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

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Kasem Haytam; Thevenet Jean; Boidin Xavier; Siroux Monica; Dufrenoy Philippe; Desmet Bernard; Desplanques Yannick
journal (abréviation) Tribology International (Tribol Int)
volume (numéro) 43 (10)
pages 1823 – 1830
résumé The main difficulty encountered in brake disc infrared temperature measurements is a 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-color fiber 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 surface properties modifications. Thermal phenomena observed on the disc track are correlated with temporal changes of normal and tangential frictional forces.
mots clés Braking; Radiometric measurements; Two-color pyrometer; Emissivity variation
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