Patent US4777825A successfully refreshed from Google Patents.
US4777825A
Expired / Lapsed
US
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Stabilized reference surface for laser vibration sensors
Assignee: United States Department of the Army
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Filing: 1987-07-15
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Granted: 1988-10-18
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Expires: 2007-07-15
Abstract
Abstract The invention provides a vibration sensor with a platform mounted Bragg c frequency shifter and heterodyne detection system, wherein the reference beam is modulated with the component of platform vibration normal to the sensing beam, such that a similar modulation of the sensing beam is cancelled by the heterodyning process.
Inventors
- 👤 Dallas N. Barr
- 👤 Clifton S. Fox
- 👤 John E. Nettleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
G; G01; G01H; G01H9/00; G01S; G01S7/00; G01S7/48; G01S7/491; G01S7/4912; G01S7/4917; G01S17/00; G01S17/02; G01S17/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
In a laser vibration detection system mounted on an optical platform, and having a narrow output beam, wherein a portion of said output beam is split off as a reference beam and processed within said system as a means of detecting reflections of said output beam from a distant target, the improvement comprising; a dihedral mirror firmly attached to said platform and an inertial reference mirror compliantly mounted on said platform, such that said reference beam is reflected between said mirrors parallel to said output beam.
Claim 2
Dependent Claim
86 words
In a laser vibration detection system mounted on an optical platform, and having a narrow output beam, wherein a portion of said output beam is split off as a reference beam and processed within said system as a means of detecting reflections of said output beam from a distant target, the improvement comprising; a dihedral mirror firmly attached to said platform and an inertial reference mirror compliantly mounted on said platform, such that said reference beam is reflected between said mirrors parallel to said output beam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |