Absorptance measurement for sloping bottom cavity of cryogenic radiometer

Xiaolong, 衣小龙 Yi; Zhenling, 杨振岭 Yang; Xin, 叶新 Ye; Kai, 王凯 Wang; Wei, 方伟 Fang; Yu-peng, 王玉鹏 Wang

doi:10.3788/ope.20152310.2733

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The internal surface of the blackbody cavity is sprayed by the black paint. Experimental measurement results illustrate that the blackbody cavity absorption is 0.999928 ± 0.000006 (1 ) at a wavelength of 632 nm [27]. The incoming optical source is repeatedly reflected and absorbed, and converts to a temperature rise of the blackbody cavity.…”

Section: Detectormentioning

confidence: 95%

Design and investigation of absolute radiance calibration primary radiometer

Fang

et al. 2018

IET Science, Measurement & Technology

View full text Add to dashboard Cite

Section: Detectormentioning

confidence: 95%

Design and investigation of absolute radiance calibration primary radiometer

Fang

et al. 2018

IET Science, Measurement & Technology

View full text Add to dashboard Cite

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%

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

Lin

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

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.

show abstract

Development of the Chinese Space-Based Radiometric Benchmark Mission LIBRA

Zhang

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

Climate observations and their applications require measurements with high stability and low uncertainty in order to detect and assess climate variability and trends. The difficulty with space-based observations is that it is generally not possible to trace them to standard calibration references when in orbit. In order to overcome this problem, it has been proposed to deploy space-based radiometric reference systems which intercalibrate measurements from multiple satellite platforms. Such reference systems have been strongly recommended by international expert teams. This paper describes the Chinese Space-based Radiometric Benchmark (CSRB) project which has been under development since 2014. The goal of CSRB is to launch a reference-type satellite named LIBRA in around 2025. We present the roadmap for CSRB as well as requirements and specifications for LIBRA. Key technologies of the system include miniature phase-change cells providing fixed-temperature points, a cryogenic absolute radiometer, and a spontaneous parametric down-conversion detector. LIBRA will offer measurements with SI traceability for the outgoing radiation from the Earth and the incoming radiation from the Sun with high spectral resolution. The system will be realized with four payloads, i.e., the Infrared Spectrometer (IRS), the Earth-Moon Imaging Spectrometer (EMIS), the Total Solar Irradiance (TSI), and the Solar spectral Irradiance Traceable to Quantum benchmark (SITQ). An on-orbit mode for radiometric calibration traceability and a balloon-based demonstration system for LIBRA are introduced as well in the last part of this paper. As a complementary project to the Climate Absolute Radiance and Refractivity Observatory (CLARREO) and the Traceable Radiometry Underpinning Terrestrial- and Helio- Studies (TRUTHS), LIBRA is expected to join the Earth observation satellite constellation and intends to contribute to space-based climate studies via publicly available data.

show abstract

Absorptance measurement for sloping bottom cavity of cryogenic radiometer

Cited by 3 publications

References 0 publications

Design and investigation of absolute radiance calibration primary radiometer

Design and investigation of absolute radiance calibration primary radiometer

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

Development of the Chinese Space-Based Radiometric Benchmark Mission LIBRA

Contact Info

Product

Resources

About