A scaling method to enhance detection of a nonlinear elastic response

Abstract

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Imaging of human tooth using ultrasound based chirp-coded nonlinear time reversal acoustics

“…NEWS with TR procedure has been recognized as a useful tool for non-destructive testing (cracks detection) of various solid materials, such as complex composites. During the pioneering work in bubbly liquids [15], efficiency of TR-NEWS methods have been numerically demonstrated [30] and extended [31][32][33] in complex structure for crack identification and detection.…”

Evolution of damage-induced nonlinearity in proximity of discontinuities in concrete

“…As an example, results from a traditional wave spectroscopy analysis (Van den Abeele et al, 2000;CamposPozuelo et al, 2006;Goursolle et al, 2008) may be biased by the low amplitude of the higher order harmonics (or sub-harmonics) generated (Antonaci et al, 2010), which are frequently submerged within the noise level. As an alternative, we have recently proposed a scaling subtraction method (SSM) (Scalerandi et al, 2008a; et al, 2009) which allows to detect the influence of the nonlinearity of the sample on the portion of the signal at the fundamental frequency, with benefits in terms of signal-to-noise ratio. We have shown elsewhere the sensitivity of the method both to the presence of nonlinearity (Scalerandi et al, 2008b) and to its evolution (Bruno et al, 2009).…”

“…the one recorded from the receiver).More details about the procedure can be found inScalerandi et al (2008a) andBruno et al (2009).…”

Stress corrosion crack depth investigation using the time reversed elastic nonlinearity diagnostic

“…A frequency domain version 9 of the Scaling Subtraction Method (SSM) 13 is conducted to quantify the amount of nonlinearity present between the low and high amplitude focal signals. A Fast Fourier Transform (FFT) is performed on both the low and high amplitude focal signals.…”