Fiber optic sensor for detecting very small displacements of...

Details Fiber optic sensor for detecting very small displacements of... Fiber optic sensor for detecting very small displacements of...

G - Physics

08

C

340/136, 349/56

G08C 21/00 (2006.01) G01D 5/26 (2006.01) G01H 9/00 (2006.01)

Patent

CA 1229674

ABSTRACT OF THE DISCLOSURE A light source coupled to a first fiber optic wave- guide which is coupled by a first directional coupler and a second directional coupler to a second waveguide. The first waveguide has a phase modulator, a delay loop and a polarization controller therein to cause a differential delay time T on counterpropagating coherent light waves phase modulated at a frequency 1M. The first directional coupler has one part connected to a photodector and the second directional coupler has a probe coupled to the first fiber and the second fiber. The probe directs light toward a surface whereupon the counterpropagating waves are shifted in phase by an amount proportional to the amplitude of displacement of the surface.

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