Spectroscopy and Spectral Analysis, Volume. 33, Issue 7, 1729(2013)
Development of a Photoacoustic Spectroscopy System for the Measurement of Absorption Coefficient of Atmospheric Aerosols
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.
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LIU Qiang, NIU Ming-sheng, WANG Gui-shi, CAO Zhen-song, LIU Kun, CHEN Wei-dong, GAO Xiao-ming. Development of a Photoacoustic Spectroscopy System for the Measurement of Absorption Coefficient of Atmospheric Aerosols[J]. Spectroscopy and Spectral Analysis, 2013, 33(7): 1729
Received: Nov. 7, 2012
Accepted: --
Published Online: Sep. 30, 2013
The Author Email: Qiang LIU (lqsh6@126.com)