Continuous monitoring of the dynamic viscosity of bitumen with piezoelectric MEMS sensors
Konferenz: MikroSystemTechnik Kongress 2023 - Kongress
23.10.2023-25.10.2023 in Dresden, Deutschland
Tagungsband: MikroSystemTechnik Kongress 2023
Seiten: 4Sprache: EnglischTyp: PDF
Autoren:
Alasatri, S. (Christian Doppler Laboratory for Chemo-Mechanical Analysis of Bituminous materials, Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria & Institute of Sensor and Actuator Systems, TU Wien, Vienna, Austria)
Schneider, M.; Schmid, U. (Institute of Sensor and Actuator Systems, TU Wien, Vienna, Austria)
Mirwald, J.; Hofko, B. (Christian Doppler Laboratory for Chemo-Mechanical Analysis of Bituminous materials, Institute of Transportation, Vienna University of Technology, Vienna, Austria & Institute of Transportation, TU Wien, Vienna, Austria)
Inhalt:
This work demonstrates lab-scale continuous monitoring of the dynamic viscosity of bitumen with piezoelectric MEMS sensors over 120 h at an accelerated aging temperature of 100 °C in air. For actuation and sensing, piezoelectric aluminium nitride (AlN) is used in combination with a strip-like electrode design. The AlN-based MEMS resonator is fabricated and excited in a 10th order (1B) roof-tile shaped vibrational mode to provide high signal-to-noise ratio and thereby to achieve high quality factors while immersed in bitumen. The MEMS resonator enabled continuous tracking of the dynamic viscosity of bitumen for 5 days with measured values of up to 10.000 mPa·s in the bitumen ageing process at 100 °C. The results from this work demonstrate the robustness of the MEMS sensor as the latter device is capable to perform continuous measurements at elevated temperatures for a long time even in harsh environments like bitumen.