Optical sensor for volatile organic compounds

Details Optical sensor for volatile organic compounds Optical sensor for volatile organic compounds

G - Physics

01

N

G01N 21/41 (2006.01) G01N 21/55 (2006.01) G01N 21/77 (2006.01)

Patent

CA 2423512

An optical sensor for volatile organic compounds includes a light transmission medium and a porous medium, having an interface therebetween. A light source directs a beam of light into the light transmission medium at an incidence angle with respect to the interface. A detector is provided for measuring an intensity of light reflected by the interface or transmitted by the porous medium. The light transmission medium and the porous medium have different mediums of refraction to creates a total internal reflection condition. The condition is gradually deteriorated as the porous medium is exposed to volatile organic compounds, since the adsorption of the compounds modifying the index of refraction of the porous medium.

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