Method and apparatus for phase modulating a fiber-optic rotation

Details Method and apparatus for phase modulating a fiber-optic rotation Method and apparatus for phase modulating a fiber-optic rotation

1985-11-21

1988-11-22

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

047861738

ABSTRACT:
A method for phase biasing a fiber-optic SAGNAC rotation sensor is disclosed comprising the inclusion near one end of the sensing coil of a phase modulator consisting of a second coil of fiber free to rotate independently of the sensing coil. The modulator coil is made to oscillate and the desired phase difference modulation is produced by means of the SAGNAC effect in the oscillating coil. Two novel modulator drivers are disclosed. Both have a rigid support hub having radially extending spokes which bend in mechanical synchronism in response to a piezoelectrically induced motive force. The optical fiber is wrapped like a rim around the outside of the spokes for being rotated in an oscillatory manner to effect the desired phase difference modulation.

REFERENCES:
Giallorenzi et al., "Optical Fiber Sensor Technology", IEEE Journal of Quantum Electronics, Apr. 1982, pp. 639-640.
Schiffner, "Optical Fiber Gyroscope Based on the Sagnac Effect", Siemens Res. Rep., vol. 9, pp. 16-25, 1980.

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