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26 November 2012 Design of cooled athermalized infrared telephoto lens
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With the development of the technology of infrared, infrared optical system has been widely used in many fields, especially in tank target detection and recognition. The difficulty and key in the designing of LWIR optical systems for working under temperature range of -60°C~80°C is athermalization. In this paper, the infrared telephoto lens is designed which is composed of four pieces of lenses. The working temperature range is -60°C~80°C. In order to balance the chromatic aberration and thermal aberration, two aspherical surfaces are used in this cooled athermalized infrared optical system. The effective focal length is 100mm and the F-number is 2.The full field of view is 7.0°. The curve of MTF is close to diffractionlimit curve. Within the working temperature, the value of MTF at 17cy/mm is always large than 0.4. The result shows that the infrared optical system achieved better athermal performances at the working temperature range.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yu Zhang, Ji-Yang Shang, Yue Xu, and Wen-Sheng Wang "Design of cooled athermalized infrared telephoto lens", Proc. SPIE 8557, Optical Design and Testing V, 855716 (26 November 2012);

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