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高重频声光门控自吸收免疫激光诱导击穿光谱技术分析研究

陈斐 王树青 程年恺 张婉飞 张岩 梁佳慧 张雷 王钢 马晓飞 刘珍荣 罗学彬 叶泽甫 朱竹军 尹王保 肖连团 贾锁堂

陈斐, 王树青, 程年恺, 张婉飞, 张岩, 梁佳慧, 张雷, 王钢, 马晓飞, 刘珍荣, 罗学彬, 叶泽甫, 朱竹军, 尹王保, 肖连团, 贾锁堂. 高重频声光门控自吸收免疫激光诱导击穿光谱技术分析研究[J]. 中国光学(中英文), 2024, 17(2): 253-262. doi: 10.37188/CO.2023-0147
引用本文: 陈斐, 王树青, 程年恺, 张婉飞, 张岩, 梁佳慧, 张雷, 王钢, 马晓飞, 刘珍荣, 罗学彬, 叶泽甫, 朱竹军, 尹王保, 肖连团, 贾锁堂. 高重频声光门控自吸收免疫激光诱导击穿光谱技术分析研究[J]. 中国光学(中英文), 2024, 17(2): 253-262. doi: 10.37188/CO.2023-0147
CHEN Fei, WANG Shu-qing, CHENG Nian-kai, ZHANG Wan-fei, ZHANG Yan, LIANG Jia-hui, ZHANG Lei, WANG Gang, MA Xiao-fei, LIU Zhen-rong, LUO Xue-bin, YE Ze-fu, ZHU Zhu-jun, YIN Wang-bao, XIAO Lian-tuan, JIA Suo-tang. Study and analysis of self-absorption-free laser-induced breakdown spectroscopy with high-repetition rate acousto-optic gating[J]. Chinese Optics, 2024, 17(2): 253-262. doi: 10.37188/CO.2023-0147
Citation: CHEN Fei, WANG Shu-qing, CHENG Nian-kai, ZHANG Wan-fei, ZHANG Yan, LIANG Jia-hui, ZHANG Lei, WANG Gang, MA Xiao-fei, LIU Zhen-rong, LUO Xue-bin, YE Ze-fu, ZHU Zhu-jun, YIN Wang-bao, XIAO Lian-tuan, JIA Suo-tang. Study and analysis of self-absorption-free laser-induced breakdown spectroscopy with high-repetition rate acousto-optic gating[J]. Chinese Optics, 2024, 17(2): 253-262. doi: 10.37188/CO.2023-0147

高重频声光门控自吸收免疫激光诱导击穿光谱技术分析研究

doi: 10.37188/CO.2023-0147
基金项目: 国家重点研发计划(No. 2017YFA0304203); 长江学者和创新团队发展计划(No. IRT_17R70); 国家自然科学基金(No. 61975103,No. 61875108,No. 61775125,No. 11434007);山西省科技重大专项(No. 201804D131036);111计划(No. D18001);山西省“1331工程”重点学科建设计划
详细信息
    作者简介:

    张 雷(1981—),男,山西运城人,教授,博士生导师,2003 年于沈阳航空航天大学获得学士学位,2008 年于山西大学获得博士学位,主要从事激光诱导击穿多光谱融合检测、激光复合光谱立体侦察、机器视觉光学图像等技术的研究。E-mail:k1226@sxu.edu.cn

    尹王保(1965—),男,山西运城人,教授,博士生导师,1986 年、2003 年于山西大学分别获得学士和博士学位,研究领域为基于吸收光谱理论的污染气体、危险气体的光学检测和基于激光诱导感生光谱(LIBS)的物体成分检测。E-mail:ywb65@sxu.edu.cn

  • 中图分类号: O433.4

Study and analysis of self-absorption-free laser-induced breakdown spectroscopy with high-repetition rate acousto-optic gating

Funds: Supported by National Key R&D Program of China (No. 2017YFA0304203); Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (No. IRT_17R70); National Natural Science Foundation of China (No. 61975103, No. 61875108, No. 61775125 and No. 11434007); Major Special Science and Technology Projects in Shanxi (No. 201804D131036); 111 Project (No. D18001); Fund for Shanxi ‘1331KSC’
More Information
  • 摘要:

    为了消除激光诱导击穿光谱技术(laser-induced breakdown spectroscopy,LIBS)中的自吸收效应,提高元素定量分析的精确度,同时满足工业中便捷分析元素的要求,需将自吸收免疫激光诱导击穿光谱技术(self-absorption free laser-induced breakdown spectroscopy,SAF-LIBS)的装置小型化。本文提出了一项新型的高重频声光门控SAF-LIBS定量分析技术,使用高重频激光器产生准连续的等离子体以增强光谱强度,并将声光调制器(acousto-optic modulator,AOM)作为门控开关,从而使微型CCD光谱仪和AOM能够代替传统大型SAF-LIBS装置中的像增强探测器(intensified charge coupled device,ICCD)和中阶梯型光栅光谱仪,实现自吸收免疫的同时缩小了装置的体积,降低了装置的成本。将该系统参数进行优化选择后,对样品中的Al元素进行了定量分析和预测。实验结果表明,等离子体的特性受激光重复频率的影响进而会影响光谱信号的强度。在1 ~ 50 kHz激光重复频率范围内,Al I 394.4 nm和Al I 396.15 nm的双线强度先增强后减弱,确定最佳的激光重复频率为10 kHz。在不同的光纤采集角度下,Al的双线强度比随延迟时间的增加而减小,在45°处信噪比最高,且在一定的积分时间下,最佳光学薄时间tot为426 ns。在激光重复频率为10 kHz、光纤采集角为45°、延迟时间为400 ns的条件下,对Al元素进行定量分析和预测结果表明,Al元素定标曲线的线性度R2为0.982,平均绝对测量误差相对于单一LIBS的0.8%可以降低至0.18%。定量分析结果与传统大型SAF-LIBS装置的测量精度相持平。因此本高重频声光门控SAF-LIBS装置不仅有效地屏蔽了光学厚等离子体中的连续背景辐射和谱线加宽,同时具备小型化、低成本、高可靠性的优点,有助于推动SAF-LIBS技术由实验室走向工业应用。

     

  • 图 1  高重频声光门控SAF-LIBS实验装置(上)与AOM工作原理(下)

    Figure 1.  Experimental setup for high repetition rate acousto-optic gating SAF-LIBS (above) and principle diagram of AOM (below)

    图 2  实验装置的工作时序

    Figure 2.  Working time sequence scheme of the experimental setup

    图 3  压片样品

    Figure 3.  Press tablet sample

    图 4  不同激光重复频率下Al原子双线

    Figure 4.  Doublet lines of Al atom at different laser repetition rates

    图 5  Al I 396.15 nm所获定标曲线的线性度

    Figure 5.  Linearity of calibration curves by using Al I 396.15 nm

    图 6  不同光纤收集角时(a)Al双线强度比随延迟时间变化情况以及(b)最佳延迟时间与SNR的变化

    Figure 6.  (a) Temporal evolutions of Al doublet intensity ratio and (b) optimal delay times and SNRs at different fiber collection angles

    图 7  不同Al含量样品等离子体中(a)双线强度比随延迟时间的变化曲线及(b)tot

    Figure 7.  (a) Doublet intensity ratio varying with delay times and (b) tot values at different aluminum contents

    图 8  (a)延迟时间分别为200 ns、400 ns、800 ns时的Al定标曲线及预测值;(b)不同实验条件下对Al含量预测误差比较,序号1~4分别对应200 ns、400 ns、800 ns和无AOM

    Figure 8.  (a) Calibration curves and predicted results of Al at delay times of 200 ns, 400 ns and 800 ns; (b) comparison of prediction errors of Al under different experimental conditions, the numbers 1-4 here correspond to delay of 200 ns, 400 ns, 800 ns and without AOM, respectively

    表  1  不同压片样品中的Al含量

    Table  1.   Aluminum content in different press tablet samples

    样品编号 1 2 3 4 5 6 7 8 9 10
    占比(%) 5 6 7 8 9 10 11 13 16 19
    下载: 导出CSV
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  • 收稿日期:  2023-08-23
  • 修回日期:  2023-09-07
  • 网络出版日期:  2023-12-08

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