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Related Concept Videos

Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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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 Novel High-Speed Resonant Frequency Tracking Method Using Transient Characteristics in a Piezoelectric Transducer.

Jeonghoon Moon1, Sungjun Park2, Sangkil Lim3

  • 1DH Innovation Co., Ltd., Gwangju 61209, Korea.

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|September 9, 2022
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Summary
This summary is machine-generated.

This study introduces a fast resonant frequency tracking (RFT) method for ultrasonic systems. The new technique accurately tracks the piezoelectric transducer's mechanical resonance frequency for stable, high-power output in medical applications.

Keywords:
curve fittingpiezoelectric transducerresonant frequency trackingultrasonicunderdamped response characteristics

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Biomedical Engineering

Background:

  • Piezoelectric transducers (PTs) are crucial for ultrasonic systems, requiring operation at resonant frequency for efficient energy conversion.
  • PT resonant frequency fluctuates with load and environmental changes, necessitating rapid tracking for stable ultrasonic system output.
  • Fast resonant frequency tracking (RFT) is particularly vital in medical ultrasonic systems to prevent adverse effects like skin necrosis.

Purpose of the Study:

  • To propose a novel, high-speed resonant frequency tracking (RFT) method for piezoelectric transducers (PTs) in ultrasonic systems.
  • To enable stable and efficient power transfer in medical ultrasonic applications by accurately tracking PT mechanical resonance frequency.

Main Methods:

  • Utilized transient phenomena (underdamped response) in impedance systems, like ultrasonic generators, to determine system resonance frequency.
  • Derived the PT's mechanical resonance frequency from the system resonance frequency.
  • Conducted MATLAB simulations and equivalent circuit impedance analysis, considering PT pressure fluctuations and nonlinear LC filter characteristics.

Main Results:

  • Established a correlation between ultrasonic system resonance frequency and PT mechanical resonance frequency.
  • Developed and validated a method for tracking PT mechanical resonance frequency.
  • Experimental results demonstrated high accuracy and speed in tracking the mechanical resonance frequency using the proposed RFT method.

Conclusions:

  • The proposed high-speed RFT method effectively tracks the piezoelectric transducer's mechanical resonance frequency in real-time.
  • This method ensures maximum power transfer and stable operation for ultrasonic systems, especially in time-sensitive medical applications.
  • The approach offers a significant advancement for the reliability and performance of medical ultrasonic devices.