Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-09
1993-08-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356435, G01N 2186
Patent
active
052351920
ABSTRACT:
A sensor and method is provided for measuring one or more select components of a material. In one embodiment, a method measures the components by emitting electromagnetic radiation at the material and detecting the intensity of the emerging radiation at separate locations from the source. In another embodiment, a sensor provides a radiation source for emitting radiation at a sheet, a plurality of detecting means, wherein at least one detecting means is offset from the source, for detecting radiation after interaction with the sheet and first and second reflectors for directing the radiation so that the radiation makes multiple interactions with the sheet when moving from the source to the detecting means. The invention can accurately measure the select components (e.g., moisture) of different grades of paper by eliminating the effects of the scattering power and determining absorption power at each band of the spectrum considered necessary for a particular measurement.
REFERENCES:
patent: 3827808 (1974-08-01), Cho
patent: 4319847 (1982-03-01), Howarth
patent: 4743775 (1988-05-01), Edgar
Anderson Leonard M.
Chase Lee M.
Norton Michael K.
Le Que T.
Measurex Corporation
Nelms David C.
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