Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm

Beat Schmid, Paul R. Spyak, Stuart F. Biggar, Christoph Wehrli, Jörg Sekler, Stuart F Biggar, Christian Mätzler, Niklaus Kämpfer

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Over a period of 3 years a precision Sun photometer (SPM) operating between 300 and 1025 nm was calibrated four times at three different high-mountain sites in Switzerland, Germany, and the United States by means of the Langley-plot technique. We found that for atmospheric window wavelengths the total error (2σ-statistical plus systematic errors) of the calibration constants V0 (λ), the SPM voltage in the absence of any attenuating atmosphere, can be kept below 1.6% in the UV-A and blue, 0.9% in the mid-visible, and 0.6% in the near-infrared spectral region. For SPM channels within strong water-vapor or ozone absorption bands a modified Langley-plot technique was used to determine V0 (λ) with a lower accuracy. Within the same period of time, we calibrated the SPM five times using irradiance standard lamps in the optical labs of the Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center, Switzerland, and of the Remote Sensing Group of the Optical Sciences Center, University of Arizona, Tucson, Arizona. The lab calibration method requires knowledge of the extraterrestrial spectral irradiance. When we refer the standard lamp results to the World Radiation Center extraterrestrial solar irradiance spectrum, they agree with the Langley results within 2% at 6 of 13 SPM wavelengths. The largest disagreement (4.4%) is found for the channel centered at 610 nm. The results of these intercomparisons change significantly when the lamp results are referred to two different extraterrestrial solar irradiance spectra that have become recently available.

Original languageEnglish (US)
Pages (from-to)3923-3941
Number of pages19
JournalApplied Optics
Volume37
Issue number18
StatePublished - 1998

Fingerprint

Photometers
Electric lamps
Sun
luminaires
photometers
sun
irradiance
Calibration
evaluation
Switzerland
plots
atmospheric windows
Radiation
Wavelength
Systematic errors
radiation
Germany
mountains
wavelengths
systematic errors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Schmid, B., Spyak, P. R., Biggar, S. F., Wehrli, C., Sekler, J., Biggar, S. F., ... Kämpfer, N. (1998). Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm. Applied Optics, 37(18), 3923-3941.

Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm. / Schmid, Beat; Spyak, Paul R.; Biggar, Stuart F.; Wehrli, Christoph; Sekler, Jörg; Biggar, Stuart F; Mätzler, Christian; Kämpfer, Niklaus.

In: Applied Optics, Vol. 37, No. 18, 1998, p. 3923-3941.

Research output: Contribution to journalArticle

Schmid, B, Spyak, PR, Biggar, SF, Wehrli, C, Sekler, J, Biggar, SF, Mätzler, C & Kämpfer, N 1998, 'Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm', Applied Optics, vol. 37, no. 18, pp. 3923-3941.
Schmid, Beat ; Spyak, Paul R. ; Biggar, Stuart F. ; Wehrli, Christoph ; Sekler, Jörg ; Biggar, Stuart F ; Mätzler, Christian ; Kämpfer, Niklaus. / Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm. In: Applied Optics. 1998 ; Vol. 37, No. 18. pp. 3923-3941.
@article{e5d31390b64c41a2bdf53650eca321c2,
title = "Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm",
abstract = "Over a period of 3 years a precision Sun photometer (SPM) operating between 300 and 1025 nm was calibrated four times at three different high-mountain sites in Switzerland, Germany, and the United States by means of the Langley-plot technique. We found that for atmospheric window wavelengths the total error (2σ-statistical plus systematic errors) of the calibration constants V0 (λ), the SPM voltage in the absence of any attenuating atmosphere, can be kept below 1.6{\%} in the UV-A and blue, 0.9{\%} in the mid-visible, and 0.6{\%} in the near-infrared spectral region. For SPM channels within strong water-vapor or ozone absorption bands a modified Langley-plot technique was used to determine V0 (λ) with a lower accuracy. Within the same period of time, we calibrated the SPM five times using irradiance standard lamps in the optical labs of the Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center, Switzerland, and of the Remote Sensing Group of the Optical Sciences Center, University of Arizona, Tucson, Arizona. The lab calibration method requires knowledge of the extraterrestrial spectral irradiance. When we refer the standard lamp results to the World Radiation Center extraterrestrial solar irradiance spectrum, they agree with the Langley results within 2{\%} at 6 of 13 SPM wavelengths. The largest disagreement (4.4{\%}) is found for the channel centered at 610 nm. The results of these intercomparisons change significantly when the lamp results are referred to two different extraterrestrial solar irradiance spectra that have become recently available.",
author = "Beat Schmid and Spyak, {Paul R.} and Biggar, {Stuart F.} and Christoph Wehrli and J{\"o}rg Sekler and Biggar, {Stuart F} and Christian M{\"a}tzler and Niklaus K{\"a}mpfer",
year = "1998",
language = "English (US)",
volume = "37",
pages = "3923--3941",
journal = "Applied Optics",
issn = "1559-128X",
publisher = "The Optical Society",
number = "18",

}

TY - JOUR

T1 - Evaluation of the applicability of solar and lamp radiometric calibrations of a precision Sun photometer operating between 300 and 1025 nm

AU - Schmid, Beat

AU - Spyak, Paul R.

AU - Biggar, Stuart F.

AU - Wehrli, Christoph

AU - Sekler, Jörg

AU - Biggar, Stuart F

AU - Mätzler, Christian

AU - Kämpfer, Niklaus

PY - 1998

Y1 - 1998

N2 - Over a period of 3 years a precision Sun photometer (SPM) operating between 300 and 1025 nm was calibrated four times at three different high-mountain sites in Switzerland, Germany, and the United States by means of the Langley-plot technique. We found that for atmospheric window wavelengths the total error (2σ-statistical plus systematic errors) of the calibration constants V0 (λ), the SPM voltage in the absence of any attenuating atmosphere, can be kept below 1.6% in the UV-A and blue, 0.9% in the mid-visible, and 0.6% in the near-infrared spectral region. For SPM channels within strong water-vapor or ozone absorption bands a modified Langley-plot technique was used to determine V0 (λ) with a lower accuracy. Within the same period of time, we calibrated the SPM five times using irradiance standard lamps in the optical labs of the Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center, Switzerland, and of the Remote Sensing Group of the Optical Sciences Center, University of Arizona, Tucson, Arizona. The lab calibration method requires knowledge of the extraterrestrial spectral irradiance. When we refer the standard lamp results to the World Radiation Center extraterrestrial solar irradiance spectrum, they agree with the Langley results within 2% at 6 of 13 SPM wavelengths. The largest disagreement (4.4%) is found for the channel centered at 610 nm. The results of these intercomparisons change significantly when the lamp results are referred to two different extraterrestrial solar irradiance spectra that have become recently available.

AB - Over a period of 3 years a precision Sun photometer (SPM) operating between 300 and 1025 nm was calibrated four times at three different high-mountain sites in Switzerland, Germany, and the United States by means of the Langley-plot technique. We found that for atmospheric window wavelengths the total error (2σ-statistical plus systematic errors) of the calibration constants V0 (λ), the SPM voltage in the absence of any attenuating atmosphere, can be kept below 1.6% in the UV-A and blue, 0.9% in the mid-visible, and 0.6% in the near-infrared spectral region. For SPM channels within strong water-vapor or ozone absorption bands a modified Langley-plot technique was used to determine V0 (λ) with a lower accuracy. Within the same period of time, we calibrated the SPM five times using irradiance standard lamps in the optical labs of the Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center, Switzerland, and of the Remote Sensing Group of the Optical Sciences Center, University of Arizona, Tucson, Arizona. The lab calibration method requires knowledge of the extraterrestrial spectral irradiance. When we refer the standard lamp results to the World Radiation Center extraterrestrial solar irradiance spectrum, they agree with the Langley results within 2% at 6 of 13 SPM wavelengths. The largest disagreement (4.4%) is found for the channel centered at 610 nm. The results of these intercomparisons change significantly when the lamp results are referred to two different extraterrestrial solar irradiance spectra that have become recently available.

UR - http://www.scopus.com/inward/record.url?scp=0000782841&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000782841&partnerID=8YFLogxK

M3 - Article

C2 - 18273360

AN - SCOPUS:0000782841

VL - 37

SP - 3923

EP - 3941

JO - Applied Optics

JF - Applied Optics

SN - 1559-128X

IS - 18

ER -