A Novel Acoustic Emission Fiber Optic Sensor Based on a Single Mode Optical Fiber Coupler |
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| Authors: | Chen Rongsheng LIAO Yanbiao Zheng Gangtie Liu Tongyu Gerard Franklyn Fernando |
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| Affiliation: | 1. Department of Electronic Engineering, Tsinghua University,
2. Sensors and Composite Group, Engineering System Department, Royal Military College of Science, Cranfield University, Shrivenham, Swindon, SN6 8LA, UK |
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| Abstract: | This paper reports, for the first time, on the use of a fused-taper single mode optical fiber coupler as a sensing element for the detection of acoustic emission (AE) and ultrasound. When an acoustic wave impinges on the mode-coupling region of a coupler, the coupling coefficient is modulated via the photo-elastic effect. Therefore, the transfer function of the coupler is modulated by an acoustic wave. The sensitivity of the sensor at 140 kHz was approximately 5.2 mV/Pa and the noise floor was 1 Pa. The bandwidth of the sensor was up to several hundred kHz. This AE sensor exhibits significant advantage compared with interferometer-based AE sensors. |
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