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  4. Comparison of Laser Pulse Duration for the Spatially Resolved Measurement of Coating Thickness with Laser-Induced Breakdown Spectroscopy
 
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2019
Journal Article
Title

Comparison of Laser Pulse Duration for the Spatially Resolved Measurement of Coating Thickness with Laser-Induced Breakdown Spectroscopy

Abstract
In this study, a method is presented to measure precisely the thickness of coated components based on laser-induced breakdown spectroscopy (LIBS). The thickness is determined by repetitively ablating the coating with ultrashort laser pulses, monitoring the spectrum of the generated plasma and calculating the coating thickness from the specific plasma signal in comparison to a reference measurement. We compare different pulse durations of the laser (290 fs, 10 ps, 6 ns) to extend the material analysis capabilities of LIBS to a real thickness measurement tool. The method is designed for production processes with known coating materials. Here, we show this for a nickel coating and a tungsten carbide coating on a copper sample with thicknesses from 5-30 µm.
Author(s)
Basler, Carl  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Brandenburg, Albrecht  
Michalik, Katarzyna
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Mory, David
Journal
Sensors. Online journal  
Project(s)
DSA LIPS
Funder
Bundesministerium für Bildung und Forschung BMBF (Deutschland)  
Open Access
Link
Link
DOI
10.3390/s19194133
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • laser-induced breakdown spectroscopy

  • LIBS

  • coating thickness

  • ultrashort laser pulses

  • industrial application

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