Atmospheric Aerosol Particles In The Optical Absorption Coefficient Measurement System Developed

Subject:opticsTitle: The study of mearsurement system of light absorptioncoefficient of aerosol particles in atmosphereTutor:Wang junbo professorYang xiaoli vice professorAuthor: Luo jiuqiangThe presence of atmospheric aerosol particles directly affects the propagation of light in atmosphere, causing light degradation.The absorption of aerosols is a main factor which affect laser beam propagation in air.The aerosols absorption has much effect on both climate and environment.So it is very meanful in reality to measure the coefficient of light absorption by aerosol particles.We made specialy the light absorption coefficient measurment system in order to satisfy the study of high power laser propagation in atmosphere.We made the light absorption coefficient measurement system with Nuclepore filter which were used to collected aerosol particles. The system has one laser beam which is split into two laser beam, one being information light which transfer through glass pipe, the other being reference light which transfer directly through atmosphere. so the measurement system could well eliminate the effect of all kinds of measurement errors which were caused by optical ullage and circuit noises and power fluction. The system also could decrease the effect of scattering light on absorption coefficient measurement by partly plating highly reflective membrane, so that we can improve the precision of the system.The detail works of the system triture include the designing and making of the optical pipe and components, the designing and manufacturing of the amplifying circuit, the making of AID converting and sampling program, the programming of data process procedure.