Gas sensor

Details Gas sensor Gas sensor

1997-12-05

2000-07-04

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204427, 205781, 205784, 2057865, 205788, G01N 27407

Patent

active

06083370&

ABSTRACT:
Disclosed is a gas sensor comprising a main pumping cell for pumping-processing oxygen contained in a measurement gas introduced into a first chamber, an auxiliary pumping cell for pumping-processing oxygen contained in the measurement gas introduced into a second chamber, a measuring pumping cell for pumping-processing oxygen in the measurement gas introduced via a third diffusion rate-determining section, an ammeter for detecting a pumping current generated depending on an amount of oxygen pumping-processed by the measuring pumping cell, a heater for heating at least the main pumping cell, the auxiliary pumping cell, and the measuring pumping cell to a predetermined temperature, an impedance-detecting circuit for detecting an impedance between an inner pumping electrode and an auxiliary pumping electrode, and a heater control circuit for controlling electric power application to the heater on the basis of a value of the impedance detected by the impedance-detecting circuit. Accordingly, it is possible to realize suppression of variation in detection output which would be otherwise caused depending on the measurement gas temperature and a high S/N ratio of detection output.

REFERENCES:
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patent: 4543176 (1985-09-01), Harada et al.
patent: 4609453 (1986-09-01), Shimomura
patent: 5547552 (1996-08-01), Hasegawa et al.
patent: 5672811 (1997-09-01), Kato et al.
patent: 5709198 (1998-01-01), Sagisaka et al.
patent: 5763763 (1998-06-01), Kato et al.
Patent Abstracts of Japan, vol. 10, No. 324 (P-512), Nov. 5, 1986 & JP 61 132851 A (Nippon Denso Co) *abstract*.
Patent Abstracts of Japan, vol. 8, No. 18 (P-250), Jan. 16, 1984 & JP 58 178248 A (Toyota), Oct. 19, 1983, *abstract*.

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