Lyubomir Lazov, Edmunds Teirumnieks, Nikolay Angelov, Erika Teirumnieka

Last modified: 23.04.2019


A new methodology for determining and optimizing the contrast of the technological laser marking process has been developed. It can evaluate the quality of the markings regardless of the type of material and the type of laser system. To perform the test analysis, a specialized test field is programmed, which including the change of two of the main parameters influencing the marking process: the linear energy density (LED) and the linear density of the pulses (LDI). Marking of a test field consisting of squares of a certain size is done by means of a raster marking method with a constant step between the lines. The results are processed with a digital camera and specialized software. The maximum blackening is compared with the background of all fields and is juxtaposed with the effective energy needed to obtain a certain contrast. Several consecutive iterations are made, with each of the following experiments excluding the variants with least contrast. Thus, the study consistently brings the result to a minimum working area of the basic technological parameters, providing the user's desired contrast of the marking. The developed author's method of automatically determining the contrast of the laser marking reduces the time for preliminary experimental research and gives a reliable and subjectively absent way of qualitatively marking different types of industrial products.


method; laser marking; software; digital camera; contrast; linear energy density; linear density of the pulses


[1]     Velotti, C., A. Astarita, C. Leone, S. Genna , F. Minutolo, A. Squillace, Laser marking of titanium coating for aerospace applications, Procedia CIRP 41, 2016, pp. 975 – 980

[2]     Sobotova, L. P. Demec, P. Laser marking of metal materials. Modern Machinery Science Journal, 2015, pp. 808-812.

[3]     Valiulin A., Gorniy S., Grechco Y., Patrov M., Yudin K., Yurevich V. Lazerna markirovka materialov. Nauchno-technicheskij zhurnal Fotonika, 2007, 3, pp 16-22 (in Russian).

[4]     Jianmei Li, Aiqun Wang, Yusong Wuab, ZhuoMa, Xinxin Fang, LiangTao, Experimental investigation and mathematical modeling of laser marking two-dimensional barcodes on surfaces of aluminum alloy, Journal of Manufacturing Processes, Volume 21, January 2016, pp 141-152.

[5]     Han A., D. Gubencu, Analysis of the Laser Marking Technologies, Nonconventional Technologies Review, № 4, 2008, pp. 17-22.

[6]     Lazov L., Angelov N. Vliyaniye na nyakoi faktori vyrhu procesa na lazerno markirane na izdeliya ot metali i splavi. mezhdunarodna nauchna konferenciya UNITEH`11. Gabrovo, 18-19 noembri 2011 (in Bulgarian)

[7]     Angelov N. Optimizacija na procesa markirane s lazerno lychenie na obrazci ot instrumentalna stomana. Disertacionen trud za pridobivane na stepen doktor. TU-Gabrovo, 2011 (in Bulgarian)





ERDF co-funded project "Funding of international projects in research and innovation at Rezekne Academy of Technologies" No.