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1超声波测厚仪工作原理超声波同声波一样,是一种机械波,是由于机械振动在弹性介质中引起的波动过程。超声波在同一均匀介质传播时,其纵波声速为一常数。超声波从一种介质传播到另一种介质时,在两介质的分界面上会产生反射。测厚仪正是利用超声波的上述特性进行工作的。脉冲反射法测厚示意图如图1所示。从探头发射超声脉冲T穿过探头延迟块到达工件表面时,部分超声波被表面反射形成反射波S,而其余部分则穿过工件被底面反射形成反射波B,反射波B的一部分穿过工件表面和延迟块被探头接收。这样,
1 Ultrasonic Thickness Gauge works Ultrasonic Like sound waves, is a mechanical wave is due to mechanical vibration in the elastic medium caused by fluctuations in the process. Ultrasound waves in the same uniform medium, the longitudinal wave velocity is a constant. Ultrasound propagation from one medium to another medium, the interface between the two media will produce reflection. Thickness gauge is the use of the above characteristics of ultrasound work. Pulse reflection thickness measurement diagram shown in Figure 1. When the ultrasonic pulse T emitted by the probe reaches the surface of the workpiece through the delay element of the probe, part of the ultrasonic wave is reflected by the surface to form a reflected wave S while the rest passes through the workpiece and is reflected by the bottom surface to form a reflected wave B, and part of the reflected wave B passes through the surface of the workpiece And the delay block is received by the probe. such,