Facility for Determining Action Spectra of UV Photodegradation

Anna Vaskuri, Petri Kärhä, Heikkilä, Anu, Erkki Ikonen

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

1 Citation (Scopus)
49 Downloads (Pure)


We have developed an ultraviolet (UV) ageing facility consisting of a spectrograph which can be used to expose material samples with spectrally dispersed UV radiation at the wavelength range 273 – 423 nm, and an automated, high-resolution laser-based setup for measuring the induced color changes in the transmittances of the exposed samples. The samples are scanned using a suitable laser wavelength to obtain the wavelength dependence on the color change. The locations on the samples are converted to exposure wavelengths with the known dispersion of the spectrograph. We demonstrate the facility by exposing and measuring a set of atactic polystyrene sheets. By studying samples aged for different time periods we derive a complex action spectrum for the photoyellowing that is nonlinear with respect to the radiant exposure. We further derive linear activation spectra for the photoyellowing demonstrating how they depend on the selected threshold level.
Original languageEnglish
Title of host publicationRadiation Processes in the Atmosphere and Ocean (IRS2016)
Subtitle of host publicationProceedings of the International Radiation Symposium (IRC/IAMAS)
EditorsRoger Davies, Luca Egli, Werner Schmutz
PublisherAIP Publishing
Number of pages4
ISBN (Print)978-0-7354-1478-5
Publication statusPublished - 2017
MoE publication typeA4 Conference publication
EventInternational Radiation Symposium: Radiation Processes in the Atmosphere and Ocean - Auckland, New Zealand
Duration: 16 Apr 201622 Apr 2016

Publication series

NameAIP Conference Proceedings
PublisherAIP Publishing
ISSN (Print)0094-243X


ConferenceInternational Radiation Symposium
Abbreviated titleIRS
Country/TerritoryNew Zealand


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