Sound Velocity Sensors & Profilers
Sonar, multi-beams, single beams, underwater positioning systems - they all use acoustic signals, and all rely on accurate knowledge of the speed of sound for optimal performance. Estimates can be made from measurement of other parameters (Conductivity, Temperature & Pressure), but the best method is just to measure the speed of sound directly. The Valeport digital time of flight sensor is as good as it gets - state of the art digital signal processing techniques allow us to accurately time a pulse of sound to nearest 10 of a second. The technique is so reliable that even with sound velocities in the region of 1500 m/s, the signal noise from the sensor is just 0.001m/s - that's less than 1 part per million.
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