Chinese Journal of Lasers B, 2001, 10 (3): 195, 网络出版: 2006-08-10  

A Novel Acoustic Emission Fiber Optic Sensor Based on a Single Mode Optical Fiber Coupler

作者单位
1 Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
2 Sensors and Composite Group, Engineering System Department, Royal Military College of Science, Cranfield University, Shrivenham, Swindon, SN6 8LA, UK
摘要
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.

CHEN Rongsheng, LIAO Yanbiao, ZHENG Gangtie, LIU Tongyu, Gerard Franklyn Fernando. A Novel Acoustic Emission Fiber Optic Sensor Based on a Single Mode Optical Fiber Coupler[J]. Chinese Journal of Lasers B, 2001, 10(3): 195. CHEN Rongsheng, LIAO Yanbiao, ZHENG Gangtie, LIU Tongyu, Gerard Franklyn Fernando. [J]. 中国激光(英文版), 2001, 10(3): 195.

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