Videla Fabián A, Schinca Daniel C, Tocho Jorge O
Departemento Fisicomatematica, Facultad de Ingeneria, Universidad Nacional de La Plata and Centro de Investigaciones Opticas, CC124 C P:B1902 WAB, La Plata, Argentina.
Appl Opt. 2003 Jun 20;42(18):3653-61. doi: 10.1364/ao.42.003653.
Differential optical absorption spectroscopy is a widely used technique for open-column atmospheric-gas pollution monitoring. The concentration retrieval is based on the fitting of the measured differential absorbance through the Lambert-Beer law. We present an alternative method for calculating the gas concentration on the basis of the proportionality between differential absorbance and differential absorption cross section of the gas under study. The method can be used on its own for single-component analysis or as a complement to the standard technique in multicomponent cases. The performance of the method for the case of cross interference between two gases is analyzed. The procedure can be used with differential absorption cross sections measured in the laboratory or taken from the literature. In addition, the method provides a criterion to discriminate against different species having absorption features in the same wavelength range.
差分光学吸收光谱法是一种广泛应用于开放柱式大气气体污染监测的技术。浓度反演基于通过朗伯-比尔定律对测量的差分吸光度进行拟合。我们提出了一种基于所研究气体的差分吸光度与差分吸收截面之间的比例关系来计算气体浓度的替代方法。该方法可单独用于单组分分析，也可在多组分情况下作为标准技术的补充。分析了该方法在两种气体交叉干扰情况下的性能。该程序可用于实验室测量的或从文献中获取的差分吸收截面。此外，该方法提供了一种标准，用于区分在相同波长范围内具有吸收特征的不同物种。
