Electrochemical sensing circuit having high dynamic range

G - Physics – 01 – N

Patent

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G01N 27/416 (2006.01)

Patent

CA 2583455

An electronic sensing circuit for an electrochemical gas sensor cell providing high dynamic range is described. The electronic circuit utilizes an amplifier with a resistive feedback element to provide high sensibility linear sensing of low detected gas concentrations. The electronic circuit also provides the ability to source sufficient current to prevent the electrochemical gas sensor cell from becoming biased under very high gas concentration conditions. This operation is enabled by adding a non-linear element in the feedback path of the amplifier, which non-linear element begins to conduct during the high gas concentration conditions.

L'invention concerne un circuit de détection électronique pour cellule électrochimique de détection de gaz à grande plage dynamique. Le circuit électronique utilise un amplificateur comportant un élément de rétroaction résistif qui détecte de façon linéaire avec une grande sensibilité de faibles concentrations du gaz détecté. Le circuit électronique permet aussi de fournir un courant suffisant pour prévenir une polarisation de la cellule de détection de gaz électrochimique en cas de concentration très élevée de gaz. Pour ce faire, on ajoute un élément non linéaire dans le chemin de rétroaction de l'amplificateur, ledit élément devenant conducteur dans des conditions de concentration très élevée de gaz.

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