Nyquist-Limited Infrared Detectors (NIRD)
Abstract
(U) The Nyquist-Limited Infrared Detectors (NIRD) program develops high density, long-wave infrared (LWIR) arrays and signal processing to improve capability to image through scattering media such as dust and sand, known as brownout, fog, snow storms, and to enhance situational awareness needed for aircraft navigation. The LWIR provides advantages in imaging through the dust clouds created in helicopter landing especially in desert areas. This obscurant penetration capability of LWIR imaging can be significantly improved when the pixel size is reduced to preserve high frequency information, while at the same time, a practical size optical aperture is maintained with approximately F/1 optics. The obscurant penetration capability of the LWIR focal plane array (FPA) can be further enhanced with signal and imaging processing. The low frequency pedestal in the image caused by the obscurant must be reduced to increase image contrast and the effective dynamic range. The small pixel FPA presents unique challenges in detector design and fabrication and in the interconnection of the detector array to the read-out integrated circuit (ROIC). The origin of noise currents in the detector must be understood and characterized, especially the role of surface currents in the small pixel devices. The method of interconnection must be compatible with large arrays of small pixel elements, achieve a low contact resistance, and reliably interconnect at each pixel across the array. This program will transition via industry upon successful completion.
Document Details
- Document Type
- Accomplishment
- Publication Date
- Oct 01, 2011
- Source ID
- b4739abb13f190e738cfc95513c599fe