超声波检测

        ULTRASONIC TESTING （UT）

■检测原理:由探头中的压电品片发射脉冲超声波，通过声耦合介质传播到工件中，遇到缺陷后产生反射波，然后再用另一个或同一个探头接收反射波，经换能器转换成电信号，并显示在荧光屏上，通过对反射波信号的分析，可判断缺陷的大小、位置和性质。

Principle:Pulsed ultrasonic waves are emitted from thepiezoelectric wafer in the probe, propagate into the workpiecethrough the acoustic coupling medium, and reflected wavesare generated after encountering the defects, and thenreceive a reflected wave with another or the same probe.convert it into an electrical signal by a transducer, and displayit on a fluorescent screen.lt can be judged the size, location,and nature of the defects by analyzing the reflected wavesignal.

■适用的检测对象:金属材料、复合材料和焊缝。Appliction: metal materials, composite materials and welds.

■优点:适宜检验厚度较大的工件;对面积型缺陷的检出率较高;适宜现场检测。

Advantages:It is suitable to inspect the workpieces with largethickness; the detection rate of area-type defects is high; lt issuitable for on-site inspection.