【摘要】 用探测束非聚焦构型,试验了池后透镜的焦距和位置对同轴脉冲热透镜信号特性及其远场信号强度分布的影响,讨论了构型几何参数之间的关系。在选定条件下,测定CCl₄中的苯,可测最低浓度1.12×10^-3mol/L,相当于4.5×10^-7cm吸收。更多还原

【Abstract】 Using unfocused probe beam optical configuration, the effects of focal length and position of the post-lens on the coaxial pulsed thermal lens signal features and intensity distribution on the detector plane in far-field were studied. The relationship among geometry parameters of this configuration was also discussed. Under optimized conditions, the determination of benzene in CCl4 was perfomed. Detectable minimum concentration of 1. 12×10-3 rnol/L was obtained, which correspons to an absorbance of 4. 6×10-7cm-1.更多还原