The problem of the accuracy of temperature measuring by means of a thermographic camera

Abstract
Theoretical and technical background of thermal imaging technology is discussed. Operational principles of a modern thermal camera and infrared thermometer are briefly reviewed. The importance of taking into account the integral emissivity coefficient in temperature measurements is demonstrated on the basis of the analysed regularities of heat radiation. The factors affecting the accuracy of temperature field measurements with the help of thermal imaging technology are speculated upon in detail. Such factors are surface structure, presence of coating on the surface, angle of observation, and shape of the surface. Special attention is given to environmental factors that need to be considered, such as, for example, reflected temperature and convective air flow. The content of the article is illustrated by specific examples of applying thermal imaging in practical measurements.