G - Physics – 01 – C
Patent
G - Physics
01
C
G01C 19/72 (2006.01)
Patent
CA 2071882
The present invention relates to an optical interferometric gyro having reduced return light to the light source. The gyro is configured such that light from a light source is split by a first optical coupler into two light beams. One of the light beams is further split by a second optical coupler into two beams. One of the second mentioned light beams is provided as a clockwise light beam to one end of a looped optical transmission line, and the other light beam is provided as a counterclockwise light beam to the other end of the looped optical transmission line. The clockwise and counterclockwise light beams after having been passed through the looped optical transmission line are combined by the second optical coupler to interfere with each other. The interference light is branched by the firs optical coupler to the light source and a photodetector, and an angular velocity applied to the looped optical transmission line about its axis is detected from the output of the photodetector. The branching ratio of the first optical coupler is selected such that the quantity of light to be branched to the photodetector is larger than the quantity of light to be branched to the light source.
Japan Aviation Electronics Industry Limited
Kirby Eades Gale Baker
LandOfFree
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