Gas sensor device, gas measurement method, and gas measurement device

A gas measurement method comprising:

• measuring, with use of a gas sensor device including a sensor film of which resistance increases with an increase in an amount of gas adsorbed on a sensor surface, a first electrode, a second electrode, and a third electrode that are electrically coupled to the sensor film, and a protective film that covers the sensor surface in a region between the first electrode and the second electrode, the sensor surface being exposed in a region near the third electrode, a resistance RA between the first electrode and the second electrode;
• measuring, with use of the gas sensor device, a resistance RB between the first electrode or the second electrode and the third electrode;
• sensing absence of the gas in case of RA≈RB;
• and
• sensing presence of the gas in case of RA<RB.

A gas measurement device comprising:

• a memory that stores a gas measurement program;
• and
• a processor that performs, based on the gas measurement program, operations of:
• measuring, with use of a gas sensor device including a sensor film of which resistance increases with an increase in an amount of gas adsorbed on a sensor surface, a first electrode, a second electrode, and a third electrode that are electrically coupled to the sensor film, and a protective film that covers the sensor surface in a region between the first electrode and the second electrode, the sensor surface being exposed in a region near the third electrode, a resistance RA between the first electrode and the second electrode;
• measuring, with use of the gas sensor device, a resistance RB between the first electrode or the second electrode and the third electrode;
• sensing absence of the gas in case of RA≈RB;
• and
• sensing presence of the gas in case of RA<RB.