Fiber-optic Michelson interferometer fixed in a tilted tube for direction-dependent ultrasonic detection |
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| Affiliation: | 1. CEA, DEN, DTEC, SGCS, F-30207 Bagnols-sur-Cèze, France;2. CEA, DEN, DTEC, SEPE, F-30207 Bagnols-sur-Cèze, France;3. Aix-Marseille Université, CNRS, IUSTI, UMR 7343, 13453 Marseille Cedex 13, France;1. Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, S-971 87 Sweden;2. University of Mosul, College of Engineering, Department of Mechanical Engineering, Mosul, Iraq;1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084 China;2. Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing, 100048 China;3. School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907 USA;4. Ingram School of Engineering, Texas State University, San Marcos, TX, 78746 USA |
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| Abstract: | ![]()
A fiber-optic interferometer is proposed and demonstrated experimentally for ultrasonic detection. The sensor consists of a compact Michelson interferometer (MI), which is fixed in a tilted-tube end-face (45°). Thin gold films are used for the reflective coatings of two arms and one of the interference arms is etched serving as the sensing arm. The spectral sideband filter technique is used to interrogate the continuous and pulse ultrasonic signals (with frequency of 300 KHz). Furthermore, because of the asymmetrical structure of the sensor, it presents strong direction-dependent ultrasonic sensitivity, such that the sensor can be considered a vector detector. The experimental results show that the sensor is highly sensitive to ultrasonic signals, and thus it can be a candidate for ultrasonic imaging of seismic physical models. |
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| Keywords: | Fiber-optic Michelson interferometer Ultrasonic detection |
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