无损检测(NDT)是一门应用技术学科。光学方法和其它超声、射线、磁学等方法相比,应用不很广泛.光学方法的优点是灵敏度高,大多都是非接触式的.缺点是抗环境干扰能力差,分析信息的程序复杂,不利于在工作现场使用.然而,伴随着图像处理系统、计算机系统和纤维光学等新技术的发展。将光学无损检测方法向实用化推进了一大步。在光学方法中,干涉法检测、光学成像检测和红外检测技术等,在 NDT 中发挥越来越大的作用。特别是因激光的出 NDT is an applied technology discipline. Compared with other ultrasonic, ray and magnetic methods, optical methods are not widely used.The advantages of optical methods are high sensitivity and most of them are non-contact.The disadvantage is that the ability to resist environmental interference is poor and the procedures for analyzing information are complex and not However, it is accompanied by the development of new technologies such as image processing systems, computer systems and fiber optics. The optical non-destructive testing methods to promote a big step forward. In optical methods, interferometry, optical imaging and infrared detection techniques play an increasing role in NDT. Especially because of the laser out