Patent US3707091A successfully refreshed from Google Patents.
US3707091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual pick-off electronic circuitry for linear servo accelerometer
Assignee: NEW SD Inc A CORP OF
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Filing: 1970-06-18
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Granted: 1972-12-26
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Expires: 1990-06-18
Abstract
Abstract Dual pick-off electronic circuitry for linear servo accelerometer of the type having an unbalanced mass in the form of a conducting element. First and second pick-off coils disposed on opposite sides of the conducting element. First and second oscillators are connected to the first and second pick-off coils in such a manner that the first pick-off coil forms a part of the tank circuit of the first oscillator and the second pick-off coil forms a part of the tank circuit of the second oscillator. Means is provided for interconnecting the first and second oscillators so that the first and second oscillators operate in synchronism at substantially identical frequencies. Means is provided for rectifying the outputs of the first and second oscillators and a differential amplifier having dual input and dual output is utilized for receiving the rectified signals. A.C. feedback means is provided for controlling the open loop gain and also for providing temperature stabilization. Means is provided for converting the double ended output of the differential amplifier to a single ended output for driving a torque coil which is connected to the conducting element to oppose the forces of acceleration on the conducting element.
Inventors
- 👤 Harold D Morris
- 👤 Andrew B Barlak Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/13; G01P15/132
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
182 words
In an accelerometer, an unbalanced mass in the form of a planar conducting element which is free to move under the forces of acceleration, first and second pick-off coils disposed on opposite sides of said planar conducting element in relatively close proximity thereto, a first oscillator coupled to said first pick-off coil in such a manner that the pick-off coil forms a part of the tank circuit of the oscillator, a second oscillator coupled to the second pick-off in such a manner that the second pick-off coil forms a part of the tank circuit of the second oscillator, means for electrically coupling said first and second oscillators so that said first and second oscillators operate in synchronism at substantially identical frequencies, first and second rectifiers coupled to the outputs of the first and second oscillators, differential amplifier means coupled to said first and second rectifiers and means connecting the output of the differential amplifier to said torque coil whereby said torque coil is utilized to apply a force to said conducting element to oppose the acceleration forces applied to the conducting element.
Claim 2
Dependent Claim
182 words
In an accelerometer, an unbalanced mass in the form of a planar conducting element which is free to move under the forces of acceleration, first and second pick-off coils disposed on opposite sides of said planar conducting element in relatively close proximity thereto, a first oscillator coupled to said first pick-off coil in such a manner that the pick-off coil forms a part of the tank circuit of the oscillator, a second oscillator coupled to the second pick-off in such a manner that the second pick-off coil forms a part of the tank circuit of the second oscillator, means for electrically coupling said first and second oscillators so that said first and second oscillators operate in synchronism at substantially identical frequencies, first and second rectifiers coupled to the outputs of the first and second oscillators, differential amplifier means coupled to said first and second rectifiers and means connecting the output of the differential amplifier to said torque coil whereby said torque coil is utilized to apply a force to said conducting element to oppose the acceleration forces applied to the conducting element.
Claim 3
Dependent Claim
46 words
An accelerometer as in claim 1 wherein said differential amplifier has a dual input and a dual output together with feedback means interconnecting said dual outputs to said first and second oscillators to control the open loop gain of the differential amplifier combineD with the oscillator.
Claim 4
Dependent Claim
14 words
An accelerometer as in claim 2 wherein said feedback means includes temperature stabilization means.
Claim 5
Dependent Claim
37 words
An accelerometer as in claim 1 wherein said means coupling the torque coil to the differential amplifier includes an operational amplifier having two inputs for converting the dual output from the differential amplifier to a single-ended output.
Claim 6
Dependent Claim
31 words
An accelerometer as in claim 4 together with a resistive network connected between the operational amplifier and the differential amplifier to null out the common mode signal from the differential amplifier.
Claim 7
Dependent Claim
41 words
An accelerometer as in claim 4 together with additional amplifier means for amplifying the output from the operational amplifier and a gain resistive network connected between the output of the output amplifier and one of the inputs to the operational amplifier.
Claim 8
Dependent Claim
19 words
An accelerometer as in claim 1 wherein said means electrically coupling, said first and second oscillators includes resistance means.
Claim 9
Dependent Claim
29 words
An accelerometer as in claim 1 wherein said means electrically coupling said first and second oscillators includes means for cross coupling said first and second oscillators to each other.
Claim 10
Dependent Claim
79 words
An accelerometer as in claim 8 wherein each of said oscillators includes a tank circuit and a transistor having an input terminal and wherein said means for cross coupling includes means for connecting the output of the tank circuit of the first oscillator to the input terminal of the transistor of the second oscillator and means for connecting the output of the tank circuit of the second oscillator to the input terminal of the transistor of the first oscillator.
Claim 11
Dependent Claim
169 words
In electronic circuitry for use with an accelerometer of the type having unbalanced mass in the form of a conducting element adapted to be subjected to acceleration forces, first and second pick-off coils adapted to be disposed on opposite sides of the conducting element, first and second oscillators coupled to said first and second pick-off coils so that said first pick-off forms a part of the tank circuit of the first oscillator and the second pick-off coil forms a part of the tank circuit of the second oscillator, means electrically coupling said first and second oscillators so that they operate in synchronism at substantially identical frequencies, first and second rectifiers for rectifying the outputs of said first and second oscillators, differential amplifier means for receiving the outputs from the rectifiers, a torque coil connected to said conducting element and means connecting the output of the differential amplifier to said torque coil whereby said torque coil is used to generate forces to oppose the acceleration forces to said conducting element.
Claim 12
Dependent Claim
169 words
In electronic circuitry for use with an accelerometer of the type having unbalanced mass in the form of a conducting element adapted to be subjected to acceleration forces, first and second pick-off coils adapted to be disposed on opposite sides of the conducting element, first and second oscillators coupled to said first and second pick-off coils so that said first pick-off forms a part of the tank circuit of the first oscillator and the second pick-off coil forms a part of the tank circuit of the second oscillator, means electrically coupling said first and second oscillators so that they operate in synchronism at substantially identical frequencies, first and second rectifiers for rectifying the outputs of said first and second oscillators, differential amplifier means for receiving the outputs from the rectifiers, a torque coil connected to said conducting element and means connecting the output of the differential amplifier to said torque coil whereby said torque coil is used to generate forces to oppose the acceleration forces to said conducting element.
Claim 13
Dependent Claim
53 words
Electronic circuitry as in claim 10 wherein said differential amplifier has a dual input and a dual output and wherein said means for connecting the output of the differential amplifier to the torque coil includes means for converting the dual output of the differential amplifier to a single-ended output for the torque coil.
Claim 14
Dependent Claim
25 words
Electronic circuitry as in claim 11 together with feedback means connected to the outputs of the differential amplifier and to the first and second oscillators.
Claim 15
Dependent Claim
32 words
Electronic circuitry as in claim 12 wherein the tank circuit of each of said oscillators includes a transistor and wherein the feedback means is connected to the input terminals of the transistors.
References Cited (Backward Citations)
US2939072A
Cited
US3461400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |