透射式能见度仪动态范围扩展方法  

Method to extend dynamic range of transmittance meter

作　　者：肖韶荣[1] 吴群勇[2] 周佳[2] 徐猛[2] 尚国庆[2] 

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

出　　处：《应用光学》2014年第4期574-579,共6页Journal of Applied Optics

基　　金：科技部公益性(气象)行业专项(GYHY201203067);江苏省科技支撑计划(BE2010733)

摘　　要：提出了一种利用光学衰减片与电机组合,扩展透射式能见度仪动态范围的方法。通过改变加载到LED光源的调制信号的幅度,控制LED光源的发射光强;设计测量系统,选择固定透过率的衰减片;设置合理的系统阈值完成数据测量。对测量数据作拟合分析,结果表明:采用透过率为60%的中性密度衰减片,系统动态范围扩展了0.6倍;透过率为12%时,系统动态范围扩展了6.9倍。同时,通过选择不同透过率的中性密度衰减片,可实现系统动态范围的灵活扩展。A method to extend the dynamic range of transmittance meter with a combination of optical attenuator and motor was introduced .In this system ,the emission intensity of the LED was controlled by the variation amplitude of modulation signal which was loaded .Further-more ,we selected fixed transmittance attenuator and established the reasonable threshold when the data measurement was carried on .According to fitting analysis of data ,the result shows that the system's dynamic range is extended 0 .6 times ,when using neutral density at-tenuator whose transmittance is 40% .And it is extended 6 .3 times when the transmittance is 87% .Meanwhile , by choosing neutral density attenuator of different transmittance , the system's dynamic range can be flexibly extended .

关 键 词：光电探测 能见度 动态范围 衰减片 电机 

分 类 号：P415.33[天文地球—大气科学及气象学]