Sound propagation studies of some implosive sources
A series of about 40 small (2-in. diam) inexpensive (approx. $70 per thousand) plastic spheres was sunk and thus imploded at sea near Westfall Seamount (30.5$ N, 120.5$ W). the implosive signals were monitored on both shallow (50-ft) and deep (1,100-ft) hydrophones, suspended from the ship. Three types of spheres were tested and found to implode at 1,800-, 2,350-, and 2,680-ft depths, respectively. Sink rates of 225 to 300 ft/min. were achieved using sections of pipe, or other hardware, as sinkers. Energy per unit area spectrum levels in the 0.5- to 5-kHz frequency band were, for one type of hydrosphere having an average implosion depth of 2,680 ft, comparable to those for a 0.002-lb detonator (TNT). Use of such safe, inexpensive, and reliable implosive devices is recommended for acoustic work at sea when short pulses of relatively low signal strength are required.
- Research Organization:
- US Navy
- OSTI ID:
- 5771023
- Report Number(s):
- CONF-701165-
- Journal Information:
- J. Acoust. Soc. Am.; (United States), Vol. 49:1; Conference: 80. Acoustical Society of America meeting, Houston, TX, USA, 3 Nov 1970
- Country of Publication:
- United States
- Language:
- English
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