[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 x 10(-8) W x cm(-1) x 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.
Department of Optics & Optical Engineering, University of Science and Technology of China, Hefei 230026, China. lqsh6@126.com
Qiang
Q
Liu
Ming-Sheng
MS
Niu
Gui-Shi
GS
Wang
Zhen-Song
ZS
Cao
Kun
K
Liu
Wei-Dong
WD
Chen
Xiao-Ming
XM
Gao