Chemically sensitive element

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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204418, 204419, 357 25, G01N 2730

Patent

active

045128707

ABSTRACT:
A chemical sensing element suitable for measurement of the activity or the concentration of a specific ion contained in an electrolyte is provided with an optically opaque membrane between a gate insulating membrane and an ion sensing membrane of a field-effect type transistor. Since the opaque membrane is provided, extraneous light impinging on a gate is blocked by the opaque membrane, whereby an erroneous potential due to extraneous light is prevented. Accordingly, the accurate measurement of the activity or the concentration of a specific ion contained in an electrolyte may be achieved even in intense ambient light.

REFERENCES:
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patent: 4020830 (1977-05-01), Johnson
patent: 4273636 (1981-06-01), Shimada et al.
patent: 4411741 (1983-10-01), Janata
12th Conference of the Medical Engineering Society of Japan, Copendium of Scheduled Addresses, May 1973.
Documentary Materials for Research Meeting on Electrical Measurement--Documents No. EM-74-22 through 31, "New Fields of Instrumentation v. Bio-Electrical Instrumentation, Jan. 28, 29, 1974, Japan.
Moody et al, "Selective Ion Sensitive Electrodes", Merrow Technical Library, 1971.
Fiedler et al, "Selectrode--The Universal Ion-Selective Electrode", Part VII. A Valinomycin-Based Potassium Electrode with Nonporous Polymer Membrane and Solid-State Inner Reference System, Analytica Chimica Acta. 67, (1973), 179-193.
Gough et al, "Enzyme Electrodes", Science, vol. 180, pp. 380-384.
Bergveld, "Development, Operation and Application of the Ion-Sensitive Field-Effect Transistor as a Tool for Electrophysiology", IEEE Transactions on Biomedical Engineering, vol. BME-19, No. 5, Sep. 1972.

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