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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Detection of atmospheric nitrogen dioxide using a miniaturised fibre-optic spectroscopy system and the ambient sunlight
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Detection of atmospheric nitrogen dioxide using a miniaturised fibre-optic spectroscopy system and the ambient sunlight

机译：使用小型光纤光谱系统和周围太阳光检测大气中的二氧化氮

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摘要

A miniaturised fibre-optic spectrometer based system is presented for direct detection of one of the major atmospheric pollutants, nitrogen dioxide, by absorption spectroscopy using the ambient sunlight as light source. The detection system consists of a 10 cm collimator assembly, a fibre-optic cable and a portable diode-array spectrometer. The absorbance spectrum of the open-path is calculated using a reference spectrum recorded when the nitrogen dioxide (NO2) concentration in the atmosphere is low. The relative concentration of the pollutant is calculated normalising the detected spectra and subtracting the background broadband spectrum from the specific NO2 absorbance features, since the broadband spectrum changes according to atmospheric conditions and solar intensity. Wavelengths between 400 and 500 nm are used in order to maximise sensitivity and to avoid interference from other species. Calibration is carried out using Tedlar sample bags of known concentration of the pollutant. A commercial differential optical absorption spectroscopy (DOAS) system is used as a reference standard detection system to compare the results with the new system. Results show that detection of NO2 at typical urban atmospheric levels has been achieved using an inexpensive field based fibre-optic spectrometer and a readily available, easy to align, light source. In addition the new system can be used to get a semi-quantitative estimation of the nitrogen dioxide concentration within errors of 20%. While keeping the typical benefits of open-path techniques, the new system has important advantages over them such as cost, simplicity and portability. (c) 2004 Elsevier B.V. All rights reserved.
机译：提出了一种基于微型光纤光谱仪的系统，该系统可通过使用周围太阳光作为光源的吸收光谱法直接检测主要的大气污染物中的二氧化氮。该检测系统包括一个10厘米的准直仪组件，一根光纤电缆和一个便携式二极管阵列光谱仪。当大气中的二氧化氮（NO2）浓度较低时，使用记录的参考光谱计算开路的吸收光谱。计算污染物的相对浓度，将检测到的光谱归一化，并从特定的NO2吸收特征中减去背景宽带光谱，因为宽带光谱会根据大气条件和太阳强度而变化。为了使灵敏度最大化并避免受到其他物质的干扰，使用了400至500 nm之间的波长。使用已知污染物浓度的Tedlar样品袋进行校准。商业差分光学吸收光谱（DOAS）系统用作参考标准检测系统，以将结果与新系统进行比较。结果表明，使用廉价的基于现场的光纤光谱仪和易于获得的，易于对准的光源，可以实现典型城市大气水平的NO2检测。另外，新系统可用于对二氧化氮浓度进行半定量估算，误差在20％以内。在保持开放路径技术的典型优势的同时，新系统相对于它们具有重要优势，例如成本，简单性和可移植性。 （c）2004 Elsevier B.V.保留所有权利。

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