In order to study the characteristics of laser-induced breakdown spectroscopy(LIBS), the optimal size of cavity(D = 5 mm, H = 4 mm) was obtained using the aluminum cylindrical cavities with different diameters (from 2 mm to 6 mm)and heights(from 1 mm to 6 mm) in LIBS and the optimal size of Au-NPs(D = 20 nm) was obtained by depositing Au-NPs (10 nm, 20 nm, 30 nm in particle diameter) on the shot of pure copper sample surface that was cleaned by laser. The enhancement factor is about 22.5, 5.4, 34.3 under the confinement of the optimal cavity, the action of the optimal Au-NPs and the combination of the optimal cavity and optimal Au-NPs, respectively. The plasma temperatures, and SNR, were calculated and researched under different conditions. Experiments have shown that cavity confinement can increase the electron temperature of the plasma, while under the Au-NPs action, the electron temperature hardly changes. Compared with zero confinement, Au-NPs action and cavity confinement can all improve the SNR of the plasma spectrum, but the SNR is the best with the combination of the optimal cavity and optimal Au-NPs. The enhancement principle was analyzed by shock wave theory and properties of Au-NPs.

为了研究激光诱导击穿光谱法（LIBS）的特性，使用不同直径（2 mm至6 mm）的铝制圆柱型腔，获得了最佳腔体尺寸（D = 5 mm，H = 4 mm）在LIBS中的高度和高度（从1毫米到6毫米）和Au-NPs的最佳尺寸（D = 20 nm）是通过将Au-NPs（粒径分别为10 nm，20 nm，30 nm）沉积而获得的。激光清洗过的纯铜样品表面。在最佳腔的限制，最佳Au-NP的作用以及最佳腔和最佳Au-NP的组合下，增强因子分别为约22.5、5.4、34.3。在不同条件下计算并研究了等离子体温度和SNR。实验表明，腔约束可以提高等离子体的电子温度，在金纳米粒子的作用下，电子温度几乎不变。与零约束相比，Au-NPs的作用和腔体的约束都可以改善等离子体光谱的SNR，但是将最佳腔体和最优Au-NPs结合使用时，SNR最佳。通过冲击波理论和金纳米粒子的性质分析了增强原理。