Apparatus for measuring projectile velocity

Details Apparatus for measuring projectile velocity Apparatus for measuring projectile velocity

1978-12-04

1981-02-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 28, G01P 336

Patent

active

042530202

ABSTRACT:
An apparatus for detecting the passage of a moving object such as a truncated stern projectile includes a laser light screen, a photo sensor, and a signal processor. The intensity signal produced by the photo sensor is processed to generate an output pulse at the instant when the first time derivative of the intensity is greatest. For truncated stern projectiles this occurs when the projectile exits the light screen.

REFERENCES:
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patent: 3495893 (1970-02-01), Geusic et al.
patent: 3524354 (1970-08-01), Frank et al.
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patent: 3695749 (1972-10-01), Stapleton
patent: 3830568 (1974-08-01), Allen
patent: 3865487 (1975-02-01), Andermo
patent: 3989378 (1976-11-01), Heitmann et al.
patent: 4155647 (1979-05-01), Michel
Jenkins et al., "Fundamentals of Optics", 3rd Ed., McGraw-Hill, 1957, pp. 239-240.

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