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US4990772A
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Apparatus and method for calibrating a near-infrared interactance probe
Assignee: Futrex Inc
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Filing: 1990-04-11
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Granted: 1991-02-05
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Expires: 2010-04-11
Abstract
Abstract A probe for near-infrared interactance quantitative analysis is calibrated by placing the near-infrared source and detector within a cavity of a calibrating sleeve. The cavity provides a reflectance value that corresponds to an interactance calibration value for which the probe is being calibrated.
Inventors
- 👤 Robert D. Rosenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:25
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/48; A61B5/4869; A61B5/4872; A61B5/0059; A61B2560/00; A61B2560/02; A61B2560/0223; A61B2560/0228; A61B2560/0233
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
An apparatus for calibrating a probe for near-infrared interactance quantitative analysis, the calibrating apparatus comprising a near-infrared-opaque body, means defining a cavity in the body having a bottom portion with a predetermined geometrical shape, and means for positioning a near-infrared interactance light probe having a near-infrared source and detector within the cavity of the body with the bottom portion of the cavity spaced away from said source and said detector a distance that provides the bottom portion of the cavity with a reflectance value that corresponds to an interactance calibration value for which the probe is being calibrated, so as to reflect sufficient near-infrared radiation emitted from said source to said detector for calibrating the probe for use in an interactance mode.
Claim 2
Independent Claim
122 words
An apparatus for calibrating a probe for near-infrared interactance quantitative analysis, the calibrating apparatus comprising a near-infrared-opaque body, means defining a cavity in the body having a bottom portion with a predetermined geometrical shape, and means for positioning a near-infrared interactance light probe having a near-infrared source and detector within the cavity of the body with the bottom portion of the cavity spaced away from said source and said detector a distance that provides the bottom portion of the cavity with a reflectance value that corresponds to an interactance calibration value for which the probe is being calibrated, so as to reflect sufficient near-infrared radiation emitted from said source to said detector for calibrating the probe for use in an interactance mode.
Claim 3
Independent Claim
129 words
A method for calibrating a near-infrared interactance probe for quantitative analysis of a material, comprising: (a) providing a near-infrared-opaque body having a cavity therein with a bottom portion having a predetermined geometrical shape; (b) positioning a near-infrared interactance probe, having a near-infrared source and detector, within the cavity of the body with the bottom portion of the cavity spaced away from said source and said detector a distance that provides the bottom portion of the cavity with a reflectance value that corresponds to an interactance calibration value for which the probe is being calibrated, so as to reflect sufficient near-infrared radiation emitted from such source to said detector for calibrating the probe for use in an interactance mode; and (c) calibrating the probe while positioned as in step (b).
Claim 4
Independent Claim
129 words
A method for calibrating a near-infrared interactance probe for quantitative analysis of a material, comprising: (a) providing a near-infrared-opaque body having a cavity therein with a bottom portion having a predetermined geometrical shape; (b) positioning a near-infrared interactance probe, having a near-infrared source and detector, within the cavity of the body with the bottom portion of the cavity spaced away from said source and said detector a distance that provides the bottom portion of the cavity with a reflectance value that corresponds to an interactance calibration value for which the probe is being calibrated, so as to reflect sufficient near-infrared radiation emitted from such source to said detector for calibrating the probe for use in an interactance mode; and (c) calibrating the probe while positioned as in step (b).
References Cited (Backward Citations)
GB823832A
Cited
US4801804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |