| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas sensor with improvement in the measurement accuracy realized. <P>SOLUTION: This gas sensor for specifying a concentration of a predetermined gas component in a measurement gas, on the basis of a current flowing in an oxygen ion conductive solid electrolyte by the decomposition of the predetermined gas component, includes an internal space to which the measurement gas is introduced from an external space; a reference gas space to which a reference gas is introduced; a pumping cell provided, capable of pumping out oxygen in the internal space, by applying a predetermined voltage between a first electrode formed on the surface of the internal space and a second electrode formed on a space different from the internal space; and a measuring cell provided, capable of measuring a current flowing between a measuring electrode and a reference electrode, by applying a voltage between the measuring electrode formed on the surface of the internal space and the reference electrode formed to make contact with the reference gas, wherein the first electrode is formed of porous cermet, consisting of a noble metal and an oxygen ion conductive solid electrolyte, and the porosity of the first electrode is greater than or equal to 10% and less than or equal to 50%. <P>COPYRIGHT: (C)2010,JPO&INPIT |
