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This chapter provides a comprehensive overview of ultrasonic wavefield propagation imaging (UPI) as an advanced non-destructive inspection (NDINon-Destructive Inspection (NDI)) technique for aircraftAircraft structures. UPI employs laser-based ultrasonic generation and optical sensing to capture full-field wave propagationWave propagation, enabling detailed visualization and assessment of structural integrity. The chapter begins by outlining the purpose, relevance, and distinguishing features of UPI within the context of aircraftAircraft maintenance. It then discusses the physical principles governing the technique, including ultrasonic wave behavior, laser excitation regimes, and wave-damage interactions. Multiple system configurations and wavefield acquisition strategies are presented, with discussion of practical deployment considerations and trade-offs between scanning resolution and inspection speed. Signal processing approaches across spatial, temporal, frequency, and wavenumber domains are introduced to demonstrate how damage indicators can be extracted from complex datasets. Finally, three case studies involving metallic and composite aircraftAircraft components illustrate the practical versatility and field readiness of UPI. Together, these elements establish UPI as a capable inspection solution for real-world aviation applications.

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Laser Ultrasonic Wavefield Propagation Imaging for Aircraft Structures

  • 章节

  • 发表日期：

    2026年

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  • Chen Ciang Chia,
  • Shi Yn Lee,
  • Jung-Ryul Lee,
  • Mohammad Yazdi Harmin

摘要

This chapter provides a comprehensive overview of ultrasonic wavefield propagation imaging (UPI) as an advanced non-destructive inspection (NDINon-Destructive Inspection (NDI)) technique for aircraftAircraft structures. UPI employs laser-based ultrasonic generation and optical sensing to capture full-field wave propagationWave propagation, enabling detailed visualization and assessment of structural integrity. The chapter begins by outlining the purpose, relevance, and distinguishing features of UPI within the context of aircraftAircraft maintenance. It then discusses the physical principles governing the technique, including ultrasonic wave behavior, laser excitation regimes, and wave-damage interactions. Multiple system configurations and wavefield acquisition strategies are presented, with discussion of practical deployment considerations and trade-offs between scanning resolution and inspection speed. Signal processing approaches across spatial, temporal, frequency, and wavenumber domains are introduced to demonstrate how damage indicators can be extracted from complex datasets. Finally, three case studies involving metallic and composite aircraftAircraft components illustrate the practical versatility and field readiness of UPI. Together, these elements establish UPI as a capable inspection solution for real-world aviation applications.