Inorder to improve the quality of laser-induced low alloy steel plasma spectrum, the influence of carbon plate barrier to the plasma radiation intensity was studied. The laser, which is spectrum analytical system is composed of a high-energy neodymium glass laser used for abating samples, a multifunctional and automatic grating spectrometer, and a CCD data acquisition system,which is used for recording plasma spectra. The experimental results showed that when a carbon plate was used to interrupt the axial transmission of plasma, the quality of plasma spectrum could be increased. For instance, when the distance between the carbon plate and the sample surface was 10 mm, the spectral intensities of element Al> Mn, Fe and Cr increased around 25% ,37% ,24% and 51%than that without interruption of carbon plate; while spectral signal-to-background ratio increased about 16%, 23%, 11% and 34% .respectively. By measuring the electron temperature, electron density and sample ablation mass. The spectral enhancement mechanism with carbon plate barrier on axial transfer of plasma was studied.%为了改善激光诱导低合金钢等离子体的发射光谱质量,采用高能量钕玻璃脉冲激光激发样品,由组合式多功能光栅光谱仪和CCD光谱采集处理系统记录等离子体光谱,研究了碳片阻挡方法对等离子体辐射强度的影响.实验结果表明,当采用碳片阻挡等离子体轴向传递时,能够提高等离子体的光谱质量.例如,在碳片距离样品表面高度为10 mm时,元素Al、Mn、Fe和Cr的光谱强度比无碳片阻挡时分别提高了25％、37％、24％和51％,光谱信背比分别提高了16％、23％、11％和34％.通过测量等离子体的电子温度、电子密度以及样品蒸发量,研究了采用碳片阻挡等离子体轴向传递条件下光谱增强的机理.
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