散射能见度仪接收器视场角对测量的影响  

The Effect of Field Angle of For ward Scattering Visibility Receiver on Measurement

作　　者：肖韶荣[1] 黄新[2] 张周财 钱昊[2] 杨丽[2] 

机构地区：[1]南京信息工程大学物理与光电工程学院,南京210044 [2]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《现代雷达》2015年第1期78-82,共5页Modern Radar

基　　金：科技部公益性(气象)行业专项基金资助项目(GYHY201106047);江苏省科技支撑计划基金资助项目(BE2010733)

摘　　要：散射式能见度仪一般通过透镜限制接收器的视场角,接收光束成张角较大的锥形,测量角度具有不确定性,不符合严格的角散射系数定义。文中提出了使用透镜和阶跃光纤组合方式限制接收器视场角,接收光束为测量角度的入射平行光束,符合严格的角散射系数定义。使用TDA-4B气溶胶发生器产生6种浓度的气溶胶粒子,粒子直径不随浓度变化,对每一种浓度的粒子同时使用透镜和透镜加光纤组合两种限制接收器视场角的方式进行角散射系数的测量实验。通过实验得出,在单分散系条件下接收器的视场角偏大会导致角散射系数测量结果偏大,而通过Koschmieder定律计算得出能见度值会偏小。The forward scattering visibility meter uses the lens to limit the receiver＇s field angle generally and the received light beam is a cone of large opening angle, so the measured angle has uncertainty which does not comply with the strict definition of an- gle scattering coefficient. Using combinations of lenses and step-index fiber to limit the receiver＇s field angle is proposed in this pa- per, so the received beam is the parallel beam from the measured angle and this complies with the strict definition of angle scatter- ing coefficient. Six different concentrations of submieron-scale aerosol are generated by aerosol generator TDA4B and the diameters of aerosol particles do not change with concentration. The angular scattering coefficient is measured in each concentration by two ways to limit the field angle of the receiver. Eventually, value of angular scattering coefficient is large because of large field angle in single-decentralization and the visibility value is small through Koschmieder law.

关 键 词：能见度 视场角 角散射系数 光电探测 

分 类 号：P415.33[天文地球—大气科学及气象学]