Measurement of rotation rate using sagnac effect

Details Measurement of rotation rate using sagnac effect Measurement of rotation rate using sagnac effect

1983-04-29

1983-10-25

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01C 1964

Patent

active

044115261

ABSTRACT:
In a Sagnac effect optical fibre gyroscope, which uses a phase nulling photo detection technique to drive a feedback loop controlling one or more non-reciprocal elements connected in series with the coil, a commutating switch reverses the direction of propagation of oppositely directed beams of light directed through the coil and non-reciprocal elements. The null balance is detected as the absence in the photodetector output of any a.c. component in phase or out of phase with the commutation switching. This removes a source of systematic error occasioned by drift in optical parameters of unbalanced components.

REFERENCES:
patent: 4280766 (1981-07-01), Gross et al.
"Techniques for Shot Noise Limited Inertial Rotation Measurement Using a Multiturn Fiber Sagnac Interferometer", Davis et al., SPIE vol. 157 Laser Inertial Rotation Sensors (1978) pp. 131-138.

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