Mr. Ankur Jain Profile

Ankur Jain

at Space Applications Ctr

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Proceedings Article | 2 May 2016 Paper

Design, development, characterization and qualification of infrared focal plane area array detectors for space-borne imaging applications

Ankur Jain, Arup Banerjee

Proceedings Volume 9881, 988114 (2016) https://doi.org/10.1117/12.2222994

KEYWORDS: Sensors, Infrared imaging, Infrared radiation, Readout integrated circuits, Infrared detectors, Staring arrays, Cryogenics, Image sensors, Infrared sensors, Imaging systems, Optical filters, Temperature metrology, Skin

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This paper discusses the design, development, characterization and qualification aspects of large format Infrared Focal Plane Arrays (IRFPA) required for panchromatic, multi-, hyper- and ultra-spectral imaging applications from a space-borne imager. Detection of feeble radiant flux from the intended target in narrow spectral bands requires a highly sensitive low noise sensor array with high well capacity. For this the photodiode arrays responsive in desired spectral band are grown using different growth techniques and flip-chip bonded with a suitable Si Read-out ICs (ROICs) for signal conditioning. IR detectors require cryogenic cooling to achieve background limited performance. Although passive radiative cooling is always the preferred choice of cooling in space, it is not suitable for cooling IRFPAs due to high thermal loads. To facilitate characterization of IRFPAs and cool them to desired cryogenic temperature, an Integrated Detector Dewar Cooler Assembly (IDDCA) is essential where the detector array sits over the cold tip of an active cooler and the detector cooler assembly is vacuum sealed in a thermally isolated Dewar. A cold shield above the sensor array inside the Dewar restricts its field-of-view and a cold filter fine tunes its spectral response. In this paper, various constituents of an IRFPA like sensor array materials, growth techniques, ROICs, filters, cold shields, cooling techniques etc., their types and selection criteria for different applications are discussed in detail. Design aspects of IRFPA characterization test bench, challenges involved in radiometric and spectral characterization and space qualification of such IDDCA based IRFPAs are also discussed.

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