Patent ID: 6833541
Filing Date: 2004-12-21
Classification: G01B,G01K,G01L,G02B

Abstract:
An optical waveguide grating sensing device for a dual-parameter optical waveguide grating sensor, the sensing device comprising:a first optical waveguide grating of a first resonant wavelength provided in a first section of optical waveguide; and a second optical waveguide grating of a second resonant wavelength provided in a second section of optical waveguide, the first optical waveguide grating being one of a Type I grating fabricated in a hydrogenated optical waveguide, a Type I grating fabricated in a non-hydrogenated optical waveguide, a Type IA grating, and a Type IIA grating, and the second optical waveguide grating being a different one of a Type I grating fabricated in a hydrogenated optical waveguide, a Type I grating fabricated in a non-hydrogenated optical waveguide, a Type IA grating, and a Type IIA grating, wherein the first and second gratings have different coefficients of rate of change of wavelength as a function of temperature and have substantially a same coefficient of rate of change of wavelength as a function of strain.