Development of a Photoacoustic Spectroscopy System for the Measurement of Absorption Coefficient of Atmospheric Aerosols
LIU Qiang1, 2, 3, NIU Ming-sheng3, WANG Gui-shi3, CAO Zhen-song2, LIU Kun3, CHEN Wei-dong3, 4, GAO Xiao-ming2,3*
1. Department of Optics & Optical Engineering, University of Science and Technology of China, Hefei 230026，China 2. Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences, Hefei 230031, China 3. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 4. Laboratoire de Physicochimie del’Atmosphère, Université du Littoral Cte d’Opale, 189A, AV, Maurice Schumann, 59140 Dunkerque, France
Abstract：In the present paper, the authors focus on the effect of the resonance frequency shift due to the changes in temperature and humidity on the PA signal, present several methods to control the noise derived form gas flow and vibration from the sampling pump. Based on the efforts mentioned above, a detection limit of 1.4×10-8 W·cm-1·Hz-1/2 was achieved for the measurement of atmospheric aerosols absorption coefficient. During the experiments, the PA cell was calibrated with the absorption of standard NO2 gas at 532 nm and the atmospheric aerosols were measured continuously. The measurement results show that the PAS is suitable for the real-time measurement of the absorption coefficient of atmospheric aerosols in their natural suspended state.
刘 强1, 2, 3，牛明生3，王贵师3，曹振松2，刘 锟3，陈卫东3，4，高晓明2，3* . 适用于测量大气气溶胶吸收系数的光声光谱系统的研究 [J]. 光谱学与光谱分析, 2013, 33(07): 1729-1733.
LIU Qiang1, 2, 3, NIU Ming-sheng3, WANG Gui-shi3, CAO Zhen-song2, LIU Kun3, CHEN Wei-dong3, 4, GAO Xiao-ming2,3*. Development of a Photoacoustic Spectroscopy System for the Measurement of Absorption Coefficient of Atmospheric Aerosols . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(07): 1729-1733.
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