Apparatus for measuring reflectivity which is tolerant of backgr

Details Apparatus for measuring reflectivity which is tolerant of backgr Apparatus for measuring reflectivity which is tolerant of backgr

1985-04-12

1987-03-03

LaRoche, Eugene R.

Optics: measuring and testing

Of light reflection

With modulation

G01N 2155

Patent

active

046472118

ABSTRACT:
An apparatus for measuring the reflectivity of a product for use in optical sorting machines that is tolerant of background and product trajectory variations. The apparatus computes the percent of the viewing frame filled by the product at any instant as well as the reflectivity of the background when no product is present. The reflectivity at selected wavelengths from selected perspectives is computed for a product as the product passes a viewing frame by correcting for frame fill and background factors. Given an estimate of product velocity, product size may also be estimated.

REFERENCES:
patent: 4037970 (1977-07-01), Webster et al.
patent: 4235342 (1980-11-01), Braham
patent: 4262806 (1981-04-01), Drabs
patent: 4280625 (1981-07-01), Grobbeloar et al.
patent: 4344539 (1982-08-01), Lockett

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