光热干涉法测量大气气溶胶粒子吸收系数研究进展

Progress on Measurement of Atmospheric Aerosol Particle Absorption with Photo-Thermal Interferometry

光热干涉法可在保持大气气溶胶状态不变的前提下直接测量其吸收系数,具有灵敏度高、响应速度快和测量结果不受散射光影响等优点。详细阐述了光热干涉法测量气溶胶吸收系数的基本原理。通过对几种典型光热干涉仪的剖析,包括Mach-Zehnder干涉仪、Fabry-Perot干涉仪、Jamin干涉仪和折返Jamin干涉仪,介绍了该方法不断完善的研究历程以及仍然待解决的问题。描述了在借鉴和创新基础上,正在开发的全光纤结构光热干涉试验装置。分析了光热干涉法的未来发展趋势。

Photo-thermal interferometry, which is highly sensitive, real-time and free-effected by light scattering, can directly measure the absorption coefficient without changing atmospheric aerosol state. It is firstly elaborated that the basic principles of photo-thermal interferometry for measuring aerosol absorption coefficient. Several typical photo-thermal interferometers are analyzed, including Mach-Zehnder interferometer,Fabry-Perot interferometer, Jamin interferometer and folded Jamin interferometer. Then the research process of this method and corresponding unsolved problems are brought out. On this basis, a fiber structure photo-thermal interferometer test device is developed. Finally, the future trend of this method is concluded.