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A theoretical study of the signal enhancement mechanism of coaxial DP-LIBS 认领 引用 被引量：1
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作者 宋震 王俊霄 +11 位作者 王钢 张雷 王树青 张婉飞 马晓飞 刘珍荣 罗学彬 马维光 叶泽甫 朱竹君 尹王保 贾锁堂 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第5期156-164,共9页
In the field of dual-pulse laser-induced breakdown spectroscopy(DP-LIBS)research,the pursuit of methods for determining pulse intervals and other parameters quickly and conveniently in order to achieve optimal spectra... In the field of dual-pulse laser-induced breakdown spectroscopy(DP-LIBS)research,the pursuit of methods for determining pulse intervals and other parameters quickly and conveniently in order to achieve optimal spectral signal enhancement is paramount.To aid researchers in identification of optimal signal enhancement conditions and more accurate interpretation of the underlying signal enhancement mechanisms,theoretical simulations of the spatiotemporal processes of coaxial DP-LIBS-induced plasma have been established in this work.Using a model based on laser ablation and two-dimensional axisymmetric fluid dynamics,plasma evolutions during aluminum–magnesium alloy laser ablation under single-pulse and coaxial dualpulse excitations have been simulated.The influences of factors,such as delay time,laser fluence,plasma temperature,and particle number density,on the DP-LIBS spectral signals are investigated.Under pulse intervals ranging from 50 to 1500 ns,the time evolutions of spectral line intensity,dual-pulse emission enhancement relative to the single-pulse results,laser irradiance,spatial distribution of plasma temperature and species number density,as well as laser irradiance shielded by plasma have been obtained.The study indicates that the main reason behind the radiation signal enhancement in coaxial DP-LIBS-induced plasma is attributed to the increased species number density and plasma temperature caused by the second laser,and it is inferred that the shielding effect of the plasma mainly occurs in the boundary layer of the stagnation point flow over the target surface.This research provides a theoretical basis for experimental research,parameter optimization,and signal enhancement tracing in DP-LIBS. 展开更多
关键词 laser-induced plasma radiation fluid dynamics model double pulse laser-induced breakdown spectroscopy(DP-LIBS) laser ablation signal enhancement mechanism
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基于FPGA的DP-LIBS延时发生器设计与评测 认领 引用
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作者 吴天宇 周勇 +1 位作者 胥成金 何康 《工业技术创新》 2023年第1期67-74,共8页
双脉冲激光诱导击穿光谱(DP-LIBS)技术是物质分析领域中的一种新兴分析技术,两束激光间的延时需要达到纳秒级精度方可满足技术应用需求。以标准的DP-LIBS激光器击打节奏为起点开展研究,确定最小延时。基于现场可编程门阵列(FPGA)开展系... 双脉冲激光诱导击穿光谱(DP-LIBS)技术是物质分析领域中的一种新兴分析技术,两束激光间的延时需要达到纳秒级精度方可满足技术应用需求。以标准的DP-LIBS激光器击打节奏为起点开展研究,确定最小延时。基于现场可编程门阵列(FPGA)开展系统整体设计:在Verilog-HDL语言环境下构建FPGA仿真程序架构;以EP4CE10E22C8N作为主芯片开展硬件设计,绘制PCB图,得到焊接电路板;基于C#的Winform框架进行上位机控制软件开发,通过矩阵按键的标签名称进行数字排序,以实现波形显示及输出。经评测,系统能够准确接收上位机指令产生相应的脉冲波形输出,脉冲间隔最小可低至10ns,软硬件协同处理效率高,满足DPLIBS实际应用需求。 展开更多
关键词 DP-LIBS 光谱分析 FPGA 延时发生器 Verilog-HDL 纳秒级精度
Signal Detection of Carbon in Iron-Based Alloy by Double-Pulse Laser-Induced Breakdown Spectroscopy 认领 引用 被引量：5
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作者 林晓梅 李晗 姚清华 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第11期953-957,共5页
Although single-pulse lasers are often used in traditional laser-induced breakdown spectroscopy （LIBS） measurements, their measurement outcomes are generally undesirable because of the low sensitivity of carbon in i... Although single-pulse lasers are often used in traditional laser-induced breakdown spectroscopy （LIBS） measurements, their measurement outcomes are generally undesirable because of the low sensitivity of carbon in iron-based alloys. In this article, a double-pulse laser was applied to improve the signal intensity of carbon. Both the inter-pulse delay and the combination of laser wavelengths in double-pulse laser-induced breakdown spectroscopy （DP-LIBS） were optimized in our experiment. At the optimized inter-pulse delay, the combination of a first laser of 532 nm and a second laser of 1,064 nm achieved the highest signal enhancement. The properties of the target also played a role in determining the mass ablation enhancement in DP-LIBS configuration. 展开更多
关键词 DP-LIBS carbon signal detection iron-based alloy
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双脉冲激光诱导击穿光谱结合多元定标法定量分析大豆油中的铅 认领 引用 被引量：3
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作者 吴宜青 欧阳静怡 +3 位作者 孙通 莫欣欣 刘津 刘木华 《分析测试学报》 CAS CSCD 北大核心 2016年第8期1015-1020,共6页
应用双脉冲激光诱导击穿光谱(DP-LIBS)对大豆油中的铅(Pb)含量进行检测。配制9个大豆油样品,采用一定规格圆柱形桐木对样品中Pb进行富集,然后通过Ava-Spec二通道高精度光谱仪采集其LIBS光谱信号。根据样品的LIBS谱线图和美国国家标准技... 应用双脉冲激光诱导击穿光谱(DP-LIBS)对大豆油中的铅(Pb)含量进行检测。配制9个大豆油样品,采用一定规格圆柱形桐木对样品中Pb进行富集,然后通过Ava-Spec二通道高精度光谱仪采集其LIBS光谱信号。根据样品的LIBS谱线图和美国国家标准技术研究所(NIST)原子光谱数据库,确定选用CaⅡ393.284 nm,CaⅡ396.752 nm,NⅡ399.399 nm和PbⅠ405.685 nm的特征谱线强度作为自变量,得到Pb含量的多元线性回归定量分析模型,并通过方差分析和t检验验证分析模型的可行性。结果表明,采用Pb元素直接定标法得到的平均相对误差约为16%,拟合度R2为0.981 8;采用多元线性回归模型得到的平均相对误差为7.25%,拟合度R2为0.997 1,3个检验样品的相对误差均在合理范围内。采用多元校正分析模型可以充分利用光谱中的有效信息,降低基体效应的影响,从而提高LIBS分析的准确性。 展开更多
关键词 双脉冲激光诱导击穿光谱(DP-LIBS) 多元定标 定量分析 大豆油 铅
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