An emissivity-corrected method for the accurate radiometric measurement of transient surface temperatures during braking

Haytam Kasem (1) , Jean Thevenet (2) , Xavier Boidin (1) , Monica Siroux (2) , Philippe Dufrenoy (1) , Bernard Desmet (2) , Yannick Desplanques (1)

1 LML - Laboratoire de Mécanique de Lille - FRE 3723
2 LME - Laboratoire de Mécanique et d'Energétique

The main difficulty encountered in brake disc infrared temperature measurements is the lack of knowledge of the disc surface emissivity, which is nonuniform and varies during braking. To provide information on the nonuniformity and variations of emissivity, brake disc surface temperatures were investigated by an original two-colour fibre optic pyrometer and an infrared camera. The first result is the measurements of the accurate surface temperature. Besides, it is shown that the local emissivity varies with friction due to modifications of surface properties. Thermal phenomena observed on the disc track are correlated with temporal changes of normal and tangential frictional forces.

Mots clés: Braking; Radiometric measurements; Two-colour pyrometer; Emissivity variation

Haytam Kasem, Jean Thevenet, Xavier Boidin, Monica Siroux, Philippe Dufrenoy, et al.. An emissivity-corrected method for the accurate radiometric measurement of transient surface temperatures during braking. Tribology International, 2010, 43 (10), pp.1823-1830. ⟨10.1016/j.triboint.2010.01.015⟩. ⟨hal-00512607⟩