Method for measuring haze in transparencies

Details Method for measuring haze in transparencies Method for measuring haze in transparencies

1984-06-22

1986-11-18

Arnold, Bruce Y.

Optics: measuring and testing

For light transmission or absorption

G01N 2101

Patent

active

046232583

ABSTRACT:
A method of measuring haze in a transparency includes the steps of illuminating a transparency to be measured from one side using a semi-collimated light source disposed in a predetermined angular relationship to the transparency, measuring the illumination (E) falling on a surface of the transparency from the one side thereof, then along a predetermined line of measurement through the transparency using a photometer to measure the veiling luminance (L) within the transparency from another side of the transparency opposite to the one side thereof, and, finally, calculating the haze index of the transparency by solving H.sub.i =L/E.

REFERENCES:
patent: 3639112 (1972-02-01), Poola
patent: 3737665 (1973-06-01), Nagae
patent: 4310242 (1982-01-01), Genco et al.
patent: 4400089 (1983-08-01), Farabaugh

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