Apparatus for measuring an ambient isotropic parameter applied t

Details Apparatus for measuring an ambient isotropic parameter applied t Apparatus for measuring an ambient isotropic parameter applied t

1994-05-03

1996-05-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023119, 250225, 356351, 356 1, G01J 104

Patent

active

055170226

ABSTRACT:
An apparatus and a method are provided for measuring an ambient physical parameter applied to a highly birefringent sensing fiber. A light source emits a low coherence light beam into a sensing fiber subjected to an ambient physical parameter. A collector receives the output light beam of the sensing fiber and a splitter divides the output light beam into two orthogonally polarized output beams and subjects the two orthogonally polarized output beams to a range of relative delays. A recombiner combines the two orthogonally polarized output beams to produce an interference pattern, and a detector detects intensities of the interference pattern over the range of delays. A calculating device determines the ambient parameter from the intensities with improved accuracy.

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