Solar-blind region of UV wave waveband, which is from 240nm to 280nm, is absorbed by atmosphere seriously.
This feature can ensure solar-blind ultraviolet(UV) optical system is not affected by natural and artificial light sources. In
this paper, an optical system based in the solar-blind spectrum region is designed to realize UV missile warning.
System structure is simplified and image quality is improved by using aspheric surfaces and binary optical elements.
In order to increase the detection range, the field of view is increased to 50°. The focal length of system is 30mm and UV
CCD PIXIS 2048BUV is selected as the detector with effective imaging area 27.6mm×27.6mm and pixel size
13.5μm×13.5μm. From the diagram of diffraction encircled energy, more than 85% of the light energy for each field of
view is received within a pixel size. The spot diagram for each field of view is smaller than a single pixel size. The image
quality of the system has characteristics of high energy concentration and uniform illumination on image plane. This
system is suitable for both military and civil applications.
Based on the requirements of corona detection on searching targets with large field of view and detecting objects
with small field of view, a refractive zoom optical system using mechanical compensation technology, which operates at
0.24μm~0.28μm wavelength ,is designed with aspherical surfaces. S8844-0909 ultraviolet CCD is selected as a sensor
with pixel size 24μm×24μm. The zooming region is 35mm~70mm with F number of 3.5 and the corresponding field of
view of 7°~14°.The zoom lens consists of seven lenses with two aspherical surfaces, so it has the advantages of
compact size and simple structure. The results show that in full zooming range, the MTF values over all fields of view
are above 0.8 at cut-off frequency 21lp/mm. The distortion is less than 5%.The zoom lens system has good image
quality and stable image plane, which meets the overall design requirements of the optical system.
Keywords: Corona detection, Zoom lens, Aspheric surface
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