Patent US3742767A successfully refreshed from Google Patents.
US3742767A
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US
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Ball electrostatic accelerometer
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1972-01-31
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Granted: 1973-07-03
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Expires: 1992-01-31
Abstract
Abstract An electrostatic accelerometer comprising a ball and casing and having a ball controlling device for each of the three orthogonal axes. Said accelerometer comprises for each axes a differential electric circuit for detecting the position of the ball and an electrostatic circuit for controlling the position of the ball having two pairs of coaxially secured electrodes whose internal surfaces facing the ball are located on the same sphere and are of equal area. With this structure, the cross effect of the electrostatic charge of the ball on the sensitivity of the accelerometer is cancelled.
Inventors
- 👤 A Bernard
- 👤 M Gay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:10
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/13; G01P15/131
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
In a three orthogonal axes elctrostatic accelerometer comprising a ball and casing device and having for each axis a ball position detection circuit connected to detection electrodes and a ball position controlling circuit controlled by said detection circuit and connected to control electrodes, that improvement which is characterized in that in said control electrodes for each pole of each axis there are provided a pair of electrodes having the ball facing internal surfaces which are coaxial with each said axis located on a sphere and which have equal areas and electrical charges of equal amplitude but opposite phase applied thereto to control the position of the ball.
Claim 2
Dependent Claim
107 words
In a three orthogonal axes elctrostatic accelerometer comprising a ball and casing device and having for each axis a ball position detection circuit connected to detection electrodes and a ball position controlling circuit controlled by said detection circuit and connected to control electrodes, that improvement which is characterized in that in said control electrodes for each pole of each axis there are provided a pair of electrodes having the ball facing internal surfaces which are coaxial with each said axis located on a sphere and which have equal areas and electrical charges of equal amplitude but opposite phase applied thereto to control the position of the ball.
Claim 3
Dependent Claim
63 words
Three orthogonal axes electrostatic accelerometer according to claim 1, wherein the two electrodes controlling the position of a pole comprise a first electrode in the form of a spherical cap and a second electrode in the form of a spherical ring, the two electrodes being separated by a position-detecting electrode in the form of a spherical ring, coaxial with the aforementioned position-control electrodes.
Claim 4
Dependent Claim
29 words
Three orthogonal axes electrostatic accelerometer according to claim 1, wherein the position-detecting and position-control electrodes are recessed with respect to the spherical interior of the casing around the ball.
Claim 5
Dependent Claim
32 words
Three orthogonal axes electrostatic accelerometer according to claim 3, wherein the detecting electrodes are, in a lesser degree, recessed than the position-control electrodes with respect to the spherical interior of the casing.
Claim 6
Dependent Claim
93 words
Three orthogonal axes electrostatic accelerometer comprising a ball and casing device and having for each axis a ball position detection circuit connected to detection electrodes and ball position controlling circuit connected to said detection circuit and to control electrodes which generates two voltages of equal amplitude and opposite polarity respectively applied to the two control electrodes of each pole of said axis, said two control electrodes having equal internal areas so that said area receive electrical charges of equal amplitude and opposite polarity, which nullify the effect of the charge of the ball.
Claim 7
Dependent Claim
93 words
Three orthogonal axes electrostatic accelerometer comprising a ball and casing device and having for each axis a ball position detection circuit connected to detection electrodes and ball position controlling circuit connected to said detection circuit and to control electrodes which generates two voltages of equal amplitude and opposite polarity respectively applied to the two control electrodes of each pole of said axis, said two control electrodes having equal internal areas so that said area receive electrical charges of equal amplitude and opposite polarity, which nullify the effect of the charge of the ball.
Claim 8
Dependent Claim
67 words
Three orthogonal axEs electrostatic accelerometer according to claim 5, wherein two pairs of opposite control electrodes are provided for each axis, the electrodes of one pair being energized by two voltages of equal amplitude and opposite polarity when the ball is shifted in one direction and the electrodes of the other pair being energized by two similar voltages when the ball is shifted in the opposite direction.
References Cited (Backward Citations)
US3338644A
Cited
US3438267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |