Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1983-12-02
1985-04-23
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
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.
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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.
Kohara Satsuki
Ono Noriaki
Kaplan G. L.
Olympus Optical Co,. Ltd.
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