Analysis device and analysis method

An analysis device configured to measure a concentration of a measurement target component that is at least one of nitric oxide, nitrogen dioxide, nitrous oxide, ammonia, ethane, formaldehyde, acetaldehyde, sulfur dioxide, methane, methanol, or ethanol contained in a combustion gas, the analysis device comprising:

• a laser light source configured to irradiate the combustion gas with reference light;
• a light detector configured to detect intensity of sample light obtained when the reference light is transmitted through the combustion gas;
• and
• a concentration calculation unit configured to calculate the concentration of the measurement target component (i) based on an output signal from the light detector and (ii) using a selected absorption wavelength range of the measurement target component such that absorption by an interference component contained in the combustion gas is smaller than absorption by the interference component at other wavelengths within a predetermined wavelength region in which the measurement target component exhibits absorption,
• wherein the concentration calculation unit is configured to:
• when a concentration of the nitric oxide is measured, calculate the concentration of the nitric oxide based on absorption between 5.24 and 5.26 μm by the nitric oxide;
• when a concentration of the nitrogen dioxide is measured, calculate the concentration of the nitrogen dioxide based on absorption between 6.14 and 6.26 μm by the nitrogen dioxide;
• when a concentration of the nitrous oxide is measured, calculate the concentration of the nitrous oxide based on absorption between 7.84 and 7.91 μm by the nitrous oxide;
• when a concentration of the ammonia is measured, calculate the concentration of the ammonia based on absorption between 9.38 and 9.56 μm by the ammonia;
• when a concentration of the ethane is measured, calculate the concentration of the ethane based on absorption between 3.33 and 3.36 μm by the ethane;
• when a concentration of the formaldehyde or the acetaldehyde is measured, calculate the concentration of the formaldehyde or the acetaldehyde based on absorption between 5.65 and 5.67 μm by the formaldehyde or the acetaldehyde;
• when a concentration of the sulfur dioxide is measured, calculate the concentration of the sulfur dioxide based on absorption between 7.38 and 7.42 μm by the sulfur dioxide;
• when a concentration of the methane is measured, calculate the concentration of the methane based on absorption between 7.50 and 7.54 μm by the methane;
• and
• when a concentration of the methanol or the ethanol is measured, calculate the concentration of the methanol or the ethanol based on absorption between 9.45 and 9.47 μm by the methanol or the ethanol.