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Proceedings Paper

Direct and simultaneous detection of temperature and strain using combined Brillouin and Raman backscatters in single mode fiber
Author(s): Haiyun Xia; Hongqian Mu; Yuanhong Yang; Dongsong Sun
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Paper Abstract

A novel direct detection method for simultaneous distributed measurement of the temperature and strain along a single mode fiber based on the optical time-domain reflectometer technique is proposed. The Raman backscattering is sensitive to temperature but not to strain, thus the temperature distribution along the fiber can be determined. A twin-channel Fabry-Perot interferometer is designed; of which, the Brillouin channel is used to analyze the strain information within measurement range of 2000 με strain and 400 °C temperature. The frequency center, spectrum bandwidth and intensity changes of Brillouin backscattering are transformed into transmission changes after passing through the Fabry-Perot interferometer. With the look-up table of response functions of detected temperature, the strain profile along the fiber can be known. The Rayleigh channel is design to preset and measure the outgoing laser frequency relative to the Brillouin channel. By modulating the voltage added to the piezoelectric tube of the Fabry-Perot interferometer, the frequency offset of outgoing laser to the Brillouin channel can be preset; the temperature dynamic range can be extended.

Paper Details

Date Published: 26 November 2007
PDF: 6 pages
Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 683021 (26 November 2007); doi: 10.1117/12.757639
Show Author Affiliations
Haiyun Xia, BeiHang Univ. (China)
Hongqian Mu, BeiHang Univ. (China)
Yuanhong Yang, BeiHang Univ. (China)
Dongsong Sun, Anhui Institute of Optics & Fine Mechanics (China)

Published in SPIE Proceedings Vol. 6830:
Advanced Sensor Systems and Applications III
Yun-Jiang Rao; Yanbiao Liao; Gang-Ding Peng, Editor(s)

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