Gas Measurement Device

A gas measurement device that measures a sample gas including a plurality of gas components, absorption wavelength ranges of the plurality of gas components at least partially overlapping with each other, the gas measurement device comprising:

• a first detection unit that detects a first component in the sample gas;
• a second detection unit that detects a second component and a third component in the sample gas, each of the second and third components having an absorption wavelength range at least partially overlapping with an absorption wavelength range of the first component;
• and
• an arithmetic unit that determines a concentration of the first component by correcting a detection value of the first component detected by the first detection unit using a plurality of detection values detected by the second detection unit,
• the first detection unit including:
• a first light source;
• a first sample cell filled with the sample gas;
• and
• a first detector that detects light passing through the first sample cell to detect a light intensity thereof in the absorption wavelength range of the first component,
• the first sample cell and the first detector being disposed in series on a first optical path of light emitted from the first light source,
• the second detection unit including:
• a second light source;
• a second sample cell filled with the sample gas;
• a second detector that detects light passing through the second sample cell to detect a light intensity thereof in the absorption wavelength range of the second component;
• and
• a third detector that detects light passing through the second sample cell to detect a light intensity thereof in the absorption wavelength range of the third component,
• the second sample cell, the second detector and the third detector being disposed in series on a second optical path of light emitted from the second light source.