To realize a fully noncontact ultrasonic testing method for inner cracks inspection in thick metal specimen, a phased array laser ultrasonic testing system with using a compact optic fiber array bundle and a laser interferometer is developed in this study. The focusing and steering of the shear wave and longitudinal wave generated with seven fiber-phased-array laser sources in thermoelastic regime is investigated by a numerical simulation and validated by the experiment. A non-contact measurement of the inner-surface cracks by both the angle-beam testing method and time-of-flight diffraction method with the fiber-phased-array laser ultrasonic technique have been studied.

为了实现一种用于厚金属试样内部裂纹检查的完全非接触式超声测试方法，本研究开发了一种使用紧凑型光纤阵列束和激光干涉仪的相控阵激光超声测试系统。通过数值模拟研究了七个光纤相控阵激光源在热弹性状态下产生的剪切波和纵波的聚焦和转向，并通过实验验证了这一点。研究了利用相控阵激光超声技术通过角束测试法和飞行时间衍射法对内表面裂纹进行非接触式测量。