Optics: measuring and testing – Infrared and ultraviolet
Patent
1980-03-12
1982-03-23
McGraw, Vincent P.
Optics: measuring and testing
Infrared and ultraviolet
250339, 356 73, 356382, 356429, G01N 2186, G01B 1106
Patent
active
043209670
ABSTRACT:
The apparatus employs two or more beams of radiation of different spectral composition which are transmitted through a sample and received by a detector which provides signals for computing the required parameter by ratio measurements. The beams are directed to a sample zone where a part is transmitted through, and a part is reflected by a sample. The invention provides diffusing means to receive the transmitted and reflected parts and pass the same onto a radiation responsive detector. The diffusing means may be a ground glass plate or a member made of fused alumina. A concave mirror may be used to reflect the reflected part back through the sample zone which is close to or at the center of curvature of the mirror. A beamsplitter may also be used so that the beams are directed substantially normal to a plane in the sample zone.
REFERENCES:
patent: 3455637 (1969-07-01), Howard
patent: 3793524 (1974-02-01), Howarth
patent: 3854044 (1974-12-01), Stay et al.
patent: 4027161 (1977-05-01), Williams et al.
Infra-Red Engineering Ltd.
McGraw Vincent P.
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