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Advanced white cell design for investigation of ethylene using a nondispersive infrared photometer

: Eberhardt, André; Ulmer, Ulrich; Schmitt, Katrin; Wöllenstein, Jürgen

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AMA Service GmbH, Wunstorf:
AMA Conferences 2017. Proceedings : Nuremberg Exhibition Centre, Germany, 30.5.-1.6.2017; Proceedings; SENSOR 2017, 18th International Conference on Sensors and Measurement Technology, IRS² 2017, 15th International Conference on Infrared Sensors & Systems; CD-ROM
Wunstorf: AMA Service, 2017
ISBN: 978-3-9816876-4-4
International Conference on Sensors and Measurement Technology (SENSOR) <18, 2017, Nuremberg>
International Conference on Infrared Sensors & Systems (IRS2) <15, 2017, Nuremberg>
Conference Paper, Electronic Publication
Fraunhofer IPM ()
ethylene; climacteric fruit; spectroscopy; NDIR photometer; optical long path cell

Ethylene (C2H4) is an important marker in the ripening process of climacteric fruit and is present down to ppb concentrations. Nondispersive infrared (NDIR) sensors are suitable for the selective detection of ethylene, provided they can reach better sensitivities. This can be achieved by increasing the optical path length, e.g. using long path cells. We present an advanced White cell design, which was optimized for implementation in NDIR sensors. The design offers an optical path of 4 m, an entrance aperture of up to 5x5 mm2 and a numerical aperture of 0.126. The implementation of the cell in a photometer setup for ethylene yielded a noise equivalent concentration of 860 ppb (1 σ) C2H4 in nitrogen (N2).