Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1979-04-27
1981-12-15
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250359, G01J 100, G01N 2300
Patent
active
043061516
ABSTRACT:
A method of measuring the amount of substance associated with a material in the presence of a contaminant comprises choosing a first band of radiation which lies outside the absorption band of the substance but within the absorption band of the contaminant. The first band is directed at the material; a first detector is positioned to receive the radiation after impinging the material. The first detector converts the radiation received into a first electrical signal. A second band of radiation, which is chosen to lie within the absorption band of the substance, is also within an absorption band of the contaminant. The second band is directed at the material; a second detector is positioned to receive the radiation after impinging the material. The second detector produces a second electrical signal in response to the radiation received. The second electrical signal is subtracted from the first electrical signal.
REFERENCES:
patent: 3641349 (1972-02-01), Dahlin
patent: 3675019 (1972-07-01), Hill et al.
patent: 3793524 (1974-02-01), Howarth
patent: 3870884 (1975-03-01), Williams
Bohner Hal J.
Howell Janice A.
Measurex Corporation
Smith Alfred E.
Yin Ronald
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