Endless fiber interferometer rotary motion sensor

Details Endless fiber interferometer rotary motion sensor Endless fiber interferometer rotary motion sensor

1977-07-06

1979-01-09

Clark, Conrad J.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350 9613, G01B 902

Patent

active

041336127

ABSTRACT:
A rotary motion sensor which employs an endless, closed-loop, multiple turn fiber interferometer. Coherent laser radiation is coupled into the fiber interferometer in both a clockwise and counter-clockwise direction and is permitted to traverse the entire interferometer waveguide many times so as to increase the cumulative phase shift due to multiple traversal. Means are provided for coupling the coherent radiation into and out of the fiber interferometer. Means are also provided for generating a pair of reference optical signals which are heterodyned with the extracted clockwise and couterclockwise signals to produce a pair of beat frequency signals at manageable, acoustic frequencies. The relative cumulative phase shift between the output acoustic signals and the circulating signals are the same so as to provide an extremely precise measurement of the rate of rotation. In a preferred embodiment, the coupling means as well as the reference signal generating means comprise an acoustic waveguide for generating an acousto-optic grating across the paths of the coherent optical signal and the fiber interferometer.

REFERENCES:
patent: 3589794 (1971-06-01), Marcatili
patent: 3666349 (1972-05-01), Hubby, Jr.
patent: 3714607 (1970-08-01), Cutler
patent: 3841758 (1974-10-01), Gievers
patent: 3846025 (1974-11-01), Wilber
patent: 3910373 (1975-10-01), Newburgh et al.
patent: 4013000 (1977-05-01), Rogelnik
Stone, J. et al., "Nd:YAG Single-Crystal Fiber Laser" Appl. Phys. Lett., . 25, No. 1, Jul. 1976.
"Fiber Blampaths expected to enhance Laser Gyro's Accuracy and Slash Cost" Laser Focus, vol. 11, No. 6, Jun. 1975.

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