ultrasonic echo sounder
ultrasonic driller超引起听觉的振动波钻机 ultrasonic echo sounder超声回波测深仪 ultrasonic echo-impulse digital thickness meter超声回波脉冲数码式测厚仪 ..
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超音波回声测深仪 supersonic echo sounder
超声波回声测深仪 supersonic echo sounder
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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.
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