Compact dual field of view SWIR/MWIR optical system

Jay N. Vizgaitis; Kyle Witte; Roy Littleton; Philip Perconti

doi:10.1117/12.888097

20 May 2011 Compact dual field of view SWIR/MWIR optical system

Jay N. Vizgaitis, Kyle Witte, Roy Littleton, Philip Perconti

Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 801225 (2011) https://doi.org/10.1117/12.888097
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

This paper discusses the design and development of a dual field of view, all-refractive infrared optical system that images the mid-wave infrared (MWIR) light in one field of view and the short wave infrared (SWIR) light in the narrower second field of view onto the same detector. The narrow field of view images the SWIR radiation at a slow f/number of 10.0, while the wide field of view images the MWIR radiation at f/1.9. The field of view is changed via a single lens that changes its axial position within the lens, resulting in an axial zoom and an overall magnification change of 6X. The change in focal length and f/number at the same time enables an increased focal length without having to increase the aperture size by the ratio of the focal length change. The large field of view change is achieved by both the motion of the lens, and the use of the spectral properties of the materials that change with wavelength. The change in spectral bands is accomplished via the use of a spectral filter wheel.

Citation Download Citation

Jay N. Vizgaitis, Kyle Witte, Roy Littleton, and Philip Perconti "Compact dual field of view SWIR/MWIR optical system", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 801225 (20 May 2011); https://doi.org/10.1117/12.888097

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