在工业生产中，利用超声波进行固体或液体中的距离测量十分普遍，尤其是小距离、微距离测量（如测厚、粗糙度、液位等）。
Application in ultrasonic rang in solid and liquid is in industry production very widespread, especially in micro-rang and short-rang, for example, thickness, roughness, liquid level.
在工业生产中，利用超声波进行固体或液体中的距离测量十分普遍，尤其是小距离、微距离测量（如测厚、粗糙度、液位等）。
Application in ultrasonic rang in solid and liquid is in industry production very widespread, especially in micro-rang and short-rang, for example, thickness, roughness, liquid level.
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