Underwater plasma sound source, namely underwater sparker, as a significant application of pulsed discharge in water, has been employed for underwater acoustics and sea oil prospecting. It is necessary to research on the application of underwater plasma sound source as well as the mechanism of initiation of pulsed discharge for guiding the development of plasma sound source. In this paper, experimental system has been designed for study the electrical characteristics of underwater plasma sound source. Two types of underwater pulsed discharge-spark discharge and corona discharge, have been studied. By comparison and summary, we consider that pulsed corona discharge can provide a new design conception for the underwater plasma sound source. The new prototype of underwater sound source based on the pulsed corona discharge has been studied. The current and acoustical signal of the pulse corona discharge under voltages ranging from 2 kV to 4 kV and conductivities of liquid ranging from 325 uS/cm to 20 mS/cm have been measured.
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