The infrared measurement of form deviations of machine parts in motion

The thermovision method was applied to assess the type and quality of friction between the mating surfaces of an automotive drum brake. The thermal field on the outer surface of a drum was analysed to determine roundness and waviness profiles of the elements in motion. In the experiment, the distribution of temperature was measured along the outer circumference of the drum employing the infrared technique. The results were compared with those obtained for the inner surface of the drum measured with a Taylor–Hobson Talyrond 73 precise measurement device. The analysis shows that a temperature signal can be used to assess the geometrical structure of machine parts in motion.