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.
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。
The merit with the use of cylindrical grating is that, it increases the measuring depth compared with ordinary Moire topography.
与一般的莫尔等高法的照片比较，采用柱面光栅的优越性在于增加了检测深度。
The merit with the use of cylindrical grating is that, it increases the measuring depth compared with ordinary Moire topography.
与一般的莫尔等高法的照片比较，采用柱面光栅的优越性在于增加了检测深度。
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