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关于教室墙壁反射系数(Reflection factor[P])测量方法中墙壁反射光线照度(E_1)测量的问题,在目前出版的大、中专教材中规定:将光电池感光而距墙壁20～30cm处对向该墙壁,即可测得E_1,这是六十年代的力法。在近年的规定中:测量P时选择不受直接光线影响的被测表面(如不宜选择在狭小的窗间距、近窗的侧墙),这对单侧采
Regarding the measurement of wall reflection light illumination (E_1) in the reflection coefficient (P) measurement method of the classroom wall, it is stipulated in the currently published textbooks for secondary and secondary technical schools that the photocell should be exposed to light at a distance of 20-30 cm from the wall The wall, you can measure E_1, this is the force of the sixties. In recent years, the provisions of the following: P measured when the selection of the direct impact of the light from the measured surface (such as should not be selected at a narrow window spacing, near the window of the side wall), which is unilateral mining