Diffusion-type ndir gas analyzer with convection flow

G - Physics – 01 – N

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G01N 21/61 (2006.01) G01N 21/35 (2006.01)

Patent

CA 2307782

A diffusion-type NDIR gas analyzer (100) with an improved response time due to convection flow created by a temperature gradient between gas located within a waveguide (2) and gas located within a diffusion pocket of space (8) created between the waveguide and a semi-permeable membrane (7) which surrounds the waveguide. The temperature gradient may be created by a thermally resistive radiation source (1) that is not thermally isolated from the waveguide. The semi- permeable membrane is made of a hydrophobic material and has a thickness sufficient to provide its own structural integrity. The semi- permeable membrane can have a pore size less than approximately 50 micrometers and be comprised of ultrahigh molecular weight polyethylene or other suitable materials.

Divulgation d'un analyseur de gaz (100) par spectrométrie d'absorption non dispersive dans l'infrarouge de type à diffusion avec temps de réponse amélioré grâce à un écoulement par convection obtenu grâce à un gradient de température entre le gaz se trouvant dans un guide d'onde (2) et le gaz se trouvant dans une poche de diffusion de l'espace (8) créée entre le guide d'onde et une membrane semi-perméable (7) qui entoure le guide d'onde. Le gradient de température peut être obtenu au moyen d'une source de rayonnement à résistance thermique (1) qui n'est pas thermiquement isolée du guide d'onde. La membrane semi-perméable est en une matière hydrophobe et a une épaisseur suffisante pour assurer sa propre intégrité structurelle. La membrane semi-perméable peut avoir des pores d'une taille inférieure à environ 50 micromètres et être en polyéthylène de très haut poids moléculaire ou en une autre matière adéquate.

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