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Sensors 2012, 12(1), 42-54; doi:10.3390/s120100042

Ultrasound Nondestructive Evaluation (NDE) Imaging with Transducer Arrays and Adaptive Processing

Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, 204 George Street, Glasgow G1 1XW, UK
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Received: 23 November 2011 / Revised: 19 December 2011 / Accepted: 21 December 2011 / Published: 22 December 2011
(This article belongs to the Section Physical Sensors)
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Abstract

This paper addresses the challenging problem of ultrasonic non-destructive evaluation (NDE) imaging with adaptive transducer arrays. In NDE applications, most materials like concrete, stainless steel and carbon-reinforced composites used extensively in industries and civil engineering exhibit heterogeneous internal structure. When inspected using ultrasound, the signals from defects are significantly corrupted by the echoes form randomly distributed scatterers, even defects that are much larger than these random reflectors are difficult to detect with the conventional delay-and-sum operation. We propose to apply adaptive beamforming to the received data samples to reduce the interference and clutter noise. Beamforming is to manipulate the array beam pattern by appropriately weighting the per-element delayed data samples prior to summing them. The adaptive weights are computed from the statistical analysis of the data samples. This delay-weight-and-sum process can be explained as applying a lateral spatial filter to the signals across the probe aperture. Simulations show that the clutter noise is reduced by more than 30 dB and the lateral resolution is enhanced simultaneously when adaptive beamforming is applied. In experiments inspecting a steel block with side-drilled holes, good quantitative agreement with simulation results is demonstrated. View Full-Text
Keywords: transducer array; adaptive beamforming; ultrasound imaging; non-destructive evaluation (NDE) transducer array; adaptive beamforming; ultrasound imaging; non-destructive evaluation (NDE)
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Li, M.; Hayward, G. Ultrasound Nondestructive Evaluation (NDE) Imaging with Transducer Arrays and Adaptive Processing. Sensors 2012, 12, 42-54.

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