CAJ | 학술논문

为了减小激光诱导等离子体中光谱线自吸收对分析结果的影响，提高发射光谱的谱线质量，实验利用组合式多功能光栅光谱仪和CCD探测器等组成的光谱分析系统记录光谱信息，采用平面反射镜装置对激光等离子体进行约束，比较了不同实验条件下光谱线的线型演化过程，并且通过测量等离子体的温度、电子密度以及样品蒸发量给出了合理解释。实验结果表明，当采用合适的平面反射镜装置约束激光等离子体时，等离子体的轴向温度有所升高，径向温度分布趋于均匀；等离子体的电子密度有较大幅度的提高；然而，样品蒸发量却有比较明显的减小。这几个方面的原因能够有效地降低光谱线的自吸收程度。由此可见，利用平面反射镜装置优化实验条件以后，可以有效减小激光诱导等离子体发射光谱的自吸收效应，在常量元素的定量分析中，允许选择灵敏谱线作为分析线，这为提高激光诱导击穿光谱技术的精确测量奠定了基础。
위료감소격광유도등리자체중광보선자흡수대분석결과적영향，제고발사광보적보선질량，실험이용조합식다공능광책광보의화CCD탐측기등조성적광보분석계통기록광보신식，채용평면반사경장치대격광등리자체진행약속，비교료불동실험조건하광보선적선형연화과정，병차통과측량등리자체적온도、전자밀도이급양품증발량급출료합리해석。실험결과표명，당채용합괄적평면반사경장치약속격광등리자체시，등리자체적축향온도유소승고，경향온도분포추우균균；등리자체적전자밀도유교대폭도적제고；연이，양품증발량각유비교명현적감소。저궤개방면적원인능구유효지강저광보선적자흡수정도。유차가견，이용평면반사경장치우화실험조건이후，가이유효감소격광유도등리자체발사광보적자흡수효응，재상량원소적정량분석중，윤허선택령민보선작위분석선，저위제고격광유도격천광보기술적정학측량전정료기출。
In order to reduce the effect of the spectral line self-absorption on the analysis result in the laser induced plasma and enhance the qualities of spectrum ,the spectral information was recorded by the spectral analysis system consisting of a modular multifunctional grating spectrometer and a CCD detector etc .,and the electron temperature and electron density of the plasma were measured with the spectroscopic methods .A plane mirror device was used to constraint the laser plasma ,and a reasonable explanation was got through comparing the linear evolution under different experimental conditions and measuring the tempera-ture ,electronic density and sample evaporation .The result shows that when an appropriate plane mirror device was used to con-straint the laser plasma ,the axial temperature of the plasma increased and the radial distribution of the plasma becomes uniform ;the electron density increased dramatically ;however ,obviously sample evaporation decreased ,which may be the reasons for be-ing able to effectively reduce the level of self-absorption spectral lines .Therefore ,the plane mirror device could reduce the self-absorption effect in the laser-induced plasma .This makes it possible to choose a sensitive line that acts as analysis line in the quantitative analysis of the major elements .In other words ,this promotes the measurement precision in the laser-induced break-down spectroscopy .