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首页> 外文期刊>Photoacoustics >Non-destructive laser-ultrasonic Synthetic Aperture Focusing Technique (SAFT) for 3D visualization of defects
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Non-destructive laser-ultrasonic Synthetic Aperture Focusing Technique (SAFT) for 3D visualization of defects

机译：非破坏性激光超声波合成孔径聚焦技术（SAFT）用于缺陷的3D可视化

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摘要

The Laser Ultrasonic (LU) technique has been widely studied. Detected ultrasonic signals can be further processed using Synthetic Aperture Focusing Techniques (SAFTs), to detect and image internal defects. LU-based SAFT in frequency-domain (F-SAFT) is developed to visualize horizontal hole-type defects in aluminum. Bulk acoustic waves are non-destructively generated by irradiating a laser line-source, and detected using a laser Doppler vibrometer at a point away from the generation. The influence of this non-coincident generation-detection on the equivalent acoustic velocity used in the algorithm is studied via velocity mappings. Because the wide-band generation characteristic of the LU technique, frequency range selections in acoustic wave signals are implemented to increase Signal-to-Noise Ratio (SNR) and reconstruction speed. Results indicate that by using the LU F-SAFT algorithm, and incorporating optimizations such as velocity mapping and frequency range selection, small defects can be visualized in 3D with corrected locations and improved image quality.
机译：激光超声波（LU）技术已被广泛研究。可以使用合成孔径聚焦技术（SAFT）进一步处理检测到的超声信号，以检测和图像内部缺陷。基于LU的频率域（F-SAFT）的SAFT开发用于可视化铝中的水平孔型缺陷。通过照射激光线源，并使用激光多普勒振动计检测到远离生成的点来进行非破坏性地产生散装声波。通过速度映射研究了对算法中使用的等同声速度的这种非重合生成检测的影响。因为LU技术的宽带发电特性，所实现声波信号中的频率范围选择以增加信噪比（SNR）和重建速度。结果表明，通过使用LU F-SAFT算法，并结合诸如速度映射和频率范围选择的优化，可以用校正的位置和改善的图像质量来可视化小缺陷。

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