A design on a control method of a new type of focal plane shutter
In order to ensure appropriate exposure time, and no exposure while electric charge is transferring after taking a photograph, it is necessary to have the shutter mechanism cooperate with CCD for area CCD aerial cameras. The ground object illumination has a wide range which is from 4000Lx to 100000Lx, so a shutter which is high efficient and a continuous stepless adjustment are also required. This paper introduces the fundamental principle, structural design and control procedure about this new focal plane shutter. Under the control of DSP, the velocity of shutter curtain governed by the shutter motor can be not only precisely controlled, but also the durability and the reliability are increased. The experiment results have shown that this new shutter has the higher stability of movement, long life span with more than 105 operating times, a wide range of exposure time froml/ 50s to 1/ 320s(depending on the slit width)and the exposure error is less than 10％. With the CCD gain adjustment, the performance of this shutter is fully satisfied with the requirements of area CCD aerial cameras.
Focal plane shutter Exposure time Incremental encoder Exposure uniformity Lead-lag control
Leng Xue Liu Ming Zheng Li-na Zhou Jiu-fei Zhang Hong-wen Zhang Ji-chao
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences Changchun, China
国际会议
长春
英文
293-296
2010-08-24（万方平台首次上网日期，不代表论文的发表时间）