Smart Structures and Systems

  • 제4권4호
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  • Pages.449-464
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  • 2008
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A migration based reconstruction algorithm for the imaging of defects in a plate using a compact array

  • Muralidharan, Ajith (Center for Nondestructive Evaluation, Department of Mechanical Engineering, Indian Institute of Technology) ;
  • Balasubramaniam, Krishnan (Center for Nondestructive Evaluation, Department of Mechanical Engineering, Indian Institute of Technology) ;
  • Krishnamurthy, C.V. (Center for Nondestructive Evaluation, Department of Mechanical Engineering, Indian Institute of Technology)
  • 투고 : 2006.10.17
  • 심사 : 2008.01.17
  • 발행 : 2008.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

An array based, outward monitoring, ultrasonic guided wave based SHM technique using a single transmitter and multiple receivers (STMR), with a small footprint is discussed here. The previous implementation of such SHM arrays used a phase-reconstruction algorithm (that is similar to the beam-steering algorithm) for the imaging of reflectors. These algorithms were found to have a limitation during the imaging of defects/reflectors that are present in the "near-field" of the array. Here, the "near-field" is defined to be approximately 3-4 times the diameter of the compact array. This limitation is caused by approximations in the beam-steering reconstruction algorithm. In this paper, a migration-based reconstruction algorithm, with dispersion correction in the frequency domain, is discussed. Simulation and experimental studies are used to demonstrate that this algorithm improves the reconstruction in the "near-field" without decreasing the ability to reconstruct defects in the "far-field" in both isotropic and anisotropic plates.

키워드

참고문헌

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피인용 문헌

  1. Structural health monitoring of anisotropic plates using ultrasonic guided wave STMR array patches vol.42, pp.3, 2009, https://doi.org/10.1016/j.ndteint.2008.09.012
  2. Blind inversion method using Lamb waves for the complete elastic property characterization of anisotropic plates vol.125, pp.2, 2009, https://doi.org/10.1121/1.3050253
  3. Application of a matched filter approach for finite aperture transducers for the synthetic aperture imaging of defects vol.57, pp.6, 2010, https://doi.org/10.1109/TUFFC.2010.1556
  4. Lamb wave-based damage imaging method for damage detection of rectangular composite plates vol.1, pp.4, 2014, https://doi.org/10.12989/smm.2014.1.4.411
  5. Sensitivity analysis of circumferential transducer array with T(0,1) mode of pipes vol.21, pp.6, 2008, https://doi.org/10.12989/sss.2018.21.6.761