Improved diffusers for solar UV spectroradiometers

Tomi Pulli, Petri Kärhä, Joop Mes, Josef Schreder, Priit Jaanson, Farshid Manoocheri

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

    2 Citations (Scopus)


    Diffuser heads whose angular response is proportional to the cosine of the zenith angle are needed for global irradiance measurements. Various material samples were measured for their transmission properties to find out the most promising material candidate for use in an improved solar UV diffuser. Novel bubbled quartz materials were found to be attractive alternatives to the traditional PTFE materials for this purpose. A 3D Monte Carlo particle tracing software was constructed and used to optimize the diffuser design. Integrated cosine error of 2.3% was measured with a raised flat diffuser on a prototype detector. The preliminary simulation results indicate that integrated cosine error can be lowered to 1.7 % or below simply by adjusting the dimensions of a flat diffuser. Integrated cosine error of 0.8 % or below can be reached with shaped diffusers.
    Original languageEnglish
    Title of host publicationRadiation Processes in the Atmosphere and Ocean
    Subtitle of host publicationProceedings of the International Radiation Symposium (IRC/IAMAS)
    PublisherAmerican Institute of Physics (AIP)
    ISBN (Print)978-0-7354-1155-5
    Publication statusPublished - 2013
    MoE publication typeNot Eligible
    EventInternational Radiation Symposium (IRC/IAMAS), IRS 2012 - Berlin, Germany
    Duration: 6 Aug 201210 Aug 2012

    Publication series

    SeriesAIP Conference Proceedings


    ConferenceInternational Radiation Symposium (IRC/IAMAS), IRS 2012
    Abbreviated titleIRC/IAMAS, IRS 2012


    • radiometry
    • solar UV
    • diffusers
    • Monte Carlo analysis


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