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.
Comments