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

Abstract

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
Pages813-816
Volume1531
ISBN (Print)978-0-7354-1155-5
DOIs
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventInternational Radiation Symposium (IRC/IAMAS), IRS 2012 - Berlin, Germany
Duration: 6 Aug 201210 Aug 2012

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics
Volume1531
ISSN (Print)0094-243X
ISSN (Electronic)1935-0465

Conference

ConferenceInternational Radiation Symposium (IRC/IAMAS), IRS 2012
Abbreviated titleIRC/IAMAS, IRS 2012
CountryGermany
CityBerlin
Period6/08/1210/08/12

Fingerprint

spectroradiometers
diffusers
zenith
tracing
irradiance
quartz
adjusting
prototypes
computer programs
detectors
simulation

Keywords

  • radiometry
  • solar UV
  • diffusers
  • Monte Carlo analysis

Cite this

Pulli, T., Kärhä, P., Mes, J., Schreder, J., Jaanson, P., & Manoocheri, F. (2013). Improved diffusers for solar UV spectroradiometers. In Radiation Processes in the Atmosphere and Ocean: Proceedings of the International Radiation Symposium (IRC/IAMAS) (Vol. 1531, pp. 813-816). American Institute of Physics AIP. AIP Conference Proceedings, Vol.. 1531 https://doi.org/10.1063/1.4804894
Pulli, Tomi ; Kärhä, Petri ; Mes, Joop ; Schreder, Josef ; Jaanson, Priit ; Manoocheri, Farshid. / Improved diffusers for solar UV spectroradiometers. Radiation Processes in the Atmosphere and Ocean: Proceedings of the International Radiation Symposium (IRC/IAMAS). Vol. 1531 American Institute of Physics AIP, 2013. pp. 813-816 (AIP Conference Proceedings, Vol. 1531).
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Pulli, T, Kärhä, P, Mes, J, Schreder, J, Jaanson, P & Manoocheri, F 2013, Improved diffusers for solar UV spectroradiometers. in Radiation Processes in the Atmosphere and Ocean: Proceedings of the International Radiation Symposium (IRC/IAMAS). vol. 1531, American Institute of Physics AIP, AIP Conference Proceedings, vol. 1531, pp. 813-816, International Radiation Symposium (IRC/IAMAS), IRS 2012, Berlin, Germany, 6/08/12. https://doi.org/10.1063/1.4804894

Improved diffusers for solar UV spectroradiometers. / Pulli, Tomi; Kärhä, Petri; Mes, Joop; Schreder, Josef; Jaanson, Priit; Manoocheri, Farshid.

Radiation Processes in the Atmosphere and Ocean: Proceedings of the International Radiation Symposium (IRC/IAMAS). Vol. 1531 American Institute of Physics AIP, 2013. p. 813-816 (AIP Conference Proceedings, Vol. 1531).

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

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AB - 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.

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Pulli T, Kärhä P, Mes J, Schreder J, Jaanson P, Manoocheri F. Improved diffusers for solar UV spectroradiometers. In Radiation Processes in the Atmosphere and Ocean: Proceedings of the International Radiation Symposium (IRC/IAMAS). Vol. 1531. American Institute of Physics AIP. 2013. p. 813-816. (AIP Conference Proceedings, Vol. 1531). https://doi.org/10.1063/1.4804894