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2011 – Characterisation of SiC photodiodes for high irradiance UV radiometers

von

S. Nowy¹, B. Barton¹, S. Pape¹, P. Sperfeld¹, D. Friedrich¹, S. Winter¹, G. Hopfenmueller², and T. Weiss²,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ²sglux GmbH, Berlin, Germany

Proceedings of NEWRAD2011, edited by S. Park and E. Ikonen. (Aalto University, Espoo, Finland, 2011) p. 203.

Abstract
For monitoring high UV irradiance, silicon carbide (SiC) based photodiodes are used. In this paper we describe the characterization of the novel SiC UV photodiodes in terms of their spectral and integral responsivity. Special attention is paid to the aging behavior of the photodiodes due to high UV irradiance. Artificial aging of the samples is performed by illumination with a high power medium pressure mercury discharge lamp.

2019 – UV degradation anaylsis of SiC and AlGaN based UV photodiodes

von

Dr. Niklas Papathanasiou, sglux GmbH, Berlin, Germany

SiC AlGaN Aging Report

Zusammenfassung
SiC and AlGaN based UV photodiodes had been irradiated by Hg medium pressure lamps for 90 hours and a UV irradiation intensity of 60mW/cm². The SiC photodiodes showed no measurable degradation whereas the AlGaN photodiodes lost 80 % – 85 % of sensitivity.

2020 – UV-Sensoren zur Überwachung der UVC-Oberflächenentkeimung

von

Dr. Tilman Weiss, sglux GmbH, Berlin, Germany

UV-Sensoren zur Überwachung der UVC-Oberflächenentkeimung

Zusammenfassung
Bei der Entkeimung von Oberflächen in Artzpraxen, Krankenzimmern, Apotheken aber auch in der Lebensmittel- und Medikamentenproduktion sowie öffentlich zugänglichen Sanitärbereichen kommt neben chemischen Verfahren auch UVC-Strahlung zum Einsatz. Bei diesen Anwendungen ist die UV-Strahlung entweder am Ort der Erzeugung oder am Wirkort oder an beiden Orten zu erfassen. So kann die zur sicheren Keimabtötung mindestens erforderliche Dosis hinreichend genau ermittelt werden. Der Bericht liefert weitere Details und stellt geeignete Mess-Produkte aus dem sglux-Sortiment vor.

2017 – Degradation of opaque quartz-glass diffusers under high intensity UV irradiation

von

N. Papathanasiou, G. Hopfenmüller, Michael Matalla, T. Weiss,
sglux GmbH, Berlin, Germany

Presentation on IUVA World Congress Spotlights Water Disinfection Technologies 2017, Dubrovnik, Croatia

Abstract
In UV water purification applications UV sensors are monitoring the dosage of UV irradiation as according to ÖNORM and DVGW standards. sglux GmbH is manufacturing such sensors employing opaque synthetic quartz-glass diffusers as entrance windows. This paper investigates the influence of high-intensity UV irradiation on the transmission behavior of these diffusers. Quartz-glass and micro-porous quartz-glass were investigated. The sensors were continuously monitored while irradiated by a 1kW medium pressure Hg lamp with a total UV irradiance of 1000mW/cm² for 800 hours. Before and after the aging period the total transmissions of the diffusers were measured.

2014 – Spectral Irradiance Measurement and Actinic Radiometer Calibration for UV Water Disinfection

von

P. Sperfeld¹, B. Barton¹, S. Pape¹, A. Towara¹, J. Eggers², G. Hopfenmueller³,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), Germany, ²DVGW-Technologiezentrum Wasser, Karlsruhe, Germany, ³sglux GmbH, Berlin, Germany

Proceedings of NEWRAD 2014, edited by S. Park, P. Kaerhae and E. Ikonen. (Aalto University, Espoo, Finland 2014) p. 128.

Abstract
In a joint project, sglux and PTB investigated and developed methods and equipment to measure the spectral and weighted irradiance of high-efficiency UV-C emitters used in water disinfection plants. A calibration facility was set up to calibrate the microbicidal irradiance responsivity of actinic radiometers with respect to the weighted spectral irradiance of specially selected Hg low-pressure and medium-pressure UV radiators. To verify the calibration and to perform on-site tests, spectral measurements have been carried out directly at water disinfection plants in operation. The weighted microbicidal irradiance of the plants was calculated and compared to the measurements of various actinic radiometers.

2013 – Developing and setting up a calibration facility for UV sensors at high irradiance rates

von

B. Barton¹, P. Sperfeld¹, A. Towara¹, G. Hopfenmueller²,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ²sglux GmbH, Berlin, Germany

EMEA Regional Conference, Karlsruhe, Germany (2013)

Abstract
PTB provides spectral irradiance calibrations traceable to national primary standards and the SI system. A transfer standard source for high UV irradiances has been constructed and characterized. A medium pressure Hg lamp and a low pressure Hg lamp provide different spectra at different irradiance levels. The system might serve as a calibration facility for DVGW & ÖNORM conform UV sensors. Calibration by direct substitution to reference sensors can be carried out.

2013 – PTB traceable calibrated reference UV radiometer for measurements at high irradiance medium pressure mercury discharge lamps

von

G. Hopfenmueller¹, T.Weiss¹, B. Barton², P. Sperfeld², S. Nowy², S. Pape², D. Friedrich², S. Winter², A. Towara², A. Hoepe², S. Teichert²,
¹sglux GmbH, Berlin, Germany, ²Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany

EMEA Regional Conference, Karlsruhe, Germany (2013)

2013 – Traceable spectral irradiance measurements at UV water disinfection plants

von

P. Sperfeld¹, B. Barton¹, S. Pape¹, G. Hopfenmueller²,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ²sglux GmbH, Berlin, Germany

EMEA Regional Conference, Karlsruhe, Germany (2013)

Abstract
PTB provides spectral irradiance calibrations traceable to national primary standards and the SI system. Transportable spectroradiometer systems have been adapted for high UV irradiance measurements. Successful measurements at medium pressure Hg and low pressure Hg lamp facilities have been carried out. The effective microbicidal irradiances agree within 15%. 40° sensor geometry could be developed. Discussion about calibration service and support.

2011 – Characterisation of new optical diffusers used in high irradiance UV radiometers

von

Barton¹, B., Sperfeld¹, P., Nowy¹, S., Towara¹, A., Hoepe¹, A., Teichert¹, S., Hopfenmueller², G., Baer³, M. and Kreuzberger³, T.
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ²sglux GmbH, Berlin, Germany, ³SGIL Silicaglas GmbH, Langewiesen, Germany

Proceedings of NEWRAD2011, edited by S. Park and E. Ikonen. (Aalto University, Espoo, Finland, 2011) p. 278.

Abstract
Diffusers are essential components of UV radiometers used as transfer standards. They improve the insensitivity to differing radiation situations. In combination with a beam limiting aperture, a diffuser defines the irradiated area [1]. A detailed study of different properties of UV diffusers is shown.