Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1982-09-13
1986-03-04
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
045737959
ABSTRACT:
In the measuring instrument, a light beam generated by a laser (1) is split into two component beams (L(CW), L(CCW)) which travel along a coiled optical waveguide (7) in opposite directions. After traversing the optical waveguide, the two component beams are superimposed on each other (5) and directed to an optical/electrical transducer (8). One of the two component beams (L(CW)) is frequency-modulated in a Bragg cell (6) before entering the optical waveguide (7), switchover being effected between two modulation frequencies (f1, f2) at a given frequency (F.sub.S). The modulation frequencies are chosen so that, after traversal of the optical waveguide (7), the phase differences (.phi..sub.B1, .phi..sub.B2) between the two component beams (if the rotation rate .OMEGA.=0) are .pi./2 and 3.pi./2 or even integral multiples thereof. In case of rotation, the phase difference (.phi..sub.S) caused by the Sagnac effect is superimposed on these phase differences. The output signal of the optical/electrcal transducer (8) is passed through a band-pass filter (10) whose midfrequency is equal to the frequency at which switching takes place between the two modulating signals. The amplitude of the band-pass output signal is directly proportional to the rotation rate (.OMEGA.). From this signal, a control signal can be derived which can be used to compensate for the phase difference (.phi..sub.S) caused by the Sagnac effect.
REFERENCES:
patent: 4280766 (1981-07-01), Goss et al.
patent: 4408882 (1983-10-01), Sheem
Cahill et al., "Phase-Nulling Fiber-Optic Laser Gyro", Optics Letters, vol. 4, No. 3, Mar. 1979, pp. 93-95.
R. Ulrich, Optics Letters 5, 173 (1980).
Auch Wilfried
Mohr Friedemann
Schlemper Eberhard
Steudle Walter
International Standard Electric Corporation
McGraw Vincent P.
Peterson T. L.
Turner R. C.
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