Atmospheric Aerosol Interferometry Experiments Of Field Research

Absorbing of aerosols directly affect the propagation of light in the atmosphere,and resulting attenuation of light intensity; aerosols absorb light energy and makeelectromagnetic energy into heat, reducing the solar radiation on the ground, affectingthe earth’s radiation balance; aerosol absorption contributes to non-heated entry ofclimate model generates heat,which is one of the most uncertain factors in climatemodels. In order to accurately estimate the atmospheric aerosol radiative forcing valuesto improve the sensitivity of the climate change models, conduct research to accuratelymeasure the aerosol absorption coefficient is very urgent and necessary.In this paper, based on the atmospheric aerosol as the research object, studied thebasic principles of laser photothermal interferometry method of aerosol particlesabsorption coefficient, deduced from the thermo-optic effect up to the relationshipbetween refractive index and temperature caused by heat absorption; based on thetraditional folded Jamin interferometer type to improve, designed a simple structure,high precision photothermal interferometry system, and did optical path analysis andmathematical derivation; through SolidWorks mechanical modeling, design the entireinterferometer measurement system and do finite element analysis for aerosolabsorption cell, which provide a reference for selection of experimental apparatus;finally choose C#as the development language, designed interface of interferometryexperiments, the collection of underlying data and analysis procedures, which achievethe entire solar thermal interferometry experiments from hardware to softwareinterconnection and get better experimental data.Thesis studies and analyzes of the relationship between changes in the refractiveindex with temperature between; example of the solid model is completed by this papershow that the photothermal interferometry system has a simple structure, highsensitivity measurements; through multiplication optimized design to further improvethe detection sensitivity and range of the interferometer system, reduce the power ofpump laser excitation; The refractive index can be detected with a resolution of3.51*10-7.