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Temperature compensation of optical fiber Bragg grating pressure sensor

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4 Author(s)
Hsu, Y.S. ; Inst. of Photonics Technol., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Wang, Likarn ; Wen-Fung Liu ; Chiang, Y.J.

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 1.8×10-2 (MPa)-1, and demonstrate quite a low response to the temperature varying from 10°C to 60°C.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 7 )