Sunshield and light diffuser

Details Sunshield and light diffuser Sunshield and light diffuser

1978-10-12

1980-12-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, G06M 700

Patent

active

042399629

ABSTRACT:
In a ballistic velocity measuring device, two photodetectors are spaced apart by an accurately known distance along a projectile path exposed to ambient light from the sky. The invention comprises a sunshield and light diffuser structure for each (or both) of the photodetectors to eliminate light reflection from the projectile which can cancel the "shadow" of the projectile and prevent the photodetector from responding to passage of the projectile; and to increase the level of light to the photodetectors by diffusing direct sunlight.

REFERENCES:
patent: 2294730 (1942-09-01), Eggers
patent: 2442690 (1948-06-01), Hoffman et al.
patent: 3025406 (1962-03-01), Stewart et al.

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