Gas concentration detection device

A gas concentration detection device comprising:

• a first element part, a first detection part, a second element part, a second detection part and a sensitivity correction part, wherein
• the first element part comprises a first solid electrolyte body having ionic conductivity, a pair of first electrodes arranged on the first solid electrolyte body, and, a diffusion resistance part and a gas chamber, the gas chamber accommodates one of the pair of first electrodes, the gas chamber being configurated to receive, via the diffusion resistance part, a target gas to be detected,
• the first detection part is configured to detect a first gas concentration contained in the target gas on the basis of a direct current flowing between the pair of first electrodes when a flow amount of the target gas into the gas chamber is adjusted by the diffusion resistance part and a direct current voltage is applied to the pair of first electrodes,
• the second element part comprises a second solid electrolyte body having ionic conductivity and a pair of second electrodes, the second solid electrolyte body is laminated on the first electrolyte body through an insulator, and the pair of second electrodes are arranged on the second solid electrolyte body,
• the second detection part is configured to detect a second gas component concentration contained in the target gas on the basis of a potential difference generated between the pair of second electrodes, when at least one of the pair of second electrodes being arranged on an outer surface of the second electrolyte body and exposed to the target gas, in response to the first detection part and the second detection part detecting a variation in concentration of a common gas component, contained in the target gas, of more than a reference variation amount, contained in the target gas,
• the sensitivity correction part is configured to correct the second gas component concentration detected by the second detection part on the basis of an output variation time difference and either of a response time difference or a response speed difference, the output variation time difference indicates a difference between a first output variation time detected by the first detection part and a second output variation time detected by the second detection part, the response time difference indicates a difference between a first response time of the first detection part and a second response time of the second detection part, and the response speed difference indicates a difference between a first response speed of the first detection part and a second response speed of the second detection part.