脉冲反射式超声波检测板厚时,因探头与被检件表面之间存在空气,故需在两者间施加适当的耦合剂。耦合剂的施加,以往大都用油壶或毛刷将其滴注或涂抹在被检表面,其缺点是效率低,而且因耦合剂流失,耦合状态不稳定而检测精度不佳。这里提供的改进方法是:在探头上装有积存和吐出耦合剂的机构。当探头操作时,耦合剂吐出机构同时动作,在探头与被检件之间迅速形成耦合层。这样 Pulse reflection ultrasonic testing thickness, due to the presence of air between the probe and the surface of the workpiece, it is necessary to apply appropriate coupling between the two. The application of coupling agent, most of the past with a pot or brush to be instilled or smeared on the surface to be seized, the disadvantage is inefficient, but also because of the loss of coupling agent, the coupling state is unstable and poor detection accuracy. Here are some improvements: The probe is equipped with a mechanism to store and dispense the coupling agent. When the probe operation, the coupling agent discharge mechanism at the same time action, quickly formed between the probe and the test piece coupling layer. such