本文介绍了差分光学吸收光谱法(DOAS)测量大气污染气体浓度的基本原理.DOAS方法就是利用氙灯发出的紫外-可见光,经望远镜准直后再经过一段距离的传输,由望远镜来接收.在传输中,由于各种不同的分子在不同的波段对光有不同的吸收特征,使光谱具有了污染物的特征,再通过与光源发出的光进行比较,反演这些气体在大气中浓度.我们将DOAS方法应用在监测有机物上,在分析光谱的过程中,应用多项式拟合和最小二乘法,从而精确地从测量光谱中来反演出大气中污染气体的浓度.文中用DOAS方法测量了苯和甲苯的样品,并分析了结果,结果和理论吻合.可为环境中有机污染物监测提供可靠的方法.
参考文献
| [1] | Grifflth P R. Applied Spectroscopy, 1977, 31:497 |
| [2] | Platt U, Perner D. Simultaneous measurements of atmospheric CH2O, O3 and NO2 by differential optical absorption [J]. Geophys. Res, 1979, 84:6329-6335 |
| [3] | Noxon J F. Nitrogen doixide in the stratosphere and troposphere measurement by ground-based absorption spectroscopy [J]. Science, 1975, 189:547-549 |
| [4] | Axelsson H. Measurement of aromatic hydrocarbons with the DOAS technique [J]. Applied Spectroscopy, 1995,49:1254-1260 |
| [5] | Kourtides K, Ziomas I. Benzene and toluene levels measured with a commercial DOAS system in Thessaloniki,Greece [J]. Atmospheric Environment, 2000, 34:1471-1480 |
| [6] | Plane John M C, Chiafu N. Differential optical absorption spectrometer for measuring atmospheric trace gases [J]. Rev. Sci. Instrum, 1995, 63(3): 1867-1876 |
| [7] | Zhou Bin, Liu Wenqing, Cui Yanjun et al. The studying of data analysis in differential optical absorption spectroscopy for measuring air pollutants [J].Acta Physica Sinica(物理学报),2001,50(9):1818-1823(in Chinese) |
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