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23 January 2003 Dual field-of-view tracking lens system
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Many target-tracking applications require an optical system to acquire the target in a wide field of view and then switch to a narrow field of view for tracking, and identification. This process is complicated by the time required, and the resulting loss of image data during the FOV switch. The objective of the investigation was to develop a dual field of view infrared lens system that could accomplish the FOV switch without the loss of any image data. The design was based on achieving this requirement with the lens system integrated with a range of commercially available mid wave infrared cameras. The results of trade studies and evaluation of user mission profiles, resulted in a system with 100mm and 500mm focal lengths, with a field of view switch within one frame period. The FOV switch was further required to coordinate with the frame synchronization timing to eliminate any loss of data during the FOV change. The requirements also specified a fully integrated system housed in a sealed enclosure that would support extended field deployment in a military environment with no maintenance. Presented herein are details of the design trade studies and specification development, highlights of the resulting optical design with a discussion of the optimization methods employed. Also included are details of the packaging challenges and solutions and sample performance data collected from successful field tests of the first two prototype units.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Geoffrey M. Miller "Dual field-of-view tracking lens system", Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003);


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