Apparatus for measuring rotation by a combination of the Sagnac

Details Apparatus for measuring rotation by a combination of the Sagnac Apparatus for measuring rotation by a combination of the Sagnac

1986-03-26

1989-03-28

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

048158526

ABSTRACT:
Rotation is detected by splitting a beam of phase coherent light into two beams and directing them separately and oppositely around paths at least one of which is separated from and surrounds the axis of rotation. A light transmitting medium having a substantial index of refraction is interposed in said at least one path. The beams are then combined to form a fringe pattern and rotation is indicated by a shift in the fringe pattern due to the Fizeau effect. The length of said medium is made as long as it can be made while still retaining sufficient coherence in the light and intensity to detect the fringe pattern efficiently.

REFERENCES:
patent: 3332314 (1967-07-01), Rosenthal
patent: 4183670 (1980-01-01), Russell
Post "Sagnac Effect" Review of Modern Physics, vol. 39, No. 2, Apr. 1967, pp. 475-479.
Vali et al., "Fresnel-Fizeau Effect in a Rotating Optical Fiber Ring Interferometer" Applied Optics, Oct. 1977, vol. 16 #10, pp. 2605-2607.

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