UV exposure in artificial and natural weathering: A comparative study

A. Heikkilä*, S Kazadzis, Outi Meinander, A. Vaskuri, P. Kärhä, Ville Mylläri, S Syrjälä, Tapani Koskela

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)
15 Downloads (Pure)


We report on a study focusing on UV exposure conditions in three different types of chambers used for accelerated ageing of materials. The first chamber is equipped with four 300-W UVA/UVB mercury vapour lamps (Ultra-Vitalux/Osram). The second chamber uses four 40-W UVA fluorescent lamps (QUV-340/Q-Lab). The third chamber is Weather-Ometer Ci3000+ from Atlas with a 4500-W xenon arc lamp. UV irradiance prevailing in each chamber was measured using Bentham DM150 double monochromator spectroradiometer. The results were compared to measurements of solar spectral UV irradiance at Jokioinen, Finland, with a Brewer MkIII double monochromator spectrophotometer. The spectral shapes of the exposing UV radiation in the different chambers were found to notably differ from each other and from the solar UV spectrum. Both spatial inhomogeneities and temporal variability caused by various factors, like the ageing of the lamps, were detected. The effects were found to strongly depend on wavelength of the exposing UV radiation. The findings of this study underline the necessity of careful characterization of the UV exposure conditions provided by the facilities used in accelerated testing of materials.

Original languageEnglish
Title of host publicationRadiation Processes in the Atmosphere and Ocean, IRS 2016: Proceedings of the International Radiation Symposium (IRC/IAMAS)
PublisherAmerican Institute of Physics
ISBN (Electronic)9780735414785
Publication statusPublished - 22 Feb 2017
MoE publication typeA4 Article in a conference publication
EventInternational Radiation Symposium: Radiation Processes in the Atmosphere and Ocean - Auckland, New Zealand
Duration: 16 Apr 201622 Apr 2016


ConferenceInternational Radiation Symposium
Abbreviated titleIRS
Country/TerritoryNew Zealand


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