Correction of cavity absorptance measure method for cryogenic radiometer

Yi, Xiaolong; Fang, Wei; Luo, Yang; Xia, Zhiyong; Wang, Yupeng

doi:10.1049/iet-smt.2015.0267

Cited by 9 publications

(2 citation statements)

References 17 publications

(21 reference statements)

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Section: Cryogenic Absolute Measurementmentioning

confidence: 99%

“…The internal surface of the blackbody cavity is sprayed with black paint. Experimental measurement results illustrated that the blackbody cavity absorption is 0.999928 ± 0.000006 (1σ) at a wavelength of 632 nm [52][53][54][55]. The three-stage heat transfer structure is designed for the connection between the blackbody cavity and the SPTC.…”

Section: Cryogenic Absolute Measurementmentioning

confidence: 99%

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Instrument Development: Chinese Radiometric Benchmark of Reflected Solar Band Based on Space Cryogenic Absolute Radiometer

Lin

et al. 2020

Remote Sensing

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Low uncertainty and long-term stability remote data are urgently needed for researching climate and meteorology variability and trends. Meeting these requirements is difficult with in-orbit calibration accuracy due to the lack of radiometric satellite benchmark. The radiometric benchmark on the reflected solar band has been under development since 2015 to overcome the on-board traceability problem of hyperspectral remote sensing satellites. This paper introduces the development progress of the Chinese radiometric benchmark of the reflected solar band based on the Space Cryogenic Absolute Radiometer (SCAR). The goal of the SCAR is to calibrate the Earth–Moon Imaging Spectrometer (EMIS) on-satellite using the benchmark transfer chain (BTC) and to transfer the traceable radiometric scale to other remote sensors via cross-calibration. The SCAR, which is an electrical substitution absolute radiometer and works at 20 K, is used to realize highly accurate radiometry with an uncertainty level that is lower than 0.03%. The EMIS, which is used to measure the spectrum radiance on the reflected solar band, is designed to optimize the signal-to-noise ratio and polarization. The radiometric scale of the SCAR is converted and transferred to the EMIS by the BTC to improve the measurement accuracy and long-term stability. The payload of the radiometric benchmark on the reflected solar band has been under development since 2018. The investigation results provide the theoretical and experimental basis for the development of the reflected solar band benchmark payload. It is important to improve the measurement accuracy and long-term stability of space remote sensing and provide key data for climate change and earth radiation studies.

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Section: Cryogenic Absolute Measurementmentioning

confidence: 99%

Section: Cryogenic Absolute Measurementmentioning

confidence: 99%