Measurement apparatus for optical transmission factor

Details Measurement apparatus for optical transmission factor Measurement apparatus for optical transmission factor

1986-12-24

1988-02-23

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

By comparison

350394, 350173, 356437, G01N 2159

Patent

active

047266848

ABSTRACT:
An optical transmission factor is measured by using mutual measuring technology having a pair of identical units (44, 50) located on opposite sides of an object (A). Each of said units (44, 50) comprises a pair of beam splitters (47, 48), a light source means (45, 46) for illuminating an object (A) through a first beam splitter (47) and providing offset beam (56) from said first beam splitter (47), a photo-detector (49) for converting optical power from the other unit (50) and said offset beam (56), wherein each of said beam splitters (47, 48) is substantially in parallelogram shape with two pairs of confronting planes (24, 25; and 22, 23), first pairs of planes (24, 25) are not perpendicular to the second pair of planes (22, 23), one of first pair of planes (24) is mirror coated for reflecting the inside beam, so that split beams (29, 31) from single beam (27) share a common point (200) on the plane ( 23). Thus, a dust/soil free measurement with no mechanically moving means is accomplished.

REFERENCES:
patent: 3872315 (1975-03-01), Boll

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