{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T00:36:11Z","timestamp":1760402171032,"version":"build-2065373602"},"reference-count":35,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2020,5,4]],"date-time":"2020-05-04T00:00:00Z","timestamp":1588550400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Key Research and Development Project, China","award":["2018YFB0504602"],"award-info":[{"award-number":["2018YFB0504602"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>We propose a space benchmark sensor with onboard SI (Syst\u00e8me International) traceability by means of quantum optical radiometry. Correlated photon pairs generated by spontaneous parametric down-conversion (SPDC) in nonlinear crystals are used to calibrate the absolute responsivity of a solar observing radiometer. The calibration is systematic, insensitive to degradation and independent of external radiometric standards. Solar spectral irradiance at 380\u20132500 nm is traceable to the photon rate and Planck\u2019s constant with an expected uncertainty of about 0.35%. The principle of SPDC calibration and a prototype design of the solar radiometer are introduced. The uncertainty budget is analyzed in consideration of errors arising from calibration and observation modes.<\/jats:p>","DOI":"10.3390\/rs12091454","type":"journal-article","created":{"date-parts":[[2020,5,4]],"date-time":"2020-05-04T14:00:43Z","timestamp":1588600843000},"page":"1454","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["SI Traceable Solar Spectral Irradiance Measurement Based on a Quantum Benchmark: A Prototype Design"],"prefix":"10.3390","volume":"12","author":[{"given":"Xiaobing","family":"Zheng","sequence":"first","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maopeng","family":"Xia","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenchao","family":"Zhai","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Youbo","family":"Hu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianjun","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yinlin","family":"Yuan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weiwei","family":"Pang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,5,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2253","DOI":"10.1016\/S0273-1177(03)90551-5","article-title":"Traceable Radiometry Underpinning Terrestrial- and Helio-Studies (TRUTHS)","volume":"32","author":"Fox","year":"2003","journal-title":"Adv. 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