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Portable device for characterizing the angular response of UV spectroradiometers
Alkiviadis F Bais1, Stylianos Kazadzis, Katerina Garane
1Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Campus Box 149, 54124 Thessaloniki, Greece.
Applied Optics
|December 2, 2005
Summary
A new device accurately measures the field angular response of UV spectroradiometers, including operational effects. This ensures more reliable UV irradiance measurements across European stations.
Area of Science:
- Atmospheric science
- Radiometry
- Ultraviolet (UV) radiation measurement
Background:
- Accurate measurement of UV spectroradiometers is crucial for atmospheric research.
- The angular response of spectroradiometers affects the accuracy of diffuse irradiance measurements.
- Existing methods may not fully capture operational conditions.
Purpose of the Study:
- To develop and validate a device for measuring the in-situ angular response of UV spectroradiometers.
- To assess the impact of operational factors on the angular response.
- To quantify uncertainties in angular response measurements.
Main Methods:
- Design and characterization of a novel field device for angular response measurement.
- Application of the device to 11 UV spectroradiometers at European UV stations.
- Identification and quantification of uncertainty sources.
Main Results:
- The device accurately captures the operational angular response, including diffuser leveling effects.
- Uncertainties in angular response measurements range from 1.5% to 10% depending on incidence angle and diffuser.
- Errors in diffuse irradiance reporting for the tested instruments varied from 2% to -13%.
Conclusions:
- The developed device provides a reliable method for assessing spectroradiometer angular response in field conditions.
- Understanding and correcting for angular response is essential for accurate UV irradiance data.
- The study highlights variability in spectroradiometer performance and its impact on UV measurements.