激光与光电子学进展, 2020, 57 (23): 233004, 网络出版: 2020-12-07
苯、甲苯和二甲苯紫外差分吸收光谱解析模拟 
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Analytical Simulation of Ultraviolet Differential Absorption Spectra of Benzene, Toluene, and Xylenes
光谱学 差分吸收光谱法 颗粒物影响 入射光强影响 数值模拟 spectroscopy differential optical absorption spectroscopy particle effect incident light intensity effect numerical simulation
摘要
差分吸收光谱法(DOAS)是利用气体分子窄带吸收特征来测量气体浓度的一种光谱测量技术。本文介绍了DOAS的基本原理,利用MATLAB开发了一套苯、甲苯和二甲苯(BTX)DOAS数据处理程序,并将BTX浓度假设值与反演值进行对比分析,同时研究了入射光强变化和颗粒物参数对浓度反演的影响。结果表明:BTX浓度反演值与假设值具有良好的一致性,说明BTX-DOAS数据处理程序是正确的;通过数值模拟验证了DOAS中理论上无法直接推导的前提条件的正确性。
Abstract
Differential optical absorption spectroscopy (DOAS) is a spectroscopic measurement technique that uses the narrow-band absorption characteristics of gas molecules to derive gas concentrations. This paper introduces the basic principles of DOAS, and develops a program in MATLAB to analyze DOAS data for benzene, toluene and xylenes (BTX). Moreover, the hypothetical and retrieved values of BTX concentration are compared, and the effects of the change in the incident light intensity and particle parameters on concentration retrieval are studied. Results show that the retrieved values are consistent with the hypothetical values of the BTX concentration, indicating the accuracy of the BTX-DOAS data processing program. Preconditions that cannot be directly deduced theoretically in DOAS are validated using a numerical simulation.
王祥如, 蔡小舒, 陈军, 周骛. 苯、甲苯和二甲苯紫外差分吸收光谱解析模拟[J]. 激光与光电子学进展, 2020, 57(23): 233004. Xiangru Wang, Xiaoshu Cai, Jun Chen, Wu Zhou. Analytical Simulation of Ultraviolet Differential Absorption Spectra of Benzene, Toluene, and Xylenes[J]. Laser & Optoelectronics Progress, 2020, 57(23): 233004.
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