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Bendable Phased-Array Ultrasound Transducer for Imaging on Curved Surfaces.

Shizhen Yin^1,2,3, Han Zhang^4,5, Fangfang Shi^5,6

¹State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.

|February 20, 2025

Summary

This summary is machine-generated.

This study presents a novel bendable phased-array ultrasound transducer (PAUT) with a constant-pitch-preservation design for improved nondestructive testing on curved surfaces. This innovation ensures accurate ultrasound imaging by maintaining consistent element spacing.

Keywords:

curved surface flexible electronics nondestructive testing phased array transducer ultrasonic imaging

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Area of Science:

Nondestructive Testing
Materials Science
Biomedical Engineering

Background:

Flexible phased-array ultrasound transducers (PAUTs) are crucial for nondestructive testing in various applications.
Stretchable PAUTs excel on complex curves but struggle with variable element pitches and real-time pitch measurement.
Bendable PAUTs offer a more practical engineering solution, though with limitations in pitch variability.

Purpose of the Study:

To introduce an innovative bendable PAUT with a Constant-Pitch-Preservation (CPP) design.
To address the challenges of variable element pitches in flexible PAUTs for curved surface applications.
To enhance the precision of ultrasound beam steering and focusing on non-uniform surfaces.

Main Methods:

Developed a flexible 12x12 piezo-composite element array bonded with silicone.
Implemented a Constant-Pitch-Preservation (CPP) design to maintain uniform element pitches.
Incorporated individual backing and matching blocks for each piezoelectric element.

Main Results:

The CPP design allows the transducer to conform to varying curvatures while preserving constant element pitches.
Enabled accurate progressive time delays for precise ultrasound beam steering and focusing.
Experimental pulse-echo inspections and sector scans demonstrated high-quality imaging capabilities.

Conclusions:

The novel bendable PAUT with CPP design effectively overcomes limitations of traditional flexible PAUTs.
This technology facilitates accurate nondestructive testing on complex curved surfaces.
The design enhances detection performance and imaging quality for advanced applications.