Target apparatus
First Claim
1. Target apparatus, comprising:
- a framework;
at least one sheet of material, capable of being penetrated by a projectile, covering said framework to form a chamber;
a plurality of transducers for detecting shock or pressure waves in said chamber caused upon penetration of said at least one sheet of material by said projectile, said transducers being positioned at respective spaced-apart locations within said chamber and lying on only a portion of an arc of a circle lying in a region where said transducers are protected from being hit by said projectile;
means responsive to said transducers for measuring time differences between instants of detection of a shock or pressure wave by said transducers; and
means responsive to said time difference measuring means for determining and indicating a location at which said projectile penetrated said at least one sheet of material.
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0 Petitions
Accused Products
Abstract
A target apparatus, having a framework covered by sheets of material to form a chamber the sheets of material being penetrable by a projectile, such as a bullet, fired at the target. A plurality of transducers are positioned at respective spaced-apart locations within the chamber and lying on an arc of a circle, for detecting shock or pressure waves in the chamber caused upon penetration of the sheets of material by the projectile. Time differences between instants of detection of a shock or pressure wave by the transducers are measured, the location at which the projectile penetrated the sheet of material being determined from the time differences. Preferably, a bull'"'"'s-eye or aiming mark is provided on the target, the center of which is aligned with the center of the circle on which the transducers lie. Apparatus is also disclosed for determining the speed of sound in air within the chamber, enabling the projectile penetration point to be determined with particular accuracy.
496 Citations
24 Claims
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1. Target apparatus, comprising:
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a framework; at least one sheet of material, capable of being penetrated by a projectile, covering said framework to form a chamber; a plurality of transducers for detecting shock or pressure waves in said chamber caused upon penetration of said at least one sheet of material by said projectile, said transducers being positioned at respective spaced-apart locations within said chamber and lying on only a portion of an arc of a circle lying in a region where said transducers are protected from being hit by said projectile; means responsive to said transducers for measuring time differences between instants of detection of a shock or pressure wave by said transducers; and means responsive to said time difference measuring means for determining and indicating a location at which said projectile penetrated said at least one sheet of material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification