High Resolution Temperature Measurement of Liquid Stainless Steel Using Hyperspectral Imaging
Wim Devesse *, Dieter De Baere and Patrick Guillaume Vrije Universiteit Brussel, Department of Mechanical Engineering, Pleinlaan 2, B-1050 Brussels, Belgium; dieter.de.baere@vub.ac.be (D.D.B.); patrick.guillaume@vub.ac.be (P.G.) * Correspondence: wim.devesse@vub.ac.be; Tel.: +32-2629-2807 Academic Editor: Vittorio M. N. Passaro
Received: 17 October 2016; Accepted: 29 December 2016; Published: 5 January 2017
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.
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