Reddick, ConorCasado, CintiaReynolds, KenStanley, SimonPablos, CristinaMarugán, Javier2023-10-102023-10-102023Conor Reddick, Cintia Casado, Ken Reynolds, Simon Stanley, Cristina Pablos, Javier Marugán, Evaluation of the uniformity of UVA LED illumination on flat surfaces: Discrete ordinate method, single axis, and surface scanning radiometry, Heliyon, Volume 9, Issue 6, 2023, e16557, ISSN 2405-8440, https://doi.org/10.1016/j.heliyon.2023.e165572405-8440https://hdl.handle.net/10115/24802The authors acknowledge the financial support of the European Union's Horizon 2020 research and innovation programme in the frame of REWATERGY, Sustainable Reactor Engineering for Applications on the Water-Energy Nexus, MSCA-ITN-EID Project N. 812574.Uniform illumination from UVA LED lamps is a crucial design characteristic for a range of industries including photocatalytic applications. In this work, radiometry and the discrete ordinate method (DOM) are used to determine the ideal target surface size and working distance from a UVA LED lamp for highly uniform illumination. Horizontal incident radiation and full surface incident radiation measurements were conducted using a scanning radiometry technique. It is shown that horizontal incident and full surface incident radiation measurements show good agreement for uniformity measurements over a range of working distances, with maximum uniformity (2.6% and 3.6% standard deviation respectively) over the measured range found at 15 mm working distance. DOM simulation results showed good agreement with radiometry for power and incident radiation measurements, whilst indicating a maximum uniformity at 20 mm working distance. These results demonstrate that DOM simulations can be used as a fast, low cost, and reliable indication of surface uniformity, peak surface irradiance, and power measurements in the design of UV lamps for industrial and academic applications.engAtribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/LED LampRadiometrySpectroscopySimulationDiscrete ordinate methodinfo:eu-repo/semantics/article10.1016/j.heliyon.2023.e16557info:eu-repo/semantics/openAccess