Experimental research on laser parallel processing of two-dimensional codes

Zhai Zhongsheng; Liu Chunli; Li Mengyu; Chen Bo; Liu Dun

doi:10.12086/oee.2021.210293

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Zhai Z S, Liu C L, Li M Y, et al. Experimental research on laser parallel processing of two-dimensional codes[J]. Opto-Electron Eng, 2021, 48(10): 210293. doi: 10.12086/oee.2021.210293

Citation:

Zhai Z S, Liu C L, Li M Y, et al. Experimental research on laser parallel processing of two-dimensional codes[J]. Opto-Electron Eng, 2021, 48(10): 210293. doi: 10.12086/oee.2021.210293

Experimental research on laser parallel processing of two-dimensional codes

Hubei Key Laboratory of Modern Manufacturing Quantity Engineering, School of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China

Fund Project: National Natural Science Foundation of China (32071457)

More Information

Corresponding author: Zhai Zhongsheng,zs.zhai@hbut.edu.cn

Received Date 09 September 2021

Revised Date 27 October 2021

Published Date 15 October 2021

Abstract

Abstract

Aiming at the problem that most of the output energy of laser single-beam processing of two-dimensional codes is wasted and the processing efficiency is low, this paper adopts a multi-beam parallel processing method to improve the processing efficiency. The simulation studies the effect of the QR code processing filling rate, and contrast on recognition rate, and recognition time, and obtains a QR code recognizable range. Then use the femtosecond laser based on the parallel processing technology of the spatial light modulator to conduct experiments, and analyze the contrast and processing fill rate of the experimental results. The analysis results show that within the range of the QR code reading evaluation standard, the greater the processing filling rate is, the lower the recognition rate and the longer the recognition time are; similarly, the lower the contrast is, the lower the recognition rate and the longer the recognition time are. At the same time, experiments were performed on the single-beam laser processing of two-dimensional codes. The comparison of processing time and other parameters of the parallel processing and single-beam processing was analyzed, and the efficiency of the parallel processing was about 10 times higher than that of the single-beam processing.
- QR code /
- laser marking /
- parallel processing /
- spatial light modulator

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References

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Overview

Overview

Overview: Laser processing is a non-contact processing method, which has the advantages of high energy density, good directionality, high coherence, and small heat-affected zone. It is favored in the field of industrial processing. Traditional laser processing is mainly focused on the single-beam laser marking method using a scanning galvanometer. This marking method has a clear and high-precision pattern and can be processed at any position. This method has low processing efficiency and long marking production time. In addition, the laser output single pulse energy is much higher than the required energy during processing. If single beam processing is used, most of the laser output energy is wasted and the energy utilization rate is low. Parallel processing technology can divide a single beam into multiple beams, and can improve processing efficiency, laser energy utilization. Also, the above problems can effectively solved. Aiming at the problem of low energy utilization and processing efficiency in femtosecond laser micro-machining, this paper adopts the femtosecond parallel processing method based on the spatial light modulator.

Nowadays, there are many researches on the laser marking two-dimensional codes, but there are few researches on the relationship between the reading quality of two-dimensional codes and its filling rate or contrast. Most of them focus on finding suitable processing parameters. Therefore, this article first simulates the processing filling rate and different contrasts of the two-dimensional code. The simulation method is as follows: first, to gradually increase the radius on a fixed circle center until it is tangent, and change the gray scale of the data circular area; second, use the WeChat scan code function to count the recognition time and calculate the recognition rate; finally, based on the basis of the parallel processing of the spatial light modulator, using femtosecond laser to process the two-dimensional code. It can be obtained that the larger the processing filling rate is, the smaller the gap is, the easier it is to be recognized within the range of the two-dimensional code reading evaluation standard. The observation of the contrast is verified by different processing times, and the result obtained has little change in contrast. Because the contrast meets the simulation upon request, the results can be scanned. At the same time, we conducted a single-beam laser processing experiment on the two-dimensional code, and compared the important parameters such as processing time of single-beam laser processing and parallel processing. The parallel processing efficiency of multiple light beams obtained by splitting 60 beams at the same time is about ten times higher than the processing efficiency under the galvanometer.