大气消光系数多基线透射式光电测量影响分析  

Impact Analysis of Multi-Baseline Transmission Photoelectric Measurement on Atmospheric Extinction Coefficient

作　　者：曹韩晖 陈洪耀[2,3] 张黎明[2,3] 李佳伟 Cao Hanhui;Chen Hongyao;Zhang Liming;Li Jiawei(University of Science and Technology of China,Hefei 230026,Anhui,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Key Laboratory of Optical Calibration and Characterization,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]中国科学技术大学,安徽合肥230026 [2]中国科学院合肥物质科学研究院,安徽合肥230031 [3]中国科学院通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2024年第12期122-135,共14页Acta Optica Sinica

摘　　要：针对透射式消光系数测量精度不高、难以实现自校准等问题,研究一种基于主动光源的多波段、多基线透射式消光系数测量方法,定量分析光电探测电路信号分辨率、噪声特性、动态范围、随机噪声、响应温度敏感性、数字信号处理、背景辐射等因素对消光系数的影响。结果表明:探测光电流应不小于1.27×10^(-7)A,每次移动距离应不小于1 m,每个测量点时长应不少于40 s,采样率应不小于10 kHz,在目前可实现的基线距离5~20 m范围内,采用谱峰搜索法或取样积分法进行准同步测量,消光系数测量精度受随机噪声影响小于0.8%,这为仪器实现高精度测量研究提供理论基础。Objective The atmospheric extinction coefficient can be measured to obtain essential information,such as particle spectrum distribution and chemical composition of aerosols.It has an important application value in atmospheric environment monitoring,visibility measurement,and outdoor testing of optoelectronic equipment.Solar radiometer is a high-precision atmospheric extinction coefficient measurement device.However,due to its passive measurement,solar radiometer finds it difficult to measure the extinction coefficient in low visibility and during nighttime.Lidar uses an active light source to measure the extinction coefficient,with a long detection distance and an ability to obtain the distribution of atmospheric extinction coefficient profiles.However,based on the principle of backscatter measurement,the extinction-tobackscatter ratio needs to be assumed,and the optimization effect of optical parameters affects its inversion results.Therefore,it is necessary to study the transmission extinction coefficient measurement method based on active light sources.Methods The visibility transmissometer is usually the most typically employed instrument when using active light sources for extinction coefficient measurement.It can be categorized into four types,namely,single end,double end,triple end,and variable baseline.The double-ended transmissometer places the transmitting and receiving devices at both ends of the baseline.However,this requires light source with a high stability and is easily affected by window pollution.The triple-ended transmissometer uses two receiving systems to measure the same radiation source on different atmospheric attenuation paths.Two receiving systems are assumed to have the same pollution and parameters.Therefore,the stability and high-precision measurement of the long-term system cannot be guaranteed.It is often used to expand the measurement range of the instrument.The single-ended transmissometer sets the transmitting and receiving devices at the same end of the baseline,while the other

关 键 词：大气光学 消光系数 变基线透射仪 光电测量 大气透过率 

分 类 号：TH744[机械工程—光学工程]