Optics and Precision Engineering, Volume. 16, Issue 9, 1629(2008)
Study of TDI pattern for interline transfer progressive scan CCD
In space environment,the micro-lens of interline transfer progressive scan Charge Coupled Device(CCD) will become fuzzy,for the effect of space ray in a long time results in bad quality image of the space camera.However,an interline transfer area CCD without the micro-lens has a lower fill factor and quantum efficiency,it will result in bad quality and lower ratio of Signal to Noise(SN) of image also.In order to apply this kind of CCD in space camera,a Time Delay Integral(TDI) pattern to overcome the conflict based on the character of the CCD was proposed,a system using Field Programming Gate Array(FPGA)to generate the driving signal was designed to realize the TDI pattern.At the same time,the communication and data transfer of FPGA with computer was completed by RS485 bus for setting the TDI stage,the integral time of TDI and the gain and offset parameters of video process chip.The experimental results indicate that the SN ratio is only 22.13 dB(the TDI stage is one) and the quality of the image is very bad when imaging without a micro-lens.After setting a reasonable TDI stage parameter,the SN ratio of the image is 33.62 dB(TDI stage is four),the quality of the image has a big improvement.Experiments show that the TDI pattern of interline transfer progressive scan CCD can improve the quality of image without micro-lens under space ray environment,Which resolves the conflict of micro-lens can improve the quantum efficiency of interline transfer progressive scan CCD,but micro-lens will become fuzzy for the effect of space ray in a long time.
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ZHOU Huai-de, LIU Hai-ying, XU Dong, LI Guang-ze, WANG Ye, LIU Jin-guo. Study of TDI pattern for interline transfer progressive scan CCD[J]. Optics and Precision Engineering, 2008, 16(9): 1629
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Received: Mar. 26, 2008
Accepted: --
Published Online: Feb. 28, 2010
The Author Email: Huai-de ZHOU (gjszhd@sohu.com)
CSTR:32186.14.