I'm glad you mentioned the slides I presented at the ECUVM Conference in Vienna. For those interested, here are some additional details: The comparison measurements were conducted on July 27, 2017, at 11:54 AM UTC at measurement platform of the German Federal Office for Radiation Protection in Munich Neuherberg (48°13'16'' (48.221°) North; 11°35'24'' (11.590°) East; 495 m above sea level). The double monochromator is a DTM300 from Bentham. The BTS is a BTW2048UV-WP from Gigahertz.
The BTS devices have been used in the German solar UV monitoring network since around 2016/2017. Currently, BTS2048 devices are in use at 8 out of 14 spectral measurement stations in Germany. Additionally, at four locations in Germany, direct-measuring BTS2048 devices are installed on a sun tracker with solar tracking. At sunshine, we can use these to determine the total ozone column (TOC) and aerosol optical depth with good temporal resolution. The German Weather Service also operates its BTS direct-measuring devices alongside Brewer instruments and notes a good alignment of TOC values (particularly above a certain solar elevations, even very good).
Last year, solar comparison measurements were carried out with three BTS2048 devices and the QASUME reference spectral radiometer from the WMO World Radiation Center (double monochromator) at the measurement network center of the Federal Office for Radiation Protection in Munich (audit report see https://www.pmodwrc.ch/wcc_uv/qasume_audit/reports/2024_06_Germany_Neuherberg.pdf).
Despite the partly cloudy weather and the different measurement principles, it was confirmed once again that the BTS2048 devices used in the measurement network achieve good results (see page 3 of the report) and can measure comparably well to other devices like Brewer or double monochromators that are compared in QASUME audits (https://www.pmodwrc.ch/en/world-radiation-center-2/wcc-uv/qasume-site-audits/).
Perhaps, when I/we have some time, we could discuss some of the application differences between double monochromators and BTS systems in solar UV measurement at UV & YOU. For example, there are differences in (self) calibration options, calibration accuracy, and the required cleaning of ventilation grids, among other aspects.
I'm glad you mentioned the slides I presented at the ECUVM Conference in Vienna. For those interested, here are some additional details: The comparison measurements were conducted on July 27, 2017, at 11:54 AM UTC at measurement platform of the German Federal Office for Radiation Protection in Munich Neuherberg (48°13'16'' (48.221°) North; 11°35'24'' (11.590°) East; 495 m above sea level). The double monochromator is a DTM300 from Bentham. The BTS is a BTW2048UV-WP from Gigahertz.
The BTS devices have been used in the German solar UV monitoring network since around 2016/2017. Currently, BTS2048 devices are in use at 8 out of 14 spectral measurement stations in Germany. Additionally, at four locations in Germany, direct-measuring BTS2048 devices are installed on a sun tracker with solar tracking. At sunshine, we can use these to determine the total ozone column (TOC) and aerosol optical depth with good temporal resolution. The German Weather Service also operates its BTS direct-measuring devices alongside Brewer instruments and notes a good alignment of TOC values (particularly above a certain solar elevations, even very good).
Last year, solar comparison measurements were carried out with three BTS2048 devices and the QASUME reference spectral radiometer from the WMO World Radiation Center (double monochromator) at the measurement network center of the Federal Office for Radiation Protection in Munich (audit report see https://www.pmodwrc.ch/wcc_uv/qasume_audit/reports/2024_06_Germany_Neuherberg.pdf).
Despite the partly cloudy weather and the different measurement principles, it was confirmed once again that the BTS2048 devices used in the measurement network achieve good results (see page 3 of the report) and can measure comparably well to other devices like Brewer or double monochromators that are compared in QASUME audits (https://www.pmodwrc.ch/en/world-radiation-center-2/wcc-uv/qasume-site-audits/).
Perhaps, when I/we have some time, we could discuss some of the application differences between double monochromators and BTS systems in solar UV measurement at UV & YOU. For example, there are differences in (self) calibration options, calibration accuracy, and the required cleaning of ventilation grids, among other aspects.
Thanks Sebastian
Nice to have all this discussion available in one place.
Richard