Umbra/penumbra detector

Details Umbra/penumbra detector Umbra/penumbra detector

1986-11-24

1988-10-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356375, G01D 534

Patent

active

047773600

ABSTRACT:
A device which monitors the characteristics of an image cast upon a radiation sensitive substrate. This includes a shadow casting object or mask and at least one source of radiation disposed above the object or mask so that the image cast on the substrate can be analyzed.

REFERENCES:
patent: 31143 (1883-02-01), Kaye et al.
patent: 4008391 (1977-02-01), Henderson, Jr.
patent: 4019173 (1977-04-01), Kono
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4281342 (1981-07-01), Ueda et al.
patent: 4335962 (1982-06-01), DiMatteo et al.
patent: 4435837 (1984-03-01), Abernathy
patent: 4522494 (1985-06-01), Bonner
patent: 4574199 (1986-03-01), Pryor

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