Patent ID: 7265847
Filing Date: 2007-09-04
Classification: G01J,G01K

Abstract:
1. An LCI-based optical temperature sensing system comprising: a polarization-based sensing interferometer comprising an optical temperature sensing component having a temperature-dependent birefringence for providing a path length difference sensitive to a temperature to be measured, said sensing interferometer having a sensing dispersion; a readout interferometer optically coupled to said sensing interferometer and comprising one of a Fizeau interferometer made of an optical wedge and a polarization interferometer made of a birefringent wedge, said readout interferometer for providing a spatially distributed interferogram, said readout interferometer having a readout dispersion; an optical detection system for measuring said interferogram and for providing an interferogram signal; and a signal processing unit for numerically compensating an unbalanced dispersion on said interferogram signal resulting from a difference between said sensing dispersion and said readout dispersion.