像增强器MTF测量理想像面选择方法研究

为了能够获得准确的调制传递函数测量结果，对测量系统中投射图像的理想成像面进行选择性调节。通过对微光像增强器调制传递函数测量系统光学成像性质的深入分析，讨论了光学系统的像差特性，利用平均中点取值法实现了微光像增强器调制传递函数测量中对理想成像面的选择。通过与微光像增强器已有测量结果的对比，证明所述方法能够保证微光像增强器调制传递函数测量的准确性。

Method of choosing ideal imaging plane in image intensifier MTF measurement

Since MTF measurement is important for evaluating the imaging quality of low-light-level image intensifier, the imaging plane position in the measurement system is adjusted to obtain accurate MTF measurement results. The optical imaging feature of LLL image intensifier MTF measurement system was analyzed, and the aberration of the optical system was discussed. The ideal setting of the imaging plane in LLL image intensifier MTF measurement was implemented by the method of the average middle value. By comparing the result with the known value of the image intensifier, this method is proved to be accurate.