蓝紫波段腔增强型光声光谱高灵敏度、高精度测量气溶胶光吸收特性的方法研究

项目名称： 蓝紫波段腔增强型光声光谱高灵敏度、高精度测量气溶胶光吸收特性的方法研究

项目编号： No.21307136

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 环境科学、安全科学

项目作者： 易红明

作者单位： 中国科学院合肥物质科学研究院

项目金额： 25万元

中文摘要： 气溶胶是大气中比较重要的微量物质成分，在影响地球辐射能量平衡、气候变化和大气环境化学中起着重要的作用。气溶胶对气候、环境的作用程度强烈依赖于气溶胶的光吸收特性，然而，由于缺乏合适的技术方法，目前对气溶胶光吸收特性的测量灵敏度不够高且偏差较大，尤其在蓝紫波段受到大气分子NO2吸收的干扰。 光声光谱是一种直接测量吸收的方法，不受光散射等因素的影响，很适合气溶胶光吸收的测量。为此，本申请拟通过开展基于腔增强型光声光谱实现蓝紫波段高灵敏度、高精度测量气溶胶光吸收的方法研究，解决光声光谱测量蓝紫波段气溶胶光吸收时测量灵敏度、准确度不高、受NO2分子吸收干扰等问题。为研究蓝紫波段气溶胶的光吸收特性对气候、环境的影响提供准确、科学的测量手段。

中文关键词： 光声光谱；气溶胶；吸收测量；激光二极管；

英文摘要： Aerosol is one of important trace species constituent in the atmosphere, which have a significant effect on the Earth's radiation balance, local or global climate and environmental chemistry. The magnitude of aerosol effects on climate or environmental chemistry strongly depends on the characteristics of light absorption by aerosols. However, currently, aerosol light absorption measurements still show lacking of high sensitivity, large uncertainties, mainly because of the lack of appropriate detection methodology. The photoacoustic (PA) technique is a direct method to measure light absorption, which is very suitable for measuring light absorption as it is free from the influence of light scatter. As a result, the present proposal is to carry out the research for high sensitivity, accuracy measurement of aerosol light absorption with photoacoustic spectroscopy. The purpose of the proposal is to solve the problems that current aerosol light absorption measurements still show large uncertainties，without enough high sensitivity. As a result, our proposal will committed to improve the accuracy of aerosol light absorption measurements and offer a new method for investigation the infulence of aerosol on climate and environmental chemistry.

英文关键词： Photoacoustic spectroscopy；Aerosol；Absorption measurement；Laser diode；