Realization of a Continuous-Zoom Infrared Optical Systemwith High Ratio and Large Relative Aperture
Received:April 16, 2018  Revised:May 14, 2018  download
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Author NameAffiliationE-mail
YU Yang Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai yuyang@mail.sitp.ac.cn 
ZHOU Pan-wei Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai  
PAN Zhao-xin Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai  
JIAN Yi Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai  
Abstract:A new continuous zoom structure was described, and a new independent zoom group was added on the classical four-group-mechanical-compensation. And larger zoom ratio was achieved by the way of two zoom groups cascading. This mathematical model was deduced. Then, according to the cooled mid-wave infrared detector, a continuous-zoom infrared optical system with large zoom ratio and large relative aperture was designed. And the problem that it’s hard for a zoom optical system to achieve both large zoom ratio and large relative aperture was solved. This optical system can zoom from 6mm to 330mm, which means it can reach 55x zoom ratio while the F number is 2 constantly. The working waveband was 3.7-4.8um, the cold shield efficiency was 100%.It contains only eight lenses, three of them move in order to change the focal length. The result shows that the zoom curves are quite smooth and the image quality is quite good in the whole zoom range. The laboratory test and the out-door imaging experiment shows that the image quality is quite good in the whole zoom range. It proves the application effect of this new kind of zoom model, and shows that the system reaches its design goal.
keywords:: large  zoom ratio, large  relative aperture, continuous  zoom, infrared  optical system
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Copyright:《Journal of Infrared And Millimeter Waves》