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Ultrasonic measurement of viscosity: Signal processing methodologies
Ediguer E Franco1, Flávio Buiochi2
1Engineering Faculty, Universidad Autónoma de Occidente, Cali, Valle del Cauca, Colombia.
Ultrasonics
|August 21, 2018
Summary
This study introduces improved ultrasonic shear-wave reflectance methods for liquid viscosity measurement. Analyzing a frequency band enhances accuracy and precision over single-frequency calculations, crucial for reliable viscosity data.
Area of Science:
- Materials Science
- Acoustics
- Physical Chemistry
Background:
- The ultrasonic shear-wave reflectance method measures liquid viscosity via energy transference at a solid-liquid interface.
- Conventional viscometry is the standard, but ultrasonic methods offer non-contact measurement potential.
- Shear-wave generation using mode conversion was employed in a specialized measurement cell.
Purpose of the Study:
- To address inaccuracies in single-frequency ultrasonic viscosity measurements.
- To develop and analyze alternative post-processing methodologies for ultrasonic shear-wave reflectance data.
- To compare ultrasonic viscosity measurements with conventional viscometry across a wide range of liquids.
Main Methods:
- Utilized a measurement cell with mode conversion for shear wave generation.
- Tested five different liquid substances spanning three orders of magnitude in viscosity.
- Compared ultrasonic results with conventional rotational viscometry.
- Analyzed two alternative data post-processing methodologies operating over a frequency band.
Main Results:
- All tested liquids exhibited Newtonian behavior at working frequencies, confirmed by consistent ultrasonic and rotational viscometer results.
- Single-frequency viscosity calculations showed significant errors due to oscillating behavior across the transducer's frequency band.
- The developed alternative methodologies, utilizing a frequency band, demonstrated improved accuracy and precision.
Conclusions:
- Alternative post-processing methodologies analyzing the reflection coefficient over a frequency band significantly enhance the accuracy and precision of ultrasonic viscosity measurements.
- The ultrasonic shear-wave reflectance method, when properly post-processed, provides reliable viscosity data comparable to conventional methods.
- Addressing frequency-dependent oscillations is key to overcoming limitations in ultrasonic liquid viscosity determination.
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