Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1977-07-06
1979-02-06
Corbin, John K.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
350 9611, 350 9617, G01B 902
Patent
active
041381963
ABSTRACT:
A rotary motion sensor which employs a fiber interferometer more particularly comprises a system for driving a laser interferometer and electronically detecting the fringe shifts caused by rotation. In the preferred embodiment, a light emitting diode pumps a fiber laser which, in turn, drives a distribution waveguide. Coherent radiation from the distribution waveguide is partly backward-coupled by means of an acousto-optic grating into a reference optical waveguide. The acousto-optic grating also serves to offset the laser frequency by the acoustic drive frequency. Coherent radiation from the distribution waveguide is also coupled into each end of a multiple turn optical waveguide which serves as a fiber interferometer. A pair of directional couplers, one for the clockwise radiation and one for the counter-clockwise radiation, extract the coherent radiation from the fiber interferometer after the radiation has made at least one transversal of the multiple turn optical waveguide. The respective clockwise and counter-clockwise signals will be phase shifted in proportion to the rotational rate of the system, and these phase shifted signals from the directional couplers are separately heterodyned in a pair of detectors with the offset coherent radiation signal from the reference optical waveguide. The output from the respective detectors comprise two signals at the acousto-optic drive frequency which have the same phase relationship as the coherent optical signals. The relative phase between the two acoustic signals may be detected by conventional electronics to provide a measure of the rotation rate of the system.
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"Fiber Beampaths Expected to Enhance Laser Gyro's Accuracy and Slash Cost", Laser Focus, vol. 11, No. 6, Jun. 1975.
Corbin John K.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Korch Matthew W.
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