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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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A procedure and device for determining complex material permittivity using the free-space resonance method.

Lin Qin1, En Li1, Yunpeng Zhang1

  • 1School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

The Review of Scientific Instruments
|April 6, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a new method for testing microwave dielectric materials

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Non-destructive Testing

Background:

  • Accurate measurement of complex permittivity is crucial for microwave dielectric materials.
  • Existing non-destructive testing methods face challenges with accuracy and influence from variable physical cavity lengths.

Purpose of the Study:

  • To design essential technologies for complex permittivity testing of microwave dielectric materials.
  • To develop and validate a non-destructive testing system using the free-space resonance method.
  • To propose cavity calibration technology to mitigate the impact of variable physical cavity length.

Main Methods:

  • Systematic design of essential technologies for complex permittivity measurement.
  • Development of a testing system on a mobile surveying platform.
  • Application of variable and constant physical cavity length algorithms for X-band testing.
  • Implementation of cavity calibration technology.

Main Results:

  • The developed system successfully performed non-destructive testing of complex permittivity.
  • Consistent results were obtained using both variable and constant physical cavity length algorithms.
  • The error in complex permittivity measurements was less than 5% for tested materials.
  • Cavity calibration effectively reduced the influence of variable physical cavity length.

Conclusions:

  • The proposed free-space resonance method with cavity calibration is effective for non-destructive complex permittivity testing.
  • The system provides accurate measurements for materials like polytetrafluoroethylene, glass steel plate, and corundum.
  • This technology offers a reliable solution for characterizing microwave dielectric materials.