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The Effect of the Position Determination Error for Flexible Linear Array Elements on the Tomogram Focusing.

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  • 1School of Non-Destructive Testing, National Research Tomsk Polytechnic University, 30 Lenin Avenue, 634050 Tomsk, Russia.

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This study defines acceptable coordinate deviations for flexible acoustic arrays in ultrasonic inspection of curved surfaces. Precise element positioning ensures high-quality tomogram focusing, crucial for accurate defect detection.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Acoustic metrology

Background:

  • Accurate tomogram focusing is essential for effective ultrasonic inspection, especially for complex geometries like curved surfaces.
  • Flexible acoustic arrays offer advantages in inspecting such objects but require precise element positioning for optimal performance.

Purpose of the Study:

  • To theoretically and experimentally determine acceptable deviation limits for flexible acoustic array element coordinates.
  • To evaluate the impact of coordinate deviations on tomogram focusing quality during ultrasonic inspection of curved surfaces.

Main Methods:

  • Tomogram reconstruction using the total focusing method.
  • Assessment of tomogram focusing quality using the Strehl ratio.
  • Simulation and experimental validation with convex and concave curved arrays.

Main Results:

  • Established that flexible acoustic array element coordinates can be determined with an error not exceeding 0.18λ (wavelength).
  • Demonstrated that maintaining this precision results in a sharply focused tomogram image.
  • Validated the findings through both simulated and experimental ultrasonic inspection procedures.

Conclusions:

  • Precise control over flexible acoustic array element coordinates is critical for high-quality tomogram focusing in ultrasonic inspection.
  • The defined deviation limits (≤0.18λ) ensure reliable and accurate imaging of curved surfaces.
  • This research provides a foundational understanding for developing advanced ultrasonic inspection techniques for complex geometries.