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 typeA4 Article in a conference publication
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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