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

Sensors

卷:19

Albrecht Brandenburg¹  Carl Basler¹  David Mory²  Katarzyna Michalik² 

[1] Fraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, Germany;

[2] LTB Lasertechnik Berlin GmbH, 12489 Berlin, Germany;

关键词: laser-induced breakdown spectroscopy (LIBS);    coating thickness;    pulse duration comparison;    ultrashort laser pulses;    industrial application;   

DOI  :  10.3390/s19194133

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown