光学学报, 2014, 34 (1): 0101001, 网络出版: 2013-12-24
大气气溶胶消光系数测量新方法 下载: 505次
New Method of Aerosol Extinction Coefficient Measurement
摘要
利用光在镀膜玻璃管中传输的特点,介绍了一种测量大气气溶胶消光系数的新方法。该方法将某一波长的光以一定角度入射到充满气溶胶的玻璃管中,经管壁的多次折返大大增加了光程,气溶胶对光的衰减信息可以通过玻璃管两端的探测器测量得到,利用比值计算方法消除光电转换过程中因光强波动、管壁不均匀以及分子散射等带来的测量误差,提高了气溶胶消光系数测量的灵敏度。将用该方法测量气溶胶在波长550 nm上的消光系数,与能见度仪测量结果对比表明此方法测量结果是合理的,且该方法具有原理简单、操作方便等特点。
Abstract
A new method is proposed for measurement of aerosol extinction coefficient by taking advantage of the characteristic of light transmission through coated glass tubes. When a ray of light of a particular wavelength penetrates through a glass tube filled with aerosols at a certain angle, the optical path length will be greatly increased due to multiple reflection of the light on the tube wall, and the amount of light diminished by aerosols can be measured by the sensors at both ends of the glass tube. The ratio calculation method is used to remove the effect of measurement errors caused by the light intensity fluctuation, uneven tube wall, molecular scattering, etc. during the photoelectric conversion. The sensitivity for measuring the extinction coefficients of aerosols is raised. Finally, this method is used to measure the extinction coefficients of aerosols in the wavelength of 550 nm. Compared with the results obtained with a visibility meter, the results obtained with this method are reasonable. In addition, based on simple principles, this method can be easily applied.
宫纯文, 李学彬, 李建玉, 曹亚楠, 朱文越, 徐青山, 魏合理. 大气气溶胶消光系数测量新方法[J]. 光学学报, 2014, 34(1): 0101001. Gong Chunwen, Li Xuebin, Li Jianyu, Cao Yanan, Zhu Wenyue, Xu Qingshan, Wei Heli. New Method of Aerosol Extinction Coefficient Measurement[J]. Acta Optica Sinica, 2014, 34(1): 0101001.