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Patent No. 5973999 Acoustic cannon

 

Patent No. 5973999

Acoustic cannon (Naff, et al., Oct 26, 1999)

Abstract

An acoustic cannon has a plurality of acoustic sources with output ends symmetrically arranged in a planar array about a central point. Pressure pulses are generated in each acoustic source at substantially the same time. The pressure pulses exit the output ends as sonic pulses. Interaction of the sonic pulses generates a Mach disk, a non-linear shock wave that travels along an axis perpendicular to the planar array with limited radial diffusion. The Mach disk retains the intensity of the sonic pulses for a time and a distance significantly longer than that achievable from a single sonic source. The acoustic cannon is useful as a non-lethal weapon to disperse crowds or disable a hostile target. 

 

Notes:

SUMMARY OF THE INVENTION

Accordingly, it is an object of the invention to provide an acoustic device capable of dispersing or incapacitating a biological target. One feature of the invention is that the device has a planar array of simultaneously actuated acoustic pulse sources. Interaction between the sonic pulses forms a Mach disk. A second feature of the invention is that the device is actuated by either a shock tube or detonation of an explosive chemical mix.

Among the advantages of the invention are that the Mach disk is a compact packet of sound that may be accurately fired to minimize harm to hostages, bystanders and property. The Mach disk effectively incapacitates or disperses a biological target with a minimal threat of lethality. The acoustic device is relatively lightweight and is readily transported by an infantry vehicle and operated by a single person.

In accordance with the invention, there is provided an acoustic cannon that has a plurality of acoustic sources arranged in a planar array about a central point. Each of the plurality of acoustic sources has an input end and an output end. The input end receives a sonic pulse and the output end transmits a sonic output. A sonic pulse generator is coupled to each of the input ends and a timing mechanism is coupled to the sonic pulse generator such that the sonic pulse is received by each of the input ends at substantially the same time and is of substantially the same frequency and duration. The combination of the planar array and the parameters of the sonic output effectively generates a Mach disk.

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It is apparent that there has been provided in accordance with the present invention an acoustic cannon that fully satisfies the objects, means and advantages set forth hereinabove. While the invention has been described in combination with embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the appended claims.

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