Laser Ultrasound Techniques for Aerospace Applications

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: 31 January 2025 | Viewed by 1992

Special Issue Editors


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Guest Editor
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Interests: laser ultrasound; NDT/SHM; sensor and robotics; machine learning

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Guest Editor
Department of Aerospace Engineering, Faculty of Engineering, Universiti Puta Malaysia, Serdang 43400, Selangor, Malaysia
Interests: aeroelasticity; structural dynamics; vibration; swarm intelligence; reduced order

Special Issue Information

Dear Colleagues,

Ultrasonic testing plays a crucial role in ensuring structural integrity and performance evaluation across the aerospace industry. However, conventional contact ultrasound methods have limitations for in situ inspection of complex aircraft components. Recently, laser-based non-contact ultrasound techniques have shown great potential to address these challenges.

By using laser sources to generate and detect ultrasound waves, laser ultrasonic methods allow for remote and versatile inspection capabilities without requiring direct probe contact. This enables the evaluation of safety-critical or hard-to-reach areas on aircraft or spacecraft. Nonetheless, applications of laser ultrasound in real aerospace systems are still limited due to technical issues such as coupling efficiency, multi-modal wave detection, and interpretation of results under service conditions. Technological advancements are much needed to address these limitations. These include, among others, the development of efficient laser ultrasound generation and detection methodologies, the optimization of signal processing algorithms for aerospace materials, and the enhancement of inspection techniques for critical aerospace components

This Special Issue aims to advance the field by bringing together the latest research. Original contributions are invited to address topics including, but not limited to, innovative laser ultrasound generation and detection techniques; multi-modal wave analysis and imaging algorithms; coupling characterization for advanced materials and surfaces; laser-based simulation of pyroshock, mechanical shock waves, or acoustic emissions; and case studies demonstrating field trials. Both theoretical and experimental studies that propel the methodology toward routine industrial deployment are welcome.

Dr. Chen Ciang Chia
Dr. Mohammad Yazdi Harmin
Guest Editors

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Keywords

  • laser ultrasound
  • non-destructive testing
  • aircraft structural integrity
  • high-resolution imaging
  • structural health monitoring
  • signal processing algorithms
  • material characterization
  • complex geometries
  • laser pyroshock simulation
  • laser acoustic emission training
  • machine learning

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Published Papers (1 paper)

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Research

22 pages, 6420 KiB  
Article
High-Resolution Wavenumber Bandpass Filtering of Guided Ultrasonic Wavefield for the Visualization of Subtle Structural Flaws
by Lee Shi Yn, Fairuz Izzuddin Romli, Norkhairunnisa Mazlan, Jung-Ryul Lee, Mohammad Yazdi Harmin and Chia Chen Ciang
Aerospace 2024, 11(7), 524; https://doi.org/10.3390/aerospace11070524 - 27 Jun 2024
Viewed by 1538
Abstract
Guided ultrasonic wavefield propagation imaging (GUPI) is useful for visualizing hidden flaws in aerospace thin-walled structures, but the need for subjective signal processing involving three-dimensional Fourier transformation to increase the visibility of subtle flaws hinders its wider acceptance. A high-resolution wavenumber bandpass filter [...] Read more.
Guided ultrasonic wavefield propagation imaging (GUPI) is useful for visualizing hidden flaws in aerospace thin-walled structures, but the need for subjective signal processing involving three-dimensional Fourier transformation to increase the visibility of subtle flaws hinders its wider acceptance. A high-resolution wavenumber bandpass filter capable of consolidating subtle flaw-relevant information from a wide frequency band using only two-dimensional Fourier transformation was proposed. The filter overturns the long-standing belief that modes must be separated based on narrow-band data acquisition or processing to achieve high flaw visibility. Its characteristics and advantages were experimentally demonstrated through enhanced visualization of hidden wall-thinning flaws of a plate specimen. Its strength was further demonstrated through the first GUPI visualization of a partially loosened bolt, with unprecedented clarity to discern bolt tightness levels. The results conclusively proved that the proposed filter significantly enhances the resolution of GUPI within a structured processing framework. Full article
(This article belongs to the Special Issue Laser Ultrasound Techniques for Aerospace Applications)
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