Device for measuring light intensity received by a photosensor

Details Device for measuring light intensity received by a photosensor Device for measuring light intensity received by a photosensor

1987-12-24

1989-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356224, H01J 4014

Patent

active

048474835

ABSTRACT:
A device for measuring the intensity of light received by a photosensor comprises a photosensor for receiving light and producing a corresponding current and a circuit for integrating the current so that the intensity of the received light is indicated as the time required for the integration value of the integrating circuit to reach a predetermined value. If the intensity of the light is determined to be high at the start of the integration operation the integration value is set to the smaller of two predetermined values. If the intensity of the light is low, the integration value is set to a larger value.

REFERENCES:
patent: 4203668 (1980-05-01), Chapman
patent: 4465370 (1984-08-01), Yuasa et al.
patent: 4666301 (1987-05-01), Gruenke

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