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中文摘要：
基于圆盘扩散材料在其盘轴上形成的照度特性,提出一种简单可行的,较为准确的测试材料光反射比的原理和方法,并就7种盘面的亮度和光反射比进行测试和原理、方法的验证.结果表明：将照度计探头置于光场外能有效地避免探头对入射照度的影响,克服了传统方法的缺陷;对于不同盘面,在两种不同的条件下进行测试,表面亮度或光反射比具有相当好的一致性,最大相对误差未超过2.1%,说明所提出的测量原理和方法具有相当好的可行性和准确性.
英文摘要：
Based on the illumination characteristic formed by a diffusive material disc along on its axis,a new principle and method was proposed to test the light reflectivity of diffusive material,which is simple and accurate,and is also verified by practical test in a dark room.The results show that the test values of surface brightness or light reflectivity of the same disc material have good consistency for two different cases,the maximum relative error is not more than 2.1% for the 7 sample discs.This study is conducive to develop new device to test light reflectivity,and to guide relevant investigation.
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