What question did this study set out to answer?

This research aims to improve nondestructive imaging techniques using laser ultrasonics and synthetic aperture methods.

March 26, 2026Open Access

Fundamental Study of Laser Ultrasonic Synthetic Aperture Imaging

Key Points

This research aims to improve nondestructive imaging techniques using laser ultrasonics and synthetic aperture methods.
Utilized multipoint laser irradiations for generating ultrasonic waves.
Employed an array probe for detecting ultrasound signals.
Implemented the synthetic aperture focusing technique (SAFT) using a delay-and-sum method.
SAFT improved the signal-to-noise ratio significantly during imaging.
Fine-pitch laser irradiation enhanced image resolution.
Performance was verified through tests on artificial flaws in metal.

Abstract

Laser ultrasonics utilizes laser irradiation to generate ultrasonic waves in a solid from its surface. In this study, nondestructive imaging is performed using multipoint laser irradiations and an array probe for detection. The imaging algorithm is based on the synthetic aperture focusing technique (SAFT), utilizing the delay-and-sum method. The SAFT enhances the signal-to-noise ratio by increasing the number of ultrasonic transmission and receiving points. Here, fine-pitch laser irradiation via multipoint scanning can raise the image resolution of the SAFT, and its performance is verified using artificial flaws in metal.

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