[Measurement and retrieval of indicators for fast VOCs atmospheric photochemistry with differential optical absorption spectroscopy].
Featuring excellent response characteristics and detection sensitivity and with much lower operational cost, differential optical absorption spectroscopy (DOAS) can be a powerful tool to trace concentration variation of trace indicators -O3, Ox (O3 + NO2) and HCHO for fast VOCs atmospheric photochemistry. But it's difficult to measure those gases accurately because of trace concentration. Here using a self-made DOAS system, the accurate measurement of those indicators was achieved through improving the ratio of signal to noise ratio and correcting the background scattering light; the retrieving method of those indicators was developed through eliminating the temperature effect of absorption cross section, accurately removing the intrinsic structure and lamp structure of spectrum. The preference of different spectral windows that could be used for the concentration retrieval of those indicators was analyzed and compared including interfering factors, results retrieved and the accuracy.
Key Laboratory of Environmental Optical & Technology, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. pengfm@aiofm.ac.cn
Fu-Min
FM
Peng
Pin-Hua
PH
Xie
Shi-Yong
SY
Shao
Yu-Jin
YJ
Li
Yi-Hui
YH
Lin
Su-Wen
SW
Li
Min
M
Qin
Wen-Qing
WQ
Liu