US3626247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angular velocity measurement apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1969-07-03
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Granted: 1971-12-07
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Expires: 1989-07-03
Abstract
Abstract A system for measuring extremely slow angular velocities including both a DC tachometer and an optical encoder. The encoder output is converted into an average velocity indicating analog signal that is combined with the transient components of the tachometer output. The resultant control signal possesses both the average velocity indicating accuracy of the encoder and the instantaneous response of the tachometer.
Inventors
- 👤 Edward P Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:15
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
Angular velocity measurement apparatus comprising a velocity responsive transducer means for producing a first output signal indicating the instantaneous angular velocity of a mechanism, a position responsive transducer means for producing a second output signal indicating incremental angular positions of the mechanism, and combining circuit means for combining said first and second output signals so as to produce a control signal having a value dependent upon both the average angular velocity of the mechanism as indicated by said second output signal and instantaneous changes in its angular velocity indicated by transients in said first output signal.
Claim 2
Dependent Claim
96 words
Angular velocity measurement apparatus comprising a velocity responsive transducer means for producing a first output signal indicating the instantaneous angular velocity of a mechanism, a position responsive transducer means for producing a second output signal indicating incremental angular positions of the mechanism, and combining circuit means for combining said first and second output signals so as to produce a control signal having a value dependent upon both the average angular velocity of the mechanism as indicated by said second output signal and instantaneous changes in its angular velocity indicated by transients in said first output signal.
Claim 3
Dependent Claim
26 words
Angular velocity measurement apparatus according to claim 1 wherein said combining circuit comprises filter circuit means for extracting the transient components from said first output signal.
Claim 4
Dependent Claim
44 words
Angular velocity measurement apparatus according to claim 1 wherein said position responsive transducer means produces a pulsed output indicative of said incremental angular positions and said combining circuit means comprises converter circuit means for converting said pulses output into an angular velocity proportional signal.
Claim 5
Dependent Claim
28 words
Angular velocity measurement apparatus according to claim 3 wherein said converter circuit means comprises counter means for counting during given time periods the pulses in said pulsed output.
Claim 6
Dependent Claim
34 words
Angular velocity measurement apparatus according to claim 4 wherein said filter circuit means is a high-pass filter circuit connected to receive said first output signal aNd adapted to pass only the transient components thereof.
Claim 7
Dependent Claim
32 words
Angular velocity measurement apparatus according to claim 5 wherein said combining circuit is adapted to produce said control output signal by algebraically summing said velocity proportional output signal and said transient components.
Claim 8
Dependent Claim
27 words
Angular velocity measurement apparatus according to claim 6 wherein said velocity responsive transducer means comprises a tachometer, and said position responsive transducer means comprises an optical encoder.
Claim 9
Dependent Claim
69 words
Angular velocity measurement apparatus according to claim 4 wherein said filter circuit means is a low-pass filter circuit connected to receive said first output signal and adapted to pass only the steady state component thereof, and said combining circuit includes a comparator that determines the difference between said velocity proportional output signal and said steady state component to produce a correction signal that is combined with said first signal.
Claim 10
Dependent Claim
27 words
Angular velocity measurement apparatus according to claim 8 wherein said velocity responsive transducer means comprises a tachometer, and said position responsive transducer means comprises an optical encoder.
Claim 11
Dependent Claim
97 words
Angular velocity measurement apparatus according to claim 2 wherein said filter circuit means is a low-pass filter circuit connected to pass only the steady state component of said first output signal; and said combining circuit comprises a converter circuit for converting said steady state component into a converted pulsed output, and a comparator for comparing during given time periods said second output signal and said converted pulsed output so as to produce a difference analog signal representing the difference therebetween, and said difference analog signal is combined with said first output signal to produce said control signal.
Claim 12
Dependent Claim
27 words
Angular velocity measurement apparatus according to claim 10 wherein said velocity responsive transducer means comprises a tachometer, and said position responsive transducer means comprises an optical encoder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |