期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 18, 期 5-8, 页码 874-876出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2006.871832
关键词
axial strain; Bragg wavelength; fiber Bragg grating (FBG); pressure sensor; temperature compensation
A temperature-insensitive sensing scheme for pressure measurement is presented. In the sensing scheme, a single optical fiber Bragg grating (FBG) is axially strained by its surrounding pressure, and is thermally compensated by a bimaterial effect. The FBG is kept tight (i.e., in a positive strain) initially in the sensing structure. When the surrounding temperature increases, a negative strain (to loosen the FBG) is incurred on the FBG and produces a blue shift of the Bragg wavelength. Temperature compensation is, thus, made by balancing such blue shift and the inherent thermally induced red shift of the FBG. Experimental results show a pressure sensitivity of the fractional change in the Bragg wavelength of 1.8 x 10(-2) (MPa)(-1), and demonstrate quite a low response to the temperature varying from 10 degrees C to 60 degrees C.
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