Charged non-conductive polar gas sensing element and detection s

Details Charged non-conductive polar gas sensing element and detection s Charged non-conductive polar gas sensing element and detection s

1978-10-11

1981-04-28

Marcus, Michael S.

Chemistry: physical processes

Physical processes

Crystallization

307400, 324 61R, 338 34, 340628, 340632, 361313, 422 98, G01N 2762, G11C 1302

Patent

active

042643317

ABSTRACT:
An air pollutant and/or fire combustion sensing apparatus includes a charged insulating sensing electrode layer establishing an electric field as the result of electric dipoles and/or electric monopoles in or on the sensing layer. The layer has a high surface and bulk resistivity. The layer has a minimal water absorption at environmental humidities. The electric field of the sensing layer creates electrostatic sensing reactions with the gaseous products of combustion and environmental pollution and produces an amplification of the charge detection characteristic to alter the charge of the electrode. In a capacitive sensor, the sensing layer is mounted within and in spaced relation to a ground shield member. The sensing layer is thereby exposed and produces a sensitive capacitive detector for sensing of a wide spectrum of combustion products and the like. Optimum results are obtained by the charging of dielectric materials such as polytetrafluoroethylene (Teflon TFE), perfluoroalkoxy (Teflon PFA), fluorinated ethylene-propylene (Teflon FEP), polystyrene or polyethylene, which also provide detection as the result of their gaseous adsorption characteristics. A high input impedance detecting circuit with good electrometer characteristics responds to the change in the charge, particularly on the surface.

REFERENCES:
patent: 3189802 (1965-06-01), Zisman
patent: 3612778 (1971-10-01), Murphy
patent: 3754219 (1973-08-01), Klein
patent: 3875433 (1975-04-01), Uchikawa
patent: 3989463 (1975-08-01), Klein et al.
patent: 4037310 (1977-07-01), Van Turnhout

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