单帘正交组合式焦平面快门的设计与性能测试  

Design of focal plane-curtain shutter and its performance test

作　　者：张洪文[1,2] 冷雪[2] 张继超[2] 丁亚林[2] 曹国华[1] 

机构地区：[1]长春理工大学,吉林长春130025 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学精密工程》2011年第3期587-592,共6页Optics and Precision Engineering

基　　金：国家高技术研究发展计划资助项目(No.2006AA06A208);中国科学院知识创新领域前沿项目(No.070Y32R070)

摘　　要：针对焦面空间尺寸小，两个CCD成像面由于棱镜拼接而成正交垂直分布的航空相机设计了一种焦面帘幕式快门。该快门采用齿形带作为快门帘幕，齿形带上开合适宽度的长条形孔作为曝光帘缝，通过改变帘缝运动速度调整曝光时间。采用两个快门帘幕正交布置、同步驱动的方法实现了两片面阵CCD同时曝光。通过编码器反馈，控制快门驱动电机转速，使CCD曝光时快门帘保持稳速，从而保证CCD曝光均匀性。实际测试显示，快门曝光可实现1／300～1／1000S连续可调，CCD曝光均匀性优于10％。另外，通过更换快门帘，改变曝光帘缝宽度，可进一步拓宽曝光时间调节范围。实验结果表明，此种快门能够满足面阵CCD航卒相机的成像要求。A type of focal plane-curtain shutter was designed for a small focal plane aerial camera whose CCD image was orthogonal and vetical distribution due to the prism splicing. By taking the cog belt as the shutter curtains and the appropriate strip-shaped slit on the curtain as exposure slit, the exposure time of the shutter was determined by the velocity of the shutter curtains. The simultaneous exposure of two pieces of CCDs was implemented by the orthogonal layout and synchrodriving of two shutter curtains. According to the feedback of an encoder, the velocity of shutter motor was controlled by a DSP. Therefore, the shutter curtain ran at a steady speed and offered the exposure uniformity of CCD. Experiment results demonstrate that the shutter has a higher movement stability and a long life span in the range of continuous stepless adjustment exposure time （1/300-1/1 000 s）, and its exposure error is less than 10%. Furthermore,by changing the shutter curtain and the slit width, the exposure time range can be extended. Obtained result shows that the performance of this shutter fully satisfies the requirements of area CCD aerial cameras.

关 键 词：航空相机 焦面帘幕式快门 曝光均匀性 曝光时间 

分 类 号：V475.3[航空宇航科学与技术—飞行器设计]