Optical ring resonator gyro using coherent light modulated by a

Details Optical ring resonator gyro using coherent light modulated by a Optical ring resonator gyro using coherent light modulated by a

1993-03-08

1995-02-14

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

053900219

ABSTRACT:
A high level from a reference high level register and a low level from a reference low level register are selectively applied by a change-over switch to a D-A converter in time intervals A+ and B+ of four intervals A+, B+, A- and B- and in the intervals A- and B-, respectively, whereby a rectangular output signal is produced an used to control the current to be injected into a semiconductor laser to control the optical frequency of its output light. The light is introduced, as clockwise and counterclockwise light beams, into a ring-shaped optical path, wherein both light beams propagate therethrough a plurality of times and interfere with each other a plurality of times. Such light beams are taken out of the ring-shaped optical path and their intensities are detected by first and second photodetectors. In the intervals A+ and A- the outputs from the first photodetector are sample-held and the difference between their levels in the intervals A+ and A- is detected by a first subtractor, and such differences are accumulated by a first accumulator to obtain a deviation signal. Similarly, in the intervals B+ and B- the outputs from the second photodetector are sample-held and a deviation is obtained from a second accumulator. The output from the first accumulator and the output from the second accumulator are taken out by a switch in the intervals A+, A- and in the intervals B+, B-, respectively, and they are added to the rectangular output signal to control the current to be injected into the semiconductor laser.

REFERENCES:
patent: 4661964 (1987-04-01), Haavisto
patent: 4674881 (1987-06-01), Lawrence et al.

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