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.
针对KNUDSEN 320M型测深仪的性能特点，介绍了双频测深仪在水深测量中的应用。
In the light of the performance features of KNUDSEN 320M detector, this paper analyzes on the application of double frequency detector in the water-depth measurement.
针对KNUDSEN 320M型测深仪的性能特点，介绍了双频测深仪在水深测量中的应用。
In the light of the performance features of KNUDSEN 320M detector, this paper analyzes on the application of double frequency detector in the water-depth measurement.
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