Process and apparatus for measuring the brightness of mill-commi

Details Process and apparatus for measuring the brightness of mill-commi Process and apparatus for measuring the brightness of mill-commi

1979-03-30

1981-04-07

McGraw, Vincent P.

Optics: measuring and testing

Of light reflection

By comparison

356323, 356425, G01N 2155

Patent

active

042602637

ABSTRACT:
Process and apparatus for measurement of brightness of milled products, especially flour, are disclosed. The process is of the general type in which the surface of a layer of flour is illuminated, and the returned quantity of light is taken to an optical electrical transducer. A light source is used for illumination, and the light beam is optically decomposed into at least two part-beams (reference beam and measurement beam) for transmission to the transducer. At least one of the part-beams is cyclicly interrupted or broken into two essentially time-shifted measurement phases in such a way that of the two part-beams, only one of the two-part beams will strike the transducer during a first measurement phase, and during a second measurement phase at least the other part-beam will be applied to the transducer. The output signals of the transducer are taken to a memory which intermediately stores the output signals of one measurement phase until the output signals of the following measurement phase appear, so that both output signals can be taken simultaneously to an evaluating device for determination of the relative brightness value of the measurement beam in comparison to the reference beam.

REFERENCES:
patent: 3488122 (1970-01-01), Roussopoulos
patent: 3684378 (1972-08-01), Lord
patent: 3780299 (1973-12-01), Bock
IBM Tech. Disc. Bull., vol. 14, #6, (Nov. 1971), pp. 1868-1869.

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