Optical fiber measuring device, gyrometer, central navigation an

Details Optical fiber measuring device, gyrometer, central navigation an Optical fiber measuring device, gyrometer, central navigation an

1989-09-13

1991-08-13

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356350, G01B 902

Patent

active

050392204

ABSTRACT:
The invention relates to an optical fiber measuring device of the type in which variation of a measured parameter causes a difference of progression of light waves in the optical fiber. Such a device permits measurement of speed of rotation, or of current and magnetic field. The device includes an electronic device for digitally processing a signal indicative of phase shift of one light wave relative to another, the light waves propagating through a preferably monomode optical fiber in a SAGNAC ring interferometer, modulated by a phase modulator. The electronic device includes an analog-digital converter 11, a digital processing system 12 for generating a processor signal reduced to a frequency of modulation around the optical fiber, a control loop digital filter 13 for supplying a parameter indication signal, a register 14 for receiving the parameter indication signal and supplying a register signal which is a function of the measured parameter, an accumulator 15 for generating a digital feedback signal which is a function of the measured parameter, and a digital-analog converter 16 for generating an analog feedback signal for controlling the phase modulator.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 4872754 (1989-10-01), Ensley

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