Patent ID: 6452667
Filing Date: 2002-09-17
Classification: G01D,G01K

Abstract:
A pressure-isolated fiber optic temperature sensor, comprising:an optical sensing element, having an outer transverse dimension of at least 0.3 mm and having at least one reflective element disposed therein, said reflective element having a reflection wavelength; a first optical fiber exiting from at least one axial end of said sensing element; said reflection wavelength changing due to a change in the temperature of said sensing element; a pressure isolating structure, fused to an outer surface of said sensing element, which encloses said reflection element so as to isolate said reflective element from strains due to pressure external to said pressure isolating structure such that said reflection wavelength does not change due to a change in said external pressure; and at least a portion of said sensing element and said pressure isolating structure having a transverse cross-section which is contiguous and made of substantially a single material.