Luminance calibration of a full sky HDR imaging system using sky scanner measurements

García Ruiz, Ignacio; Sáenz Gamasa, Carlos; Hernández Salueña, Begoña; García Santos, Rafael; Torres Escribano, José Luis

Publication:
Luminance calibration of a full sky HDR imaging system using sky scanner measurements

dc.contributor.author	García Ruiz, Ignacio
dc.contributor.author	Sáenz Gamasa, Carlos
dc.contributor.author	Hernández Salueña, Begoña
dc.contributor.author	García Santos, Rafael
dc.contributor.author	Torres Escribano, José Luis
dc.contributor.department	Zientziak	eu
dc.contributor.department	Ingeniaritza	eu
dc.contributor.department	Institute of Smart Cities - ISC	en
dc.contributor.department	Institute for Advanced Materials and Mathematics - INAMAT2	en
dc.contributor.department	Ciencias	es_ES
dc.contributor.department	Ingeniería	es_ES
dc.date.accessioned	2022-07-19T06:59:47Z
dc.date.available	2022-07-19T06:59:47Z
dc.date.issued	2022
dc.date.updated	2022-06-22T09:04:25Z
dc.description.abstract	A full sky High Dynamic Range imaging system, based on a Single-Lens Reflex camera with a fisheye lens, has been constructed and calibrated with a sky scanner luminance meter. The method considers the geometrical, spectral, timing and orientation issues between instruments. The calibration data sets, having nearly simultaneous measurements under stable sky conditions, were obtained from approximately one month of data using selection variables based in the experimental design. For luminance estimation we use the standard 𝐶𝐼𝐸𝑌 RGB combination and a Spectrally Matched Luminance (𝑆𝑀𝐿) predictor, matching the spectral response of the instruments. With 738 calibration points having luminances up to 23.6 kcd∕m2, covering 98.5% of the sky luminance range, 𝐶𝐼𝐸𝑌 is linearly correlated with sky scanner measurements with a coefficient of determination 𝑅2 = 0.9927 and a Root Mean Squared Error (𝑅𝑀𝑆𝐸) of 7.7%. 𝑆𝑀𝐿 gives better results, with 𝑅2 = 0.9973 and 𝑅𝑀𝑆𝐸 = 5.3%. With 253 calibration points with luminances up to 12.9 kcd∕m2, comprising 94.1% of the sky luminance range, both predictors clearly improve, with 𝑅2 = 0.9964 and 𝑅𝑀𝑆𝐸 = 4.1% in case of 𝐶𝐼𝐸𝑌 and 𝑅2 = 0.9982 and 𝑅𝑀𝑆𝐸 = 2.9% in case of 𝑆𝑀𝐿.	en
dc.description.sponsorship	This work was performed in the framework of the IRILURREFLEX, Spain project (ENE2017-86974-R), financed by the Spanish State Research Agency (Agencia Estatal de Investigación, AEI) and the European Regional Development Fund (Fondo Europeo de Desarrollo Regional, FEDER).	en
dc.format.extent	23 p.
dc.format.mimetype	application/pdf	en
dc.format.mimetype	application/zip	en
dc.format.mimetype	video/mp4	en
dc.identifier.citation	García, I.; Sáenz, C.; Hernández, B.; García, R.; Torres, J. L. (2022). Luminance calibration of a full sky HDR imaging system using sky scanner measurements. Solar Energy. 239, 147-169	en
dc.identifier.doi	10.1016/j.solener.2022.04.048
dc.identifier.issn	0038-092X
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/43345
dc.language.iso	eng	en
dc.publisher	Solar Energy Society	en
dc.relation.ispartof	Solar Energy, 2022, 239,p. 147-169	en
dc.relation.projectID	info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-86974-R/ES/	en
dc.relation.publisherversion	https://doi.org/10.1016/j.solener.2022.04.048
dc.rights	© 2022 The Author(s).This is an open access article under the CC BY-NC-ND license	en
dc.rights.accessRights	Acceso abierto / Sarbide irekia	es
dc.rights.accessRights	info:eu-repo/semantics/openAccess	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject	HDR imaging	en
dc.subject	Sky luminance	en
dc.subject	Sky scanner	en
dc.subject	Sky imager	en
dc.subject	Luminance calibration	en
dc.title	Luminance calibration of a full sky HDR imaging system using sky scanner measurements	en
dc.type	info:eu-repo/semantics/article
dc.type.version	Versión publicada / Argitaratu den bertsioa	es
dc.type.version	info:eu-repo/semantics/publishedVersion	en
dspace.entity.type	Publication
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