Concentration detector

G - Physics – 01 – N

Patent

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Details

G01N 15/06 (2006.01) G01N 27/22 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2423376

A transducing device of a concentration detector consists of a non-metallic tube (1), forming a receptacle through which a sample can flow, and two plates in the form of windings of copper foil (2, 3). A de-gausing metallic enclosure (5) surrounds the copper strip windings. To power the transducer, a voltage controller (21) drives an oscillator (22), which triggers a current application circuit (23). The latter has a two connections (24, 25) - pins (1 and 2) - to the respective plates (2, 3). One is at virtual ground potential the other has a steady current applied to it. The voltage between plates is shown in Figure 4. An output (26) - pin (6) - from the current application circuit is connected to a rectifier (27), in turn connected to an analogue to digital converter (28) from which the output can be input to processsing equipment such as a computer.

L'invention concerne un transducteur de détecteur de concentration comprenant un tube non métallique (1) constituant un dispositif par lequel peut circuler un échantillon, et deux plaques en forme d'enroulements de feuilles de cuivre (2, 3). Une enveloppe métallique (5) de démagnétisation entoure les enroulements de ruban de cuivre. Pour alimenter le transducteur, une unité de commande (21) de tension entraîne un oscillateur (22) qui déclenche un circuit (23) d'application de courant. Ce dernier comprend deux connexions (24, 25) - broches 1 et 2 - aux plaques correspondantes (2, 3). L'une a un potentiel à la terre virtuel, l'autre reçoit l'application d'un courant continu. La tension entre les plaques est représentée dans la figure 4. Une sortie (26) - broche (6) - du circuit d'application de courant est connectée à un redresseur (27) à son tour connecté à un convertisseur analogique-numérique (28) à partir duquel la sortie peut être introduite dans un système de traitement, par exemple un ordinateur.

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