Light absorptivity measuring device

Details Light absorptivity measuring device Light absorptivity measuring device

1979-06-14

1981-08-04

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

356433, 356425, 356448, G01J 350

Patent

active

042819326

ABSTRACT:
A light source is arranged with a light sensing device in such a way that the sensing device receives transmitted light for a translucent medium or reflected light for an opaque medium. The reading of the sensor is stored, then the same source and sensing device are moved over a reference medium whose absorptivity varies unidirectionally. A comparator compares the reading of the sensor with the stored reading and indicates when they are equal. The relative position of the reference and sensor indicates the absorptivity of the medium. One embodiment uses multiple devices and filters to determine composite color.

REFERENCES:
patent: 3661462 (1972-05-01), Natens

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