On the possibility of laser pulse characterization based on displacements and temperatures at the back surface of the target body

Karol Pietrak , Piotr Łapka , Małgorzata Kujawińska

Abstract

Identification of parameters of laser beams is important in all applications of lasers. In this paper, results of numerical verification are presented for identification of parameters of pulsed, high-power laser beam based on displacement fields of the target body. It is considered how laser power as well as spatial and temporal characteristics of the beam may be recovered based on measurements of thermally-caused deformation of thin aluminum plate. Mechanical displacement of the plate surface was calculated using Finite Element Method (FEM), for selected time instants, based on solutions of the unsteady thermal problem obtained with Finite Volume Method (FVM). Sensitivity of measured displacements to changes of recovered laser pulse parameters is discussed. Preliminary results of parameter estimation based solely on measurements of the Z-component of displacement field were compared with results of estimations based on measurements of temperatures. The comparison was made for inverse problems solved using Levenberg-Marquardt method applying synthetic measurement data instead of physical one. It was found that solutions of the inverse problem based on temperatures are better than those based on mechanical analysis.
Author Karol Pietrak (FPAE / IHE)
Karol Pietrak,,
- The Institute of Heat Engineering
, Piotr Łapka (FPAE / IHE)
Piotr Łapka,,
- The Institute of Heat Engineering
, Małgorzata Kujawińska (FM / IMPh)
Małgorzata Kujawińska,,
- The Institute of Micromechanics and Photonics
Pages0200931-0200936
Book COMPUTATIONAL TECHNOLOGIES IN ENGINEERING (TKI’2018): Proceedings of the 15th Conference on Computational Technologies in Engineering, AIP Conference Proceedings, vol. 2078, 2019, AIP Publishing, ISBN 978-0-7354-1806-6
DOIDOI:10.1063/1.5092096
URL https://aip.scitation.org/doi/10.1063/1.5092096
Languageen angielski
File
1.5092096.pdf 874.85 KB
Score (nominal)15
ScoreMinisterial score = 15.0, 08-04-2019, BookChapterSeriesAndMatConf
Ministerial score (2013-2016) = 15.0, 08-04-2019, BookChapterSeriesAndMatConf
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