Optical densitometer

Details Optical densitometer Optical densitometer

1978-06-08

1980-10-21

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

356223, G01N 2100, G01J 142

Patent

active

042291089

ABSTRACT:
In a preferred embodiment of the present invention, an optical densitometer is provided having an improved output scale resolution. An output scale reading from 0.000 to 4.000, having a resolution to 0.001, is obtained by improved method and apparatus for obtaining the reference operating characteristics for "zero-mode" parameters. An analog reference anode signal is formed by making adjustments in a generally antilogrithmic relationship to the difference between the reference anode signal being generated and the anode signal produced under the zero-mode conditions. The antilogrithmic relationship improves scale resolution near the zero point and increases densitometer stability during a subsequent measurement cycle. The combination analog reference anode signal generating circuit and an improved exponential characteristic selection circuit enables the improved output resolution and accuracy to be obtained. The exponential characteristic selection circuit enables the measurement circuitry to be adjusted in accordance with the actual photomultiplier tube in the circuit to produce and maintain a measurement having an improved accuracy.

REFERENCES:
patent: 3765776 (1973-10-01), Bravenec

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