Apparatus for capacitive electrical detection

G - Physics – 01 – N

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Details

G01N 27/22 (2006.01) G01F 1/56 (2006.01) G01F 23/26 (2006.01)

Patent

CA 2284645

Apparatus for capacitive electrical detection or measurement relating to a medium, comprising at least one electrode (10) having a given surface extension (10A, 10B) and an oscillator circuit (15) the output frequency of which is a function of the capacitance being associated with the electrode and the dielectric constant of the medium, and is taken as a basis for the detection or measurement. The effective spacing of the electrode (10) from a counter electrode or frome earth is of the same or a substantially higher order of magnitude as seen in relation to the surface extension (10A, 10B) of the electrode (10). A conductor (11) connecting the electrode (10) to the oscillator circuit (15) has a length that is a small fraction as seen in relation to the surface extension (10A, 10B) of the electrode.

Cet appareil de détection ou de mesure électrique capacitive se rapportant à un milieu comprend au moins une électrode (10) présentant une extension de surface donnée (10A, 10B), ainsi qu'un montage oscillateur (15) dont la fréquence de sortie est fonction de la capacitance associée à l'électrode et de la constante diélectrique du milieu, cette fréquence étant prise en tant que base pour la détection ou la mesure. L'espacement efficace entre l'électrode (10) et une contre-électrode ou la terre est le même ou d'un ordre de grandeur sensiblement supérieur par rapport à l'extension de surface (10A, 10B) de l'électrode (10). Un conducteur (11) reliant l'électrode (10) au montage oscillateur (15) présente une longueur représentant une petite fraction par rapport à l'extension de surface (10A, 10B) de l'électrode.

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