Storage circuit for photometer

Details Storage circuit for photometer Storage circuit for photometer

1975-10-28

1977-06-07

Corbin, John K.

Optics: measuring and testing

Photometers

Comparison

356188, 356201, 356204, 356205, G01J 110, G01J 345, G01N 2106

Patent

active

040279812

ABSTRACT:
An alternating light photometer, the output of which is connected over two parallel uniform current paths with both of the inputs to a differential amplifier. In each of the paths, there is included in series a resistance, a condenser, with a switch provided as well as between a switch and corresponding input of the differential amplifier, and an operational amplifier, all forming a storage circuit. The R C circuit forms a low pass with a time constant over the given engaging or disengaging time of the beam. The switches are so controlled over the switching circuit that only one of them is closed during the time of the complete release, and the other only during the time of the complete interruption of the beam to the photoelectric transducer.

REFERENCES:
patent: 3684378 (1972-08-01), Lord
patent: 3877812 (1975-04-01), Thompson
patent: 3902812 (1975-09-01), Honkawa
patent: 3917957 (1975-11-01), Ansevin et al.

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