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Proceedings Paper

Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement
Author(s): Leilei Shi; Tao Zhu; Fangyuan Chen; Kinseng Chiang; Yunjiang Rao
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Paper Abstract

We demonstrate a fiber ring laser for high-resolution torsion measurement, where the laser cavity consists of a Mach-Zehnder interferometer (MZI) formed with a pair of long-period fiber gratings written in a twisted single-mode fiber (SMF) by a CO2 laser. The emitting wavelength of the laser provides a measure of the rate of the torsion applied to the grating pair, while the direction of the wavelength shift indicates the sense direction of the applied torsion. The narrow linewidth and the large side-mode suppression ratio of the laser can provide a much more precise measurement of torsion, compared with passive fiber-optic torsion sensors. The torsion sensitivity achieved is 0.084 nm/(rad/m) in the torsion range ±100 rad/m, which corresponds to a torsion resolution of 0.12 rad/m, assuming a wavelength resolution of 10 pm for a typical optical spectrum analyzer.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510K (30 January 2012); doi: 10.1117/12.914366
Show Author Affiliations
Leilei Shi, Chongqing Univ. (China)
Tao Zhu, Chongqing Univ. (China)
Fangyuan Chen, Chongqing Univ. (China)
Kinseng Chiang, City Univ. of Hong Kong (Hong Kong, China)
Chongqing Univ. (China)
Yunjiang Rao, Univ. of Electronic Science & Technology of China (China)

Published in SPIE Proceedings Vol. 8351:
Third Asia Pacific Optical Sensors Conference
John Canning; Gangding Peng, Editor(s)

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