Laser pulse transient method for measuring the normal spectral emissivity of samples with arbitrary surface quality |
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Authors: | A Jeromen I Grabec E Govekar |
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Affiliation: | (1) Laboratory of Synergetics, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, P.O. Box 394, 1000 Ljubljana, Slovenia |
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Abstract: | A laser pulse transient method for measuring normal spectral emissivity is described. In this method, a laser pulse (λ=1064 nm) irradiates the top surface of a flat specimen. A two-dimensional temperature response of the bottom surface is measured
with a calibrated thermographic camera. By solving an axisymmetric boundary value heat conduction problem, the normal spectral
emissivity at 1064 nm is determined by using an iterative nonlinear least-squares estimation procedure. The method can be
applied to arbitrary sample surface quality. The method is tested on a nickel specimen and used to determine the normal spectral
emissivity of AISI 304 stainless steel. The expanded combined uncertainty of the method has been estimated to be 18%. |
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Keywords: | PACS" target="_blank">PACS 78 20 Ci 42 62 -b 07 05 Tp |
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