| 專利摘要 | A method for controlling a light source in a night vision system is provided. The method first computes a pulse width T p=2(d-d 1)/c, where c is the light speed, according to parameters of a desired observing distance d and a shortest distance d 1 of the back-scattering light that enters the light sensor, such as a low-light-level camera. According to the definition of duty cycle D, it is determined by D=(1-d 1/d)/(2-d 1/d). According to the parameters of the desired observing distance and the pulse width, control signals are generated by a pulse signal controller to control a pulsed active-light illuminator with proper emitting period and a gated light sensor with proper gated-on period. |