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25 November 2009 Design of a continual zoom system with high speed for hyperspectral imagers
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Abstract
A continual zoom system with high speed and visible wavelength range is designed. The lens has the advantages of high etendue and telecentricity in image space. It can be used properly as the fore objective of imaging spectrometers with high resolution since its image size doesn't change with the defocus of detector plane and its illumination in the plane is rather uniform. According to the characteristics and performance of the optical system of our hyperspectral imager, the structural selection and the initial parameter calculation are introduced in detail. The designed optical system with mechanical compensation is presented. The zoom ratio of the lens is 4 and the relative aperture 1:2. Its effective focal length is 55mm at short focus end and 220mm at long focus end. Its field angle is from 2 degrees to 8 degrees. Its distortion is lower than 0.6 per cent. The MTF value at the spatial frequency of 35lp/mm is higher than 0.77. The evaluation of its image quality shows that the designed zoom system can meet the requirements of our hyperspectral imager as its fore objective.
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Qiang Lu, Yiqun Ji, and Weimin Shen "Design of a continual zoom system with high speed for hyperspectral imagers", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060B (25 November 2009); https://doi.org/10.1117/12.838166
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