本文概述了几种非接触接收超声的光学检测方法的基本原理和实验装置,就有关结果论证它们在无损检测方面的重要作用。测量材料表面缺陷的位置和大小是无损检测中相当令人感兴趣的问题。声波的时域反射法已被用来确定缺陷的位置和大小,在这种方法中压电换能器激发一个短脉冲,从缺陷反射的回声由一个换能器来测量,反射信号的幅度给出关于缺陷截面的信息。由 This paper presents an overview of the basic principles and experimental setups of several non-contact, ultrasonic-based optical inspection methods that demonstrate their important role in non-destructive testing. Measuring the location and size of material surface defects is of considerable interest in non-destructive testing. Time domain reflectometry of acoustic waves has been used to determine the location and size of defects in which the piezoelectric transducer excites a short pulse and the echo reflected from the defect is measured by a transducer which reflects the amplitude of the signal Information about the defect section. by