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Proceedings Article

Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments

[+] Author Affiliations
Susana B. Diaz

CADIC/CONICET (Argentina)

Charles R. Booth

Biospherical Instruments Inc. (USA)

Roy Armstrong

Univ. de Puerto Rico (USA)

Sergio Cabrera, Humberto Fuenzalida

Univ. de Chile (Chile)

Claudio Cassiccia

Univ. de Magallanes (Chile)

Charlotte Lovengreen

Univ. Austral de Chile (Chile)

Alejandro Paladini

INGEBI/CONICET (Argentina)

Jorge Pedroni, A. Rosales

Univ. Nacional de la Patagonia San Juan Bosco (Argentina)

Horacio Zagarese

Univ. Nacional del Comahue (Argentina)

Claudio Brunat, Carolina Camilion

CADIC/IAI (Argentina)

Guillermo Deferrari

CADIC/NSF (Argentina)

Maria Vernet

Scripps Institution of Oceanography (USA)

Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, 106 (June 26, 2003); doi:10.1117/12.466122
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From Conference Volume 4896

  • Ultraviolet Ground- and Space-based Measurements, Models, and Effects II
  • Wei Gao; Jay R. Herman; Guangyu Shi; Kazuo Shibasaki; James R. Slusser
  • Hangzhou, China | October 23, 2002

abstract

The IAI Network for the measurement of ultraviolet radiation in Chile, Argentina and Puerto Rico is composed of ten multi-channel radiometers (GUV 511, Bisopherical Instruments Inc.), which are periodically sun calibrated with a traveling reference GUV (RGUV). The RGUV is calibrated under solar light against a SUV100 spectroradiometer. This calibration is then transferred to each instrument in the network through the RGUV. A previous multi-regression model proved to be suitable to derive narrowband irradiance from broadband irradiance, ozone column and solar zenith angles (SZA). A recent modification of the existing multi-regression model improved the multi-channel instrument sun calibration against spectroradiometers. In this approach, the narrowband irradiance is the SUV spectral irradiance and the broadband is the multi-channel GUV irradiance. We included the azimuth angle as a parameter into the multi-regression equation and we applied a non-linear function, instead of a single coefficient, to correct for SZA. In this paper, the new multi-regression approach is applied to both steps of a GUV calibration: SUV - RGUV and RGUV - GUV and the results are compared with traditional calibration methods. Important improvements are observed in the calibration, in particular for SZA larger than 50°.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Susana B. Diaz ; Charles R. Booth ; Roy Armstrong ; Sergio Cabrera ; Claudio Cassiccia, et al.
"Calibration improvement of the IAI Network for the measurement of UVR: multichannel instruments", Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, 106 (June 26, 2003); doi:10.1117/12.466122; http://dx.doi.org/10.1117/12.466122


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