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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1.2μm,与不采用该门控信号放大器时所达到的2.9和6.2μm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。
In order to achieve high spatial resolution of elemental microscopic analysis, a gated signal amplifier based on the OPA 695 operational amplifier was fabricated for weak signal detection in an orthogonal double-pulsed laser-peeled laser-induced breakdown spectroscopy. The gated signal amplifier successfully eliminates the strong background of the plasmas in the laser plasma and selectively enlarges the weak atomic radiation signals to improve the spectral sensitivity and spatial resolution. The main aluminum and trace copper elements in the aluminum alloy standard were analyzed experimentally. Under the current experimental conditions, the horizontal spatial resolution reached about 0.9 and 1.2μm, respectively. Compared with the 2.9 and 6.2μm results compared to significant improvement. The gated signal amplifier has the advantages of low cost and has a good application value for weak signal detection in a strong background with a time-resolved feature.