A method and an apparatus for producing a gaseous medium

G - Physics – 01 – N

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G01N 21/33 (2006.01) A61L 2/20 (2006.01) B65B 55/10 (2006.01) G01N 21/27 (2006.01)

Patent

CA 2409424

The invention relates to a method and a system for producing a gaseous medium containing a sterilisation agent and for monitoring and regulating the concentration and quality of the gaseous medium. The method preferably includes concentration determination of a substance or agent in a sample of the gaseous medium in the presence of disruptive matter by means of light absorption, as well as an apparatus therefor. By measuring the light absorbency at two different wavelengths, it is possible to detect and compensate for the effect of disruptive matter such as dust particles, dirt and bubbles (aerosols). By also measuring the intensity of light emitted from the light source which has not yet passed through the measurement sample, simultaneously with the measurements of the absorbency of light allowed through the sample, at each measured wavelength, the actual concentration can be determined with improved accuracy. The method and the system are applied for the sterilisation of packaging materials, packaging containers and packing or filling machines within the food packing industry.

L'invention concerne un procédé et un système destinés à la production d'une substance gazeuse contenant un agent de stérilisation et à la surveillance et la régulation de la concentration et de la qualité de cette substance gazeuse. Ce procédé comporte, de préférence, la détermination de la concentration d'une substance ou d'un agent dans un échantillon de la substance gazeuse en présence de matières perturbatrices par absorbance de la lumière. L'invention concerne également un appareil correspondant. La mesure de l'absorbance de la lumière pour deux longueurs d'ondes différentes permet de détecter et de compenser les effets des matières perturbatrices telles que les particules de poussière, la saleté et les bulles (aérosols). La mesure de l'intensité de la lumière émise par la source lumineuse et n'ayant pas encore traversé l'échantillon de mesure, simultanément aux mesures de l'absorbance de la lumière admise à travers l'échantillon, pour chaque longueur d'onde mesurée, permet de déterminer la concentration actuelle avec une plus grande précision. On applique ce procédé et ce système pour la stérilisation de matériaux d'emballage, de contenants d'emballage et de machines d'emballage ou de remplissage dans l'industrie alimentaire.

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