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：介绍了一种真空紫外反射率计，采用间接测量方法，在该反射率计测试了聚四氟乙烯漫反射板的双向反射率分布函数（ＢＲＤＦ），正入射时该聚四氟乙烯漫反射板１５°到７５°的双向反射率分布函数偏差为１３％。
: A vacuum ultraviolet reflectometer was introduced. The indirect measurement method was used to measure the bi-directional reflectance distribution function (BRDF) of the polytetrafluoroethylene diffuse reflectors. In the case of normal incidence, the polytetrafluoroethylene diffuse reflectance The bi-directional reflectance distribution function deviation of the plate from 15 ° to 75 ° is 13%.