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用门控信号放大器提高激光诱导击穿光谱的空间分辨率

Improvement of the Spatial Resolution of Laser-Induced Breakdown Spectroscopy with a Gated Signal Amplifier

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摘要

为了实现高空间分辨的元素显微分析, 基于OPA 695运算放大器制作了一种门控信号放大器, 用于正交双脉冲激光剥离激光诱导击穿光谱中的微弱信号检测。该门控信号放大器成功地消除了激光等离子体中强的电子轫致辐射背景的干扰, 选择放大了微弱的原子辐射信号, 提高了光谱分析的灵敏度及其空间分辨率。实验分析了铝合金标样中的主量铝元素和微量铜元素, 当前实验条件下, 其横向空间分辨率分别达到约0.9和1.2 μm, 与不采用该门控信号放大器时所达到的2.9和6.2 μm的结果相比有明显的改善。该门控信号放大器具有低成本的优势, 对具有时间分辨特点的强背景下的微弱信号检测具有较好的应用价值。

Abstract

In order to realize high spatial resolution elemental microanalysis, a gated signal amplifier is designed based on OPA 695 operational amplifier and is applied in weak signal detection in orthogonal dual-pulse laser-ablation laser-induced breakdown spectroscopy. This gated amplifier rejected the influence of strong electronic Bremsstrahlung emission successfully, and the weak atomic emission could be selectively amplified, thus the spectral analysis sensitivity and spatial resolution could be improved. Major aluminum and minor copper elements in an aluminum standard sample are analyzed experimentally. Under current experimental condition, the spatial resolution has been reached 0.9 and 1.2 μm while analyzing aluminum and copper, respectively. These spatial resolutions are significantly improved in comparison with 2.9 μm for aluminum and 6.2 μm for copper obtained experimentally without using this gated signal amplifier. This gated amplifier is low cost and is helpful for high sensitive detection of weak signal accompanied with strong and time-resolvable background.

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中图分类号:O433.4

DOI:10.3788/cjl201744.0411003

所属栏目:光谱学

基金项目:国家973计划(2012CB921900)、国家自然科学基金(11274123, 11304100)

收稿日期:2016-12-06

修改稿日期:2017-01-11

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作者单位    点击查看

张建华:华南理工大学物理与光电学院, 广东 广州 510641
陈钰琦:华南理工大学物理与光电学院, 广东 广州 510641
李润华:华南理工大学物理与光电学院, 广东 广州 510641

联系人作者:张建华(986937085@qq.com)

备注:张建华(1990-)男, 硕士研究生, 主要从事光电子学与光电技术等方面的研究。

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引用该论文

Zhang Jianhua,Chen Yuqi,Li Runhua. Improvement of the Spatial Resolution of Laser-Induced Breakdown Spectroscopy with a Gated Signal Amplifier[J]. Chinese Journal of Lasers, 2017, 44(4): 0411003

张建华,陈钰琦,李润华. 用门控信号放大器提高激光诱导击穿光谱的空间分辨率[J]. 中国激光, 2017, 44(4): 0411003

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