Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1983-12-16
1986-02-11
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964, G01B 902
Patent
active
045695938
ABSTRACT:
In the rotation rate measuring instrument, a light beam produced by a laser (1) is divided in a beam splitter (4) into two component beams (I.sub.CW, I.sub.CCW) which travel in opposite directions around an optical waveguard (9) forming a closed light path. A Bragg cell (6, 7) is inserted between the beam splitter and each end of the optical waveguide. One of the Bragg cells (6) is driven with a signal (f.sub.VCO) whose frequency is varied in accordance with the rotation rate. For the other Bragg cell, a switch (33) switches periodically between two drive signals (f.sub.MH, f.sub.ML), so that the component beam is frequency-modulated (f.sub.S). A regulating facility (12, 13, 54, 55, 56) is provided which compensates for intensity differences between the two component beams. In further embodiments, it is possible to compensate for those intensity variations of the component beam (I.sub.CW) which are caused by driving the Bragg cell (5) at different frequencies (f.sub.MH, f.sub.ML). It is also possible to design the instrument so that both the intensity differences between the two component beams and the intensity variations within one component beam can be compensated for.
REFERENCES:
patent: 4373814 (1983-02-01), Lacombat et al.
"Sensitive Fiber-Optic Gyroscopes", Physics Today, 10-1981, vol. 34, No. 10.
Auch Wilfried
Schlemper Eberhard
International Standard Electric Corporation
McGraw Vincent P.
O'Halloran John T.
Seitter Robert P.
Turner S. A.
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