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Ultrasonic Phased Array Sparse-TFM Imaging Based on Sparse Array Optimization and New Edge-Directed Interpolation.

Hongwei Hu1, Jian Du2, Chengbao Ye3

  • 1College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China. hhwlucky@163.com.

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Summary
This summary is machine-generated.

This study optimizes ultrasonic phased array total focusing method (TFM) imaging speed by using sparse arrays and interpolation. The new method significantly improves imaging efficiency with minimal impact on quantitative accuracy.

Keywords:
new edge-directed interpolationsparse array optimizationsparse-TFM imagingultrasonic phased array

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Signal processing

Background:

  • Ultrasonic phased array total focusing method (TFM) offers high resolution but suffers from long imaging times, hindering industrial application.
  • Existing TFM methods face computational challenges due to extensive data processing requirements.

Purpose of the Study:

  • To enhance the imaging speed of TFM for practical industrial applications.
  • To reduce the computational demand of TFM while maintaining high image quality and quantitative accuracy.

Main Methods:

  • Optimized sparse array element locations using Almost Different Sets with Genetic Algorithm (ADSGA).
  • Corrected effective aperture based on equivalent point diffusion function consistency.
  • Employed New Edge-Directed Interpolation (NEDI) to reconstruct high-resolution images from sparse data.

Main Results:

  • Achieved a 16-fold increase in imaging speed with a sparse array (8 elements from 32) compared to full array TFM.
  • Quantitative accuracy decreased by only 1.09% compared to standard TFM.
  • Successfully reconstructed high-quality sparse-TFM images using NEDI.

Conclusions:

  • The proposed sparse-TFM method significantly accelerates imaging time without substantial loss in quantitative accuracy.
  • This approach offers a viable solution for efficient industrial ultrasonic non-destructive testing.
  • Combining ADSGA optimization and NEDI interpolation enhances TFM's practical applicability.