摘要
为了提高激光诱导击穿光谱（LIBS）技术对低含量物质成分的检测能力,实验研究了高压（0.0~0.5 MPa）Ar环境气体对钢样品发射光谱的增强效应。利用高能量钕玻璃脉冲激光（约6 J）烧蚀样品,由组合式多功能光栅光谱仪和CCD光谱采集处理系统记录等离子体光谱,并通过测量光谱线强度计算了等离子体电子温度。实验结果表明,当样品烧蚀室内环境气压上升至0.5 MPa时,等离子体光谱强度比常压下提高了1.6~2.3倍,信背比（SBR）提高了28~47%;而等离子体温度比0.1 MPa气压条件下提高了1800 K。由此证明,增大样品烧蚀室内环境气压是提高激光等离子体光谱质量的一种有效方法。
In order to enhance the ability of laser-induced breakdown spectroscopy to detect low content composition,the enhancement effect of Ar atmosphere at high-pressure（0.0-0.5 MPa） on the emission spectrum of steel sample was studied.The sample is ablated by a neodymium glass high-energy pulse laser（～6 J）.The plasma spectrum was recorded by a multi-function grating spectrometer and a CCD spectral collecting-processing system.The plasma electronic temperature was calculated by the measured line intensities.The experimental results show that when the Ar pressure reaches 0.5 MPa,the spectral intensity and signal-to-background ratio of plasma increase by 1.6-2.3 times and 28%-47%,respectively;and the plasma electronic temperature increases by 1 800 K compared with that under 0.1 MPa.It proves to be an effective method to improve the quality of the laser plasma spectrum by increasing indoor environment pressure of sample ablation chamber.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2011年第3期474-477,共4页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(10804025)
河北省自然科学基金资助项目(A2006000951)
关键词
高气压
激光诱导等离子体
辐射强度
激发温度
钢样品
high pressure
laser-induced plasma
radiation intensity
excitation temperature
steel sample
