激光除漆频率对LIBS准确性影响研究

Study on the impact of laser paint removal frequency on the accuracy of LIBS

验证激光诱导击穿光谱(Laser-Induced Breakdown Spectroscopy,LIBS)技术在千赫兹级激光条件下检测准确性对LIBS技术应用于大区域、高效率激光除漆过程监测具有重要意义。本文采用高频(kHz级)1064nm红外脉冲光纤激光器清洗飞机蒙皮漆层,结合能谱仪测试结果及原子光谱数据库数据,研究千赫兹激光对LIBS光谱谱峰波长和峰值强度的影响,并验证LIBS技术在千赫兹级激光除漆过程中的准确性。结果表明千赫兹谱峰较赫兹谱峰波长位置向蓝光区域偏移,偏移量不大于0.18nm。380nm~425nm范围内的谱峰完全消失,425nm~550nm范围内的谱峰信噪比下降。能谱仪测试结果与赫兹级LIBS光谱协同验证了千赫兹级激光条件下LIBS技术检测效果的准确性。表明在大区域、高效率飞机蒙皮激光除漆过程中,LIBS技术可用于除漆过程监测。本研究可为千赫兹级激光除漆过程LIBS监测提供参考。

In this paper,the detection accuracy of Laser-Induced Breakdown Spectroscopy(LIBS)technology under kHz laser conditions is verified,which is of great significance for the application of LIBS in the large-area,high-efficiency monitoring of laser paint removal processes.Firstly,a high-frequency(kHz)1064 nm infrared pulsed fiber laser is used to clean the paint layer on aircraft skin.By integrating results from an energy spectrometer and atomic spectral database data,the impact of kHz lasers on the wavelength positions and the peak intensity of LIBS spectral lines is investigated,and the accuracy of LIBS technology is verified during kHz laser de-painting processes.The results indicate that the wavelength position of the kHz peak is shifted towards the blue-light region compared with that of the Hz peak,with a shift no greater than 0.18 nm.The spectral peaks between 380 nm to 425 nm disappear completely,and the signal-to-noise ratio of peaks within the 425 nm to 550 nm range decreases.The spectrometer test results corroborating with kHz LIBS spectra validate the detection accuracy under kHz laser conditions,demonstrating that LIBS technology can be used for monitoring the laser paint removal process on large aircraft skin areas efficiently.The study provides a reference for LIBS monitoring in kHz laser de-painting processes.