Patent US4406965A successfully refreshed from Google Patents.
US4406965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dither pick-off transducer for ring laser gyroscope
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1981-05-12
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Granted: 1983-09-27
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Expires: 2001-05-12
Abstract
Abstract A piezoelectric pick-off transducer is used for sensing dither velocity in a ring laser gyroscope. The pick-off transducer is mounted on a spoke connecting the hub and rim of the gyroscope and it comprises two spaced electrodes equidistant about the point of inflection of the spoke. A differential amplifier is connected at its input to the electrodes for generating a signal proportional to dither velocity.
Inventors
- 👤 Bo H. G. Ljung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:52
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/66; G01C19/68; G01C19/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A piezoelectric dither pick-off transducer system for use with a ring laser gyroscope having radial spokes connecting a hub and a rim, the system comprising: a piezoelectric transducer having at least two output leads for push-pull operation and mounted to a spoke at the inflection point thereof; differential means connected at its inputs to the leads for measuring the difference between dither signals at the inputs; and terminals connected to the output of the differential means for measuring a generated dither signal.
Claim 2
Dependent Claim
82 words
A piezoelectric dither pick-off transducer system for use with a ring laser gyroscope having radial spokes connecting a hub and a rim, the system comprising: a piezoelectric transducer having at least two output leads for push-pull operation and mounted to a spoke at the inflection point thereof; differential means connected at its inputs to the leads for measuring the difference between dither signals at the inputs; and terminals connected to the output of the differential means for measuring a generated dither signal.
Claim 3
Dependent Claim
57 words
The system set forth in claim 1 wherein the transducer comprises: an adhesive insulating film for attachment to the spoke; an electrode deposited on a first piezoelectric transducer surface adjacent the spoke; and two coplanar separated electrodes deposited on a second transducer surface, opposite the first surface, the two leads respectively connected to the two separated electrodes.
Claim 4
Dependent Claim
42 words
The system set forth in claim 1 wherein the differential means comprises an operational amplifier having first and second inputs and an output, and means connected between the inputs and output for establishing operation of the operational amplifier as a current-to-voltage converter.
Claim 5
Dependent Claim
56 words
The system set forth in claim 1 wherein the differential means comprises first and second operational amplifiers, each having a first input connected to a respective lead and a second grounded input, each operational amplifier operating as a current-to-voltage converter, and a differential amplifier connected at both inputs thereof to respective outputs of the operational amplifiers.
Claim 6
Dependent Claim
41 words
The system set forth in claim 3 together with: means for grounding the hub; means connecting the first and second inputs of the operational amplifier to respective transducer leads; and means connecting the second input of the operational amplifier to ground.
Claim 7
Dependent Claim
15 words
The system set forth in claim 4 together with means connecting the hub to ground.
Claim 8
Dependent Claim
42 words
The system set forth in claim 2 wherein the differential means comprises an operational amplifier having first and second inputs and an output, and means connected between the inputs and output for establishing operation of the operational amplifier as a current-to-voltage converter.
Claim 9
Dependent Claim
56 words
The system set forth in claim 2 wherein the differential means comprises first and second operational amplifiers, each having a first input connected to a respective lead, and a second grounded input, each operational amplifier operating as a current-to-voltage converter, and a differential amplifier connected at both inputs thereof to respective outputs of the operational amplifiers.
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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) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |