Patent US3854819A successfully refreshed from Google Patents.
US3854819A
Expired / Lapsed
US
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Laser gyroscope
Assignee: Individual
•
Filing: 1972-10-02
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Granted: 1974-12-17
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Expires: 1992-10-02
Abstract
Abstract A laser gyroscope system which detects frequency shifts in which waves are propagated along a path in opposite directions at different frequencies to minimize interaction between the waves with frequency separation of the waves maintained by both reciprocal and nonreciprocable polarization dispersion in which frequencies of the two waves propagating in one direction lie between the two frequencies of waves propagating in the opposite direction. Rotation of the system produces shifts in the frequencies so that variation in the difference between the separation between the two upper frequencies, which propagate in opposite directions, and the separation between the two lower frequencies, which propagate in opposite directions, is used to measure rotation rate.
Inventors
- 👤 K Andringa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/66; G01C19/667; G01P; G01P3/00; G01P3/36; G01P3/366
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
71 words
In combination: means for simultaneously directing a plurality of radiant energy waves having at least a plurality of substantially coherent frequencies in opposite directions through a polarization dispersive medium; means comprising a medium common to at least a portion of the path of each of said waves for amplifying said waves; frequency responsive reflecting filter means in said path; and means for varying said frequencies comprising means for moving said medium.
Claim 2
Dependent Claim
71 words
In combination: means for simultaneously directing a plurality of radiant energy waves having at least a plurality of substantially coherent frequencies in opposite directions through a polarization dispersive medium; means comprising a medium common to at least a portion of the path of each of said waves for amplifying said waves; frequency responsive reflecting filter means in said path; and means for varying said frequencies comprising means for moving said medium.
Claim 3
Dependent Claim
26 words
The combination in accordance with claim 1 wherein said path is defined at least in part by a plurality of said frequency responsive reflecting filter means.
Claim 4
Dependent Claim
31 words
The combination in accordance with claim 2 wherein a plurality of said waves shift in frequency in opposite directions as a function of the rotation of said path around an axis.
Claim 5
Dependent Claim
32 words
The combination in accordance with claim 3 wherein said amplifying means comprises means for producing a population inversion in at least one of a plurality of possible energy states in said medium.
Claim 6
Dependent Claim
13 words
The combination in accordance with claim 4 wherein said medium comprises a fluid.
Claim 7
Dependent Claim
17 words
The combination in accordance with claim 5 wherein said medium comprises a mixture of helium and neon.
Claim 8
Dependent Claim
19 words
The combination in accordance with claim 1 wherein the free space wavelengths of said waves are substantially 6,328 Angstroms.
Claim 9
Dependent Claim
16 words
The combination in accordance with claim 1 wherein polarization dispersive means are positioned within said strUcture.
Claim 10
Dependent Claim
24 words
The combination in accordance with claim 8 wherein said polarization dispersive means provide both reciprocal polarization dispersion and nonreciprocal polarization dispersion of said waves.
Claim 11
Dependent Claim
66 words
In combination: means for simultaneously directing waves having at least a plurality of substantially coherent frequencies in opposite directions along a path; frequency responsive reflecting filter means; means in said path comprising a medium common to all of said waves for amplifying said waves; and means for varying the length of said path as a function of the variations in frequencies of all of said waves.
Claim 12
Dependent Claim
66 words
In combination: means for simultaneously directing waves having at least a plurality of substantially coherent frequencies in opposite directions along a path; frequency responsive reflecting filter means; means in said path comprising a medium common to all of said waves for amplifying said waves; and means for varying the length of said path as a function of the variations in frequencies of all of said waves.
Claim 13
Dependent Claim
22 words
The combination in accordance with claim 10 wherein at least two pairs of said waves travel in opposite directions through said medium.
Claim 14
Dependent Claim
22 words
The combination in accordance with claim 11 wherein frequency differences between said waves vary as a function of movement of said path.
Claim 15
Dependent Claim
37 words
The combination in accordance with claim 12 wherein said path is defined at least in part by a plurality of said frequency responsive reflecting filter means positioned respectively at a plurality of spaced locations along said path.
Claim 16
Dependent Claim
26 words
The combination in accordance with claim 13 wherein at least two of said waves travelling in the same direction along said path have substantially different polarizations.
Claim 17
Dependent Claim
24 words
The combination in accordance with claim 14 wherein said amplifying means comprises a medium extending along at least a substantial portion of said path.
Claim 18
Dependent Claim
17 words
The combination in accordance with claim 15 wherein said medium has a plurality of possible energy states.
Claim 19
Dependent Claim
26 words
The combination in accordance with claim 16 wherein said amplifying means comprises means for producing a population inversion in at least one of said energy states.
Claim 20
Dependent Claim
13 words
The combination in accordance with claim 17 wherein said medium comprises a fluid.
Claim 21
Dependent Claim
14 words
The combination in accordance with claim 18 wherein said gas comprises helium and neon.
References Cited (Backward Citations)
US3741657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |