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2nd and 3rd generation thermal imagers based on type-II superlattice photodiodes

Wärmebildgeräte der zweiten und dritten Generation auf Basis von Typ-II Übergitter-Photodioden
: Rehm, R.; Walther, M.; Schmitz, J.; Fleißner, J.; Ziegler, J.; Cabanski, W.; Breiter, R.


Longshore, R.E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Infrared and photoelectronic imagers and detector devices II : 13 - 14 August 2006, San Diego, California, USA
Bellingham/Wash.: SPIE, 2006 (SPIE Proceedings Series 6294)
ISBN: 0-8194-6373-6
Paper 629404
Conference "Infrared and Photoelectronic Imagers and Detector Devices" <2, 2006, San Diego/Calif.>
Conference Paper
Fraunhofer IAF ()
InAs/GaSb type-II superlattice; InAs/GaSb Typ-II Übergitter; missile warning; Raketenwarnsensorik; dual-band; Zweiband; dual-color; Zweifarben; bispectral; bispektral; infrared camera; Infrarotkamera; thermal imaging; Thermographie; focal plane array; Bildfeldmatrix

We report on the development of InAs/GaSb type-II superlattice focal plane arrays (FPAs) for missile warning systems in airborne platforms. The FPA fabrication technology was developed on the basis of monospectral superlattices for the MWIR (3-5 µm) spectral range. A monospectral 288x384 MWIR camera with 24 µm pixel pitch, a noise equivalent temperature difference (NETD) better than 14 mK and a background-limited performance (BLIP) up to 92 K is demonstrated. Based on the monospectral technology, the first bispectral superlattice camera was realized. The dual color 288x384 superlattice camera features simultaneous, pixel-registered detection of both spectral channels between 3-4 µm and 4-5 µm with a NETD better than 30 mK and 17 mK, respectively. Hence, spatial or temporal registration problems, which are common to most dual color and dual band infrared imagers are solved with the new bispectral MWIR missile alerting sensor.