Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1990-07-18
1991-12-24
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
29 2542, 733665, H01G 700, G01N 2712
Patent
active
050758160
ABSTRACT:
The invention concerns a capacitive humidity sensor (6) capable of being connected to a measurement device of dielectric factor and a method for producing the sensor. The sensor comprises a dielectric layer (3), whose dielectric factor changes according to the moisture content absorbed in the layer, and at least two galvanically isolated conductive layers (2,1) enclosing the dielectric layer (3), where one of the conductive layers (2) of the capacitor construction is provided with a random pattern of clefts (7), which allow an immediate communication of ambient air with the dielectric layer (3). According to the invention, the dielectric layer (3) has a solid structure without cracks corresponding to the clefts (7) of the conductive layer (2). The construction according to the invention offers a reduction of the capillary effect and associated hysteresis up to a complete elimination of the effect in some embodiments of the invention.
REFERENCES:
patent: 3614561 (1971-10-01), Behn et al.
patent: 4164868 (1979-08-01), Suntola
patent: 4305112 (1981-12-01), Heywang et al.
patent: 4761710 (1988-08-01), Chen
Griffin Donald A.
Vaisala Oy
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