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Broadband Laser Ultrasonic Excitation and Multi-band Sensing for Hierarchical Automatic Damage Visualization

  • Mai-Thanh Thai
  • Hasan Ahmed
  • Seung-Chan Hong
  • Jung-Ryul LeeEmail author
  • Jeong-Beom Ihn
Original Paper
  • 3 Downloads

Abstract

It is well known that the selection of a frequency for signal generation and data acquisition significantly affects the quality of ultrasonic or laser ultrasonic nondestructive testing (NDT) results, and the analog filter is essential to prevent the aliasing effect. This paper presents a systematic approach using a hierarchical inspection scheme for automatic inspection processes. A frequency band divider (FBD) with a single-input–multiple-output (SIMO) system was newly created to examine quickly various frequency ranges at single scanning using laser-based broadband excitation. The FBD was implemented into a pulse-echo ultrasonic propagation imaging (PE UPI) system capable of fully noncontact laser ultrasonic inspection. Only two scans are required to determine the optimal frequency range for unknown specimens. This tremendously reduces the number of scanning trials for the investigation of complete frequency ranges.

Keywords

Hierarchical approach Nondestructive testing Pulse-echo ultrasonic propagation imager Programmable band-pass filter 

Notes

Acknowledgements

The work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (NRF-2017R1A5A1015311) and the Boeing Company.

Supplementary material

42405_2019_210_MOESM1_ESM.rar (35.5 mb)
Supplementary material 1 (RAR 36,324 kb)

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Copyright information

© The Korean Society for Aeronautical & Space Sciences 2019

Authors and Affiliations

  • Mai-Thanh Thai
    • 1
  • Hasan Ahmed
    • 1
  • Seung-Chan Hong
    • 1
  • Jung-Ryul Lee
    • 1
    Email author
  • Jeong-Beom Ihn
    • 2
  1. 1.Department of Aerospace EngineeringKorea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea
  2. 2.Structures Technology, Boeing Research and TechnologySeattleUSA

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