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Proceedings Paper

Distributed fiber-optic sensor with a ring Mach-Zehnder interferometer
Author(s): Qizhen Sun; Deming Liu; Hairong Liu; P. Shum
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Paper Abstract

A novel distributed fiber-optic vibration sensing system is proposed and demonstrated. By employing a ring Mach- Zehnder interferometer structure as the sensing section, which consists of one 3dB fiber coupler, two optical circulators, two symmetric 3×3 fiber couplers, and two fibers, one interferometer operates as double ones. The first one is defined by the CW directional path and the second one is represented by the CCW directional path. When a vibration occurs at certain point, the two interferometers will produce the same phase modulation simultaneously. Both position and frequency of the vibration can be determined by combining two phase signals from the ring Mach-Zehnder interferometer. With a piezo-electronic cylinder contained in the sensing cable to simulate a vibration, we select multiple test positions along the sensing fiber to demonstrate the theoretical analysis. The experimental results exhibit a good repeatability and agreement with the theoretical response. Hence, we conclude that the sensor can measure both the frequency and position of vibration in real time, with a spatial positional resolution better than 40 m in a long sensing distance prototype system.

Paper Details

Date Published: 21 November 2007
PDF: 8 pages
Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67814D (21 November 2007); doi: 10.1117/12.743491
Show Author Affiliations
Qizhen Sun, Huazhong Univ. of Science and Technology (China)
Deming Liu, Huazhong Univ. of Science and Technology (China)
Hairong Liu, Huazhong Univ. of Science and Technology (China)
P. Shum, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 6781:
Passive Components and Fiber-based Devices IV
Ming-Jun Li; Jianping Chen; Satoki Kawanishi; Ian H. White, Editor(s)

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