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Related Experiment Video

Updated: Oct 17, 2025

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Published on: March 6, 2019

Probe Standoff Optimization Method for Phased Array Ultrasonic TFM Imaging of Curved Parts.

Jorge Franklin Mansur Rodrigues Filho¹, Pierre Bélanger¹

¹Department of Mechanical Engineering, École de Technologie Supérieure, Montreal, QC H3C 1K3, Canada.

Sensors (Basel, Switzerland)

|October 13, 2021

Summary

Optimizing probe standoff significantly enhances ultrasonic phased array total focusing method (TFM) imaging, especially for curved parts. This method reduces artifacts and improves defect detection by finding the ideal standoff distance.

Keywords:

PSF TFM curved surfaces phased array standoff ultrasound

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Last Updated: Oct 17, 2025

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Published on: March 6, 2019

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays

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Published on: June 13, 2023

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

Area of Science:

Non-destructive testing
Ultrasonic testing
Phased array ultrasonics

Background:

The reliability of ultrasonic phased array total focusing method (TFM) imaging is crucial for inspecting components with complex geometries.
Surface profile and probe standoff combinations can introduce significant artifacts and reduce resolution in TFM images, hindering defect identification.

Purpose of the Study:

To introduce a probe standoff optimization method (PSOM) to mitigate artifacts and improve TFM imaging quality.
To identify the optimal probe standoff that minimizes image degradation for curved surfaces.

Main Methods:

Developed a probe standoff optimization method (PSOM) based on point spread function (PSF) analysis.
Validated the PSOM by conducting experiments on concave and convex specimens with varying amplitudes and standoffs.
Evaluated TFM imaging performance using signal-to-artifact ratio (SAR) and array performance indicator (API) metrics.

Main Results:

PSOM accurately predicted PSF characteristics that correlated with TFM image quality.
Optimal probe standoff significantly improved TFM imaging performance.
SAR improved by up to 13 dB for convex specimens and 33 dB for concave specimens; API was minimized for convex specimens.

Conclusions:

The probe standoff optimization method (PSOM) effectively enhances TFM imaging reliability for curved geometries.
Optimizing probe standoff is critical for reducing artifacts and improving defect detection capabilities in phased array ultrasonic testing.
The PSOM provides a quantifiable approach to achieving superior TFM image quality.