| 摘要 |
The invention relates to a method for determining the temperature of an infrared-active gas by means of infrared spectroscopy, the method comprising: radiating infrared light in a spectral range of 700 cm-1 to 5000 cm-1 originating from an infrared light source onto the gas; obtaining a first absorption-related parameter originating from measuring a first infrared absorption band of the gas, wherein the first infrared absorption band is a hot band being caused by thermal population of at least one vibrational mode of the gas; obtaining a second absorption-related parameter originating from measuring a second infrared absorption band of the gas, and calculating a ratio between the first absorption-related parameter and the second absorption- related parameter. The method is characterized in that the ratio is used to determine the temperature of the gas, wherein the ratio has a relative change of at least 0.5 % per Kelvin temperature difference of the gas. |
