Laser cleaning process monitoring method based on acoustic emission technology

Abstract

The invention discloses a laser cleaning process monitoring method based on an acoustic emission technology. A monitoring system is composed of a near-infrared nanosecond optical fiber laser processing system, a data acquisition card, preamplifiers, a signal cable and acoustic emission sensors. According to the principle of the laser cleaning process monitoring method, the cleaning effect is subjected to real-time and non-destructive monitoring based on the laser cleaning process of the acoustic emission technology; a mutual mathematical relation between the cleaning effect (the quantity of residual rust materials on the surfaces of workpieces) and the amplitude of acoustic emission signals is obtained, setting of laser processing parameters is controlled in real time, and thus laser cleaning is subjected to online and non-destructive monitoring; besides, the acoustic emission sensors are directly arranged on the surfaces of rust layers of the workpieces, the interference of other signals is reduced, and the reliability of the collected acoustic emission signals is improved. According to the monitoring system and method, the structure and use are very simple and reasonable, the precision is high, the performance is stable, the problem that an existing laser cleaning technology does not have a real-time detection function is solved, and the cleaning quality and efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of monitoring the laser cleaning process, in particular to the monitoring technology of the laser cleaning process. Background technique [0002] Laser cleaning technology uses pulsed laser with high peak power to irradiate the surface of the workpiece, so that the pollutants, rust or paint layer on the surface absorb laser energy and then peel off or evaporate instantly after a series of changes, and finally be effectively removed from the substrate. Compared with the traditional cleaning process, laser cleaning has obvious advantages. The main performance is that the non-mechanical contact process will not cause mechanical damage to the workpiece. The laser directionality is good, which can achieve precise positioning of the cleaning area and can adapt to complex curved surfaces. It has no flying dust. pollution, energy saving and environmental protection. [0003] However, the mechanism of laser cleaning...

AI Technical Summary

Problems solved by technology

Related to the practical application of laser cleaning technology, such as traditional spectral analysis technology and CCD optical imaging technology and other monitoring technologies, the equipment is expensive, the anti-interference ability is poor, and the signal processing is cumbersome.

Images