胶片型航空画幅遥感相机中负压展平机构的设计

航拍成像胶片的展平精度是影响相机分辨率的主要因素.长焦距、大画幅、高分辨率的胶片式画幅遥感相机要求在给定的摄影周期内快速、精密地将胶片展平在片台上.为实现画幅尺寸为114 mm×114 mm的胶片展平精度达到0.034 mm,吸附时间为420 ms,提出了一个较完善的胶片展平机构,介绍了利用负压将胶片展平在焦平面板上的方法.阐述了该展平机构的组成和工作原理,给出了片台的结构形式,并通过分析计算得出关键器件的选择依据.提供了一种利用光学技术来定性检测展平精度的方法.经成像试验验证,该方法可满足使用要求.

Design for negative pressure flatten system in aerial frame film camera

Flatten precision is one of the important factors effecting on camera's resolution. It is required that the film in a aerial camera with long focus, wide frame and high resolution should be flattened on film board quickly and precisely during exposure time. Aiming at the film size of 114 mm × 114 mm, flatten precision of 0.034 mm and absorption time of 420 ms,this paper introduces a perfect film flatten system, and provides a method for flattening the film on the film board using negative pressure. The constitution and operating principle of this system are introduced, the structural style of film board is clarified and the choice basis of key devices are obtained by analyzing and computing.The results show that the proposed method is a excellent optical method used to analyze flatten precision,which can meet the demand for aerial frame film camera.