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Proceedings Paper

Development of highly stable BOTDR strain sensor employing microwave heterodyne detection and tunable electric oscillator
Author(s): Hiroshige Ohno; Hiroshi Naruse; Norifumi Yasue; Yoshiaki Miyajima; Haruyoshi Uchiyama; Yoshiyuki Sakairi; Zhi Xien Li
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Paper Abstract

We successfully developed a new Brillouin-OTDR (BOTDR) that is highly stable in the face of surrounding temperature fluctuations it by employing a microwave heterodyne receiver and a tunable electric oscillator. We were able to realize good frequency and power stability because the BOTDR only pulse-modulates the probe light launched into the sensing fiber. The design is optimized to detect cracks that occur in concrete structures by measuring the strain in a sensing fiber fixed to the concrete structure at a certain level. We demonstrated that the BOTDR could measure the strain in a 10 km long sensing fiber to an accuracy of 10 (mu) (epsilon) (corresponding to 0.5 K in temperature) with an optimum spatial resolution of 20 ns. This accuracy is sufficient given the required strain of 50 (mu) (epsilon) for crack detection. In addition, the BOTDR strain deviation caused by temperature fluctuation was less than several (mu) (epsilon) . The simple design of the BOTDR meant that the measurement time could be reduced to 170 sec.

Paper Details

Date Published: 30 October 2001
PDF: 12 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447327
Show Author Affiliations
Hiroshige Ohno, NTT Corp. (Japan)
Hiroshi Naruse, NTT Corp. (Japan)
Norifumi Yasue, NTT Corp. (Japan)
Yoshiaki Miyajima, NTT Corp. (Japan)
Haruyoshi Uchiyama, Ando Electric Co., Ltd. (Japan)
Yoshiyuki Sakairi, Ando Electric Co., Ltd. (Japan)
Zhi Xien Li, Ando Electric Co., Ltd. (Taiwan)


Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II

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