介绍了双向反射分布函数的测量原理和方法，搭建了双向反射分布函数的测量装置。该装置可以测量可见光和红外两个波段的双向反射分布函数。在可见光波段采用卤钨灯作为光源，采用光纤光谱仪作为光接收器，以10 nm的波长间隔测量双向反射分布函数。在红外波段采用碳化硅作为红外光源，采用热释电探测器作为光接收器，采用标准板相对定标的方法测量待测样板的双向反射分布函数。可见光波段双向反射分布函数的测量重复性不大于1.5%；3 m～5m 红外波段双向反射分布函数的测量重复性分别小于或等于2.5%、8 m～12 m波段的小于或等于3.0% 。测量结果表明，该测量装置的有效性较高。

The measurement principle and method of the bidirectional reflectance distribution function (BRDF) are presented. A setup for measuring BRDF is built. The setup can be used to measure the BRDF in both the visible band and the infrared band. In the visible band, a tungsten halogen lamp is used as a light source and a fiber optical spectrometer is used as an optical receiver. The BRDF is measured at a wavelength interval of 10 nm. In the infrared band, a silicon carbide material is used as an infrared source and a pyroelectric detector is used as an optical receiver. The BRDF of a sample is measured through indirect calibration of a standard plate. The measurement repeatability of BRDF is less than 1.5 percent in the visible band, equal to or less than 2.5 percent in the range from 3m to 5m and less than or equal to 3.0 percent in the range from 8m to 12m. The experimental result shows that the BRDF measurement setup is highly effective.