Distributed fiber sensing system with wide frequency response and accurate location |
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| Institution: | 1. State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, Sichuan, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Xuchang Vocational College, Xuchang 461000, Henan, China;4. School of Computer Science & Technology, Sichuan University, Chengdu 610064, China;1. Department of Photonics, Feng Chia University, Taichung, Taiwan, ROC;2. Department of Electro-Optical Engineering, National United University, Miaoli, Taiwan, ROC;1. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China;2. College of Computer and Information Technology, Nanyang Normal University, Nanyang 473061, China;1. Department of Mechanical, Materials and Aerospace Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA;2. Department of Mechanical Engineering, Northern Illinois University, DeKalb, IL 60115, USA;3. Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari 70126, Italy;1. School of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China;2. College of Optical Sciences, The University of Arizona, Tucson, AZ 85721, USA |
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| Abstract: | A distributed fiber sensing system merging Mach–Zehnder interferometer and phase-sensitive optical time domain reflectometer (Φ-OTDR) is demonstrated for vibration measurement, which requires wide frequency response and accurate location. Two narrow line-width lasers with delicately different wavelengths are used to constitute the interferometer and reflectometer respectively. A narrow band Fiber Bragg Grating is responsible for separating the two wavelengths. In addition, heterodyne detection is applied to maintain the signal to noise rate of the locating signal. Experiment results show that the novel system has a wide frequency from 1 Hz to 50 MHz, limited by the sample frequency of data acquisition card, and a spatial resolution of 20 m, according to 200 ns pulse width, along 2.5 km fiber link. |
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| Keywords: | Distrusted fiber sensor Mach–Zehnder interferometer Phase-sensitive OTDR |
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