| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 21, Number 2, 2025
|
|
|---|---|---|
| Article Number | 39 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/jeos/2025034 | |
| Published online | 03 September 2025 | |
Research Article
Full-field imaging of guided ultrasonic wave fields using lensless digital holography
1
BIAS – Bremer Institut für Angewandte Strahltechnik, Klagenfurter Str. 5, 28359 Bremen, Germany
2
Universität Bremen, Fachbereich 01: Physik/Elektrotechnik, 28359 Bremen, Germany
3
FIBRE – Faserinstitut Bremen e.V., Am Biologischen Garten 2, 28359 Bremen, Germany
4
Universität Bremen, Fachbereich 04: Produktionstechnik, 28359 Bremen, Germany
5
MAPEX Center for Materials and Processes, 28359 Bremen, Germany
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
19
June
2025
Accepted:
11
July
2025
Abstract
In this work, we present the full-field measurement of guided ultrasonic waves (GUWs) on technical surfaces using lensless digital holography. The setup works with a pulsed coherent laser illumination and a complementary metal-oxide semiconductor (CMOS) sensor without using any imaging optics. It provides highly resolved single-shot height measurements featuring the deformation introduced to the material by ultrasound excitation via piezoelectric actuators. For the evaluation of the resulting height distribution, we propose the multidirectional structure function offering pixel-precise determination of the wavelength. This ability is used to carry out a comparison between two aluminum plates of different thicknesses. Here, the resulting difference in wavelengths reflects the change in the thickness and is in agreement with simulated results for the two specimens, qualifying the proposed method as a detector for GUWs.
Key words: Lensless / Digital holography / Guided ultrasonic waves / Structure function / Non-destructive testing / Ultrasound
© The Author(s), published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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