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Optical design of a broadband (3-12 µm) athermal infrared imager

Optical design of an imager that works in two sub bands of the infrared spectrum which are called midwave and longwave (3-5 and 8-12 μm) is described in this work. The relevant design issue is not affected by the rate of change of temperature in terms of various season and atmosphere conditions in operation. In this study, the first attempt dealt with is to describe the broadband concept and to highlight that term. Then, basic information is presented about infrared subbands. After describing the details of optical design in an infrared band, the decisions on necessary design parameters are made. In this scene, environmental conditions regarded during the design process are chosen as challenging weather conditions in Turkey within the range from -35 to 50°C.