Temperature measurement of laser heated metals in highly oxidizing environment using 2D single-band and spectral pyrometry
TypeArticles dans des revues avec comité de lecture
Calibration and validation of two temperature measurement techniques both using optical pyrometry, usable in the framework of the study of the heated metals in highly oxidizing environments and more generally during laser processing of materials in the range of 2000-4000 K have been done. The 2D single-band pyrometry technique using a fast camera provides 2D temperature measurement, whereas spectral pyrometry uses a spectrometer analyzing the spectra emitted by a spot on the observed surface, with uncertainties calculated to be, respectively, within ±3 and 6 of the temperature. Both techniques have been used simultaneously for temperature measurement of laser heated V, Nb, Ta, and W rods under argon and to measure the temperature of steel and iron rods during combustion under oxygen. Results obtained with both techniques are very similar and within the error bars of each other when emissivity remains constant. Moreover, spectral pyrometry has proved to be able to provide correct measurement of temperature, even with unexpected variations of the emissivity during the observed process, and to give a relevant value of this emissivity. A validation of a comsol numerical model of the heating cycle of W, Ta, Nb, V rods has been obtained by comparison with the measurement.
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Mesure de température par pyrométrie 2D à bande spectrale et pyrométrie spectrale de métaux chauffés par laser dans un environnement fortement oxydant MULLER, Maryse; FABBRO, Rémy; EL-RABII, Hazem; HIRANO, Koji (Société Française de Thermique / Congrès Français de Thermique - Thermique en conditions extrêmes, 29 mai - 1er juin 2012, Bordeaux, 2012)La calibration et la validation de deux techniques de mesure de température complémentaires basées toutes les deux sur la pyrométrie optique (pyrométrie 2D monobande et pyrométrie spectrale), utilisables dans le cadre de ...
MULLER, Maryse; EL-RABII, Hazem; FABBRO, Rémy (Taylor & Francis, 2014)The ignition of pure iron, mild steel S355J, and stainless steel 316L has been investigated. The whole ignition and combustion processes have been monitored using a high-speed video camera and adapted pyrometry. Our results ...
MULLER, Maryse; EL-RABII, Hazem; FABBRO, Rémy (Springer, 2015)In this article, we report an investigation of laser-initiated ignition of pure iron rods, using optical pyrometry, video observations, and analysis of metallographic cross section of quenched burning liquid on copper ...
EL-RABII, Hazem; KAZAKOV, Kirill A.; MULLER, Maryse (AIP Publishing, 2017)The effects of oxygen flow speed and pressure on the iron and mild steel combustion are investigated experimentally and theoretically. The studied specimens are vertical cylindrical rods subjected to an axial oxygen flow ...
Experimental determination of temperature threshold for melt surface deformation during laser interaction on iron at atmospheric pressure HIRANO, Koji; FABBRO, Rémy; MULLER, Maryse (IOP, 2011)Recoil pressure is the principal driving force of molten metal in laser processing in the intensity range of 10^-1 ~ 10^2 MW/cm2. It is thus essential to estimate the recoil pressure in order to describe physical processes ...