Electricity: measuring and testing – Electrical speed measuring – Including 'event' sensing means
Patent
1977-01-12
1978-06-27
Rolinec, Rudolph V.
Electricity: measuring and testing
Electrical speed measuring
Including 'event' sensing means
250222R, G01P 366
Patent
active
040978001
ABSTRACT:
A light screen device for measuring the velocity of a projectile comprising laser disposed opposite to one end of a first plane reflecting mirror and inclined with respect thereto to cause a laser beam to strike the first plane reflecting mirror and in turn to reflect the beam to a second plane mirror and successively reflecting the beam back and forth vertically to higher points on each mirror surface forming a criss-cross rectangularly shaped light grid network therebetween. A light detector is disposed axially in line with a reflected beam to intercept and detect the continuing presence thereof and to generate a pulse signal in response to the projectile passing through the light screen to stop a counting circuit.
REFERENCES:
patent: 3025406 (1962-03-01), Stewart et al.
patent: 3500063 (1970-03-01), Reno et al.
patent: 3584226 (1971-06-01), Lerner
Bubb Gary E.
Kuchmas, Jr. John
Edelberg Nathan
Erkkila A. Victor
Rolinec Rudolph V.
Sunderdick Vincent J.
The United States of America as represented by the Secretary of
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