Measurement of Underwater Noise and VibrationSubacoustech can record and store noise and vibration data so that it can be analysed to yield fundamental quantities of Source Level (i.e. noise radiated by the source) and Transmission Loss (i.e. the rate at which the sound energy decays with range). 
Measurements are taken using a hydrophone deployed from a survey vessel over a range of distances from the source. With these numbers, the level of sound may be estimated at any point in the water. The standards used by Subacoustech for measurement exceed all other standards worldwide that we are aware of. The equipment is able to simultaneously measure underwater sound and vibration over the frequency range from 1 Hz to 175 kHz. At the lower limit, this band includes the components of man made noise, while the upper limit includes those frequencies to which whales and dolphins are mainly sensitive. The noise measuring equipment is able to measure underwater sound at levels below sea state zero or to the extreme levels encountered during underwater blasting. Underwater noise and vibration may need to be measured for a multitude of reasons, and Subacoustech can devise a suitable monitoring regime to meet even the most demanding situations: |