Planar capacitive transducer

Details Planar capacitive transducer Planar capacitive transducer

2005-01-11

2005-01-11

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S658000, C073S335040

Reexamination Certificate

active

06842018

ABSTRACT:
A transducer comprising at least one planar capacitor with a thin coverlayer of material selected to maximize electric field coupling between cooperating capacitor electrodes within a region external to a principal surface of the coverlayer. Preferred coverlayer materials have low values of moisture absorption, surface free energy, permittivity, dielectric dissipation, and electrical conductance. According to one embodiment of the invention, a driven shield further enhances electric field coupling over and in a region external to the principal surface. The transducer also can promote a physical change in specific adsorbates and materials and simultaneously detect and measure an effect of the induced change. Applications for the transducer of the invention include the measurement of the moisture content of grain and bulk stored commodities, humidity, a dew point temperature, the onset of condensation and rates of adsorption and desorption.

REFERENCES:
patent: 4891574 (1990-01-01), Nagaya et al.
patent: 4968946 (1990-11-01), Maier
patent: 5045828 (1991-09-01), Kulwicki et al.
patent: 5208544 (1993-05-01), McBrearty et al.
patent: 5767687 (1998-06-01), Geist
patent: 6126312 (2000-10-01), Sakai et al.
patent: 6700394 (2004-03-01), Greer

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