基于LIBS的GdFe合金材料快速检测技术研究

Research on Rapid Detection Technology of GdFe Alloy Material Based on LIBS

为了明晰LIBS(激光诱导击穿光谱)技术检测稀土合金材料的光谱特点,进一步开发基于LIBS的快速检测方法,推动LIBS技术在稀土领域的应用。利用激光诱导击穿光谱仪对GdFe合金材料激发光谱,结合信号强度及背景噪音,研究确定了最佳设置参数。分别考察激光器和光谱仪的参数设置对光谱的影响,根据激发光谱中相关谱线的变化趋势,探讨GdFe合金材料的LIBS检测方法。实验发现,GdFe合金样品与激光孔(Laser aperture)的距离(Z值)、激光能量和积分时间是影响LIBS光谱信号强度和背景噪音的关键参数。因金属和合金样品表面常覆盖氧化层,考察了脉冲激光的预剥蚀次数对光谱稳定性的影响,研究得出,在双脉冲均为164 mJ激光能量的激发下,预剥蚀1次可保证光谱效果。同时研究了两个激光器同时激发和延迟激发对GdFe合金光谱成因的影响,发现单脉冲激发与双脉冲同时激发所得光谱的信号强度并非两束脉冲单独激发的累加信号。通过光谱分析,确定了Z值0.8 mm、两个激光器的脉冲能量164 mJ、积分时间12μs、脉冲延时时间0μs,GdFe合金材料的光谱效果最佳,可为GdFe合金材料的LIBS检测方法建立提供参考,拓展LIBS技术在稀土领域的应用,为稀土合金产品的快速检测技术发展提供基础研究数据。

In order to clarify the spectral characteristics of rare earth alloy materials detected by laser-induced breakdown spectroscopy(LIBS)technology,a rapid detection method based on LIBS is further developed to promote its application in the field of rare earth.In this paper,the excitation spectrum of GdFe alloy material with laser induced breakdown spectrometer,combined with signal intensity and background noise,was studied and the optimum parameters were determined.The influence of the parameters of laser and spectrometer on the spectrum was investigated,and the LIBS detection method of GdFe alloy was discussed according to the trend of the relevant spectral lines in the excitation spectrum.It was found that the distance(Z value)between GdFe alloy sample and laser aperture,laser energy and integration time were the key parameters affecting the signal intensity and background noise of LIBS spectrum.Because the surface of metal and alloy samples was often covered with oxide layer,the influence of pre-denudation times of pulsed laser on spectral stability was also discussed.It was concluded that under the excitation of double pulses of 164 mJ laser energy,the spectral effect was guaranteed by pre-denudation once.The effect of simultaneous excitation and delayed excitation of two lasers on the origin of GdFe alloy spectra was also explored.It was found that the signal intensity of the spectra obtained from the simultaneous excitation of single pulse and double pulse was not the cumulative signal of the two pulses.Through spectral analysis,it was determined that the Z-value was 0.8 mm,the pulse energy of the two lasers was 164 mJ,the integration time was 12μs,and the pulse delay time was 0μs.Under these conditions,the spectral effect of GdFe alloy was the best.This study can provide reference for the establishment of LIBS detection methods for GdFe alloy materials,expand the application of LIBS technology in the field of rare earth,and provide basic research data for the development of rapid detection technology for rare earth alloy products.