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本文概述将MTFA用于评价目视仪器象质的适用性,着重讨论采用线性回归统计法选取特征频率,以简化MTFA评价指标。实测统计北京光学仪器厂的十九具TDJ_2产品的结果表明,对该产品可供评价用的特征频率范围宽、精度高。本文还对测试小视场望远系统MTF的其它参量作了简化规定,为工厂建议一种便于快速定量而可靠的生产检验规范。文中主要方法,也适用于其它望远系统。
This article summarizes the applicability of MTFA for evaluating the visual quality of visual instruments, and focuses on the use of linear regression statistical method to select the characteristic frequency to simplify the MTFA evaluation index. The measured data of Beijing Optical Instrument Factory’s 19 TDJ_2 products show that the product has a wide range of characteristic frequency for evaluation and high precision. This article also simplifies the testing of other parameters of the MTF for small field of view telescopes, suggesting a reliable manufacturing inspection specification for the factory that is fast and quantitative. The main method in this article also applies to other telescopic systems.