光学学报, 2013, 33 (3): 0301007, 网络出版: 2013-01-25
紫外LED光纤耦合长程DOAS系统监测大气SO2和O3的研究
Detection of Atmospheric SO2 and O3 Using Optical Fiber Coupling Long-Path Differential Optical Absorption Spectroscopy System with UV Light Emitting Diodes
大气光学 紫外LED 光纤耦合 差分吸收光谱 O3测量 atmospheric optics UV light-emitting diodes optical fiber coupling differential optical absorption spectroscopy SO2 SO2 and O3 measurements
摘要
介绍了一种基于发光二极管 (LED) 的光纤耦合长程差分吸收光谱(LP-DOAS)系统，用于测量大气中的SO2和O3。根据SO2和O3所在的吸收波段，选择了两种不同波长的紫外LED作为系统光源。当吸收光程为700 m时，SO2和O3的探测限分别为0.8×10-9和7.4×10-9。将该系统测量结果与传统基于氙灯LP-DOAS的测量结果进行了对比，结果显示两者具有较好的一致性，测量SO2和O3的相关性分别为0.987和0.992。测量结果表明，通过光纤耦合方式来提高光源耦合效率后，采用以LED为光源的LP-DOAS系统来探测紫外波段的气体吸收是切实可行的。
Abstract
The measurements of atmospheric sulphur dioxide (SO2) and ozone (O3) using optical fiber based on light-emitting diode (LED) long-path differential optical absorption spectroscopy (LP-DOAS) system are presented. Two ultraviolet (UV) LED with different emission wavelength ranges are used as the light sources. The measurement results are compared to the SO2 and O3 levels measured by the conventional LP-DOAS with xenon arc lamp light source. The comparison result shows that they are in good agreement, and the correlation coefficients of SO2 and O3 measurements are 0.987 and 0.992, respectively. With 700 m measurement path, the detection limit of SO2 and O3 are 0.8×10-9 and 7.4×10-9, respectively. This indicates that the optical fiber-based LP-DOAS improves the light coupling efficiency, and is feasible for the detection of ultraviolet absorbing trace gases using UV-LED as the light source.
郑尼娜, 谢品华, 凌六一, 秦敏, 陈嘉乐, 江宇, 刘文清, 刘建国. 紫外LED光纤耦合长程DOAS系统监测大气SO2和O3的研究[J]. 光学学报, 2013, 33(3): 0301007. Zheng Nina, Xie Pinhua, Ling Liuyi, Qin Min, Chan Kalok, Jiang Yu, Liu Wenqing, Liu Jianguo. Detection of Atmospheric SO2 and O3 Using Optical Fiber Coupling Long-Path Differential Optical Absorption Spectroscopy System with UV Light Emitting Diodes[J]. Acta Optica Sinica, 2013, 33(3): 0301007.
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