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Proceedings Paper

Multiplexed strain sensing by synthesis of optical coherence function with time-division phase shift modulation
Author(s): Kazuo Hotate; Kiyotaka Matsuo; Kwang-Yong Song; Zuyuan He
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Paper Abstract

Fiber Bragg grating (FBG) can be multiplexed to realize a quasi-distributed strain or temperature sensing system by use of FBGs of different Bragg wavelength. For a sensing system requiring large number of sensing points, however, this method has difficulties in cost and multiplexable number. On the other hand, we have successfully multiplexed FBGs of the same Bragg wavelength by applying the technique of synthesis of optical coherence function. The measurement range of the technique is limited to the period of the coherence function. Thereafter, we applied Vernier scheme to the system which actively makes use of the periodical coherence function to distinguish the FBGs. In this paper, we propose a new frequency modulation method, time-division phase shift modulation, which solves the FBG-positioning problem in our previous system applying Vernier scheme to the multiplexed FBG sensing with SOCF. Experimental results are reported.

Paper Details

Date Published: 12 October 2007
PDF: 8 pages
Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 677007 (12 October 2007); doi: 10.1117/12.732835
Show Author Affiliations
Kazuo Hotate, Univ. of Tokyo (Japan)
Kiyotaka Matsuo, Univ. of Tokyo (Japan)
Kwang-Yong Song, Univ. of Tokyo (Japan)
Zuyuan He, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 6770:
Fiber Optic Sensors and Applications V
Eric Udd, Editor(s)

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