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《Acta Optica Sinica》 2017-08
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Nondestructive Testing Method Based on Fiber Couplingand Coherent Detection

He Ning;Luo Xianghong;Zhao Zhonghua;Liao Xin;School of Information and Communication,Guilin University of Electronic Technology;Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing;  
A nondestructive laser detection method is proposed by combining the spatial laser injection into fibers with the coherent detection technique.The transmission characteristics of laser ultrasonic signals and the principle of coherent light detection are analyzed,and the signal processing and noise suppression methods in the nondestructive laser detection are discussed.The experimental system is established based on the laser excitation and detection where the laser injection and polarization-maintaining transmission are the cores,and the human-machine interactive system based on the graphical programming language LabVIEW is the monitoring way.The experimental results show that this system can reduce the influence of background light jitter on signal detection.By controlling the spot diameter and energy,one can obtain the reflection peaks of different ultrasonic signals.The sensitivity and smoothness of the ultrasonic echo signal detection on material defects are improved effectively.The testing method provides a new technique for engineering applications.
【Fund】: 国家自然科学基金(61661016);; 广西无线宽带通信与信号处理重点实验室主任基金(GXKL061507)
【CateGory Index】: TN249
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