Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1989-09-27
1990-10-23
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
29 2542, 733365, H01G 700, H01G 520, G01N 2712
Patent
active
049656988
ABSTRACT:
A capacitance humidity sensor according to the invention has a dielectric film core which is in contact with a pair of polymeric conductive layers bonded to opposite faces of the core. The dielectric core is made of a polymeric material having a dielectric constant which varies substantially linearly with humidity, such as a polyimide or polyparabanic acid. The conductive layers are made of a polymeric material having conductive particles, such as carbon particles, dispersed therein. Such conductive layers provide superior performance and corrosion resistance in comparison to the metal films commonly employed in the prior art.
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Colla Jeannine O.
Thoma Paul E.
Griffin Donald A.
Johnson Service Company
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