Calibration and maintenance of standards for spectral UV measurement

Informacje na temat projektu

Identyfikator umowy o grant: EV5V0353

Projekt został zamknięty

Data rozpoczęcia 1 Stycznia 1994

Data zakończenia 31 Marca 1996

Finansowanie w ramach

• Specific research and technological development programme (EEC) in the field of the environment, 1990-1994

Koszt całkowity

Brak danych

Wkład UE

Brak danych

Koordynowany przez

UNIVERSITY OF READING
United Kingdom

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Publikacje

Other (1)

Advances in solar ultraviolet spectroradiometry: Air pollution research report 63

Autorzy: WEBB A R (EDITOR) (Department of Physics, UMIST, Manchester (GB))
Opublikowane w: EUR 17768 EN (1997) 238pp., FS, free of charge, 1997, Strona(/y) 238, ISBN 92-828-0990-0

Wyniki nadające się do wykorzystania

Assessment of ultraviolet spectroradiometers

The performances of various ultraviolet spectroradiometers were assessed and compared as a series of intercomparison campaigns (1991-1995). Recommendations for further improvements were made. Five international intercomparison campaigns for solar UV spectroradiometers have been held in Europe, 4 in the field and 1 in the laboratory. The number of participating instruments increased from 6 in 1991 to 13 in 1995. Vast improvements in instrument performance, calibration procedures, intercomparison techniques and understanding of the requirements for good UV measurements have been made. The results of the intercomparisons have been published. A variety of special instruments are used for solar UV measurements, ranging from the full commercial design (Brewer spectrophotometer) to the modified commercial unit (Bentham (UK) or Optronic (US) instrument based) to custom built designs. The instrument secifications for spectral solar UV measurements are stringent. If these are met, and the equipment demonstrates good stability, then agreement between different instruments depends upon calibration and operational procedures. Advances in these procedures have reduced discrepancies between a subset of instruments to small identifiable errors (below 3%) due to differences in absolute calibration standards available from the different National Standards Laboratories, and to nonideal cosine responses of the input optics. These two problems must be addressed if furthur advances are to be made.