回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
目的：探索胃肠内容物的声学特性及超声波经过胃肠内容物的衰减规律。
Objective: To research the acoustical quality of gastrointestinal contents and the attenuation criterion of ultrasound passing through gastrointestinal contents.
兆声波清洗是跟超声波相关的一种声学清洗方法。
Megasonic cleaning is a type of acoustic cleaning, related to ultrasonic cleaning.
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