The methods of measuring temperature distribution and their application in different fields are analyzed. Classification of methods is given and a comparative description of advantages and disadvantages is given.
The effect of impact factors on the output signal of the radiation receiver is analyzed. Necessity to do additional in-situ calibration of thermal imager by using the standard extended area grey emitter is justified. In-situ calibration method's algorithm for thermal imager is developed. It helps to eliminate the effect of impact factors on the measurement results of temperature gradient. The requirements to the standard extended area emitter are formulated