THE ELECTRICAL NOISE LEVEL OF THE HYDROPHONE AND ITS DRIFT WITH THE CHANGED OF THE ENVIRONMENT PARAMETERS

The aim of the paper is to show the drift of the electrical noise level of the hydrophone NAXYS, model Ethernet 02345 during a long time period, about 1 year, and find some relations between the hydropne's drift and the changed of the environment parameters. This article is centred in the electrical noise of the hydrophone located in its work field, in this case the marine environment. The hydrophones are specialized equipment to measure the sound pressure in water. The hydrophone detect the pressure variation created by a source and generates an electrical signal. The source creates a sonic wave that travels to the water and irs detection consist in the pressure variation. The hydrophones are equipment composed by different elements but the hydrophone has always a transducer, the most use are the piezoelectric.