Electricity: measuring and testing – Electrical speed measuring – Including 'event' sensing means
Patent
1984-05-11
1986-03-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Including 'event' sensing means
2502221, G01P 366, G01P 380
Patent
active
045742383
ABSTRACT:
An apparatus for measuring the speed of a projectile fired from a handgun or small arm has a measuring path, over which the projectile passes, with light gates disposed spaced apart from one another. Each light gate has a light responsive element, which is shielded from the projectile path by a screen containing a light admitting aperture. An electronic signal evaluation circuit processes the signals emitted by the two light responsive elements in accordance with the darkening of the apertures caused by the projectile in flight above them and supplies these signals to a display device. In order to reduce to a minimum the danger of damage to the apparatus or of harm to persons, caused either by the projectile itself or by parts broken off the apparatus by the projectile without providing a connection between the barrel of the gun and the measuring apparatus, the arrangement is selected such that the two light responsive elements are disposed behind a separating wall common to both. The separating wall includes the light admitting apertures and acts as a screen. It is aligned substantially parallel to the projectile path and extends from near the muzzle of the weapon to beyond the second light responsive element, that is, the one disposed most remotely from the muzzle, and this separating wall protects the light responsive elements from the projectile.
REFERENCES:
patent: 3811091 (1974-05-01), Ha et al.
patent: 4128761 (1978-12-01), Oehler
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