Method of measuring the amount of substance associated with...

Details Method of measuring the amount of substance associated with... Method of measuring the amount of substance associated with...

G - Physics

01

J

73/57

G01J 3/46 (2006.01) G01N 21/00 (2006.01) G01N 21/31 (2006.01)

Patent

CA 1102579

ABSTRACT OF THE DISCLOSURE 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 abosrption 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.

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