As the intensity of light varies - by the breaking of a light beam, say, or a decrease in general illumination - the amount of current generated by the sensor changes.
光线强度的变化(如光束被遮断或是一般照明的降低)会造成侦测器里产生的电流随著改变。
2
This method USES at least two light sensor measurements to derive information concerning both the ambient light levels and the illumination source output level for known drive conditions.