Patent ID: 6075907
Filing Date: 2000-06-13
Classification: G01D,G01L

Abstract:
An optical waveguide sensor system for sensing at least one physical parameter comprising:a laser light source for providing a light signal composed of two wavelengths .lambda..sub.1 and .lambda..sub.2 ;an optical waveguide for receiving and propagating the light signal;a long period grating disposed in the path of the light signal having a resonance wavelength dependent on the physical parameter;a detector positioned in an operable relationship to the long period grating for detecting the power each of the two wavelengths .lambda..sub.1 and the .lambda..sub.2 transmitted through the long period grating; anda processor attached to the detector for correlating the change in optical power each of the two wavelengths .lambda..sub.1 and the .lambda..sub.2 with a numerical value for the physical parameter sensed.