Ion-controlled diode

Details Ion-controlled diode Ion-controlled diode

G - Physics

01

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356/117, 324/23

G01R 27/02 (2006.01) G01N 27/30 (2006.01) G01N 27/414 (2006.01) G01R 19/08 (2006.01) G01R 27/22 (2006.01) G01R 31/26 (2006.01)

Patent

CA 1088216

ION-CONTROLLED DIODE Abstract of the Disclosure Disclosed is an ion-controlled diode 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 impedence. - 1 -

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