超声波检测原理
超声波特点：
1.在空气中不能传播，遇到空气100%反射。
2.超声波在行经介质时，若遇到不同密度或弹性系数物质时，即会产生反射回波的特性，而此种反射回波强度会因材料密度不同而有所差异。
超声波检测原理：
Ultrasonic flaw detection defect judgment
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