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Hybrid laser ultrasonic inspection based on optical fiber technique

Chinese Optics Letters 2014年第A1期12卷 69-70页

作者：赵扬崔雷孙继华马健贾中青 Laser Institute of Shandong Academy of Sciences Jinan 250014 China Shandong Academy of Sciences Jinan 250014 China

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 non- destructive assessment of metallic materials.

关键词： 110.5125 Photoacoustics 170.1065 acousto-optics 220.4840 Testing 070.1060 acousto-optical signal processing

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Hybrid laser-EMAT system for non-destructive testing continuous casting billet

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Chinese Optics Letters 2013年第14期11卷 56-58页

作者：赵扬刘帅郭锐马健宋江峰孙继华贾中青 Laser Research Institute of Shandong Academy of Sciences Jinan 250014 China

A novel laser-electro magnetic acoustic transducer （EMAT） system for nondestructive testing NDT surface crack of continuous casting billet （CCB） is provided. Rayleigh wave generated by line laser source is used to detect the surface crack of CCB. According to the principle of mode conversion from Rayleigh wave to shear wave, the defect signal is received using the shear wave EMAT sensor in a non-contact way. Experiments are carried out on the steel sample with size 30 × 0.2 ×0.2 （mm） of crack. Further, the influences of life off value and distance between EMAT sensor and laser beam on the testing sensitivity are discussed, respectively. It is found that the life off value is the main factor that effects sensitivity of the proposed method. There is a clear prospect of the method applied to test continuously cast bloom at high temperature.

关键词： 110.5125 Photoacoustics 170.1065 acousto-optics 220.4840 Testing 070.1060 acousto-optical signal processing

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Monitoring the Laser Ablation Process of Paint Layers by PILA Technique

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Open Journal of Applied Sciences 2016年第9期6卷 626-635页

作者： Angel Eduardo Villarreal-Villela L. Ponce Cabrera Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Altamira Altamira México

The spectrum analysis obtained by Fast Fourier Transform of the Photoacoustic In-duced by Laser Ablation (PILA) during laser assisted paints removal process is de-scribed, in order to identify the presence of paint components on a metallic surface, optimize the ablation rate and propose the method as a cleaning process monitoring. The process was carried out using a low-cost experimental setup which includes a burst-mode Nd:YAG laser, an electret microphone, an audio amplifier device and an oscilloscope, to record the acoustic pulse and analyze it. The samples surface mor-phology was characterized by optical Microscopy and optical Coherence Tomography (OCT) before and after irradiation to visualize the formation of craters. As additional monitoring technique, the Laser Induced Breakdown Spectroscopy (LIBS) was used. The potential of the analysis for qualitative monitoring of coating removal was demonstrated due to the coincidence of the information provided by LIBS and PILA techniques.

关键词： Laser Induced Breakdown Spectroscopy Pulsed Laser Nd:YAG acousto-optical signal processing

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