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Related Concept Videos

Capacitor With A Dielectric01:18

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Development of Vacuum-Chamber-Type Capacitive Micro-Pressure Sensors.

Lung-Jieh Yang1, De-Yu Jiang1, Wei-Chen Wang1

  • 1Department of Mechanical and Electromechanical Engineering, Tamkang University, New Taipei City 251301, Taiwan.

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|November 27, 2025
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Summary
This summary is machine-generated.

This study developed a novel capacitive pressure sensor for dynamic flow field measurements. The sensor achieves 1-2 Pa resolution, enhancing flow monitoring capabilities.

Keywords:
capacitive pressure sensorcomplementary metal oxide semiconductor (CMOS)vacuum chamber

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Area of Science:

  • Sensor Technology
  • Microelectromechanical Systems (MEMS)

Background:

  • Accurate dynamic pressure measurement is crucial for understanding fluid dynamics.
  • Existing sensors may lack the required sensitivity or linearity for low-pressure flow fields.

Purpose of the Study:

  • To develop and characterize a high-resolution capacitive pressure sensor for dynamic flow field applications.
  • To leverage CMOS-MEMS technology for integrated sensor fabrication.

Main Methods:

  • Fabrication using UMC 0.18 μm CMOS-MEMS process with post-processing (metal etching, supercritical CO2 drying, parylene encapsulation).
  • Utilized AD7746 capacitance-to-voltage converter (CVC) for signal processing.
  • Designed a vacuum-sealed diaphragm capsule with dual movable circular membranes and a trapezoidal/Gong-like vacuum-chamber diaphragm for contact-mode capacitive sensing.

Main Results:

  • The developed capacitive pressure sensor demonstrates feasibility for dynamic pressure measurement.
  • Achieved an output sensitivity suitable for resolutions as low as 1-2 Pa.
  • The design enhances linearity and sensitivity through its specific diaphragm and chamber configuration.

Conclusions:

  • The CMOS-MEMS capacitive pressure sensor is a viable solution for precise dynamic pressure measurements in flow fields.
  • The sensor design offers improved performance characteristics for low-pressure sensing applications.
  • Further integration and application in fluid dynamics research are anticipated.