Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography
The infrared thermography has been successfully applied as a tool for high resolution imaging in different hydrological studies. This exploratory experimental study aimed at evaluating the possibility of using infrared thermography to determine the diameter of raindrops. Rain samples are collected o...
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doaj-cf3dfaa1debe423794ba412013f511462021-09-06T19:40:47ZengSciendoJournal of Hydrology and Hydromechanics0042-790X2015-09-0163322022710.1515/johh-2015-0025johh-2015-0025Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermographyLima João L.M.P. de0Silva Valdemir P.1Lima M. Isabel P. de2Abrantes João R.C.B.3Montenegro Abelardo A.A.4Department of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, PortugalRural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, BrazilDepartment of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, PortugalDepartment of Civil Engineering, Faculty of Science and Technology of the University of Coimbra (FCTUC), Rua Luís Reis Santos, Campus II - University of Coimbra, 3030-788 Coimbra, PortugalRural Federal University of Pernambuco, Department of Agricultural Engineering, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 50910-130 Recife, PE, BrazilThe infrared thermography has been successfully applied as a tool for high resolution imaging in different hydrological studies. This exploratory experimental study aimed at evaluating the possibility of using infrared thermography to determine the diameter of raindrops. Rain samples are collected on a pre-heated acrylic board, which is exposed to rain during an instant, and thermograms are recorded. The area of the thermal stains (“signatures” of the raindrops) emerging on the board is measured and converted to drop diameters, applying a calibration equation. Diameters of natural raindrops estimated using this technique were compared with laser disdrometer measurements; the Nash-Sutcliffe efficiency coefficient was used for evaluating the match between the resulting histograms of drop size distribution. Results confirm the usefulness of this simple technique for sizing and counting raindrops, although it is unsatisfactory in light rain or drizzle.https://doi.org/10.1515/johh-2015-0025rainfallthermographydrop size distributionsdrop diameters |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lima João L.M.P. de Silva Valdemir P. Lima M. Isabel P. de Abrantes João R.C.B. Montenegro Abelardo A.A. |
spellingShingle |
Lima João L.M.P. de Silva Valdemir P. Lima M. Isabel P. de Abrantes João R.C.B. Montenegro Abelardo A.A. Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography Journal of Hydrology and Hydromechanics rainfall thermography drop size distributions drop diameters |
author_facet |
Lima João L.M.P. de Silva Valdemir P. Lima M. Isabel P. de Abrantes João R.C.B. Montenegro Abelardo A.A. |
author_sort |
Lima João L.M.P. de |
title |
Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
title_short |
Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
title_full |
Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
title_fullStr |
Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
title_full_unstemmed |
Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
title_sort |
revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography |
publisher |
Sciendo |
series |
Journal of Hydrology and Hydromechanics |
issn |
0042-790X |
publishDate |
2015-09-01 |
description |
The infrared thermography has been successfully applied as a tool for high resolution imaging in different hydrological studies. This exploratory experimental study aimed at evaluating the possibility of using infrared thermography to determine the diameter of raindrops. Rain samples are collected on a pre-heated acrylic board, which is exposed to rain during an instant, and thermograms are recorded. The area of the thermal stains (“signatures” of the raindrops) emerging on the board is measured and converted to drop diameters, applying a calibration equation. Diameters of natural raindrops estimated using this technique were compared with laser disdrometer measurements; the Nash-Sutcliffe efficiency coefficient was used for evaluating the match between the resulting histograms of drop size distribution. Results confirm the usefulness of this simple technique for sizing and counting raindrops, although it is unsatisfactory in light rain or drizzle. |
topic |
rainfall thermography drop size distributions drop diameters |
url |
https://doi.org/10.1515/johh-2015-0025 |
work_keys_str_mv |
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1717767840837140480 |