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The Optimization of a Photoacoustic Refrigerant Sensor System Using a Three-Chamber Concept

: El-Safoury, Mahmoud; Weber, Christian; Wöllenstein, Jürgen; Kiesewetter, Olaf

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SMSI 2020 - Sensor and Measurement Science International : Proceedings, 22-25 June 2020, Nuremberg, Germany, SMSI 2020 is cancelled due to COVID-19
Wunstorf: AMA Service, 2020
ISBN: 978-3-9819376-2-6
ISBN: 978-3-9819376-3-3
ISBN: 3-9819376-3-5
Conference "Sensor and Measurement Science International" (SMSI) <2020, Nuremberg/cancelled>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
Photoacoustic Detector; Photometer; Refrigerants; R1234yf; R134a

Ever since the ban of the refrigerant R134a in 2017 for all newly manufactured vehicles, due to its high global warming potential, the necessity of low-cost, reliable and precise refrigerant measuring devices has arisen. We present a photoacoustic gas detector for the refrigerants R134a and the environmentally friendly alternative R1234yf. The sensor consists of a detection, an absorption and a filter chamber. The influence of the filter chamber length on the sensor signal was evaluated and a signal drift, originating from filter chamber leakage, was successfully eliminated and validated by FTIR measurements.