Folded path LWIR system for SWAP constrained platforms

Erin F. Fleet; Michael L. Wilson; Dale Linne von Berg; Thomas Giallorenzi; Barry Mathieu

doi:10.1117/12.2050503

24 June 2014 Folded path LWIR system for SWAP constrained platforms

Erin F. Fleet, Michael L. Wilson, Dale Linne von Berg, Thomas Giallorenzi, Barry Mathieu

Proceedings Volume 9070, Infrared Technology and Applications XL; 907029 (2014) https://doi.org/10.1117/12.2050503
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

Folded path reflection and catadioptric optics are of growing interest, especially in the long wave infrared (LWIR), due to continuing demands for reductions in imaging system size, weight and power (SWAP). We present the optical design and laboratory data for a 50 mm focal length low f/# folded-path compact LWIR imaging system. The optical design uses 4 concentric aspheric mirrors, each of which is described by annular aspheric functions well suited to the folded path design space. The 4 mirrors are diamond turned onto two thin air-spaced aluminum plates which can be manually focused onto the uncooled LWIR microbolometer array detector. Stray light analysis will be presented to show how specialized internal baffling can be used to reduce stray light propagation through the folded path optical train. The system achieves near diffraction limited performance across the FOV with a 15 mm long optical train and a 5 mm back focal distance. The completed system is small enough to reside within a 3 inch diameter ball gimbal.

Citation Download Citation

Erin F. Fleet, Michael L. Wilson, Dale Linne von Berg, Thomas Giallorenzi, and Barry Mathieu "Folded path LWIR system for SWAP constrained platforms", Proc. SPIE 9070, Infrared Technology and Applications XL, 907029 (24 June 2014); https://doi.org/10.1117/12.2050503

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KEYWORDS

Mirrors

Sensors

Modulation transfer functions

Long wavelength infrared

Cameras

Geometrical optics

Imaging systems

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