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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 20 — Jul. 10, 2007
  • pp: 4222–4227

Improving solar ultraviolet irradiance measurements by applying a temperature correction method for Teflon diffusers

Evelyn Jäkel, Peter N. den Outer, Rick B. Tax, Peter C. Görts, and Henk A. J. M. Reinen  »View Author Affiliations


Applied Optics, Vol. 46, Issue 20, pp. 4222-4227 (2007)
http://dx.doi.org/10.1364/AO.46.004222


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Abstract

To establish trends in surface ultraviolet radiation levels, accurate and stable long-term measurements are required. The accuracy level of today's measurements has become high enough to notice even smaller effects that influence instrument sensitivity. Laboratory measurements of the sensitivity of the entrance optics have shown a decrease of as much as 0.07–0.1%∕deg temperature increase. Since the entrance optics can heat to greater than 45 ° C in Dutch summers, corrections are necessary. A method is developed to estimate the entrance optics temperatures from pyranometer measurements and meteorological data. The method enables us to correct historic data records for which temperature information is not available. The temperature retrieval method has an uncertainty of less than 2.5   ° C , resulting in a 0.3% uncertainty in the correction to be performed. The temperature correction improves the agreement between modeled and measured doses and instrument intercomparison as performed within the Quality Assurance of Spectral Ultraviolet Measurements in Europe project. The retrieval method is easily transferable to other instruments.

© 2007 Optical Society of America

OCIS Codes
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: November 10, 2006
Revised Manuscript: March 8, 2007
Manuscript Accepted: March 30, 2007
Published: June 20, 2007

Citation
Evelyn Jäkel, Peter N. den Outer, Rick B. Tax, Peter C. Görts, and Henk A. J. M. Reinen, "Improving solar ultraviolet irradiance measurements by applying a temperature correction method for Teflon diffusers," Appl. Opt. 46, 4222-4227 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-20-4222


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References

  1. J. Gröbner, J. Schreder, S. Kazadzis, A. F. Bais, M. Blumthaler, P. Görts, R. Tax, T. Koskela, G. Seckmeyer, A. R. Webb, and D. Rembges, "Traveling reference spectroradiometer for routine quality assurance of spectral solar ultraviolet irradiance measurements," Appl. Opt. 44, 5321-5331 (2005). [CrossRef] [PubMed]
  2. J. Göbner, M. Blumthaler, S. Kazadzis, A. Bais, A. Webb, J. Schreder, G. Seck-meyer, and D. Rembges, "Quality assurance of spectral solar UV measurements: results from 25 UV monitoring sites in Europe, 2002 to 2004," Metrologia 43, S66-S71 (2006). [CrossRef]
  3. J. Gröbner and P. Sperfeld, "Direct traceability of the portable QASUME irradiance scale to the primary irradiance standard of the PTB," Metrologia 42, 134-139 (2005). [CrossRef]
  4. L. Ylianttila and J. Schreder, "Temperature effects of PTFE diffusers," Opt. Mater. 27, 1811-1814 (2005). [CrossRef]
  5. P. N. den Outer, H. Slaper, and R. B. Tax, "UV radiation in the Netherlands: Assessing long-term variability and trends in relation to ozone and clouds," J. Geophys. Res. 110, doi: (2005). [CrossRef]
  6. A. F. McKinley and B. L. Diffey, "A reference action spectrum for ultraviolet induced erythema in human skin," CIE J. 6, 17-22 (1987).

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