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Closed-loop feedback control for microfluidic systems through automated capacitive fluid height sensing.

L R Soenksen1, T Kassis2, M Noh1

  • 1Department of Mechanical Engineering, MIT, Cambridge, MA, USA. soenksen@mit.edu and Research Laboratory of Electronics, MIT, Cambridge, MA, USA.

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Summary
This summary is machine-generated.

We developed a non-contact capacitive sensor for precise fluid height measurement in microfluidic systems. This technology enables accurate monitoring and control of small fluid volumes, crucial for microfluidic applications.

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Area of Science:

  • Microfluidics
  • Sensor Technology
  • Control Systems

Background:

  • Accurate fluid height sensing in microfluidic devices (<1 mL) is challenging, particularly without direct sensor contact.
  • Existing gravity-driven microfluidic systems often lack monitoring due to sensing limitations, remaining open-loop.
  • Non-contact sensing is crucial for applications where fluid contamination or sensor fouling is a concern.

Purpose of the Study:

  • To present an optimized self-shielded coplanar capacitive sensor and automated control system.
  • To achieve submillimeter fluid-height resolution (∼250 μm) for small-scale open reservoirs.
  • To enable non-contact monitoring and closed-loop control of microfluidic systems.

Main Methods:

  • Design and optimization of a self-shielded coplanar capacitive sensor.
  • Development of an automated control system for fluid height regulation.
  • Testing and validation of the sensor system in various microfluidic conditions, including cell culture.

Main Results:

  • Achieved submillimeter fluid-height resolution (∼250 μm) without direct fluid contact.
  • Demonstrated robust characterization, calibration, and dynamic control of microfluidic systems.
  • Validated the system's effectiveness in cell culture conditions.

Conclusions:

  • Capacitive sensing offers a scalable, cost-effective solution for continuous fluid monitoring in microfluidics.
  • The developed system enables closed-loop feedback control of fluid volumes in small-scale, gravity-dominated microfluidic applications.
  • This technology addresses a critical need for precise, non-contact fluid level sensing in microfluidics.