Time Reversal Techniques

Anderson, Brian E.; Remillieux, Marcel C.; Bas, Pierre‐Yves Le; Ulrich, Timothy J.

doi:10.1007/978-3-319-94476-0_14

Cited by 11 publications

(3 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The aim of this paper is to investigate the potential of methods based on nonlinear acoustics for closedcrack imaging. The imaging method employed here is based on time reversal, which focuses elastic energy at a prescribed location [15]. A study of the amplitude dependence of the elastic response allows then to locally probe the nonlinearity of the medium.…”

Section: Introductionmentioning

confidence: 99%

Fracture processes imaging in concrete using nonlinear ultrasound

Lott

Remillieux

Garnier

et al. 2021

NDT & E International

Self Cite

View full text Add to dashboard Cite

This paper shows the complementarity of two nonlinear ultrasonic imaging methods to characterize closed macro cracks in concrete. A time reversal mirror is used to locally probe and image the nonlinearity of a cracked region. Two nonlinear parameters are extracted to map the cracked region. The image obtained using the first parameter relates the harmonic generation due to the contact and frictional behaviors at the crack lips, correlated with vibro-thermography imaging of the same crack. The image obtained using the second parameter is based on the conditioning of the material induced by distributed micro cracks arising from the fracture process zone. These results show a great potential for characterization of fracture processes in concrete, with the possibility to uncouple the effects of the crack itself from surrounding distributed micro damage.

show abstract

Section: Introductionmentioning

confidence: 99%

Fracture processes imaging in concrete using nonlinear ultrasound

Lott

Remillieux

Garnier

et al. 2021

NDT & E International

Self Cite

View full text Add to dashboard Cite

show abstract

“…[40][41][42] An overview and summary of TR techniques for NDE utilizing nonlinear acoustics was recently published. 43 The TREND technique excites nonlinearities at a specific location by training a high amplitude TR focus of acoustic energy to that location. A series of scan points is selected in a region of interest and a TR focus is generated a) Electronic mail: bea@byu.edu and measured at each location in turn.…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic

Young

Anderson

Hogg

et al. 2019

The Journal of the Acoustical Society of America

Self Cite

View full text Add to dashboard Cite

The Time Reversed Elastic Nonlinearity Diagnostic (TREND) has a long history of successful nondestructive detection of cracks in solids using nonlinear indicators. Recent research implemented TREND to find stress corrosion cracking (SCC) in the heat-affected zone adjacent to welds in stainless steel. SCC development around welds is likely to occur due to the temperature and chemical exposure of steel canisters housing spent nuclear fuel. The ideal SCC detection technique would quantify the size and extent of the SCC, rather than just locating it, as TREND has been used for in the past. The current paper explores TREND's ability to detect an assumed increase in SCC over time using 13 samples exposed to a magnesium chloride (MgCl2) bath for different lengths of time. The samples are then scanned with TREND and nonlinearity is quantified for each scan point and each sample. The results suggest that TREND can be used to not only locate SCC in the heat-affected zone, but also track an increase in nonlinearity, and thereby an increase in damage, in samples exposed to the MgCl2 solution for a longer duration.

show abstract

“…16 While TR focusing inherently generates high-amplitude energy focusing, traditional TR signal processing may not be the optimal technique for nonlinear detection of cracks in otherwise isotropic media. A review of the use of TR techniques to detect nonlinear acoustic features for nondestructive evaluation was recently published by Anderson et al 17 Modifications to traditional TR processing have been studied in a variety of contexts. One-bit TR was developed by Derode et al as a method of increasing the amplitude of TR focusing, a technique later explored for use in lithotripsy.…”

Section: Introductionmentioning

confidence: 99%

A comparison of impulse response modification techniques for time reversal with application to crack detection

Young

Anderson

Willardson

et al. 2019

The Journal of the Acoustical Society of America

Self Cite

View full text Add to dashboard Cite

Time reversal (TR) focusing used for nonlinear detection of cracks relies on the ability of the TR process to provide spatially localized, high-amplitude excitation. The high amplitude improves the ability to detect nonlinear features that are a signature of the motion of closed cracks. It follows that a higher peak focal amplitude than what can be generated with the traditional TR process will improve the detection capability. Modifying the time-reversed impulse response to increase the amplitude of later arrivals in the impulse response, while maintaining the phase information of all arrivals, increases the overall focal signal amplitude. A variety of existing techniques for increasing amplitude are discussed, and decay compensation TR, a technique wherein amplitude is increased according to the inverse of the amplitude envelope of the impulse response decay, is identified as the best modification technique for nonlinear crack detection. This technique increases the focal signal amplitude with a minor introduction of harmonic content, a drawback in two other methods studied, one-bit TR and clipping TR. A final study employs both decay compensation TR and traditional TR, focusing on a rod with stress corrosion cracking, and compares the merits of each in detecting nonlinearity from cracks in a real system. V

show abstract

Time Reversal Techniques

Cited by 11 publications

References 101 publications

Fracture processes imaging in concrete using nonlinear ultrasound

Fracture processes imaging in concrete using nonlinear ultrasound

Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic

A comparison of impulse response modification techniques for time reversal with application to crack detection

Contact Info

Product

Resources

About