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An optimized total focusing method based on delay-multiply-and-sum for nondestructive testing.

Da Teng1, Lishuai Liu1, Yanxun Xiang1

  • 1Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.

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Summary
This summary is machine-generated.

This study optimizes the Total Focusing Method (TFM) for ultrasonic phased array imaging. By integrating modified delay-multiply-and-sum (DMAS) beamforming, it significantly enhances signal-to-noise ratio and lateral resolution, reducing artifacts.

Keywords:
Delay-multiply-and-sumPhased arraySynthetic focusingTotal focusing method

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Area of Science:

  • Non-destructive testing
  • Ultrasonic phased array imaging
  • Signal processing

Background:

  • Total Focusing Method (TFM) offers high resolution but suffers from artifacts and noise.
  • Conventional synthetic focusing in TFM ignores spatial array signal information, limiting performance.
  • Single-element emission in full matrix capture reduces signal-to-noise ratio (SNR).

Purpose of the Study:

  • To optimize TFM imaging performance by combining modified delay-multiply-and-sum (DMAS) beamforming with synthetic focusing.
  • To leverage both defect and spatial information for improved ultrasonic image reconstruction.
  • To enhance SNR and lateral spatial resolution in TFM imaging.

Main Methods:

  • Integration of a modified delay-multiply-and-sum (DMAS) beamforming approach into the TFM algorithm.
  • Utilizing both defect and spatial information from array datasets.
  • Generating new frequency components for enhanced image reconstruction.

Main Results:

  • Significant improvement in signal-to-noise ratio (SNR) for the optimized TFM.
  • Enhanced lateral spatial resolution attributed to increased equivalent transducer elements and second harmonic components.
  • Demonstrated considerable improvements through comparative simulation and experimental validation.

Conclusions:

  • The proposed DMAS-based TFM provides a promising alternative for ultrasonic phased array post-processing.
  • The optimized TFM effectively utilizes spatial information for superior image reconstruction.
  • This method offers improved imaging performance, addressing limitations of conventional TFM.