Photodetector circuit for ballistic velocity measurement

Details Photodetector circuit for ballistic velocity measurement Photodetector circuit for ballistic velocity measurement

1977-10-07

1978-12-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324178, G01D 2104

Patent

active

041287614

ABSTRACT:
Light perturbations sequentially produced by a projectile at spaced points are detected by photodetectors connected to a logarithmic diode circuit which is AC coupled to an amplifier time-shared by the detectors. Successive pulses from the amplifier are interpreted by logic circuits to start and stop an interval counter.

REFERENCES:
patent: 3727069 (1973-04-01), Crittenden et al.
patent: 3792354 (1974-02-01), Slaght et al.
patent: 3907429 (1975-09-01), Kuhn et al.

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