基于三波段光学成像系统的地物辐亮度系数测量  

Measurement of Radiance Factor of Ground Target Using Triple-Band Optical Imaging System

作　　者：郭帮辉[1,2] 黄剑波[1] 刘建卓[1] 王健[1] 孙强[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学学报》2014年第6期118-122,共5页Acta Optica Sinica

基　　金：吉林省科技厅发展计划项目(20125092);中国科学院院地合作项目(2011CJT0004)

摘　　要：为了对地面目标的辐亮度系数进行测量,研制了一套包含紫外、可见光和近红外三个波段的光学成像系统,用积分球对其辐亮度响应进行标定,得到辐亮度与图像灰度值和探测器积分时间的拟合方程。提出了一种地面目标辐亮度系数测量方法,采用两块不同辐亮度系数的漫反射板作为参照物,建立辐亮度方程组,最终求解得到的目标辐亮度系数表达式中将不含气象参数项。利用研制的三波段光学成像系统,对绿草地的辐亮度系数进行测量,使用辐亮度系数分别为0.99、0.50、0.20、0.10的四块漫反射板,测得草地的紫外、可见光和近红外波段的辐亮度系数分别为0.070、0.184和0.429。In order to measure radiance factor of ground targets, a triple-band optical imaging system which contains bands of ultraviolet, visible and near infrared is developed. Radiance response characteristic of the triple-band optical imaging system is calibrated using an integrating sphere. The fitted equations between radiance and gray level of image, and between radiance and integration time of detector are got. A method of measurement of radiance factor of ground targets using two diffuser plates with different radiance factors as references to estoblish radiance equations is put forward, by which there would not be any atmospheric parameter in the expression of radiance factor of ground targets. An outdoor measurement of radiance factor of green grass using the triple-band optical imaging system is made. During the measurement, four diffuser plates with the radiance factors of 0.99, 0.50, 0.20 and 0. 10 are used. From the measurement, the radiance factors of green grass in the bands of ultraviolet, visible and near infrared are got, which are 0.07, 0. 184 and 0. 429 respectively.

关 键 词：成像系统 辐亮度系数 三波段 紫外波段 近红外波段 辐亮度标定 漫反射板 

分 类 号：TN23[电子电信—物理电子学] O439[机械工程—光学工程]