Patent US3741018A successfully refreshed from Google Patents.
US3741018A
Expired / Lapsed
US
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Fluidic angular rate sensor
Assignee: United States Department of the Army
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Filing: 1971-11-23
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Granted: 1973-06-26
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Expires: 1991-11-23
Abstract
Abstract A fluidic angular rate sensor is disclosed comprising a rotatable disc which preferably has a plurality of elongated apertures therethrough of a finite length, the rotatable disc being adapted to be rotated about its axis at a velocity which is proportional to an angular velocity to be measured. A fluid input means or hole having a given discharge area is associated with the rotating disc and serves to sequentially apply a fluid signal into each aperture whereat the signal is entrained while the disc rotates. A fluid collector means having a given collector area is disposed in substantial alignment with the fluid input means and is associated with the rotating disc, the collector sequentially receiving from each aperture a portion of the applied fluid signal. This portion has a value which is proportional to the product of the instantaneous velocity of the fluid signal entrained in the aperture and the instantaneous exposed collector area of the collector means, which collector area varies as the disc rotates. Sensing means are provided to operate upon the received signal so as to derive an output signal which preferably comprises the average of the received signal, the output signal being indicative of the angular velocity of the disc.
Inventors
- 👤 S Katz
- 👤 E Hastie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:45
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/26; G01P3/263; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
213 words
A fluidic angular rate sensor comprising: a rotatable disc element having at least one elongated channel therethrough of a finite length L, said channel defining a fluidic delay line, said disc element being adapted to be rotated about its axis at a velocity proportional to an angular velocity to be measured; fluid input means having a given discharge area associated with said disc element for applying a fluid signal pulse sequentially into each channel whereat said signal pulse is entrained while said disc element rotates, said signal pulse being propagated along said channel at an average propagation velocity Cs; fluid collector means having a given collector area disposed in substantial alignment with said fluid input means and associated with said disc element for sequentially receiving from each channel during rotation of said disc element a portion of the applied fluid signal after a time delay L/Cs, said received signal having a pressure which is proportional to the product of the instantaneous velocity V(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area A(t) of said fluid collector means; and pressure sensing means coupled to said fluid collector means for deriving an output signal from the received signal which is indicative of the angular velocity of said disc element.
Claim 2
Dependent Claim
213 words
A fluidic angular rate sensor comprising: a rotatable disc element having at least one elongated channel therethrough of a finite length L, said channel defining a fluidic delay line, said disc element being adapted to be rotated about its axis at a velocity proportional to an angular velocity to be measured; fluid input means having a given discharge area associated with said disc element for applying a fluid signal pulse sequentially into each channel whereat said signal pulse is entrained while said disc element rotates, said signal pulse being propagated along said channel at an average propagation velocity Cs; fluid collector means having a given collector area disposed in substantial alignment with said fluid input means and associated with said disc element for sequentially receiving from each channel during rotation of said disc element a portion of the applied fluid signal after a time delay L/Cs, said received signal having a pressure which is proportional to the product of the instantaneous velocity V(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area A(t) of said fluid collector means; and pressure sensing means coupled to said fluid collector means for deriving an output signal from the received signal which is indicative of the angular velocity of said disc element.
Claim 3
Dependent Claim
29 words
A fluidic angular rate sensor as defined in claim 1, wherein said output signal from said sensing means has a value which is the average of the received signal.
Claim 4
Dependent Claim
50 words
A fluidic angular rate sensor as defined in claim 1, wherein said elongated channels through said disc element have an axis parallel to the axis of rotation of said disc element, said fluid input means and said fluid collector means being respectively disposed to either side of said disc element.
Claim 5
Dependent Claim
90 words
A fluidic angular rate sensor as defined in claim 1, wherein said elongated channels are disposed through said disc element in a radial direction, said fluid input means and said fluid collector means being disposed along a radial axis of said disc element with one of said fluid input means and said fluid collector means being substantially disposed at the rotational center of said disc element and with the other of said fluid input means and said fluid collector means being disposed at the outer periphery of said disc element.
Claim 6
Dependent Claim
229 words
A fluidic angular rate sensor comprising: a rotatable disc element having at least one elongated channel therethrough of a finite length L, said channel defining a fluidic delay line, said disc element being adapted to be rotated about its axis at a velocity proportional to an angular velocity to be measured; fluid input means having a given discharge area associated with said disc element for applying a fluid signal pulse sequentially into each channel whereat said signal pulse is entrained while said disc element rotates, said signal pulse being propagated along said channel at an average propagation velocity C; fluid collector means having a given collector area disposed in a slightly misaligned relationship with said fluid input means and associated with said disc element for sequentially receiving from each channel during rotation of said disc element a portion of the applied fluid signal after a time delay L/C, said received signal having a pressure which is proportional to the product of the instantaneous velocity V(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area A(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area of said fluid collector means; and pressure sensing means coupled to said fluid collector means for deriving an output signal from the received signal which is indicative of the angular velocity of said disc element.
Claim 7
Dependent Claim
229 words
A fluidic angular rate sensor comprising: a rotatable disc element having at least one elongated channel therethrough of a finite length L, said channel defining a fluidic delay line, said disc element being adapted to be rotated about its axis at a velocity proportional to an angular velocity to be measured; fluid input means having a given discharge area associated with said disc element for applying a fluid signal pulse sequentially into each channel whereat said signal pulse is entrained while said disc element rotates, said signal pulse being propagated along said channel at an average propagation velocity C; fluid collector means having a given collector area disposed in a slightly misaligned relationship with said fluid input means and associated with said disc element for sequentially receiving from each channel during rotation of said disc element a portion of the applied fluid signal after a time delay L/C, said received signal having a pressure which is proportional to the product of the instantaneous velocity V(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area A(t) of the fluid signal entrained in said channel and the instantaneous exposed collector area of said fluid collector means; and pressure sensing means coupled to said fluid collector means for deriving an output signal from the received signal which is indicative of the angular velocity of said disc element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |