| 摘要 |
PROBLEM TO BE SOLVED: To enable the highly accurate measurement of a predetermined gas component by resisting the effects of electrical noise, etc. SOLUTION: By passing current through an ion conductor to conduct oxygen ions via a current supplying circuit 14, a gas sensor controls the concentration of oxygen and/or measures NOx. With current outputted from the current supplying circuit 14 as a pulse shape (current signal) Sif with a constant peak value, the gas sensor is provided with a rectangular wave generating circuit 76 for controlling the frequency of the current signal Sif on the basis of an electromotive force V2 which occurs in the ion conductor. |
