Accession Number : ADD014777

Title :   Acoustic Mine Countermeasures.

Descriptive Note : Patent, filed 9 Dec 63, patented 13 Nov 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kish, Louis A

Report Date : 13 Nov 1990

Pagination or Media Count : 7

Abstract : This patent discloses a mine sweeping method and related apparatus for achieving at least temporary passivation of underwater acoustic influence mines by the generation of particular underwater sounds of progressively increasing intensity. The water is acoustically pulsed by repetitively injecting into the water individual metered slugs of heated water, which water is heated to its saturation pressure but below the critical point. The metered slugs of heated water may be of the same or of progressively increasing size, i.e. weight, and can be released from a heated pressure chamber into the water from either a stationary array or from an array towed from a moving ship, and at a depth such that the expanding bubbles, produced by the change of state of the heated water, do not break the water surface. The rapid expansion of the metered slugs produce the desired sound output for temporarily rendering the acoustic influence mines passive actuating their anti-countermine circuits.

Descriptors :   ACOUSTIC COUNTERMEASURES, ACOUSTIC MINES, ARRAYS, BUBBLES, CHAMBERS, EXPANSION, HEAT, INFLUENCE MINES, MINESWEEPING, MOTION, OUTPUT, PASSIVITY, PATENTS, PRESSURE, PRESSURE VESSELS, SATURATION, SHIPS, SOUND, STATIONARY, SURFACES, TOWED BODIES, UNDERWATER ACOUSTICS, UNDERWATER SOUND, WATER

Subject Categories : Acoustic Countermeasures
      Underwater Ordnance

Distribution Statement : APPROVED FOR PUBLIC RELEASE