Tank-contents level measuring assembly

G - Physics – 01 – F

Patent

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Details

G01F 23/284 (2006.01) G01F 23/28 (2006.01)

Patent

CA 2152165

To measure the level of contents in metallic tanks by means of short electromagnetic waves, it is proposed to mount the complete level measuring assembly, including the horn antenna, outside the tank. The transmitted waves are projected through an opening in the tank wall toward the surface of the medium whose level is to be measured. The opening is closed with a glass or ceramic plate. To distinguish the useful signal within the unwanted echos caused by multiple reflections of the electromagnetic waves at the glass or ceramic plate, a damping layer of a conventional damping material is interposed between the microwave coupling element and the surface of the glass or ceramic plate. To achieve an optimum signal-to-noise ratio, the damping coefficient is fixable and the distance between the level measuring assembly and the surface of the glass or ceramic plate is adjustable in the axial direction of the opening.

Afin de mesurer le niveau de remplissage de contenants métalliques à l'aide d'ondes électromagnétiques courtes, il est prévu de monter l'appareil complet de mesure de niveau, y compris l'antenne à cornet, en dehors du contenant concerné. Les ondes émises sont dirigées sur la substance à mesurer, à travers une ouverture pratiquée dans la paroi du contenant. Cette ouverture est fermée par une plaque de verre ou de céramique. Afin de pouvoir identifier le signal utile à l'intérieur des échos parasites provenant des réflexions multiples, il est prévu d'insérer une couche amortisseuse réalisée dans un matériau approprié traditionnel, entre l'élément de couplage des micro-ondes et la surface de la plaque de verre ou de céramique. Afin d'obtenir un rapport signal/bruit optimal, il est possible de définir le coefficient d'amortissement et la distance séparant l'appareil de mesure de niveau, dans le sens axial de l'ouverture du contenant, de la plaque de verre ou de céramique.

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