DocumentCode :
871952
Title :
Temperature compensation of optical fiber Bragg grating pressure sensor
Author :
Hsu, Y.S. ; Wang, Likarn ; Liu, Wen-Fung ; Chiang, Y.J.
Author_Institution :
Inst. of Photonics Technol., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Volume :
18
Issue :
7
fYear :
2006
fDate :
4/1/2006 12:00:00 AM
Firstpage :
874
Lastpage :
876
Abstract :
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.
Keywords :
Bragg gratings; compensation; fibre optic sensors; pressure measurement; pressure sensors; red shift; 10 to 60 degC; bimaterial effect; blue shift; optical fiber Bragg grating; pressure sensor; red shift; temperature compensation; Bragg gratings; Capacitive sensors; Fiber gratings; Optical fiber sensors; Optical fibers; Optical sensors; Pressure measurement; Strain measurement; Temperature sensors; Wavelength measurement; Axial strain; Bragg wavelength; fiber Bragg grating (FBG); pressure sensor; temperature compensation;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2006.871832
Filename :
1608191
Link To Document :
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