强脉冲激光激发的热透镜光度分析法  

Thermal Lens Spectrophotometry Based on Strong Pulsed Laser Excitation

作　　者：邓延倬[1] 曹建文[1] 刘村 陈观铨[1] 曾云鹗[2] Deng Yanzhuo;Cao Jianwen;Liu Cun;Chen Guanquan;Zeng Yun'e(Centre of Analysis and Testing,Wuhan University,Wuhan;Department of Chemistry,Wuhan University,Wuhan)

机构地区：[1]武汉大学分析测试中心 [2]武汉大学化学系

出　　处：《高等学校化学学报》1987年第6期495-498,共4页Chemical Journal of Chinese Universities

基　　金：中国科学院科学基金资助课题。

摘　　要：用自装的热透镜测量装置,观察了强脉冲激光作用下的热透镜行为。测量丙酮/水混合液中的Cocl_(2),检测限为3×10^(-7)M,相当于6×10^(-6)的吸光度。将差分放大技术用于热透镜测量,降低了He-Ne激光振幅噪声的影响,改善了信噪比。The thermal lens effects based on the strong pulsed laser excitation were observed by using the home-made experimental apparatus.In acetone-water mixture concentrations of CoCl2as low as 3×10^(-7)M have been determined with present setup,which corresponds to an absorbance of 6×10^(-6).In thermal lens measurements the noise level due to shot-term instability of the He-Ne laser output amplitude can be reduced down by the use of differential amplification technique,thus the S/N ratio is improved appreciably.

关 键 词：热透镜 光度分析法 强脉冲激光 差分放大 振幅噪声 水混合液 信噪比 吸光度 

分 类 号：TN2[电子电信—物理电子学]