Gas sensor with pH-sensitive FET transducer

Details Gas sensor with pH-sensitive FET transducer Gas sensor with pH-sensitive FET transducer

1981-08-17

1983-10-18

Apley, Richard J.

Surgery

Truss

Pad

204406, 357 25, A61B 500

Patent

active

044099800

ABSTRACT:
A gas sensor which includes a reference electrode deposited on the surface of a pH-sensitive transducer having a gate-insulated field-effect transistor (FET) structure and adjacent a gate region of the FET, the transducer and reference electrode being housed in a flexible tube so that the gate region of the FET is located in an opening provided at the front end of or on the side wall of the tube. Lead wires connected to the FET and to the reference electrode extend along the tube. Between the inner wall of the tube and lead-wire FET bonding part is placed electrical insulation resin filling to stop the tube. A hydrophilic polymer layer containing electrolyte is provided which at least extends over both the FET gate region and a part of the reference electrode. A gas permeable membrane is laid over the polymer layer.

REFERENCES:
patent: 3957613 (1976-05-01), Macur
patent: 4218298 (1980-08-01), Shimada et al.

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