Revisiting simple methods to estimate drop size distributions: a novel approach based on infrared thermography

• Published in: Journal of Hydrology and Hydromechanics Vol. 63; no. 3; pp. 220 - 227
• Main Authors: Lima, João L.M.P. de, Silva, Valdemir P., Lima, M. Isabel P. de, Abrantes, João R.C.B., Montenegro, Abelardo A.A.
• Format: Journal Article
• Language: English; Czech; Slovak
• Published: Bratislava De Gruyter Open 01.09.2015; De Gruyter Poland; Sciendo
• Subjects: Boards; Drop diameters; Drop size; Drop size distributions; Hydrology; Infrared; Mathematical analysis; Measurement techniques; Methods; Precipitation; Rain; Raindrops; Rainfall; Thermography; Portugal
• ISSN: 0042-790X; 0042-790X; 1338-4333
• DOI: 10.1515/johh-2015-0025

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.