Method of measuring the amount of reduction of a dot film, and d

Details Method of measuring the amount of reduction of a dot film, and d Method of measuring the amount of reduction of a dot film, and d

1979-04-09

1981-05-12

McGraw, Vincent P.

Optics: measuring and testing

Infrared and ultraviolet

250394, 356244, 356443, G01J 348, G01N 2101, G01N 2107

Patent

active

042668727

ABSTRACT:
A dot film is irradiated by light, so that the quantity of light in the long wavelength region and the quantity of light in the short wavelength region are obtained from the light passed through the dot film. The amount of reduction of the dot film is calculated from the difference between the two quantities of light, and is displayed on a display section.

REFERENCES:
patent: 3306156 (1967-02-01), Glasser et al.
patent: 3586441 (1971-06-01), Smith et al.
patent: 3827808 (1974-08-01), Cho
patent: 3887281 (1975-06-01), Kurita et al.
patent: 4080075 (1978-03-01), Berg

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