Simultaneous multispectral framing infrared camera using an embedded diffractive optical lenslet array

Michele Hinnrichs

doi:10.1117/12.886310

20 May 2011 Simultaneous multispectral framing infrared camera using an embedded diffractive optical lenslet array

Michele Hinnrichs

Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 80120B (2011) https://doi.org/10.1117/12.886310
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Recent advances in micro-optical element fabrication using gray scale technology have opened up the opportunity to create simultaneous multi-spectral imaging with fine structure diffractive lenses. This paper will discuss an approach that uses diffractive optical lenses configured in an array (lenslet array) and placed in close proximity to the focal plane array which enables a small compact simultaneous multispectral imaging camera [1]. The lenslet array is designed so that all lenslets have a common focal length with each lenslet tuned for a different wavelength. The number of simultaneous spectral images is determined by the number of individually configured lenslets in the array. The number of spectral images can be increased by a factor of 2 when using it with a dual-band focal plane array (MWIR/LWIR) by exploiting multiple diffraction orders. In addition, modulation of the focal length of the lenslet array with piezoelectric actuation will enable spectral bin fill-in allowing additional spectral coverage while giving up simultaneity. Different lenslet array spectral imaging concept designs are presented in this paper along with a unique concept for prefiltering the radiation focused on the detector. This approach to spectral imaging has applications in the detection of chemical agents in both aerosolized form and as a liquid on a surface. It also can be applied to the detection of weaponized biological agent and IED detection in various forms from manufacturing to deployment and post detection during forensic analysis.

Citation Download Citation

Michele Hinnrichs "Simultaneous multispectral framing infrared camera using an embedded diffractive optical lenslet array", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80120B (20 May 2011); https://doi.org/10.1117/12.886310

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