Title: Non-linear time reversal ultrasonic pseudo-tomography

Authors: Zdenek Prevorovsky; Sarka Vejvodova; Josef Krofta; David Prevorovsky

Addresses: NDT Department, Institute of Thermomechanics AS CR, v.v.i., Dolejskova 1402/5, 182 00, Prague 8, Czech Republic. ' NDT Department, Institute of Thermomechanics AS CR, v.v.i., Dolejskova 1402/5, 182 00, Prague 8, Czech Republic. ' NDT Department, Institute of Thermomechanics AS CR, v.v.i., Dolejskova 1402/5, 182 00, Prague 8, Czech Republic. ' NDT Department, Institute of Thermomechanics AS CR, v.v.i., Dolejskova 1402/5, 182 00, Prague 8, Czech Republic

Abstract: Non-linear elastic wave spectroscopy (NEWS) became an effective methodology for NDT of complex structures, providing high sensitivity of damage detection. One of the most promising NEWS procedures is based on non-linear time reversal mirrors (NLTRM). General NLTRM procedure is mostly global, which brings difficulties with defect localisation. In this paper, a procedure modification is proposed, based on similar arrangement as ultrasonic tomography. Array of transducers is spaced on a structure with defect. Individual piezoelectric transducers subsequently transmit direct signals, which are detected by receivers, then time-reversed and sent back. High-voltage relay multiplexer is used to switch between transmitters and receivers. Matrices of back-received signals and their spectra are analysed, and their non-linear features are extracted along all wave-paths. Procedure application is illustrated by NDT of aircraft parts where NLTRM pseudo-tomography is used to allocate defective zones.

Keywords: nondestructive testing; NDT; nonlinear elastic wave spectroscopy; NEWS; time reversal mirrors; materials properties; ultrasonic pseudo-tomography; defect localisation; piezoelectric transducers; aircraft parts; defects.

DOI: 10.1504/IJMMP.2011.043216

International Journal of Microstructure and Materials Properties, 2011 Vol.6 No.3/4, pp.206 - 213

Available online: 20 Oct 2011 *

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