Patent ID: 6093294
Filing Date: 2000-07-25
Classification: G01N

Abstract:
A gas sensor comprising:a first space surrounded by first, second and third substrates composed of solid electrolytes, for introducing a measurement gas thereinto;a gas-pumping means including inner and outer electrodes formed inside and outside said first space surrounded by said substrates respectively, said third substrate interposed by said both electrodes, and a pumping power source for applying, between said both electrodes, a control voltage for pumping out a predetermined gas component;a second space surrounded by substrates composed of solid electrolytes, for introducing a reference gas thereinto;a measuring means for measuring a terminal voltage between a reference electrode formed on said first substrate and disposed on a side of said second space and said inner electrode of said gas-pumping means;a first control voltage-adjusting means for adjusting a level of said control voltage on the basis of said terminal voltage;a second control voltage-adjusting means for detecting a current flowing through said gas-pumping means when said gas component is pumped out by said gas-pumping means, and reflecting an obtained value of said current in said adjustment for said level of said control voltage performed by said first control voltage-adjusting means; anda spike-suppressing means for suppressing a spike signal generated in said second control voltage-adjusting means.