Photometer circuit

Details Photometer circuit Photometer circuit

1974-05-09

1976-04-20

Lieberman, Eli

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214R, 250573, 356 40, 356179, 356205, G01J 346, G01N 3316

Patent

active

039522067

ABSTRACT:
The photometer circuit is operative to receive and store a reference voltage which is generated in a photosensor by light which passes through a blank solution in a cuvette and is received at the photosensor. The photometer circuit includes reference voltage input control circuitry for placing the photometer circuit in a receiving and storage mode of operation for a predetermined period of time while the reference voltage is being generated in the photosensor. The photometer circuit includes a comparator having two inputs, a first electronic switch for coupling the output of the comparator to a voltage storage circuit and a second electronic switch for coupling the output of the voltage storage circuit to a voltage run-down circuit.

REFERENCES:
patent: 3566133 (1971-02-01), Dorman et al.
patent: 3622795 (1971-11-01), Dorman et al.
patent: 3703336 (1972-11-01), Rosse et al.
patent: 3752995 (1973-08-01), Liedholz
"Timing Circuit", Hines and Radzik, IBM Technical Disclosure Bulletin, Vol. 6, No. 7, Dec. 1963, pp. 34 and 35.

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