高重频声光门控自吸收免疫诱导击穿光谱技术分析研究 -

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高重频声光门控自吸收免疫诱导击穿光谱技术分析研究

doi:10.37188/CO.2023-0147

陈斐^{1, 2,},
王树青³,
程年恺⁴,
张婉飞⁵,
张岩⁶,
梁佳慧^{1, 2},
张雷^{1, 2,,},
王钢⁵,
马晓飞⁵,
刘珍荣⁵,
罗学彬⁵,
叶泽甫⁷,
朱竹军⁷,
尹王保^{1, 2,,},
肖连团^{1, 2},
贾锁堂^{1, 2}

1.
山西大学光谱研究所量子光学与光量子器件国家重点实验室, 山西太原 030006
2.
山西大学极端光学协同创新中心, 山西太原 030006
3.
中石油化工股份有限公司石油化工科学研究院, 北京 100083
4.
中国兵器科学研究院, 北京 100089
5.
山西新华防化装备研究院有限公司, 山西太原 030041
6.
西安工业大学光电工程学院, 陕西西安 710021
7.
山西格盟中美清洁能源研发中心有限公司, 山西太原 030032

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，主要从事诱导击穿多光谱融合检测、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
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- 被引次数:0
出版历程
- 收稿日期:2023-08-23
- 修回日期:2023-09-07
- 网络出版日期:2023-12-08

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

CHEN Fei^{1, 2,},
WANG Shu-qing³,
CHENG Nian-kai⁴,
ZHANG Wan-fei⁵,
ZHANG Yan⁶,
LIANG Jia-hui^{1, 2},
ZHANG Lei^{1, 2,,},
WANG Gang⁵,
MA Xiao-fei⁵,
LIU Zhen-rong⁵,
LUO Xue-bin⁵,
YE Ze-fu⁷,
ZHU Zhu-jun⁷,
YIN Wang-bao^{1, 2,,},
XIAO Lian-tuan^{1, 2},
JIA Suo-tang^{1, 2}

1.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
2.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
3.
National Energy R & D Center of Petroleum Refining Technology (RIPP, SINOPEC), Beijing 100083, China
4.
China Academy of Ordnance Science, Beijing 100089, China
5.
Shanxi Xinhua Chemical Defense Equipment Research Institute Co., Ltd., Taiyuan 030041, China
6.
School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, China
7.
Shanxi Gemeng US-China Clean Energy R & D Center Co., Ltd, Taiyuan 030032, China

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

Corresponding author:k1226@sxu.edu.cn;ywb65@sxu.edu.cn

摘要

摘要:
为了消除诱导击穿光谱技术（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，等离子体的特性受重复频率的影响进而会影响光谱信号的强度。在1 ~ 50 kHz 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 t _ot为426 ns。在重复频率为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 R ²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。
- 诱导击穿光谱/
- 自吸收免疫/
- 光学薄/
- 高重频器/
- 声光门控
Abstract:
To eliminate the self-absorption effect in laser-induced breakdown spectroscopy (LIBS) and improve the accuracy of elemental quantitative analysis, the device of self-absorption free laser-induced breakdown spectroscopy (SAF-LIBS) technology needs to be miniaturized to meet the requirement of convenient elemental analysis in industry. This paper presents a novel quantitative analysis technique, the high repetition rate acousto-optic gated SAF-LIBS method. To enhance integral spectral intensity, a high repetition rate laser is used to produce quasi-continuous plasmas. In addition, an AOM (acousto-optic modulator) serves as an optical gating switch, enabling the use of a compact charge-coupled device (CCD) spectrometer and AOM instead of the intensified charge coupled device (ICCD) and medium step grating spectrometer in conventional large-scale SAF-LIBS devices. The results in a self-absorption-free system that is less bulky and less expensive. After optimizing the system parameters, the quantitative analysis and prediction of the Al element in the sample was achieved. Experimental results show that plasma characteristics are impacted by the laser repetition rate, which affects the intensity of spectral signal. The doublet intensity of Al I 394.4 nm and Al I 396.15 nm is enhanced and then diminished at a laser repetition rate ranging from 1 kHz to 50 kHz, with the optimal repetition rate identified as being 10 kHz. The doublet line intensity ratios of Al decrease with delay time under different fiber collection angles. The highest signal-to-noise ratio is achieved at an angle of 45°, while the optimal optically thin time t _otis 426 ns at a certain integration time. Al is quantitatively analyzed and predicted at a laser repetition rate of 10 kHz, fiber collection angle of 45°, and delay time of 400 ns. The experimental results show that the calibration curve linearity of R ²is 0.982 and an average absolute prediction error of aluminum is reduced from 0.8% of single LIBS to 0.18%, which is equivalent to that of traditional SAF-LIBS. Additionally, the high repetition rate acousto-optic gating SAF-LIBS not only effectively eliminates continuous background radiation and broadens spectral lines in optically thick plasma, but also offers the advantages of miniaturization, low cost, convenience, and reliability. Therefore, this study plays a significant role in advancing SAF-LIBS technology from laboratory testing to industrial applications.
- laser-induced breakdown and spectroscopy/
- self-absorption free/
- optically thin/
- high repetition rate laser/
- acousto-optic gating

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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)

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图 2实验装置的工作时序

Figure 2.Working time sequence scheme of the experimental setup

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图 3压片样品

Figure 3.Press tablet sample

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图 4不同重复频率下Al原子双线

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

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图 5Al 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

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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

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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）t_ot值

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

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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

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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

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