5 December 2005 A novel distributed sensor using optical fiber
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Proceedings Volume 6019, Passive Components and Fiber-based Devices II; 60191C (2005) https://doi.org/10.1117/12.635145
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China
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.
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Junguo Yuan, Chun Zhan, Qizhen Sun, Deming Liu, Yi He, "A novel distributed sensor using optical fiber", Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191C (5 December 2005); doi: 10.1117/12.635145; https://doi.org/10.1117/12.635145
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