アレイプローブを利用したレーザ超音波イメージングに関する基礎検討

抄録

Laser ultrasonic testing (UT) uses laser irradiation to generate ultrasonic waves from solid surfaces. In this study, nondestructive imaging is performed using ultrasonic waves generated by laser UT and an array probe for detection. In general, the signal-to-noise (S/N) ratio can be improved by increasing the array element number while appropriately setting the element pitch length. Here, we show a synthetic aperture focusing technique (SAFT) based on ultrasonic transmission from laser irradiation and reception at the array probe. We attempt to enhance the imaging resolution and S/N ratio by increasing the number of laser irradiation points and using both the generated longitudinal and transverse wave modes.