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Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions
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Design of an Integrated Micro-Viscometer for Monitoring Engine Oil.

Roufaida Bensalem1, Animesh Saha Shovan1, Juan Morency Trudel1

  • 1Electrical and Computer Engineering Department, McGill University, Montreal, QC H3A 0E9, Canada.

Sensors (Basel, Switzerland)
|July 27, 2022
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Summary
This summary is machine-generated.

This study introduces an integrated micro-viscometer using a capacitive micromachined ultrasonic transducer (CMUT) and application-specific integrated circuit (ASIC) for engine oil monitoring. The device accurately measures engine oil viscosity changes, enabling condition monitoring for economic and environmental benefits.

Keywords:
ASICCMUTMEMScharge pumpoil conditionsensorsviscometer

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Area of Science:

  • Micro-electromechanical systems (MEMS)
  • Acoustic sensing technologies
  • Tribology and lubrication engineering

Background:

  • Engine oil degradation impacts performance and longevity.
  • Traditional oil viscosity monitoring methods are often indirect or laboratory-based.
  • Need for real-time, in-situ oil condition monitoring.

Purpose of the Study:

  • To develop and validate a novel integrated micro-viscometer for real-time engine oil monitoring.
  • To assess the performance of a system combining a Capacitive Micromachined Ultrasonic Transducer (CMUT) and an Application-Specific Integrated Circuit (ASIC).
  • To correlate viscosity changes with engine oil aging.

Main Methods:

  • Design and fabrication of a CMUT array and a low-power transceiver ASIC.
  • Integration of a charge pump for CMUT polarization voltage.
  • Immersion of the CMUT in engine oil to generate and capture acoustic waves.
  • Testing with various engine oils across different temperatures and aging states.

Main Results:

  • Demonstrated significant frequency shift correlating with dynamic viscosity changes in aged engine oils.
  • Measured a frequency shift of -1.9 kHz/cP, equivalent to 33 Hz/mile.
  • Achieved low receiver power consumption (72 µW) with high bandwidth (7 MHz) and low noise.

Conclusions:

  • The integrated micro-viscometer offers a high-accuracy solution for in-situ engine oil condition monitoring.
  • The developed system enables economic and environmentally friendly oil usage through timely replacement.
  • This technology advances the field of integrated sensing for automotive and industrial applications.