Abstract

An ultraviolet calibration center has been established in Davos, Switzerland. It provides a laboratory for characterizing the spectral and angular response of broadband radiometers. The absolute calibration of these instruments is performed through the comparison to the reference spectroradiometer qasume. We present what we believe to be a novel calibration methodology that explicitly includes the information of the angular and spectral response functions. From the results of the latest broadband intercomparison campaign, the typical uncertainties of these instruments could be obtained. Most radiometers have an expanded uncertainty of approximately 7%. The angular response introduces an uncertainty of 0.9%-7.2%, depending on the cosine error of the radiometer.

© 2007 Optical Society of America

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  1. C. Dorno, "Dauerregistrierung der Ortshelligkeit von Davos, Oktober 1919 bis Oktober 1920, mittels der photoelektrischen Zellenmethode," Meteorol. Z 1, 1-8 (1921).
  2. P. Bener, Investigation on the Spectral Intensity of Ultraviolet Sky and Sun + Sky Radiation Under Different Conditions of Cloudless Weather at 1590 m a.s.l., Technical Summary Rep.1 [Contract AF 61(052)-54, 1960].
  3. J. B. Kerr, "Observed dependencies of atmospheric UV radiation and trends," in Solar Ultraviolet Radiation: Modelling, Measurements and Effects, C. S. Zerefos and A. F. Bais, eds. (Berlin, Heidelberg, 1997), pp. 259-266.
  4. 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]
  5. J. Gröbner, M. Blumthaler, S. Kazadzis, A. Bais, A. Webb, J. Schreder, G. Seckmeyer, and D. Rembges, "Quality assurance of spectral solar UV measurements: results from 25 UV monitoring sites in Europe, 2002 to 2004," Metrologia 43, 66-71 (2006).
    [CrossRef]
  6. M. Blumthaler, "Quality assurance and quality control methodologies within the Austrian UV monitoring network," Radiat. Prot. Dosim. 111, 359-362 (2004).
    [CrossRef]
  7. B. Johnsen, O. Mikkelborg, M. Hannevik, L. T. Nilsen, G. Saxebol, and K. G. Blaasaas, "The Norwegian UV-monitoring program," ISSN 0804-4910 (Norwegian Radiation Protection Authority, 2002), http://www.nrpa.no.
  8. A. F. McKinlay and B. L. Diffey, "A reference action spectrum for ultraviolet induced erythema in human skin," CIE J. 6, 17-22 (1987).
  9. G. Seckmeyer, A. F. Bais, G. Bernhard, M. Blumthaler, C. R. Booth, R. L. Lantz, R. L. McKenzie, P. Disterhoft, and A. Webb, "Instruments to measure solar ultraviolet radiation. Part 2: Broadband instruments measuring erythemally weighted solar irradiance," WMO/GAW 164 (World Meteorological Organization, Geneva, 2007).
  10. A. Webb, J. Gröbner, and M. Blumthaler, "A practical guide to operating broadband instruments measuring erythemally weighted irradiance," EUR 22595, ISBN 92-898-0032-1 (Office for Official Publication of the European Communities, 2006).
  11. J. Schreder, J. Gröbner, A. Los, and M. Blumthaler, "Intercomparison of monochromatic source facilities for the determination of the relative spectral response of erythemal broadband filter radiometers," Opt. Lett. 29, 1455-1457 (2004).
    [CrossRef]
  12. 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]
  13. K. O. Lantz, P. Disterhoft, J. J. DeLuisi, E. A. Early, A. Thompson, J. Slusser, and D. Bigelow, "A methodology for deriving clear-sky erythema calibration factors for UVB broadband radiometers of the CUCF," J. Atmos. Ocean. Technol. 16, 1736-1752 (1999).
    [CrossRef]
  14. K. Leszczynski, K. Jokela, L. Ylianttila, R. Visuri, and M. Blumthaler, "Erythemally weighted radiometers in solar UV monitoring: results from the WMO/STUK intercomparison," Photochem. Photobiol. 67, 212-221 (1998).
    [CrossRef]
  15. J. Gröbner, M. Blumthaler, and W. Ambach, "Experimental investigation of spectral global irradiance measurement errors due to a non ideal cosine response," Geophys. Res. Lett. 23, 2493-2496 (1996).
    [CrossRef]
  16. A. F. Bais, S. Kazadzis, D. Balis, C. S. Zerefos, and M. Blumthaler, "Correcting global solar ultraviolet spectra recorded by a Brewer spectroradiometer for its angular response error," Appl. Opt. 37, 6339-6344 (1998).
  17. J. Gröbner et al. are preparing a manuscript to be called "PMOD/WRC-COST calibration and intercomparison of erythemal radiometers."
  18. A. di Sarra, P. Disterhoft, and J. DeLuisi, "On the importance of spectral responsivity of Robertson-Berger-type ultraviolet radiometers for long-term observations," Photochem. Photobiol. 1, 64-72 (2002).
    [CrossRef]

2006 (1)

J. Gröbner, M. Blumthaler, S. Kazadzis, A. Bais, A. Webb, J. Schreder, G. Seckmeyer, and D. Rembges, "Quality assurance of spectral solar UV measurements: results from 25 UV monitoring sites in Europe, 2002 to 2004," Metrologia 43, 66-71 (2006).
[CrossRef]

2005 (2)

2004 (2)

2002 (1)

A. di Sarra, P. Disterhoft, and J. DeLuisi, "On the importance of spectral responsivity of Robertson-Berger-type ultraviolet radiometers for long-term observations," Photochem. Photobiol. 1, 64-72 (2002).
[CrossRef]

1999 (1)

K. O. Lantz, P. Disterhoft, J. J. DeLuisi, E. A. Early, A. Thompson, J. Slusser, and D. Bigelow, "A methodology for deriving clear-sky erythema calibration factors for UVB broadband radiometers of the CUCF," J. Atmos. Ocean. Technol. 16, 1736-1752 (1999).
[CrossRef]

1998 (2)

K. Leszczynski, K. Jokela, L. Ylianttila, R. Visuri, and M. Blumthaler, "Erythemally weighted radiometers in solar UV monitoring: results from the WMO/STUK intercomparison," Photochem. Photobiol. 67, 212-221 (1998).
[CrossRef]

A. F. Bais, S. Kazadzis, D. Balis, C. S. Zerefos, and M. Blumthaler, "Correcting global solar ultraviolet spectra recorded by a Brewer spectroradiometer for its angular response error," Appl. Opt. 37, 6339-6344 (1998).

1996 (1)

J. Gröbner, M. Blumthaler, and W. Ambach, "Experimental investigation of spectral global irradiance measurement errors due to a non ideal cosine response," Geophys. Res. Lett. 23, 2493-2496 (1996).
[CrossRef]

1987 (1)

A. F. McKinlay and B. L. Diffey, "A reference action spectrum for ultraviolet induced erythema in human skin," CIE J. 6, 17-22 (1987).

1921 (1)

C. Dorno, "Dauerregistrierung der Ortshelligkeit von Davos, Oktober 1919 bis Oktober 1920, mittels der photoelektrischen Zellenmethode," Meteorol. Z 1, 1-8 (1921).

Appl. Opt. (2)

CIE J. (1)

A. F. McKinlay and B. L. Diffey, "A reference action spectrum for ultraviolet induced erythema in human skin," CIE J. 6, 17-22 (1987).

Geophys. Res. Lett. (1)

J. Gröbner, M. Blumthaler, and W. Ambach, "Experimental investigation of spectral global irradiance measurement errors due to a non ideal cosine response," Geophys. Res. Lett. 23, 2493-2496 (1996).
[CrossRef]

J. Atmos. Ocean. Technol. (1)

K. O. Lantz, P. Disterhoft, J. J. DeLuisi, E. A. Early, A. Thompson, J. Slusser, and D. Bigelow, "A methodology for deriving clear-sky erythema calibration factors for UVB broadband radiometers of the CUCF," J. Atmos. Ocean. Technol. 16, 1736-1752 (1999).
[CrossRef]

Meteorol. Z (1)

C. Dorno, "Dauerregistrierung der Ortshelligkeit von Davos, Oktober 1919 bis Oktober 1920, mittels der photoelektrischen Zellenmethode," Meteorol. Z 1, 1-8 (1921).

Metrologia (2)

J. Gröbner, M. Blumthaler, S. Kazadzis, A. Bais, A. Webb, J. Schreder, G. Seckmeyer, and D. Rembges, "Quality assurance of spectral solar UV measurements: results from 25 UV monitoring sites in Europe, 2002 to 2004," Metrologia 43, 66-71 (2006).
[CrossRef]

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]

Opt. Lett. (1)

Photochem. Photobiol. (2)

A. di Sarra, P. Disterhoft, and J. DeLuisi, "On the importance of spectral responsivity of Robertson-Berger-type ultraviolet radiometers for long-term observations," Photochem. Photobiol. 1, 64-72 (2002).
[CrossRef]

K. Leszczynski, K. Jokela, L. Ylianttila, R. Visuri, and M. Blumthaler, "Erythemally weighted radiometers in solar UV monitoring: results from the WMO/STUK intercomparison," Photochem. Photobiol. 67, 212-221 (1998).
[CrossRef]

Radiat. Prot. Dosim. (1)

M. Blumthaler, "Quality assurance and quality control methodologies within the Austrian UV monitoring network," Radiat. Prot. Dosim. 111, 359-362 (2004).
[CrossRef]

Other (6)

B. Johnsen, O. Mikkelborg, M. Hannevik, L. T. Nilsen, G. Saxebol, and K. G. Blaasaas, "The Norwegian UV-monitoring program," ISSN 0804-4910 (Norwegian Radiation Protection Authority, 2002), http://www.nrpa.no.

P. Bener, Investigation on the Spectral Intensity of Ultraviolet Sky and Sun + Sky Radiation Under Different Conditions of Cloudless Weather at 1590 m a.s.l., Technical Summary Rep.1 [Contract AF 61(052)-54, 1960].

J. B. Kerr, "Observed dependencies of atmospheric UV radiation and trends," in Solar Ultraviolet Radiation: Modelling, Measurements and Effects, C. S. Zerefos and A. F. Bais, eds. (Berlin, Heidelberg, 1997), pp. 259-266.

G. Seckmeyer, A. F. Bais, G. Bernhard, M. Blumthaler, C. R. Booth, R. L. Lantz, R. L. McKenzie, P. Disterhoft, and A. Webb, "Instruments to measure solar ultraviolet radiation. Part 2: Broadband instruments measuring erythemally weighted solar irradiance," WMO/GAW 164 (World Meteorological Organization, Geneva, 2007).

A. Webb, J. Gröbner, and M. Blumthaler, "A practical guide to operating broadband instruments measuring erythemally weighted irradiance," EUR 22595, ISBN 92-898-0032-1 (Office for Official Publication of the European Communities, 2006).

J. Gröbner et al. are preparing a manuscript to be called "PMOD/WRC-COST calibration and intercomparison of erythemal radiometers."

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