Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1988-12-28
1989-10-31
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
G01N 2758
Patent
active
048775118
ABSTRACT:
An oxygen concentration-sensing device includes an oxygen concentration-sensing element formed by an oxygen-pumping element and a cell element, each composed of an oxygen ion-conductive electrolytic member and a pair of electrodes having the member interposed therebetween. The two elements define a gas diffusion-limiting zone therebetween. A current-to-voltage converter circuit has an input terminal connected to the junction between mutually connected ones of the electrodes. A first amplifier generates an output having a level variable in response to the difference between a potential at a conversion output terminal of the current-to-voltage converter circuit and a potential at the other electrode of the cell element, and applies the output to the other electrode of the oxygen-pumping element. A second amplifier has an input thereof connected to the above junction and generates an output proportional to current flowing in the oxygen-pumping element. The current-to-voltage converter circuit imparts a higher gain to the first amplifier when pumping current flowing in the oxygen-pumping element is in a high frequency range.
REFERENCES:
patent: 4615787 (1986-10-01), Yamada et al.
patent: 4777922 (1988-10-01), Mieno et al.
patent: 4787966 (1988-11-01), Nakajima et al.
Mieno Toshiyuki
Nakajima Toyohei
Honda Giken Kogyo Kabushiki Kaisha
Kaplan G. L.
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