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
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.