利用超声波测定弹性模量，对材料的损伤很小而且测量精度高，颇适合于作为陶瓷和金属材料的检测技术。为了根据纵波音速与横波音速来获得弹性模量，进行精密的音速测定是这一检测技术的重要课题。这里所介绍的测定方法的基础，是使用脉冲激光器来激发超声波，并通过激光干涉仪 The use of ultrasonic measurement of elastic modulus, small damage to the material and high measurement accuracy, is quite suitable as a ceramic and metal detection technology. In order to obtain the elastic modulus according to the compressional and shear wave velocities, accurate sonic velocity measurement is an important issue in this detection technique. The measurement method described here is based on the use of a pulsed laser to excite the ultrasound and to measure it by a laser interferometer