriers produced by said producing step (1) from recombining by biasing said charge carriers to move in a first direction; (3) displacing said medium relative to said charge carrier producing means in a second direction opposite to the first direction; and (4) detecting charge carrier within a predetermined portion of said medium.
Claim 89
Dependent Claim 28 words
A method as in claim 79 wherein said recombining preventing step (2) comprises the step of non-randomly changing the position of said charge carriers relative to said medium.
Claim 90
Dependent Claim 29 words
A method as in claim 79 wherein said charge carriers producing step (1) comprises the steps of: producing ionizing radiation; and selectively directing said ionizing radiation into said medium.
Claim 91
Independent Claim 70 words
A method of integrating charge comprising the steps of: (1) continuously directing radiation along a path passing through a medium; (2) producing secondary energy in said medium in proximity to said path in response to said radiation; (3) maintaining said secondary energy in proximity to said path and preventing said secondary energy from recombining with said medium; and (4) measuring the amount of secondary energy in proximity to said path.
Claim 92
Independent Claim 70 words
A method of integrating charge comprising the steps of: (1) continuously directing radiation along a path passing through a medium; (2) producing secondary energy in said medium in proximity to said path in response to said radiation; (3) maintaining said secondary energy in proximity to said path and preventing said secondary energy from recombining with said medium; and (4) measuring the amount of secondary energy in proximity to said path.
Claim 93
Dependent Claim 44 words
A method as in claim 82 wherein said maintaining step (3) includes the steps of: displacing said secondary energy relative to said medium; and displacing said medium relative to said path synchronously with the displacement of secondary energy performed by said energy displacing step.
Claim 94
Dependent Claim 33 words
A method as in claim 83 wherein said energy displacing step comprises the step of inducing said secondary energy to drift through said medium at a constant drift velocity in a predetermined direction.
Claim 95
Dependent Claim 29 words
A method as in claim 83 wherein: said secondary energy includes ions; and said energy displacing step includes the step of producing a uniform electric field through said medium.
Claim 96
Dependent Claim 62 words
A method as in claim 85 wherein: said electric field produced by said electric field producing step induces said ions to drift through said medium at a first substantially constant velocity in a first substantially constant direction; and said medium displacing step comprises the step of displacing said medium at said first velocity in a second direction opposite to said first direction.
Claim 97
Dependent Claim 30 words
A method as in claim 86 wherein said electric field producing step comprises the step of producing an electric field having a direction parallel to said first and second directions.
Claim 98
Dependent Claim 17 words
A method as in claim 86 wherein said path is perpendicular to said first and second directions.
Claim 99
Dependent Claim 32 words
A method as in claim 86 wherein said radiation directing step (1) includes the steps of: producing x-radiation; and focusing said x-radiation into a beam perpendicular to said first and second directions.
Claim 100
Dependent Claim 67 words
A method as in claim 82 wherein: said radiating directing step (1) includes the step of selectively directing radiation along a plurality of parallel paths passing through said medium to produce secondary energy in proximity to each said paths; and said maintaining step (3) includes the step of maintaining secondary energy produced in proximity to each of said plurality of paths in proximity to each said paths.
Claim 101
Dependent Claim 28 words
A method as in claim 82 wherein said measuring step (4) comprises the step of measuring the secondary energy within a collection volume defined adjacent to said medium.
Claim 102
Dependent Claim 36 words
A method as in claim 91 wherein said measuring step (4) includes the steps of: detecting the position of secondary energy within said collection volume; and detecting the time said secondary energy enters said collection volume.
Claim 103
Dependent Claim 78 words
A method as in claim 92 wherein: said energy position-detecting step comprises the step of sensing the position of secondary energy in said collection volume along a first coordinate axis; and said method further includes the step of determining the position in said medium along a second coordinate axis perpendicular to said first coordinate axis at which secondary energy was produced by said energy producing step (2) in response to the time detected by said time detecting step.
Claim 104
Independent Claim 162 words
A method of detecting the spatial distribution and intensity of radiation, comprising: (1) producing ionizing radiation at a radiation source; (2) directing said ionizing radiation produced by said producing step (1) into a gap defined between a first means for conducting electrical current and a second means for conducting electrical current, said first and second conducting means fixed in position with respect to one another; (3) ionizing a medium disposed within said gap in response to said radiation directed by said radiation directing step (2) to produce charge carriers in said gap; (4) inducing the charge carriers produced by said ionizing step (3) to drift at a velocity v drift in a first direction; (5) moving said medium relative to said source in a second direction opposite to said first direction at a velocity v scan having a magnitude substantially equal to the magnitude of the velocity v drift of said drifting charge carriers; and (6) detecting charge carriers in said gap.
Claim 105
Independent Claim 162 words
A method of detecting the spatial distribution and intensity of radiation, comprising: (1) producing ionizing radiation at a radiation source; (2) directing said ionizing radiation produced by said producing step (1) into a gap defined between a first means for conducting electrical current and a second means for conducting electrical current, said first and second conducting means fixed in position with respect to one another; (3) ionizing a medium disposed within said gap in response to said radiation directed by said radiation directing step (2) to produce charge carriers in said gap; (4) inducing the charge carriers produced by said ionizing step (3) to drift at a velocity v drift in a first direction; (5) moving said medium relative to said source in a second direction opposite to said first direction at a velocity v scan having a magnitude substantially equal to the magnitude of the velocity v drift of said drifting charge carriers; and (6) detecting charge carriers in said gap.
Claim 106
Dependent Claim 40 words
A method as in claim 94 wherein said radiation directing step (2) comprises the step of focusing, with a focusing means, said radiation into a beam aimed toward said gap in a direction perpendicular to said first and second directions.
Claim 107
Dependent Claim 28 words
A method as in claim 95 wherein said moving step (5) includes the step of maintaining said focusing means in a predetermined orientation with respect to said gap.
Claim 108
Dependent Claim 46 words
A method as in claim 94 wherein: said medium comprises a pressurized fluid; and said method further includes the step of selecting the drift velocity v drift of said charge carriers, said drift velocity selecting step including the step of adjusting the pressure of said fluid.
Claim 109
Dependent Claim 47 words
A method as in claim 97 wherein: said charge carrier drift inducing step (4) includes the step of producing an electric field between said first and second conducting means; and said drift velocity selecting step further includes the step of adjusting the intensity of said electric field.
Claim 110
Dependent Claim 60 words
A method as in claim 94 wherein: said charge carrier drift inducing step includes the step of producing an electric field between said first and second conducting means; and said method further includes the step of selecting the drift velocity v drift of said charge carriers, said selecting step including the step of adjusting the intensity of said electric field.
Claim 111
Dependent Claim 45 words
A method as in claim 94 wherein: said second conducting means comprises plural respective electrodes each disposed a predetermined distance from said first conducting means; and said detecting step (6) includes the step of sensing signals induced in said plural electrodes by said charge carriers.
Claim 112
Dependent Claim 26 words
A method as in claim 100 wherein said sensing step comprises the step of sensing the currents flowing in said plural electrodes with respect to time.
Claim 113
Dependent Claim 92 words
A method as in claim 101 wherein: said plural electrodes are arranged in a linear array along a first coordinate axis; and said method further includes steps of: determining the spatial distribution of said radiation along said first coordinate axis in response to the relative amplitudes of said currents sensed by said current sensing step; and determining the spatial distribution of said radiation along a second coordinate axis perpendicular to said first coordinate axis in response to the amplitudes of said currents sensed by said current sensing step with respect to time.
Claim 114
Dependent Claim 44 words
A method as in claim 102 wherein said second coordinate axis spatial distribution determining step includes the step of sampling said sensed currents at a predetermined sampling rate corresponding in duration to the length of a desired resolution element along said second coordinate axis.
Claim 115
Dependent Claim 34 words
A method as in claim 94 wherein said moving step (5) rotates said first and second conducting means at a constant velocity v scan along a circle having a center at said radiation source.
Claim 116
Dependent Claim 31 words
A method as in claim 94 wherein said charge carrier drift inducing step (4) comprises the step of producing a uniform constant electric field between said first and second conducting means.
Claim 117
Dependent Claim 64 words
A method as in claim 105 wherein: said first and second conducting means are disposed on first and second walls, respectively, of an enclosure, said enclosure including a third wall attached to said first and second walls; and said method further comprises the step of correcting distortions in said electric field in proximity to a first surface of said third wall within said enclosure.
Claim 118
Dependent Claim 29 words
A method as in claim 106 wherein said correcting step includes the step of forcing a constant potential gradient to exist in proximity to said third wall first surface.
Claim 119
Dependent Claim 30 words
A method as in claim 107 wherein said forcing step comprises the step of applying electrical potential to a sheet of resistive material disposed on said third wall first surface.
Claim 120
Dependent Claim 48 words
A method as in claim 107 wherein said forcing step comprises the steps of: producing plural voltage levels; and applying said plural voltage levels to plural electrically conductive strips disposed on said third wall first surface parallel to at least one of said first and second conducting means.
Claim 121
Dependent Claim 32 words
A method as in claim 94 further including the step of selectively changing the mobility of only one of the positive charge carriers and the negative charge carriers produced in said medium.
Claim 122
Independent Claim 282 words
A method of detecting the spatial distribution and intensity of ionizing radiation, comprising the steps of: (1) admitting ionizing radiation into a chamber along at least a first path via a window defined in the chamber; (2) ionizing a medium disposed within said chamber in response to said radiation admitted by said radiation admitting step (1) to produce plural charge carrier pairs, each of said charge carriers pairs comprising a positive charge carrier and a negative charge carrier; (3) producing a substantially uniform, constant electric field between a first substantially planar surface contacting said medium, said first surface defined by an electrically conductive electrode disposed with said chamber, and a plane containing planar surfaces defined by plural respective electrically conductive collection electrodes disposed in said chamber, said planar surfaces contacting said medium, said plane disposed a fixed distance from said first electrode, the direction of said electric field being substantially perpendicular to the path of said radiation, said electric field causing one of the positive and negative charge carriers of each of said charge carrier pairs to drift in a first direction toward said plane at a substantially constant drift velocity v drift ; (4) moving said chamber in a second direction opposite to said first direction at a constant velocity v scan having a magnitude substantially equal to the magnitude of v drift ; (5) sensing the currents flowing in said plural collection electrodes resulting from charges produced on said collection electrodes by said charge carriers; and (6) determining the spatial distribution in two dimensions of said radiation admitted into said chamber in response to the amplitude with respect to time of the currents sensed by said currents sensing step (5).
Claim 123
Independent Claim 282 words
A method of detecting the spatial distribution and intensity of ionizing radiation, comprising the steps of: (1) admitting ionizing radiation into a chamber along at least a first path via a window defined in the chamber; (2) ionizing a medium disposed within said chamber in response to said radiation admitted by said radiation admitting step (1) to produce plural charge carrier pairs, each of said charge carriers pairs comprising a positive charge carrier and a negative charge carrier; (3) producing a substantially uniform, constant electric field between a first substantially planar surface contacting said medium, said first surface defined by an electrically conductive electrode disposed with said chamber, and a plane containing planar surfaces defined by plural respective electrically conductive collection electrodes disposed in said chamber, said planar surfaces contacting said medium, said plane disposed a fixed distance from said first electrode, the direction of said electric field being substantially perpendicular to the path of said radiation, said electric field causing one of the positive and negative charge carriers of each of said charge carrier pairs to drift in a first direction toward said plane at a substantially constant drift velocity v drift ; (4) moving said chamber in a second direction opposite to said first direction at a constant velocity v scan having a magnitude substantially equal to the magnitude of v drift ; (5) sensing the currents flowing in said plural collection electrodes resulting from charges produced on said collection electrodes by said charge carriers; and (6) determining the spatial distribution in two dimensions of said radiation admitted into said chamber in response to the amplitude with respect to time of the currents sensed by said currents sensing step (5).
Claim 124
Dependent Claim 46 words
A method as in claim 111 further including the steps of: continuously producing ionizing radiation at a radiation source; collimating said radiation produced by said radiation producing step into a beam; and directing said beam perpendicular to the direction of said electric field toward said window.
Claim 125
Dependent Claim 35 words
A method as in claim 112 wherein said chamber moving means (4) comprises the step of translating said chamber at a constant velocity v scan along a circle having a center at said radiation source.
Claim 126
Dependent Claim 133 words
A method as in claim 111 wherein: said plural collection electrodes are arranged in a substantially linear array along a first coordinate axis; said spatial distribution determining step (6) comprises the steps of: determining the spatial distribution of said radiation along said first coordinate axis in response to the relative amplitudes of the currents sensed by said currents sensing step (5), and determining the spatial distribution of said radiation along a second coordinate axis perpendicular to said first coordinate axis in response to the amplitudes of said currents sensed by said currents sensing step (5) with respect to time; and said currents sensing step (5) includes the step of sampling said currents at a predetermined sampling rate corresponding in duration to the length along said second coordinate axis of a desired resolution element.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-11-16 1991-05-18 1991-11-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-11-16 1995-05-18 1995-11-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-11-16 1999-05-18 1999-11-17 $7700.00 Window Closed / Lapsed

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