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Microwave de-embedding techniques applied to acoustics.

Charles M Jackson1

  • 1Raytheon Space and Airborne Systems, El Segundo, CA 90245, USA. c.jackson@ieee.org

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 11, 2005
PubMed
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This study applies microwave Time Domain Reflectometry (TDR) and de-embedding to acoustics, specifically for woodwind instruments. The research validates calibration methods and presents accurate S-parameter measurements for these instruments.

Area of Science:

  • Acoustics
  • Microwave Engineering
  • Instrument Physics

Background:

  • Traditional acoustic measurements can be complex.
  • Microwave techniques offer precise signal analysis.
  • De-embedding is crucial for isolating instrument characteristics.

Purpose of the Study:

  • To explore the application of Time Domain Reflectometry (TDR) in acoustics.
  • To present and evaluate calibration methods for acoustic TDR.
  • To obtain accurate S-parameter measurements of woodwind instruments using de-embedding.

Main Methods:

  • Utilized microwave Time Domain Reflectometry (TDR) for acoustic measurements.
  • Developed and presented two distinct calibration methods for the reflectometer.
  • Applied de-embedding techniques to raw measured data.

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  • Modeled and measured S-parameters of woodwind instruments.

    • Main Results:

    • Demonstrated the feasibility of using TDR in acoustical applications.
    • Evaluated the consistency and accuracy of the presented calibration methods.
    • Obtained de-embedded S-parameters for woodwind instruments, improving measurement accuracy.
    • Presented a detailed description of the acoustic TDR setup.

    Conclusions:

    • Microwave TDR combined with de-embedding is a viable technique for acoustic analysis.
    • The presented calibration methods ensure reliable and consistent measurements.
    • Accurate S-parameters were successfully extracted for woodwind instruments, aiding further research.