10 October 2003 Optics for long-range camera modules with QWIP 640x480 detectors
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In airborne applications there is a need for compact long range camera modules to be fitted into gyro-stabilized gimbals. The QWIP 640x480 detector operating in LWIR gives, with its high spatial and thermal resolution, a good performance. For the optics, long range means narrow field of view and long focal length. The challenge is to combine the narrow field of view with two wider fields of view for surveillance and still make it compact. The solution is to fold the optics. This normally gives optics with mounting difficulties, but by keeping the position requirement of each lens element low, the assembly is simplified. Design efforts combined with improved production techniques creates a solution based on diamond turned mirrors, lenses and diffractive elements. Narcissus effects are dealt with by means of customized AR coatings.
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Stefan A.I. Johansson, Stefan A.I. Johansson, } "Optics for long-range camera modules with QWIP 640x480 detectors", Proc. SPIE 5074, Infrared Technology and Applications XXIX, (10 October 2003); doi: 10.1117/12.498679; https://doi.org/10.1117/12.498679


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