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sound velocity probe
''Note: This page refers to the device used to measure the speed of sound in water for use in hydrography''
A sound velocity probe is a device that is used for measuring the speed of sound, specifically in the water column, for oceanographic and hydrographic research purposes.
== History ==
Early depth sounding was achieved using lead line sounding (or sounding line), where a lead weight attached to a length of rope marked with depth values. As this method was mechanical in nature, the only correction that was applied to the sounding was the reduction of the sounding for tidal height. In the mid 20th century, sonar systems were developed to allow the measurement of underwater distances using the two way travel time of an acoustic pulse. This allowed the surveyor to take many more soundings in a given period of time and was less labor intensive than using a lead line.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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