Light measuring device

Details Light measuring device Light measuring device

1981-06-30

1984-08-14

Arnold, Bruce Y.

Optics: measuring and testing

Photometers

Photoelectric

324 99D, 340347NT, 356222, G01J 146, G01R 1702, G08C 906

Patent

active

044653700

ABSTRACT:
A light measuring device includes one or more photodiodes, which generate current in relation to the received light, and at least one capacitor for integrating the generated current. The amount of charge stored in the at least one capacitor at the completion of the integration is roughly detected by the number of capacitors used and/or the voltage across the capacitor. A current source capable of producing different levels of current in accordance with the detected amount of charge is provided for changing the amount of charge stored in the at least one capacitor. The time needed to change the amount of charge stored in the at least one capacitor is measured so as to obtain the value of total amount of the change in the charge stored in the at least one capacitor and to thus obtain the value of the received amount of light intensity.

REFERENCES:
patent: 3102921 (1963-09-01), Peras
patent: 4082998 (1978-04-01), Marriott
patent: 4107667 (1978-08-01), Kronlage
patent: 4203668 (1980-05-01), Chapman

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