目的是了解微穿孔板在随机入射场或混响场内的吸声特性与垂直入射的关系。
The purpose is to compare and to find the relation of normal and random incidence.
相对该方法的随机误差10（-5），无论线偏振器位于反射光路或入射光路中，由它产生的折射率测量误差均可忽略不计。
Compared to the measurement random error (rms ) of the order of 10(-5), the total systematic error caused by the errors mentioned above can be neglect.
随机粗糙下垫面对入射到地表的太阳辐射的漫反射必然引起天空亮度的增加。
The solar radiance diffused by a randomly-rough underlying surface might lead to increase sky radiance.
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