Ion-controlled diode

Details Ion-controlled diode Ion-controlled diode

1977-03-25

1978-07-25

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

23254E, 73 23, 324 71R, 324 71SN, 340627, G01R 2702

Patent

active

041032276

ABSTRACT:
Disclosed is an ion-controlled device for providing an electrical indication of a specific ion concentration in a fluid. An ion-sensitive membrane is placed over the junction of a gate controlled diode whose impedance is being measured. An external reference electrode is biased such that an inversion layer forms in the semiconductor material near the ion-sensitive membrane. Changes in the concentration of the unknown ion in fluid passing over the ion-sensitive membrane will affect the inversion layer in the gate controlled diode. The change in inversion layer will result in measurable changes in the diodes impedance.

REFERENCES:
patent: 2711511 (1955-06-01), Pietenpol
patent: 3295022 (1966-12-01), Schelisch
patent: 3428892 (1969-02-01), Meinhard
patent: 3831432 (1974-08-01), Cox

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