Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1981-07-29
1985-07-16
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
045293120
ABSTRACT:
A fiber optic rotation sensor, employing detection of the Sagnac phase shift, comprises a single mode fiber forming a loop. The rotation sensor utilizes unpolarized light to provide reciprocal operation. The unpolarized light produces incoherent light wave components which are averaged to zero in the detector. Non-rotationally induced phase shifts between coherent components resolve into vectors equal in magnitude and opposite in phase angle so that the non-reciprocal components of these vectors cancel.
The rotation sensor is independent of environmental factors when the phase difference between the waves counterpropagating through the loop is an odd multiple of .pi./2. Accordingly, the sensor includes a phase shifter for biasing such phase difference to .pi./2 to provide a stable operating point when the loop is at rest. Additional compensating means are included to provide stability during rotation.
REFERENCES:
patent: 3395270 (1968-07-01), Speller
patent: 4325636 (1982-04-01), Schiffner
patent: 4410275 (1983-10-01), Shaw et al.
"Low-Drift Fibre Gyro Using a Superluminescent Diode," Bohm et al., Electronics Letters, May 14, 1981, vol. 17, #10, pp. 352-353.
"Fiber-Optic Gyroscopes with Broad-Band Sources", Burns et al., Jour. of Lightwave Tech., vol. LT-1, No. 1, Mar. 1983, pp. 98-105.
Fundamentals of Optics, Jenkins et al., McGraw-Hill Book Co. 1957, pp. 489-490.
"An Overview of Fiber-Optic Gyroscopes", Bergh et al., Jour. of Lightwave Tech., vol. LT2, No. 2, Apr. 1984, pp. 94-95.
"Fiber Laser Gyroscope", Vali et al., SPIE vol. 77 (1976), Fibers & Integrated Optics, pp. 110-115.
"Sensitivity Analysis of the Sagnac-Effect Optical-Fiber Ring Interferometer", Lin et al., Applied Optics, vol. 18, No. 6, Mar. 15, 1979, pp. 915-931.
Pavlath George A.
Shaw Herbert J.
McGraw Vincent P.
The Board of Trustees of the Leland Stanford Junior University
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