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2023-2025 – Development of a SiC-Avalanche-Photodiode

von

Partner: Fraunhofer IISB, Erlangen
period: 2023 – 2025
acknowledgements: FZK02P22K030

Abstract
Development of a SiC-Avalanche-Photodiode for flame and fire detection
Fraunhofer IISB and sglux GmbH have started working on the development of a manufacturing process for a SiC-based avalanche photodiode (APD) as part of the “KMU-innovativ” project. An APD amplifies the photocurrent through the avalanche effect and therefore has a significantly higher sensitivity than a conventional SiC photodiode. Applications are in the area of flame and fire detection.
Successful completion of the project would create an interesting alternative to the gas discharge tubes currently in use. Although these tubes are capable of reliably detecting very low levels of UV radiation, they have disadvantages that are not found in semiconductor-based UV detectors: The gas discharge tubes are relatively large, fragile, require a high operating voltage and have a short service life.
The first prototypes of the novel SiC APD will be available in mid 2024.

2025 – Flame monitoring in industrial burners with semiconductor-based UV sensors focusing on hydrogen-flame

von

Dr. Tilman Weiss, sglux GmbH, Berlin, Germany
Yuyu Kimura, IR System Co., Ltd., Tokyo, Japan

This article was first published in the Japanese Journal of Industrial Heating 2025, vol. 62, no. 3, Edition May
Flame monitoring in industrial burners with semiconductor-based UV sensors focusing on hydrogen-flame

Abstrait
Using semiconductor based sensors for flame detection, such as presented with this article can be regarded as a fascinating approach not just with regards on costs and safety. Additionally, looking at environmental and sustainability aspects using semiconductor sensors instead of discharge tubes is a useful tool towards durability and longevity. The possibility of working with two different sensor chips for two different kind of irradiadion (UV and IR) in one small size sensor housing opens up a multitude of new and interesting application possibilities.

2021 – TOCONs with reduced dead times used for the detection of fire and combustion burner flames

von

Dr. Tilman Weiss, sglux GmbH, Berlin, Germany

TOCONs for the detection of fire and combustion burner flames

Abstract
The standard sglux TOCONs are featured by a relatively high time constant that extends from 30 ms (low sensitivity TOCONs) until 80 ms (high sensitivity TOCONs). Most of the TOCON applications benefit from this high time constant because usually the TOCON’s application is to measure a UV irradiation that slowly changes. Such applications are e.g. the control of UV disinfection and UV curing sources. Short changes of signal caused by electromagnetic or high frequency influences are averaged – which is a benefit. However, looking at flame detection in heaters or looking at fire detection applications this relatively high time constant may cause problems. The present report presents opportunities to reduce the dead time of the TOCONs.