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Proceedings Paper

A compact thermal infrared imaging radiometer with high spatial resolution and wide swath for a small satellite using a large format uncooled infrared focal plane array
Author(s): Kenji Tatsumi; Fumihiro Sakuma; Masakuni Kikuchi; Jun Tanii; Toneo Kawanishi; Shinichi Ueno; Hideki Kuga
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Paper Abstract

In this paper, we present a feasibility study for the potential of a high spatial resolution and wide swath thermal infrared (TIR) imaging radiometer for a small satellite using a large format uncooled infrared focal plane array (IR-FPA). The preliminary TIR imaging radiometer designs were performed. One is a panchromatic (mono-band) imaging radiometer (8-12μm) with a large format 2000 x 1000 pixels uncooled IR-FPA with a pixel pitch of 15 μm. The other is a multiband imaging radiometer (8.8μm, 10.8μm, 11.4μm). This radiometer is employed separate optics and detectors for each wave band. It is based on the use of a 640 x 480 pixels uncooled IR-FPA with a pixel pitch of 25 μm. The thermal time constant of an uncooled IR-FPA is approximately 10-16ms, and introduces a constraint to the satellite operation to achieve better signal-to-noise ratio, MTF and linearity performances. The study addressed both on-ground time-delayintegration binning and staring imaging solutions, although a staring imaging was preferred after trade-off. The staring imaging requires that the line of sight of the TIR imaging radiometer gazes at a target area during the acquisition time of the image, which can be obtained by rotating the satellite or a steering mirror around the pitch axis. The single band radiometer has been designed to yield a 30m ground sample distance over a 30km swath width from a satellite altitude of 500km. The radiometric performance, enhanced with staring imaging, is expected to yield a NETD less than 0.5K for a 300K ground scene. The multi-band radiometer has three spectral bands with spatial resolution of 50m and swath width of 24km. The radiometric performance is expected to yield a NETD less than 0.85K. We also showed some preliminary simulation results on volcano, desert/urban scenes, and wildfire.

Paper Details

Date Published: 7 October 2014
PDF: 11 pages
Proc. SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 92411F (7 October 2014); doi: 10.1117/12.2065658
Show Author Affiliations
Kenji Tatsumi, Japan Space Systems (Japan)
Fumihiro Sakuma, Japan Space Systems (Japan)
Masakuni Kikuchi, Japan Space Systems (Japan)
Jun Tanii, Japan Space Systems (Japan)
Toneo Kawanishi, Japan Space Systems (Japan)
Shinichi Ueno, Mitsubishi Electric Corp. (Japan)
Hideki Kuga, Mitsubishi Electric Corp. (Japan)


Published in SPIE Proceedings Vol. 9241:
Sensors, Systems, and Next-Generation Satellites XVIII
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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