一种改善直耦增强数码相机静态成像时间响应特性的方法

Improvement of Time Response Characteristics of Direct Coupling-enhanced Digital Camera Static Imaging

理论上分析了CIDC1816型直耦增强数码相机在采集静态图像过程中像增强器阴极电压衰减时间对电子光学系统横向位移的影响．实验证明了阴极电压衰减时间会对荧光屏亮度衰减时间产生影响．提出了利用电子开关的高速响应特性来减小阴极电压衰减时间，以改善该类型相机时间响应特性的方法．研究表明，当外界光照条件大于10。lX时，阴极电压衰减时间由80～130ms减小到50～60ns，电子光学系统的横向位移受阴极电压衰减特性的影响减小，荧光屏亮度衰减时间由12～26ms减小到了3～4ms．研究结果证明了该方法能够有效地减小像增强器阴极电压衰减时间和荧光屏亮度衰减时间，为提高该类型相机静态成像质量提供参考．

When CIDC1816 direct coupling-enhanced digital camera was collecting still images, the effects of image intensifier cathode voltage decay time on the electron-optical systems were analyzed in theory, and it was proved that cathode voltage decay time also had impact on screen brightness decay time. A method was proposed using the high-speed response characteristics of electronic switches to reduce cathode voltage decay time and improve this kind of digital camera time response characteristics. Using this method during the period of collecting still images, the results show that image intensifier cathode voltage decay time was reduced from 80 ~ 130 ms to 50 ~ 60 ns, the impact on the electron-optical systems by cathode voltage decay time was reduced, and the screen brightness decay time was reduced from 12~26 ms to 3~ 4 ms, when the outside light conditions was greater than 10.4 lx. The results prove that this method can effectively reduce the image intensifier cathode voltage decay time and screen brightness decay time and be used as reference scheme for improving this kind of camera still-picture quality.