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Proceedings Paper

MIMO array imaging for ultrasonic nondestructive testing
Author(s): Ramazan Demirli; Xavier Rivenq; Yimin D. Zhang; Cornel Ioana; Moeness G. Amin
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Paper Abstract

Ultrasonic sensor arrays continue to be broadly applied for nondestructive material testing. Generally, conventional beamforming techniques have been the favorite approach to generate images from the sensor array data. In this paper, we examine the use of multiple-input multiple-output (MIMO) ultrasonic processing technique for imaging internal structures of materials. The goal is to identify and locate potential defects and anomalies. The imaging technique is comprised of excitation of transmitting sensors with sequential or orthogonal wideband signals, matched filtering, and adaptive weighting. The weighting of the signals at the receiver takes into account the transducer ultrasound radiation patterns. The MIMO technique is particularly attractive for ultrasonic imaging, as the different bistatic combinations of transmit and receive sensor pairs allows effective and simple formations of virtual arrays with extended apertures and denser spatial sampling. As such, high-resolution images can be generated with fewer or available transducers. The performance of this technique is experimentally examined using test specimens with artificially drilled small size flat bottom holes that simulate defects. One-dimensional and two-dimensional array configurations are used to form desired virtual arrays and their respective imaging capabilities are evaluated and compared.

Paper Details

Date Published: 19 April 2011
PDF: 10 pages
Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 798338 (19 April 2011); doi: 10.1117/12.880239
Show Author Affiliations
Ramazan Demirli, Villanova Univ. (United States)
Xavier Rivenq, Institut National Polytechnique de Grenoble (France)
Yimin D. Zhang, Villanova Univ. (United States)
Cornel Ioana, Institut National Polytechnique de Grenoble (France)
Moeness G. Amin, Villanova Univ. (United States)


Published in SPIE Proceedings Vol. 7983:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011
H. Felix Wu, Editor(s)

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