Design of solar blind ultraviolet refractive/diffractive zoom lens used in criminal investigation
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1.
Photoelectric Engineering College, Changchun University of Science and Technology, Changchun 130022, China;
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2.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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Corresponding author:
WANG Wensheng, wwsciom@163.com
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Received Date:
2014-05-13
Accepted Date:
2014-05-16
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Abstract
In order to search at long distance and take photos at short distance in criminal investigation, a mechanical-compensation solar blind ultraviolet zoom lens system was designed with binary diffractive elements and aspherical elements. Its zooming region was 40mm~80mm with F number of 4, operating at 0.24μm~ 0.28μm wavelength. The 2.54cm S8844-0909 ultraviolet CCD was selected as a sensor with pixel size of 24μm×24μm and corresponding field of view of 6°~12°. The optical system was composed of seven lenses with simple structure and small size. The results show that in full zooming range, MTF over all fields of view is above 0.7 at back focus length of 10mm and cut off frequency of 21cycles/mm, close to the diffraction-limited curve. The distortion is less than 5%. The zoom lens system has good image quality and stable image plane, and meets the overall design requirements of the optical system.
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