| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas sensor which is improved in measurement accuracy. <P>SOLUTION: A gas sensor for specifying a gas concentration based on a current flowing in a solid electrolyte by decomposition includes a gas introduction port, a first diffusion control part, a buffer space, a second diffusion control part, and an internal empty space which are sequentially communicated, a reference gas space for introducing reference gas, a pumping cell capable of pumping out oxygen in the internal empty space by applying a predetermined voltage between a first electrode formed on the surface of the internal empty space and a second electrode formed in a space different from the internal empty space, and a measuring cell 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 empty space and the reference electrode formed to contact the reference gas. The first electrode is formed of porous cermet made of a noble metal and an oxygen ion conductive solid electrolyte, and a porosity of the first electrode is 10% or more and 50% or less. <P>COPYRIGHT: (C)2013,JPO&INPIT |
