Accession Number:

AD0259947

Title:

ELECTRO-ACOUSTIC PROPERTIES OF THE UNDERWATER SPARK DISCHARGE

Descriptive Note:

Corporate Author:

EDO CORP COLLEGE POINT NY

Personal Author(s):

Report Date:

1961-06-01

Pagination or Media Count:

78.0

Abstract:

An investigation was made of the underwater spark discharge as a means of converting electrical to acoustic energy. The medium is a fundamental part of the transduction process. An underwater spark discharge is formed by switching an energy storage capacitor at a high voltage to a pair of submerged electrodes. An ionized plasma at high temperature and pressure is formed between the electrodes. The pressure within the plasma is transmitted to the surrounding water as a wave of compression similar to the shock wave created by an underwater explosion. An analysis of the electro-acoustic properties of the underwater spark is presented. The sonic energy radiated from the underwater spark discharge is discussed, and the directional properties of the radiated pressure are derived. Properties of the underwater spark discharge plasma as a circuit element are investigated. An electrical equivalent for the discharge circuit is developed from a knowledge of the variation of channel area with time. The theoretical results are compared with experimental ones for a fresh water underwater spark discharge.

Subject Categories:

  • Acoustic Detection and Detectors
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE