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High Resolution Temperature Measurement of Liquid Stainless Steel Using Hyperspectral Imaging


Technology that can be utilized with additive manufacturing in mind. The 13 page PDF - High Resolution Temperature Measurement of Liquid Stainless Steel Using Hyperspectral Imaging - Published: 5 January 2017

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;
[e-mail] (D.D.B.); [e-mail] (P.G.)
* Correspondence: [e-mail]; Tel.: [phone]
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.