Laser Precision Microfabrication (LPM) 2022
Poster
Automated homogeneity assessment of direct laser interference patterned surfaces using deep learning approach
CZ

Dr.-Ing. Christoph Zwahr

Zwahr, C. (Speaker)¹; Nitzsche, C.¹; Steege, T.¹; Stegert, A.¹
¹Fraunhofer IWS, Dresden

A machine learning algorithm based on a convolutional neural network (CNN) is trained with light microscope images of DLIP patterns to detect the surface homogeneity. 600 images of DLIP patterns with different quantity of homogeneity with line-like structures with spatial periods of 7 µm and different pattern conditions were labelled and used to train the model. The patterns were fabricated using a pulsed laser source with a pulse duration of 4 ns at a wavelength of 1053 nm on stainless steel substrates. For each spatial period, the pulse-to-pulse overlap and laser fluence were varied to obtain more or less homogeneous patterns. Microscopic images were taken of each pattern using a 20x magnification objective. The algorithm is able to detect and identify homogeneous DLIP patterns with an accuracy of 90 %. 

Abstract

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