Capacitance humidity sensor

Details Capacitance humidity sensor Capacitance humidity sensor

1992-02-05

1993-01-05

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

29 2542, 733356, H01G 520, H01G 700, G01W 100

Patent

active

051776626

ABSTRACT:
A capacitance humidity sensor according to the invention has a film core which is in contact with a pair of polymeric conductive layers bonded to opposite faces of the core. The 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, at least a portion of which includes sulfur atoms in the backbone chain and having conductive particles, such as carbon particles, dispersed therein. Such conductive layers provide superior performance and corrosion resistance in comparison to the metal films employed in the prior art and in comparison to cellulosic polymers containing conductive particles.

REFERENCES:
patent: 3458845 (1969-07-01), Thoma
patent: 3582728 (1971-06-01), Thoma
patent: 3697450 (1972-10-01), Takenaka
patent: 3802268 (1974-04-01), Thoma
patent: 4564882 (1986-01-01), Baxter et al.
patent: 4965698 (1990-10-01), Thoma et al.
patent: 5050434 (1991-09-01), Demisch
patent: 5069069 (1991-12-01), Miyagishi et al.
IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. CHMT-2, No. 2, Sep. 1979, pp. 321-323

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