研究了目标表面材料双向反射分布函数（BRDF）的测量方法。根据双向反射分布函数参量的空间位置关系分析了测量系统的激光入射角、反射角在三维空间中的变换。采用三轴旋转方式,保持入射光源的位置不变,调整探测器和待测目标的相对位置,配合一定的空间转换关系,实现了将复杂的三维空间位置关系转换到二维平面进行调节。建立了易于调节、搭建的样品平台,并配合斩波器、锁相放大器和数据采集系统等器件建立了目标表面材料双向反射分布函数测量系统。在入射角0°～80°,反射高角0°～80°,反射方位角0°～360°范围内获得了某一型号导弹头待测表面的双向反射分布函数。

The measurement method of the bidirectional reflectance distribution function (BRDF) of the object surface is explored. The changes of the incident angle and the output angle of the laser in the measurement system are studied based on the spatial position relation of the parameters of the BRDF. With the three axes circumrotation method, the position of the incident laser is unchanged, and the conversion from the complicate three-dimensional spatial position relation into a two-dimensional plane is realized, by adjusting the relative positions of the detector and the target with certain spatial conversion relation. A sample platform easy to adjust and build is set up, based on which the BRDF measurement system is completed with the wave chopper, phase lock-in amplifier and data collection system. The BRDF of a certain type missile surface is obtained with the incident angle 0～80°, reflective angle 0～80° and reflective azimuth 0～360°.