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Design and characterization of thin multiple aperture infrared cameras

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Abstract

We describe a multiple-aperture long-wave infrared camera built on an uncooled microbolometer array with the objective of decreasing camera thickness. The 5mm thick optical system is an f/1.2 design with a 6.15mm effective focal length. An integrated image is formed from the subapertures using correlation-based registration and a least gradient reconstruction algorithm. We measure a 131mK NETD. The system’s spatial frequency is analyzed with 4  bar targets. With proper calibration, our multichannel interpolation results recover contrast for targets at frequencies beyond the aliasing limit of the individual subimages.

© 2009 Optical Society of America

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