Gas sensor including sensing section for sensing predetermined physical quantity and voltage switching section for switching between voltages for heating gas sensitive film

摘要

According to one embodiment, a gas sensor includes a film structure including a gas sensitive film and a heater film heating the gas sensitive film, a physical quantity sensing section sensing a predetermined physical quantity which varies based on storage of a gas to be carried out by the gas sensitive film, a voltage generation section generating a first voltage for heating the gas sensitive film at a first temperature and a second voltage for heating the gas sensitive film at a second temperature higher than the first temperature, and a voltage switching section switching between the first voltage and the second voltage to be supplied to the heater film.