Fiber optic interferometer transducer

Details Fiber optic interferometer transducer Fiber optic interferometer transducer

G - Physics

01

L

88/97.4

G01L 1/24 (2006.01) G01D 5/26 (2006.01) G01D 5/34 (2006.01)

Patent

CA 1247421

ABSTRACT OF THE DISCLOSURE A sensor or transducer having a dual path opti- cal fiber, such as a single mode, two polarization state, waveguide fiber, utilizes the relative change in propaga- tion constant of the paths to sense and transduce an applied force to an interference variation and ultimately an electrical signal. In this arrangement, in-phase light is introduced to both polarized states or paths in the fiber and transmitted therealong past a stress area of birefringement inducing force and ultimately combined, thereby producing in the combined beam a variation in interference which is related to the applied force. Specific structures are provided for converting isotropic forces such as pressure and temperature to anisotropic forces on the fiber to thereby produce birefringement and to also magnify the latter effect.

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