Accession Number : AD0636168

Title :   UNDERWATER ELECTRODELESS SPARK SOUND SOURCE.

Descriptive Note : Annual technical rept.

Corporate Author : AVCO CORP LOWELL MASS AVCO SPACE SYSTEMS DIV

Personal Author(s) : Wright,Hubert A. , Jr

Report Date : 20 JUL 1966

Pagination or Media Count : 69

Abstract : The electrodeless spark principle involves the generation of an underwater electric spark in the orifice of a dielectric barrier which separates two volumes of sea water. Research on impulse sound generation by such a principle is described which shows that the electrodeless spark discharge can be typified as: (1) Extremely reproducible (2) Capable of routine generation of peak pressures corresponding to 134 db/micro b at 1 yard (3) Pulse lengths of 50 microsec (4) Extremely precise time of ignition (5) Suitable for arrayed operation, i.e. no interaction between elements which are electrically paralleled. (6) A potential to suppress, and presumably to essentially eliminate, the secondary collapse, or bubble pulse (7) Essentially omnidirectional except in some configuration. The dynamic equations of motion of a spherical bubble are discussed and aspects developed which are pertinent to the electrodeless spark dynamics. Parametric surveys of the electrodeless spark discharge are summarized, and device design and contruction are described. (Author)

Descriptors :   (*UNDERWATER SOUND GENERATORS, SPARKS), ORIFICES, DIELECTRICS, SEPARATION, IGNITION, BUBBLES, DESIGN, ELECTRIC DISCHARGES

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE