基于增加光电子积分时间的磁镜装置研究

Study of the Magnetic Mirror Device to Enhance the Photoelectron's Accumulation Time

阐述了提高微光成像系统低照度探测极限的本质是需保证成像系统对光信号足够的积累时间,从理论上指出降低CCD温度实现低照度探测的局限性和实现技术的复杂性后,提出在光阴极与光电子接收器(屏靶)之间耦合一个磁镜装置(即微通道电子瓶板结构)作为一种新的光电子接收器,即可有效保证图像信号的积分时间,提高成像系统的探测信噪比,达到拓展微光成像系统低照度探测极限的目的。论证了磁镜场的物理机理,并用计算机模拟显示出了预期的结果。该方案在常温下能实现当前微光成像系统低温探测灵敏度极限10-11lx的目标。

The essential factors of enhancing the detecting limitation of low-light imaging system are enough accumulation time to the light signal. After the principle is demonstrated for the accumulation time of CCD to low temperature, it shows the localization and complexity. So, we put forward a device for promoting the low-light level imaging system＇ detection limit in which a magnetic mirror structure is coupled between the photocathode and the photoelectron acceptor （screen target）, viz. this is the method of microchannel electron vase plate. It can be used in the small-scale integration imaging system respectively to enhance the detection limit of low-light level by the new way. The new photoelectron acceptor can assure the image signal＇s accumulation time. By this new way, the signalto-noise of imaging system can be improved and detection limit of low-light imaging system is expanded. The physics principle of the field of magnetic mirror is demonstrated and the simulation values showed the expected result sensitive detection limit 10^-11 lx can be realized at the room temperature instead low temperature.