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.
Stability is guaranteed with advanced composite sensor construction to give strength and immunity to thermal effects.
Today's surface mount pcb technology and powerful processors allow the sensor to use a circuit just half the size of a credit card.
The sensor is now available in a variety of products to suit many applications. Choose from miniaturised OEM types for installation on ROV's, A V's, transponders and the like, through hand held instruments for calibrating echosounders on small boat surveys, to full ocean depth profiling systems.
A standard feature of all Valeport's top of the range products is synchronised sampling, and nowhere is it more appropriate than a Sound Velocity Profiler. Not only do you start with the most accurate sensor you can buy, but the synchronised
sampling technique means that you measure all the sensors at exactly the same instant, not in sequence. So when the instrument tells you what the sound velocity is at a certain depth, you know it's exactly right. And if you still the need the benefits of a CTD (Salinity and Density data), there's even an instrument that gives you the best of both worlds - CTD sensors and a true sound velocity sensor. You can even add an altimeter, or any other sensor you want. If you need to know the speed of sound, make sure you know it exactly.
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