Photometer

Details Photometer Photometer

1975-07-18

1977-08-23

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

G01J 144

Patent

active

040436764

ABSTRACT:
A photometer for measuring the light transparency of a substance. A light beam is provided for illuminating a substance, which light beam passes through the substance and strikes a photoelement and produces a measuring current. The voltage generated from the measuring current is logarithmated by a converter circuit and is supplied to an indicating instrument for indicating a measured value. A zero balance control circuit is provided for controlling the voltage applied to the indicating instrument so that the indicating instrument will return to a value determined by a previous measuring of a calibrated substance. If the transparency of the measured substance is identical to the transparency of the calibrated substance, the indicating device will return to a zero value. A value other than zero will indicate the difference in transparency of the measured substance from the calibrated substance.

REFERENCES:
patent: 3516751 (1970-06-01), Fruengel
patent: 3784912 (1974-01-01), Van Aken
patent: 3801919 (1974-04-01), Wilkes et al.
Jaeger, R. C. and Hellworth, G. A., "Dynamic-Zero Correction Method Suppresses Offset Error in Op Amps", Electronics, Dec. 4, 1972, pp. 109-110.

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