Articles | Volume 10, issue 1
Regular research article
27 Jan 2021
Regular research article |  | 27 Jan 2021

Inline quality monitoring of diesel exhaust fluid (AdBlue) by using the 3ω method

Ralf E. Bernhardsgrütter, Christoph J. Hepp, Martin Jägle, Hans-Fridtjof Pernau, Katrin Schmitt, and Jürgen Wöllenstein

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Cited articles

BASF – The Chemical Company: AdBlue® Technical Leaflet, 1–6, available at: (last access: 20 September 2020), 2006. a, b
Cahill, D. G.: Thermal conductivity measurement from 30 to 750 K: The 3ω method, Rev. Sci. Instrum., 61, 802–808,, 1990. a, b
Care, E.: CRC Handbook of Chemistry and Physics, 2009–2010, 90th ed., edited by: Lide, D. R. and Haynes, W. M., CRC Press, Boca Raton, Florida, USA, vol. 131,, 2009. a, b
Clausen, C., Pedersen, T., and Bentien, A.: The 3-omega method for the measurement of fouling thickness, the liquid flow rate, and surface contact, Sensors, 17, 552,, 2017. a, b
de Beeck, J. O., Thompson, J., and Booth, N.: Upcoming Emission Regulations for Passenger Cars: Impact on SCR System Requirements and Developments, SAE 2013 World Congress & Exhibition, SAE International, Detroit, USA, 16–18 April 2013,, 2013. a
Short summary
The selective catalytic reduction, an after-treatment method using diesel exhaust fluid (AdBlue), is needed to reduce the emissions of diesel combustion processes. It is crucial to monitor the diesel exhaust fluid. This article presents a platinum thin-film sensor using the 3-omega method to characterize the diesel exhaust fluid. The information about the concentration of urea in water can be extracted. The results show that this sensor can determine the urea content to within 1 % by weight.