Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1982-09-29
1984-02-21
Punter, William H.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
044326475
ABSTRACT:
Light pulses periodically produced by a light source are each split into two pulses by an optical splitter and so introduced into a closed optical optical-fiber loop having at least one turn that they travel through the optical-fiber loop in opposite directions. After each circulation, a part of the pulses is extracted and fed to at least two adjacent optical/electrical transducers.
The position of the interference pattern obtained by heterodyning is so controlled that an extreme value of the intensity distribution is present at the line of contact of the optical/electrical transducers. From the output signals of the optical/electrical transducers, a sum signal and a difference signal are formed. The sum signals are used to eliminate the amplitude dependence of the different signals. The rotation rate is determined from the difference between the difference signals assigned to two successive circulations around the optical-fiber loop.
REFERENCES:
patent: 3363104 (1968-01-01), Waite et al.
patent: 4133612 (1979-01-01), Redman
patent: 4152072 (1979-05-01), Hutchings
patent: 4156135 (1979-05-01), Miller, Jr. et al.
patent: 4272193 (1981-06-01), Eastman et al.
Arditty et al., "Re-entrant Fiberoptic Approach to Rotation Sensing", SPIE vol. 157, 1978, pp. 138-148.
Martin et al., "Fiber Optic Laser Gyro Signal Detection & Processing Technique", SPIE vol. 139, Guided Wave Optical Systems & Devices, 1978, pp. 98-102.
International Standard Electric Corporation
Kristofferson T. E.
Punter William H.
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