Capacitance humidity sensor

G - Physics – 01 – N

Patent

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Details

G01N 27/22 (2006.01) G01M 3/16 (2006.01) H01G 4/18 (2006.01) H01G 7/00 (2006.01)

Patent

CA 2066762

A capacitance humidity sensor according to the invention has a dielectric film core (11) which is in contact with a pair of polymeric conductive layers (12. 13) bonded to opposite faces to the core (11). The dielectric core (11) is made of a polymeric material having a dielectric constant which varies substantially linearly with humidity, such as polyimide or polyparabanic acid. The conductive layers (12, 13) are made of a polymeric material having conductive particles, such as carbon particles, dispersed therein. Such conductive layers (12, 13) provide superior performance and corrosion resistance in comparison to the metal films commonly employed in the prior art.

Le détecteur d'humidité de capacitance de l'invention possède un noyau à film diélectrique (11) qui est en contact avec une paire de couches conductrices polymères (12, 13) qui adhèrent aux faces opposées du noyau (11). Le noyau diélectrique (11) est constitué d'un matériau polymère ayant une constante diélectrique qui varie sensiblement linéairement avec l'humidité, tel que le polyimide ou l'acide polyparabanique. Les couches conductrices (12, 13) sont constituées d'un matériau polymère ayant des particules conductrices, telles que des particules de carbone, dispersées à l'intérieur du matériau polymère. De telles couches conductrices (12, 13) confèrent une efficacité et une résistance à la corrosion supérieures par rapport au film métallique couramment utilisé dans l'art antérieur.

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