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Proceedings Paper

A novel distributed sensor using optical fiber
Author(s): Junguo Yuan; Chun Zhan; Qizhen Sun; Deming Liu; Yi He
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Paper Abstract

A new distributed interferometic sensor for strain and vibrations measurement is proposed in this paper. It measures the first simultaneous information by using Mach-Zehnder Interferometer. We illustrate important points in regard to the proposed distributed signals measurement, and present the preliminary results on the application of optical fiber interferometic sensor (OFIS) for the measurements of distributed signals in long-distance region, and discuss the principles of distributed OFIS based on long-length Mach-Zehnder interferometic technique. We also adopt a new technique by using optical delay effect to improve the spatial resolution of distributed interferometic sensor. It is completely different from the spatial-resolution technique of optical time-domain reflectometry (OTDR). This type of OFIS has better sensitivity and resolution than the others. In addition, this paper describes a form of passive phase demodulation for recovering a signal of interest from a Mach-Zender optical fiber interferometric sensor. It achieves a 100Hz-2KHz frequency of vibrations resolution, with 100-m practical spatial resolution, over a sensing length of 6.8 km. At the time of writing, the system is only partially completed; therefore the content of this paper will focus on the principle of distributed sensor. The results mainly are presented in laboratory.

Paper Details

Date Published: 5 December 2005
PDF: 8 pages
Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191C (5 December 2005); doi: 10.1117/12.635145
Show Author Affiliations
Junguo Yuan, Huazhong Univ. of Science and Technology (China)
Chun Zhan, Jiangxi Science and Technology Normal Univ. (China)
Qizhen Sun, Huazhong Univ. of Science and Technology (China)
Deming Liu, Huazhong Univ. of Science and Technology (China)
Yi He, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 6019:
Passive Components and Fiber-based Devices II
Yan Sun; Jianping Chen; Sang Bae Lee; Ian H. White, Editor(s)

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