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Proceedings Paper

FBG sensor interrogation based on RF signal measurement
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Paper Abstract

A novel interrogation method for optical fiber Bragg grating (FBG) sensors has been proposed by converting the change of the FBG wavelength into the phase difference between two radio frequency (RF) signals. As a result, the beating-induced RF signal power changes with the FBG wavelength shift. This technique could be used for high speed FBG interrogation and, due to the use of a second FBG to produce the reference RF signal, temperature cross-sensitivity effect is compensated automatically. Theoretical analysis and experimental demonstration have been carried out. Performances of the FBG sensor interrogation scheme have been studied.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700423 (16 May 2008); doi: 10.1117/12.785928
Show Author Affiliations
Xinyong Dong, The Hong Kong Polytechnic Univ. (Hong Kong China)
Li-Yang Shao, The Hong Kong Polytechnic Univ. (Hong Kong China)
H. Y. Fu, The Hong Kong Polytechnic Univ. (Hong Kong China)
H. Y. Tam, The Hong Kong Polytechnic Univ. (Hong Kong China)
C. Lu, The Hong Kong Polytechnic Univ. (Hong Kong China)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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