Electronic photometer

Details Electronic photometer Electronic photometer

1978-04-12

1980-06-10

Hille, Rolf G.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307230, 356226, 356223, G01J 142, G06G 724

Patent

active

042075335

ABSTRACT:
An economical Cds photoresistor is connected to the input of an operational amplifier. Logging diodes are connected in a feedback configuration with the operational amplifier through a galvanometer meter. The log of the ratio of the input currents to the operational amplifier is independent of supply voltage thereby permitting the use of a wide tolerance battery supply. The input of the operational amplifier and the meter are referenced to a voltage divider. A feedback connection regulates meter current independently of meter resistance that varies strongly with ambient temperature changes. Light-emitting diodes provide regulation against battery voltage variation, light for meter scale illumination, and an inherent, unfailingly diagnostic battery-check response.

REFERENCES:
patent: 3320530 (1967-05-01), Pearlman
patent: 3448289 (1969-06-01), Harris
patent: 3992622 (1976-11-01), Numata et al.
patent: 4045142 (1977-08-01), Watanabe

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