基于多旋翼无人机的BRDF测量系统设计

Design of BRDF measurement system based on multi-rotor UAV

鉴于目前场地双向反射分布函数测量的非便携性和低效性,开展了基于多旋翼无人机的场地双向反射分布函数测量系统的研制。该系统主要由多旋翼无人机和可见-短波红外光谱仪组成,其中光谱仪的观测镜头由高精度无人机云台控制。光谱仪采用两个波段探测单元,整体光谱覆盖范围为400~1700nm,两个探测单元均以平场凹面光栅分光、线阵探测器探测信号,两个探测单元的光谱分辨率分别优于3nm和12nm。为验证基于多旋翼无人机的场地双向反射分布函数测量系统的综合性能,利用该测量系统对敦煌辐射校正场进行了地表方向特性测量。试验结果表明,该便携式测量系统可以大大提高场地双向反射分布函数的测量效率,为场地双向反射分布函数测量的未来发展提供了有益参考。

Considering the non-portability and low efficiency of the measurement of bidirectional reflectance distribution function at present,a measurement system of bidirectional reflectance distribution function based on multi-rotor UAV was developed.The system is mainly composed of multi-rotor UAV and visible-short wave infrared spectrometer,with the observation lens of the spectrometer controlled by a high-precision UAV cradle head.The spectrometer adopts two wave band detection units,and the overall spectral coverage is 400~1700 nm.The two detection units of the spectrometer detect signals with flat field concave grating and linear array detector,and their spectral resolution is better than 3nm and 12nm respectively.In order to verify the comprehensive performance of the measurement system of bidirectional reflectance distribution function based on multi-rotor UAV,the surface directional characteristics of Dunhuang radiation correction field were measured using the measurement system.The experimental results show that the portable measurement system can greatly improve the measurement efficiency of bidirectional reflectance distribution function and provide a useful reference for the future development of measurement of bidirectional reflectance distribution function.