Smart Structures and Systems

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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)
  • Received : 2006.10.17
  • Accepted : 2008.01.17
  • Published : 2008.07.25
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Abstract

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.

Keywords

References

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