Influence of Atmospheric Transmittance on Infrared Temperature Measurement Accuracy

Infrared temperature measurement has a wide range and more applications, due to infrared temperature measurement does not need to contact with the object under test. However, the accuracy of infrared temperature measurement is difficult to reach a satisfactory degree, which limits the development and application of infrared temperature measurement method. This study explores how the atmospheric transmittance affects the temperature measurement accuracy of infrared thermal imager. Based on the composition of atmosphere, the major reason affecting atmospheric transmittance have been found. Meanwhile, according to the influence of water vapor and carbon dioxide absorption, aerosol, atmospheric molecule and other suspended particles, attenuation of atmospheric transmittance caused by complex weather conditions, such as rain and snow. Atmospheric transmission model is proposed, and the theoretical formula for calculating atmospheric transmittance is obtained.