| 摘要 |
A gas sensor is capable of detecting a concentration of PM contained in an exhaust gas emitted from a diesel engine. The gas sensor is comprised of a ceramic substrate and detection parts which are formed on the ceramic substrate with resistance parts. A resistance value of each of the resistance parts is changed on the basis of the quantity of conductive particulate matter captured by and accumulated on the detection parts. The detection parts have a different detection range. A part of the detection range of each of the detection parts is overlapped together. The concentration of PM contained in the target detection gas is detected on the basis of the change of the resistance value of the resistance parts.
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