Challenges, constraints, and results of lens design for 17 micron-bolometer focal plane arrays in 8-12 micron waveband

Norbert Schuster; John Franks

doi:10.1117/12.882510

20 May 2011 Challenges, constraints, and results of lens design for 17 micron-bolometer focal plane arrays in 8-12 micron waveband

Norbert Schuster, John Franks

Author Affiliations +

Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 80122B (2011) https://doi.org/10.1117/12.882510
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

In the 8-12 micron waveband Focal Plane Arrays (FPA) are available with a 17 micron pixel pitch in different arrays sizes (e.g. 512 x 480 pixels and 320 x 240 pixels) and with excellent electrical properties. Many applications become possible using this new type of IR-detector which will become the future standard in uncooled technology. Lenses with an f-number faster than f/1.5 minimize the diffraction impact on the spatial resolution and guarantee a high thermal resolution for uncooled cameras. Both effects will be quantified. The distinction between Traditional f-number (TF) and Radiometric f-number (RF) is discussed. Lenses with different focal lengths are required for applications in a variety of markets. They are classified by their Horizontal field of view (HFOV). Respecting the requirements for high volume markets, several two lens solutions will be discussed. A commonly accepted parameter of spatial resolution is the Modulation Transfer Function (MTF)-value at the Nyquist frequency of the detector (here 30cy/mm). This parameter of resolution will be presented versus field of view. Wide Angle and Super Wide Angle lenses are susceptible to low relative illumination in the corner of the detector. Measures to reduce this drop to an acceptable value are presented.

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Norbert Schuster and John Franks "Challenges, constraints, and results of lens design for 17 micron-bolometer focal plane arrays in 8-12 micron waveband", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80122B (20 May 2011); https://doi.org/10.1117/12.882510

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