Method of distinguishing between the front and back surfaces of

Details Method of distinguishing between the front and back surfaces of Method of distinguishing between the front and back surfaces of

1986-10-16

1988-10-25

Anderson, Bruce C.

Optics: measuring and testing

Of light reflection

356429, 250571, 250572, G01N 2186

Patent

active

047799889

ABSTRACT:
A method of distinguishing between the front and back surfaces of a slide which includes an image on the front surface, comprises reflecting a light beam from each surface of the slide at an acute angle, measuring scattered light around the reflected light beam after the light beam has been reflected repeatedly, and comparing the measurements of the scattered light for the respective surfaces of the slide to detect which of the two measurements is larger. The surface whose measurement is larger is thus determined to be the front surface of the slide.

REFERENCES:
patent: 2604809 (1952-07-01), Mitchell
patent: 4184082 (1980-01-01), Peoples
patent: 4284356 (1981-08-01), Heilman
patent: 4456374 (1984-06-01), Langburg

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