发光二极管LED非相干宽带腔增强吸收光谱技术对大气HONO的定量方法研究

项目名称： 发光二极管LED非相干宽带腔增强吸收光谱技术对大气HONO的定量方法研究

项目编号： No.61275151

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 秦敏

作者单位： 中国科学院合肥物质科学研究院

项目金额： 75万元

中文摘要： HONO作为OH自由基的重要前体物以及对O3和光化学烟雾形成的促进作用而引起广泛关注；关于其来源问题，特别是白天HONO的来源及光化学污染中对HOx基团的贡献以及在整个VOC/NOy/O3大气化学中的角色还存在诸多不确定，各不同大气环境下的数据仍然相当缺乏。 针对我国一次排放污染物和气溶胶浓度高、成分复杂的大气污染特征，结合国际上普遍关注的大气HONO收支的前沿问题，开展发光二极管非相干宽带腔增强吸收光谱（LED-IBBCEAS）技术对大气HONO的定量方法研究，通过研究系统参数对测量灵敏度的影响，确定光谱测量最佳的性能参数，建立应用于IBBCEAS技术的多组分痕量气体浓度反演算法模型，实现对大气HONO及NO2等痕量成分的实时在线高灵敏探测，通过与已有的差分吸收光谱（DOAS）技术进行比对、验证，开展我国不同大气环境下HONO浓度分布特征研究，探究不同大气环境下HONO的来源途径。

中文关键词： 发光二极管（LED）；非相干宽带腔增强吸收光谱（IBBCEAS）；大气；HONO；收支

英文摘要： As a significant photochemical precursor of OH radical, interest in atmospheric HONO arises from the fact that it plays an important role in enhancing the formation of ozone and photochemical smog. However, the exact mechanisms leading to HONO formation are still not completely understood at present, especially not for its daytime source. Such uncertainties are critical in estimating the contribution of HONO to the HOx budget and therefore to the whole VOC/NOy/O3 chemistry involved in photochemical pollution. There is still a considerable lack of information on typical HONO distribution in both urban and rural environments. With high primary pollutants and aerosol concentrations, the photochemical system in China can be expected to be sometimes quite different from the one observed in developed countries. To evaluate the atmospheric HONO budget under the prevaliling air quality conditions in China, an incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) system based on LED light source will be established for atmospheric HONO quantification. To ensure the system optimal performance with high sensitivity for spectroscopic identification, the effects of the system parameters on HONO measurement will be investigated. In order to caculate the concentrations of trace gases, a multi-component con

英文关键词： Light emitting diode(LED)；IBBCEAS；Atmosphere；HONO；Budget