Optics: measuring and testing – For light transmission or absorption
Patent
1979-03-01
1980-12-02
Corbin, John K.
Optics: measuring and testing
For light transmission or absorption
G01N 2101
Patent
active
042368260
ABSTRACT:
An apparatus for measuring an optical property of an object such as its optical density, is disclosed. The apparatus comprises a light flash source, a photodiode coupled to a current-voltage transducer, a reference voltage source, a voltage comparator for comparing the reference voltage and voltage of the transducer, and a clock pulse generator and pulse counter triggered by the light flash source. The comparator compares the voltage from the transducer and the reference source, and disables the counter when the transducer voltage level drops below the reference voltage level. The apparatus relies upon the fact that the intensity of light emitted by the light source decays as a function of time, including a region where the intensity decays in an exponential function of time. By appropriate selection of the apparatus component parameters, the apparatus will produce a data response equal to the optical density without the need for additional logarithmic conversion circuitry.
Additional novel features and improvements are disclosed.
REFERENCES:
patent: 1167045 (1916-01-01), Cade et al.
patent: 3528749 (1970-09-01), Bowker
patent: 3994601 (1976-11-01), Brugger
Arnold Bruce
Corbin John K.
Minolta Camera Kabushiki Kaisha
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