Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9914457k&link_type=abstract
Technical Report, KNMI-TR-203
Other
Calibrating, Errors, Ultraviolet Spectrophotometers, Ozone, Greece, Stability, Sun, Spectra, Slits, Scanners, Netherlands, Luminaires, Installing
Scientific paper
In Nea Michaniona, Thessaloniki, Greece, in July 1997 an instrument intercomparison for UV spectrophotometers funded by the EU (SUSPEN) was held. KNMI participated with Brewer #100, and the results of this campaign are discussed in this report. Additionally, in August 1997 Brewer #100 received a new ozone calibration in De Bilt, The Netherlands and various measurements were performed in order to improve the wavelength calibrations for UV scans. This has led to the following. In general, Brewer #100 has proven to be a good, reliable and stable instrument over the period of 4 years that it is in use at KNMI now. In Thessaloniki it was in 'the reference' on both 'blind days', indicating that it performed well compared to the other instruments. The ozone calibration has changed by approximately 1% since the installation of Brewer #100 in January 1994. New ETC's are implemented in the Brewer software: 1760/155 and 0.35/1.1707, replacing the old numbers 1754.5/155 and 0.3472/ 1.1707. The direct sun ozone measurements performed since August 1995 should be reprocessed with the new ETC's because lamp measurements, that are performed frequently to monitor the Brewer calibration, indicate that since that time the calibration has changed. The Brewer wavelength calibration for UV scans contained several problems. Near the slit change, errors up to approx. 0.25 mn were found. Based on the analysis of numerous measurements on spectral lamps, 2 important changes has been carried out to improve the wavelength calibration: (1) change from slit 1 to slit 5 during a scan at 335 nm in stead of the old 353 nm, (2) implement the newly derived dispersion constants for all slits, but most, and (3) important for slit 1 and 5 (the other slits are not used for UV scans).
Kuik Foeke
Wauben Wiel
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