title: High Resolution Temperature Measurement of Liquid Stainless Steel Using Hyperspectral Imaging.
abstract: A contactless temperature measurement system is presented based on a hyperspectral line camera that captures the spectra in the visible and near infrared (VNIR) region of a large set of closely spaced points. The measured spectra are used in a nonlinear least squares optimization routine to calculate a one-dimensional temperature profile with high spatial resolution. Measurements of a liquid melt pool of AISI 316L stainless steel show that the system is able to determine the absolute temperatures with an accuracy of 10%. The measurements are made with a spatial resolution of 12 µm/pixel, justifying its use in applications where high temperature measurements with high spatial detail are desired, such as in the laser material processing and additive manufacturing fields.
authors.affiliation: Vrije Universiteit Brussel, Department of Mechanical Engineering, Pleinlaan 2, B-1050 Brussels, Belgium. wim.devesse@vub.ac.be.
authors.forename: Wim
authors.initials: W
authors.lastname: Devesse
authors.affiliation: Vrije Universiteit Brussel, Department of Mechanical Engineering, Pleinlaan 2, B-1050 Brussels, Belgium. dieter.de.baere@vub.ac.be.
authors.forename: Dieter
authors.initials: D
authors.lastname: De Baere
authors.affiliation: Vrije Universiteit Brussel, Department of Mechanical Engineering, Pleinlaan 2, B-1050 Brussels, Belgium. patrick.guillaume@vub.ac.be.
authors.forename: Patrick
authors.initials: P
authors.lastname: Guillaume
keywords: hyperspectral imaging; laser material processing; temperature measurement