空间约束中药材等离子体最佳探测时间研究  

Temporal characterization of space-confined plasma emission spectroscopy of Chinese herbal medicines

作　　者：陶翰飞 赵静怡 王浪 李业秋[1] 崔建丰[1,2] 岱钦 TAO Hanfei;ZHAO Jingyi;WANG Lang;LI Yeqiu;CUI Jianfeng;DAI Qin(College of Science,Shenyang Ligong University,Shenyang 110159,China;Anshan ZY Laser Technology Co.,Ltd,Anshan Liaoning 114044,China)

机构地区：[1]沈阳理工大学理学院,沈阳110159 [2]鞍山紫玉激光科技有限公司,辽宁鞍山114044

出　　处：《激光杂志》2025年第3期91-97,共7页Laser Journal

基　　金：国家重点研发计划(No.2022YFB4601603);辽宁省教育厅高等学校基本科研项目(No.LJKZ0262)。

摘　　要：利用激光诱导击穿光谱技术和空间约束方法对不同元素特征谱线的最佳探测延迟时间进行研究,建立等离子体热膨胀模型,模拟等离子体在不同空间约束深度和时间的热膨胀瞬态过程,分析了环境气压、温度和湿度的变化对结果的影响。对不同空间约束深度的中药材玉竹样品进行激光诱导击穿光谱检测实验,以MgⅠ285.12 nm和CaⅡ396.84 nm作为特征分析谱线,分析了空间约束深度和时间的变化对谱线强度的影响,并探究了激发光源输出特性的变化对谱线强度的影响。在激光能量为30 mJ,重复频率为1 Hz,最佳空间约束深度为1.9 mm的条件下谱线强度得到明显加强,Mg元素的最佳探测时间为0.5μs,而Ca元素的最佳探测时间为1.2μs,表明不同元素在相同空间约束深度下对谱线增强效果最佳的探测时间不同。The Laser-induced breakdown spectroscopy and spatial confinement method were used to study the optimal detection delay time of the characteristic spectral lines of different elements,to establish a plasma thermal expansion model,to simulate the thermal expansion transient process of the plasma at different spatial confinement depths and times,and to analyze the effects of changes in ambient air pressure,temperature and humidity on the results.Laser-induced breakdown spectroscopy test experiments were carried out on the samples of the traditional Chinese medicine yucca with different spatial confinement depths,using Mg Ⅰ 285.12 nm and Ca Ⅱ 396.84 nm as the characterized spectral lines to analyze the effects of changes in spatial confinement depth and time on the intensity of the spectral line,as well as the effects of changes in excitation light output characteristics on the spectral intensities were also explored.The spectral line intensities were significantly enhanced at a laser energy of 30 mJ,a repetition frequency of 1 Hz,and an optimal spatial confinement depth of 1.9 mm,and the optimal detection times were 0.5 μs for Mg and 1.2 μs for Ca,which indicated that the optimal detection times for different elements with the same spatial confinement depths were different for the enhancement of the spectral lines.

关 键 词：激光诱导击穿光谱 空间约束 时间分辨 最佳探测时间 

分 类 号：O433.4[机械工程—光学工程]