Fiber optic measuring device, rate gyro, navigation and stabiliz

Details Fiber optic measuring device, rate gyro, navigation and stabiliz Fiber optic measuring device, rate gyro, navigation and stabiliz

1991-04-16

1993-01-19

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051810786

ABSTRACT:
A fiber optic measuring device can be used, for example, as a rate gyro. Variation in a measured parameters engenders a phase difference between two waves. The measuring device includes a light source 1, a SAGNAC ring interferometer 2, a detector 3, a phase modulator 4, and a electronic unit 7. The electronic unit 7 includes a processing system 9 which furnishes a signal that is a function of the measured parameter and an electronic sub-unit 12 for controlling the phase modulator 4. The control signal for the modulator is a superposition of a first, periodic gating, bias signal .PHI..sub.b (t) with period 2.tau. and amplitude .PHI..sub.bm, and of a second, staircase, negative-feedback signal .PHI..sub.m (t) synchronized with .PHI..sub.b (t), each step of which has a duration equal to .tau. or to one of its sub-multiples, and an amplitude .PHI..sub.s, which is a function of the value of the measured parameter and which falls back to zero when its amplitude exceeds a predetermined value .PHI..sub.mm . .PHI..sub.bm and .PHI..sub.mm are slaved to 2.PHI..sub.bm +.PHI..sub.mm =2n.pi. (where n is an integer). The response to the singular phase shift introduced during the fall-back of the negative-feedback signal is for this slaving and hence is used to keep the gain of the modulation chain constant.

REFERENCES:
patent: 4299490 (1981-11-01), Cahill
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 5056919 (1991-10-01), Arditty et al.
patent: 5116127 (1992-05-01), Grollman
patent: 5116129 (1992-05-01), Ishigami
patent: 5123741 (1992-06-01), Spahlinger

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