Contactless Ultrasonic Fluid Viscosity and Density Monitoring
Pei-Chi Tsao, Samantha Averitt, Megan Teng, Haoyun Jerry Tang, Ting Chen, Yande Peng, Wei Yue, Liwei Lin · 2025
This work introduces contactless ultrasonic fluid viscosity and density monitoring using piezoelectric micromachined ultrasonic transducers (pMUTs) for the first time. Key advancements include: (1) non-contact and simultaneous liquid viscosity and density measurements; (2) 98% classification accuracy for four tested liquids; and (3) a mean absolute error (MAE) of 0.79 cp for a viscosity range from 0.98 cp to 39.44 cp, and a MAE of 12.6 kg·m⁻3for a density range from 997.8 to 1035.3 kg·m⁻3. By removing the requirement for the direct contract of MEMS sensors to the testing fluid, this approach allows broader liquid measurements, including corrosive or hard-to-clean fluids, without complex experimental setups.