Article Impact Level: HIGH Data Quality: STRONG Summary of University of Missouri https://doi.org/10.1115/1.4068392 Dr. Nilesh Salvi et al.
Points
- The method developed uses continuous-wave ultrasound echoed between two piezoelectric transducers to achieve a strong signal-to-noise ratio for accurate viscosity sensing.
- An optimization algorithm solves the inverse problem by tuning a compound wave model’s parameters to extract the precise medium viscosity, enhancing the robustness of the measurement.
- The new technique demonstrated an impressive measurement precision and a high correlation coefficient with standard instruments, exceeding a high benchmark.
- Measurements taken at room temperature were highly accurate across a broad viscosity range, validating its performance over common industrial fluid viscosities.
- This new methodology allows for continuous, in situ viscosity measurement using simple, rugged hardware, showing improved accuracy over another acoustic method in the high viscosity range.
Summary
The presented research details a novel model-based method for in situ viscosity measurement utilizing continuous-wave (CW) ultrasound, which capitalizes on the strong signal-to-noise ratio inherent in the continuous signal echoed through a medium between two piezoelectric transducers. An inverse problem was addressed through the development of an optimization algorithm designed to extract the medium viscosity by precisely fitting the parameters of a model representing the sensed compound wave. Algorithmic convergence was enhanced through the implementation of numerical constraints and specific parameter initialization techniques, contributing to the robustness of the automated measurement approach.
Validation of this new measurement method was conducted across various materials, including different lubricants at controlled temperatures, with a comparison made against standard viscometers. The resulting technique demonstrated a high level of precision, recorded at less than a certain low percentage, and a strong linear correlation coefficient $(r)$ with standard reference instruments, exceeding a high threshold. Room temperature measurements, across a broad range of viscosities, achieved a high degree of accuracy, which indicates reliable performance over common fluid types.
Significantly, the model-based CW ultrasound methodology demonstrated an advantage in accuracy when compared to another acoustic method specifically for high viscosity measurements, a regime where existing acoustic techniques often struggle. This methodology facilitates the continuous, in situ measurement of viscosity using simple and rugged hardware, making it highly suitable for applications requiring real-time process monitoring and control across numerous industrial sectors, including pharmaceuticals and food processing.
Link to the article: https://asmedigitalcollection.asme.org/dynamicsystems/article-abstract/147/5/051007/1214793/A-Model-Based-Method-for-In-Situ-Viscosity?redirectedFrom=fulltext
References
Salvi, N., & Tan, J. (2025). A model-based method for in situ viscosity measurement with continuous-wave ultrasound. Journal of Dynamic Systems, Measurement, and Control, 147(5), 051007. https://doi.org/10.1115/1.4068392
