Integrated triad optical rate sensor apparatus

Details Integrated triad optical rate sensor apparatus Integrated triad optical rate sensor apparatus

1987-04-21

1989-05-09

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01C 1964

Patent

active

048283894

ABSTRACT:
A triad sensor apparatus (300) comprises a passive ring Sagnac interferometric arrangement having a light source circuit (308) and a series of three multi-turn fiber optic rings (302, 304, 306). An optics/modulator circuit (312) is adapted to selectively switch optical waves emitted from the light source circuit (308) and transmit the signals through the corresponding fiber optic rings as counterpropagating optical waves. Nonreciprocal phase modulation is applied to the counter-propagating waves, and the waves are recombined so as to produce a "zero order" fringe pattern having an intensity varying in accordance with the relative phase between the counterpropagating waves. Optical waves from the light source circuit (308) are selectively applied to a ring path during a given time period, while the photodetector circuit (324) is detecting light waves which have emerged from another ring path during the same given time period. Certain of the circuit components associated with signal processing circuitry (328) are selectively timed-shared with respect to signals associated with each of the gyroscope channels.

REFERENCES:
patent: 4265541 (1981-05-01), Leclerc et al.
patent: 4645345 (1987-02-01), Domann

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