Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-07-01
1993-10-05
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204419, 204422, 204435, 204415, G01N 2726
Patent
active
052501680
ABSTRACT:
Disclosed is an integrated ion sensor, which comprises at least one ion selective membrane sensitive to ions contained in a solution to be measured for detecting the concentration of the ions, a signal processing circuit for inputting a detected signal obtained by the ion selective membrane through a conductive member and fetching the detected signal through MOSFETs or the like included in an input stage to process the same, a reference electrode disposed in the measuring environment made by the solution to be measured and to be set to a predetermined voltage relationship between the reference electrode and the ion selective membrane, and a power supply having negative and positive terminals for supplying a driving power to the signal processing circuit through the terminals, one of the terminals being connected to the reference electrode, wherein the signal processing circuit is set to an active state at a voltage set to the reference electrode by controlling the threshold value of at least one of the MOSFETs of the signal processing circuit.
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patent: 4020830 (1977-05-01), Johnson et al.
patent: 4691167 (1987-09-01), Vlekkert et al.
patent: 4909921 (1990-03-01), Ito
"ISFET's Using Inorganic Gate Thin Films", IEEE Transactions on Electron Devices, vol. ED-26 No. 12, 1979, pp. 1939-1944.
"The Extended Gate Chemically Sensitive Field Effect Transistor as Multi-Species Microprobe", Sensors & Actuators, 4, 1983, pp. 291-298.
Miyahara Yuji
Shibata Yasuhisa
Tsukada Keiji
Watanabe Yoshio
Bell Bruce F.
Hitachi , Ltd.
Niebling John
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