1 September 1992 Resolution improvement for HgCdTe IRCCD
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Abstract
This paper describes a resolution improvement for a mercury cadmium telluride (MCT) infrared charge-coupled device (IRCCD) using a new microscanner. To keep the microscanner compact, the scanner prism is placed between the lens and the IRCCD, and driven by a bimorph piezoelectric actuator. By compensating the drive pulse and optimizing the prism thickness, the microscanner gives a fast and stable response with low distortion. The medium wavelength imager developed for the microscanner gives a 128 X 128 pixel thermal image in the 3 to 5 micrometers band using a 64 X 64 element IRCCD. The Nyquist frequency was increased from 10 to 20 cycles/mm to reduce aliasing without decreasing the S/N ratio. The noise equivalent temperature difference (NETD) was measured at 0.06 K with an f-1.7 lens. The modulation transfer function (MTF) was estimated by considering the scan distortion and the pixel aperture profile. By optimizing the aperture profile of the photodiode, the MTF at the Nyquist frequency was increased from 0 to 20%.
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Kenji Awamoto, Kenji Awamoto, Yuichiro Ito, Yuichiro Ito, Hiroyuki Ishizaki, Hiroyuki Ishizaki, Yutaka Yoshida, Yutaka Yoshida, } "Resolution improvement for HgCdTe IRCCD", Proc. SPIE 1685, Infrared Detectors and Focal Plane Arrays II, (1 September 1992); doi: 10.1117/12.137814; https://doi.org/10.1117/12.137814
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