Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1983-11-29
1986-05-27
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902, G01C 1964
Patent
active
045912696
ABSTRACT:
In the rotation rate measuring instrument, two component beams derived from a light beam produced by a laser circulate around a coiled optical waveguide (radius R, length L) in opposite directions. From the phase difference between the two component beams due to the Sagnac effect, the rotation rate is determined. Before entering the optical waveguide, each of the two component beams is modulated in a modulator (5, 6) such that the phase differences (2.nu.+1).pi./2, (2.nu.+5).pi./2, and (2.nu.+3).pi./2 (where .nu. is an arbitrary integer) exist periodically between the two component beams emerging from the optical waveguide. The drive signals for the two modulators, which exhibit periodic frequency changes of 2F, are varied in such a way that the output of an optical-to-electrical transducer (2) to which the two component beams are directed after travelling around the optical waveguide provides a constant signal. To compensate for the Sagnac phase difference, an additional frequency difference of .DELTA.f is required between the two drive signals. The rotation rate .OMEGA. is determined by the equation ##EQU1## where .lambda.=vacuum wavelength of the light, and C=velocity of light in vacuo.
REFERENCES:
patent: 4372685 (1983-02-01), Ulrich
patent: 4410275 (1983-10-01), Shaw et al.
"Phase Nulling Optical Gyro", Cahill et al., Proceedings of the I.E.E.E. National Aerospace and Electronics Conference, 5-1979, pp. 8-13.
"Techniques for Shot Noise Limited Inertial Rotation Measurement Using a Multiturn Fiber Sagnac Interferometer", Davis et al., SPIE, vol. 157, 1978, pp. 131-136.
International Standard Electric Corporation
McGraw Vincent P.
O'Halloran John T.
Turner S. A.
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