一种光电系统动态调制传递函数测量方法的研究

Dynamic MTF measurement method of electro-optical systems

运动条件下，光电系统在一定积分时间内的成像过程是一个动态过程。因此需要引用动态调制传递函数概念来评价运动对成像质量的影响。通过设计一套动态调制传递函数测试系统，对运动条件下动态调制传递函数的变化规律进行数据处理和理论分析。结果发现高频振动时，随着振幅的增大，对调制传递函数的影响越大，与静态条件相比MTF值下降0．01～0．1；低频振动时，随着振动频率的加强、振幅的增大或积分时间的增长，调制传递函数下降明显，与静态条件相比较MTF值相差0．01～0．5。

Under moving condition, the imaging process of optoelectronic system is a dynamic process in a certain period of the integration time. Therefore it needs to invoke the concept of dynamic modulation transfer function （MTF） to evaluate the impact of motion on the imaging quality. By designing a dynamic MTF testing system, the data processing and theoretical anal- ysis for variation of the dynamic MTF were carried out under the moving conditions. Experi- mental results show that when it is the high frequency vibration, with the increase of the am- plitude, the impact of MTF is stronger and the MTF value of the difference is 0.01;0.1 com- pared with static conditions; when low-frequency vibration, with the reinforcement of vibra- tion frequency as well as the increase of amplitude or integration time, the MTF decreases ob- viously and the MTF value of the difference is 0.01-0.5 compared with static conditions.