【摘要】 以智能手机屏幕为测量对象探究了平板光源的光照强度与色彩和距离的关系。首先验证了点光源光照强度与光源至被照物体表面的距离的平方成反比,平行光光照强度与至被照物体的距离无关。平板光源的发光强度随测量点与光源距离的增加而减小,并呈指数衰减关系,与朗伯比尔定律类似。平板光源的发光强度随光源色彩的改变而不同,屏幕亮度越高,光强衰减越快。平板光源发出的白光在空气中的穿透深度约为13.5 cm。由于光照强度随距离的指数衰减关系,可知平板显示器件的光强都是经过大幅衰减之后才到达人眼的,这对人眼具有一定的保护作用。更多还原

【Abstract】 Employing the screen of an intelligent cellphone as the light source,the illumination properties such as the relationship between the illumination intensity and the light source distance or color are studied.First of all,we verified the inverse square law of the decay of the illumination intensity for a point light source with respect to the distance between the light source and the detector,while for the light source emitting parallel light rays,the illumination intensity is almost independent of the distance.For the flat panel light source,its illumination intensity decays exponentially with respect to the distance,and also vary under different screen color.With the higher relative screen brightness,the illumination intensity decays faster with respect to the distance. As a result of the exponential decay behavior of the illumination intensity,it is known that the light emitted by the flat panel display is greatly weakened after traveling the distance between the light source and the human eyes,which is protective to the eyes.更多还原