Facility for determining action spectra of UV photodegradation

Anna Vaskuri (Corresponding author), Petri Kärhä, Anu Heikkilä, Erkki Ikonen

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

    1 Citation (Scopus)


    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, Werner Schmutz, Luca Egli
    PublisherAmerican Institute of Physics (AIP)
    Number of pages4
    ISBN (Print)978-0-7354-1478-5
    Publication statusPublished - 22 Feb 2017
    MoE publication typeA4 Article in a conference publication
    EventInternational Radiation Symposium 2016, IRS 2016: Radiation Processes in the Atmosphere and Ocean - Auckland, New Zealand
    Duration: 16 Apr 201722 Apr 2017

    Publication series

    SeriesAIP Conference Proceedings


    ConferenceInternational Radiation Symposium 2016, IRS 2016
    Abbreviated titleIRS 2016
    Country/TerritoryNew Zealand


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