Interferometer gyro using heterodyne phase detection

Details Interferometer gyro using heterodyne phase detection Interferometer gyro using heterodyne phase detection

G - Physics

01

C

345/10

G01C 19/64 (2006.01) G01C 19/72 (2006.01)

Patent

CA 1136744

INTERFEROMETER GYRO USING HETERODYNE PHASE DETECTION ABSTRACT OF THE DISCLOSURE An interferometer gyro includes a source of light which is divided and introduced into a light path in counter-rotating directions. The light is removed from both counter-rotating directions after it has traversed the path one time, and the removed beams combined with a reference signal. The phase difference between the two combined signals is determined to indicate the rotation of the optical path about which the light traversed. In one embodiment, the signal and reference signals are modulated with frequencies, the difference between which is a frequency which is easily handleable with the electronic circuitry. -1-

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