There are many factors that can affect the Measurement of the Speed of Sound in Seawater, the key influencers being temperature and pressure or density. These variables can alter considerably depending on the location at which the measurement is being conducted.
Sound Velocity Sensors
There is a wide range of Oceanographic Instruments available to accurately measure the speed of sound in seawater and Valeport (one of the UK's leading manufacturers of Hydrographic and Oceanographic Equipment) can offer a number of solutions, both lowered and through the hull, here are just some of them:
MIDAS Sound Velocity Profiler
Simultaneous sensor sampling and the incorporation of a world-leading digital time of flight sound speed sensor ensures this device provides the most accurate Sound Velocity Profiles currently possible. Titanium construction and a large memory make it suitable for rapid profiling down to 6000m depth.
A great hybrid device offering the Superior Sound Velocity Data combined with leading-edge Salinity and Density measurement, this unit offers the best of both worlds. It also has a 0.01% pressure sensor as standard and utilises synchronised sampling to ensure perfect profiles.
Featuring Valeport's unique acclaimed "time of flight" SV sensor, a single C cell and large Flash memory allow hundreds of profiles to be recorded. It has pre-programmed profiling patterns that allow it to be configured and deployed quickly and easily. This MiniSVP is available in either 500m rated acetal or 6000m rated titanium versions and represents great value for money for those on a limited budget.
Lowest noise, highest accuracy, best resolution sound velocity data available. It's small size and a choice of sensor lengths down to just 25mm make the sensor suitable for a variety of applications. This unit is also considered suitable for OEM and custom designs.