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oai:jaxa.repo.nii.ac.jp:00022398 2023-06-20T19:26:52Z 1887:1888

Radiometric Calibration of Compact Infrared Camera (CIRC) for Earth Observation 加藤, 恵理 片山, 晴善 内藤, 聖貴 原田, 昌朋 Nakamura, Ryoko 酒井, 理人 中島, 康裕 Nakau, Koji 丹下, 義夫 佐藤, 亮太 Kato, Eri Katayama, Haruyoshi Naitoh, Masataka Harada, Masatomo Nakamura, Ryoko Sakai, Michito Nakajima, Yasuhiro Nakau, Koji Tange, Yoshio Sato, Ryota （C）2014 MYU TOKYO remote sensing; uncooled infrared detector; wildfire; ALOS-2; JEM-CALET We have developed a compact infrared camera (CIRC) with an uncooled infrared array detector (microbolometer) for space application. CIRC is the first microbolometer sensor without a calibration function in orbit, like a shutter system or an onboard blackbody. The main objective of the CIRC is the technology demonstration of wildfire detection. Microbolometers are suitable for application in resource-limited sensor systems or small satellites because no cooling systems are required. Another main characteristic of the CIRC is its use of athermal optics. The athermal optics system compensates for defocus occurring owing to temperature changes. The CIRC achieves a small size (approximately 200 mm), light mass (approximately 3 kg), and low electrical power consumption (<20 W) by employing athermal optics and a shutterless system. The shutterless system suggests the need to devise a method of achieving stray-light correction and temperature calibration without the use of a mechanical shutter for calibration. We completed the ground calibration test of the CIRC Proto Flight Model (PFM) in a vacuum environment and at ambient temperature ranging from -15 to 50 °C using blackbody images at various temperatures (-30 to 50 °C), and accomplished the method of temperature correction to achieve temperature accuracy of 4 K without a calibration function. In this paper, we report on the constructed radiometric algorithm and results relevant to imaging and radiometric quality. 資料番号: PA1410031000 MYU TOKYO 2014 eng journal article VoR https://jaxa.repo.nii.ac.jp/records/22398 https://doi.org/10.18494/SAM.2014.969 info:doi/10.18494/SAM.2014.969 0914-4935 AA10790969 Sensors and Materials 26 4 199 214 https://jaxa.repo.nii.ac.jp/record/22398/files/PA1410031.pdf application/pdf 2.4 MB 2020-01-22