A 15× double-group linkage zoom lens was presented based on the 640×512 cooled FPA. Having two alternate components linked and moved together, double-group zoom structure has smoother cam curve, so the displacement of all components are smaller and the total length is shorter. The focal length rang is 30~450mm and wavelength is 3.7~4.8μm, F number is 4. This lens was placed at cold shield and 100% cold shield efficiency had reached. Moreover, detailed design and image quality were given by CODE V® optical software. After analysis, MTF approaches diffraction limit. The results show that this optical system has large zoom ratio, and excellent image quality.
Based on a 384×288 uncooled long-wavelength IR detector, a dual-FOV zooming optical system has been designed. To match the requirement of lightweight and flexible optoelectronic system, the zoom lens has been designed demountable. To evaluate the image quality, the MTF and RMS have been mainly considered. Also, the temperature analysis has been done to get the focusing solution. The result showed that the image quality was well and matched the requirement well.
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