Chinese Optics Letters, 2014, 12 (s1): S11102, Published Online: Jul. 31, 2014
Hybrid laser ultrasonic inspection based on optical fiber technique Download: 850次
110.5125 Photoacoustics 170.1065 Acousto-optics 220.4840 Testing 070.1060 Acousto-optical signal processing
Abstract
Laser generation and electromagnetic acoustic transducer (EMAT) detection techniques are combined as a hybrid ultrasonic technique for the inspection of the defects in the steel. Laser transmits through the optical fiber and irradiates on the steel surface. In case of inspection, Rayleigh wave is generated to test the surface defects based on the principle of mode conversion. In order to improve the testing accuracy and signal-to-noise ratio, wavelet soft-threshold method is introduced in the present work. Experimental results show that errors of testing surface defect are less than 10%, which proves laser-EMAT technique to be suitable for nondestructive assessment of metallic materials.
Yang Zhao, Lei Cui, Jihua Sun, Jian Ma, Zhongqing Jia. Hybrid laser ultrasonic inspection based on optical fiber technique[J]. Chinese Optics Letters, 2014, 12(s1): S11102.