一、前言超声波无损探伤技术,在工业上应用广泛。其工作原理简单,是先将超声波传送到被检测零件,然后检测超声波入射到零件壁上或壁内缺陷后反射的回波。但有一个难以克服的缺点,需要在被检测零件和用来传输和截获超声波的变送器之间使用联结媒质。这样,被检测零件和超声波变送器需浸入水箱内,“扫描”被检测零件表面。如果因为零件特大或不能搬动而不能浸没,通常是用刷子往零件上刷液体和用手移动超声波探头。这样一来就不能连续检查流水作业线上的零件。美国Harry Diamond Laborat- First, the foreword Non-destructive ultrasonic flaw detection technology, widely used in industry. Its working principle is simple, is the first ultrasound transmitted to the detected parts, and then detect the ultrasonic incident on the wall or wall defects reflected echo. However, there is an insurmountable disadvantage that requires the use of a bonding medium between the part under test and the transmitter used to transmit and intercept the ultrasound. In this way, to be tested parts and ultrasonic transmitters need to be immersed in the tank, “scan” to be detected parts surface. If it can not be submerged due to large or unmovable parts, it is common practice to brush the part with liquid and move the ultrasonic probe by hand. As a result, you can not continuously check the parts on the assembly line. United States Harry Diamond Laborat-