Ballistic optical camera trigger

Details Ballistic optical camera trigger Ballistic optical camera trigger

1995-05-24

1996-12-03

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502141, 250214P, 327 23, 273362, 356 28, 396263, H01J 4014

Patent

active

055810780

ABSTRACT:
A ballistic optical camera trigger having an integrated circuit capable of onverting light to a proportional frequency, wherein the integrated circuit has a fast response time and a wide dynamic range which allows it to sense positive or negative changes in light fast enough to trigger without delay for high speed imaging without computational delays or jitter causing interference. The frequency output of the integrated circuit is tracked by a phase lock loop/voltage controlled oscillator to allow it to follow slow changes in light, but not fast changes in light caused by, for example, a projectile such as a bullet. The frequency output from the integrated circuit is provided to one input of a logic gate which receives at another input thereof, a shaped pulse from the phase lock loop/voltage controlled oscillator circuit, wherein the output of the logic gate is applied to a one-shot for outputting a trigger signal.

REFERENCES:
patent: 3787770 (1974-01-01), Cote et al.
patent: 4128761 (1978-12-01), Oehler
patent: 4385227 (1983-05-01), Bridges
patent: 4418999 (1983-12-01), Baxter
patent: 4535462 (1985-08-01), Schmidt
patent: 4845690 (1989-07-01), Oehler

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