Light sensing device

Details Light sensing device Light sensing device

1975-12-10

1979-09-18

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

356224, G02B 914, G02B 934

Patent

active

041681258

ABSTRACT:
The sensing device is a light level indicator that comprises a light sensitive element such as a photo resistor, associated detection circuitry and "go" and "no go" indicator lights which determine whether the level of illumination is above or below a predetermined acceptable level for a given area being tested. The device may be constructed with two light sensitive elements one for sensing direct light and the other for sensing reflected light, or alternatively, the device may have only either element. A multi-position switch may also be provided which can be set at any one of a number of different threshold levels. An adapter is used with the device for checking the calibration of the device. This adapter comprises a radioactive source, holder and a mask which is periodically replaced for maintaining the source at a constant light output.

REFERENCES:
patent: 1990361 (1935-02-01), Bailey, Jr.
patent: 3418479 (1968-12-01), Schmitt
patent: 3552862 (1971-01-01), Weinberg
patent: 3703338 (1972-11-01), Breneman
patent: 3724955 (1973-04-01), Takahashi
patent: 3781119 (1973-12-01), Mori

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