本文论述了用调制传递函数面积值(简称MTFA)评价望远系统象质的适用性;着重探讨了MTFA的简化方法,提出采用线性回归法选取特征额率;并对8×30望远系统的MTF实测曲线进行了回归统计,认为特征频率可在极限频率之半的一个颇大范围内选取.文中还提出了对其它测试参数:波长、视场、方位和视度等的简化规定.

The feasibility of MTFA (modulation transfer function area) for assessing imaging quality of visual telescopic systems is described. A method for simplifying the MTFA has been discussed briefly. The way for characteristics frequency selection by using linear regression analysis is presented. Through the MTF measurements of several 8 ? 30 telescopic systems the regression statistics have been obtained from the measured curves. We found that the characteristics spatial frequency may be chosen in a wider range. The optimum frequency is close to the half limit frequency. A simplifying scheme for the parameters used in MTF measnremeiit, i.e. wavelength, field angle, azimuth and dioptric, is also presented.