微波探针对叶菜激光诱导击穿光谱信号增强效果的影响

许方豪; 刘木华; 陈添兵; 陈金印; 罗子奕; 何秀文; 周华茂; 林金龙; 姚明印

doi:doi:10.3788/lop55.103005

激光与光电子学进展, 2018, 55 (10): 103005, 网络出版: 2018-10-14

微波探针对叶菜激光诱导击穿光谱信号增强效果的影响下载： 524次

Effect of Microwave Probes on Enhancement of Laser-Induced Breakdown Spectral Signal of Leaf Vegetable

论文大纲

许方豪 ^1,2刘木华 ^1,2陈添兵 ^1,2陈金印 ³罗子奕 ^1,2何秀文 ^1,2周华茂 ^1,2林金龙 ^1,2姚明印 ^1,2,*

作者单位

¹ 江西农业大学工学院, 江西南昌 330045

² 江西省现代农业装备重点实验室, 江西南昌 330045

³ 江西省果蔬采后处理关键技术与质量安全协同创新中心, 江西南昌 330045

光谱学激光诱导击穿光谱微波辅助增强微波探针等离子体 spectroscopy laser-induced breakdown spectroscopy enhancement microwave assisted microwave probe plasma

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摘要

微波产生形式会影响激光诱导击穿光谱(LIBS)中等离子体光谱信号的强度和稳定性。实验选择重金属镉(Cd)质量分数为1.5×10-5的叶菜样品作为研究对象, 对比分析了双针、单针、环形、双环4种微波探针和前、中、后3个探针位置处传导微波对等离子体光谱信号强度和稳定性的影响, 以优化微波辅助LIBS(MA-LIBS)实验中的微波作用形式, 达到更好的辅助增强效果。分析MA-LIBS光谱图发现, Cd元素的等离子体光谱信号增强了2.58倍, Si、P元素的等离子体光谱信号强度分别增强了2.70倍和3.08倍, 有较好的增强效果。这表明：选择合适形状的微波探针和微波加载位置可以提高微波辅助增强效果, 增强LIBS技术在低浓度样品检测方面的应用性能。

Abstract

The methods that are used to produce microwaves can affect the strength and stability of plasma spectral signal in laser-induced breakdown spectroscopy (LIBS). Leaf vegetables that contain cadmium (Cd) at mass fraction of 1.5×10-5 are used as the subjects of this study. The influences of microwave probe with four shapes, such as the single-needle, double-needle, single-ring, and double-rings microwave probes, are studied. The three microwave loading positions, which include the front, middle, and end of the probes, are also investigated. The form of microwave function in the microwave assisted LIBS (MA-LIBS) experiment is optimized to achieve better auxiliary enhancement effect. After analyzing the spectral lines of the MA-LIBS, we find that the plasma spectral signal of Cd element is increased by 2.58 times, whereas Si and P elements is increased by 2.70 and 3.08 times, respectively. Suitable microwave probe shapes and loading positions can improve the effects of microwave-assisted enhancement, which further improves the performance of the LIBS technology in the application fields.

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许方豪, 刘木华, 陈添兵, 陈金印, 罗子奕, 何秀文, 周华茂, 林金龙, 姚明印. 微波探针对叶菜激光诱导击穿光谱信号增强效果的影响[J]. 激光与光电子学进展, 2018, 55(10): 103005. Xu Fanghao, Liu Muhua, Chen Tianbing, Chen Jinyin, Luo Ziyi, He Xiuwen, Zhou Huamao, Lin Jinlong, Yao Mingyin. Effect of Microwave Probes on Enhancement of Laser-Induced Breakdown Spectral Signal of Leaf Vegetable[J]. Laser & Optoelectronics Progress, 2018, 55(10): 103005.

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