G - Physics – 01 – B
Patent
G - Physics
01
B
345/10, 345/26
G01B 9/02 (2006.01) G01C 19/66 (2006.01) G01P 9/00 (2006.01)
Patent
CA 1089965
ABSTRACT OF THE DISCLOSURE Disclosed herein is a ring laser gyroscope whose output photodetector assembly is a laminated structure having three electrically mutually isolate photodiodes on a common substrate, located directly behind a multilayer dielectric- coated, partially light-transmissive mirror that is one of the reflective elements of the ring laser. A small proportion of light energy of the beams incident on the mirror is allowed to pass through the mirror and strikes the photodiodes. Two of the diodes are masked in such a manner that they generate a heterodyne beat signal which represents lateral displacement of the interference fringe pattern set up in the area of inter- section of the two oppositely directed beams in the ring laser. The resulting output signal is used to determined the rate of rotation of the ring laser body. The third diode sums the light intensity of the fringe pattern and generates an output signal which, in a feedback arrangement, is applied to a cavity length control circuit.
294468
Litton Systems Inc.
Macrae & Co.
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