Detection and localization of a defect in a reverberant plate using acoustic field correlation

Chehami, Lynda; Moulin, Emmanuel; Rosny, Julien de; Prada, Claire; Matar, Olivier Bou; Benmeddour, Farouk; Assaad, Jamal

doi:10.1063/1.4867522

Cited by 44 publications

(42 citation statements)

References 22 publications

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“…Theoretical and experimental studies in several areas [16]- [21], have shown the existence of a relationship between the Green's function (acoustic impulse response) between two measurement points and the cross-correlation of noise signals recorded at these points.…”

Section: Methodsmentioning

confidence: 99%

“…original ultrasound technique relying on the correlation of non-coherent acoustic fields [13] [14] [15] [16]. Based on passive Green's function reconstruction [17], the principle is that such fields, ordinarily considered as noise in conventional NDT applications, can be judiciously exploited to estimate the response between two measurement points without the need for an active ultrasound source at one of these points.…”

Section: Recent Theoretical and Experimental Work Have Demonstrated mentioning

confidence: 99%

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Experimental Study of Acoustic Noise Correlation Technique for Passive Monitoring of Rails

Sadoudi¹,

Moulin²,

Assaad³

et al. 2016

MSA

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The work presented in this paper aims at investigating the ability of acoustic noise correlation technique for railway infrastructure health monitoring. The principle of this technique is based on impulse responses reconstruction by correlation of random noise propagated in the medium. Since wheel-rail interaction constitutes a source of such noise, correlation technique could be convenient for detection of rail defects using only passive sensors. Experiments have been carried out on a 2 m-long rail sample. Acoustic noise is generated in the sample at several positions. Direct comparison between an active emission-reception response and the estimated noise correlation function has confirmed the validity of the equivalence relation between them. The quality of the reconstruction is shown to be strongly related to the spatial distribution of the noise sources. High sensitivity of the noise-correlation functions to a local defect on the rail is also demonstrated. However, interpretation of the defect signature is more ambiguous than when using classical active responses. Application of a spatiotemporal Fourier transform on data recorded with variable sensor-defect distances has allowed overcoming this ambiguity.

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Section: Methodsmentioning

confidence: 99%

Section: Recent Theoretical and Experimental Work Have Demonstrated mentioning

confidence: 99%

Experimental Study of Acoustic Noise Correlation Technique for Passive Monitoring of Rails

Sadoudi¹,

Moulin²,

Assaad³

et al. 2016

MSA

Self Cite

View full text Add to dashboard Cite

show abstract

“…Theoretical and experimental studies in several areas [25][26][27][28], have shown that the active acoustic signal between two measurement points can be passively estimated from the time derivative of the correlation function of the signal recorded at those points.…”

Section: Passive Detection Methodsmentioning

confidence: 99%

ZigBee Sensor Network Platform for Health Monitoring of Rails Using Ambient Noise Correlation

Sadoudi¹,

Bocquet²,

Moulin³

et al. 2017

JEE

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WSNs (wireless sensor networks) can be used for railway infrastructure inspection and vehicle health monitoring. SHM (structural health monitoring) systems have a great potential to improve regular operation, security and maintenance routine of structures with estimating the state of its health and detecting the changes that affect its performance. This is vital for the development, upgrading, and expansion of railway networks. The work presented in this paper aims at the possible use of acoustic sensors coupled with ZigBee modules for health monitoring of rails. The detection principle is based on acoustic noise correlation techniques. Experiments have been performed in a rail sample to confirm the validity of acoustic noise correlation techniques in the rail. A wireless communication platform prototype based on the ZigBee/IEEE 802.15.4 technology has been implemented and deployed on a rail sample. Once the signals from the structure are collected, sensor data are transmitted through a ZigBee solution to the processing unit.

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“…Equation (2.3) shows that the Green's function associated with two locations r R l and r R l where sensors are deployed can be reconstructed by cross-correlation of the ambient recordings made by the two sensors, provided that the ambient noise is diffuse [26].…”

Section: Interferometry With Lamb Wavesmentioning

confidence: 99%

“…According to [26], the cross-correlation is related to the imaginary part of the Green's function by…”

Section: Interferometry With Lamb Wavesmentioning

confidence: 99%

Coda reconstruction from cross-correlation of a diffuse field on thin elastic plates

et al. 2017

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This study contributes to the evaluation of the robustness and accuracy of Green's function reconstruction from cross-correlation of strongly dispersed reverberated signals, with disentangling of the respective roles of ballistic and reverberated ('coda') contributions. We conduct a suite of experiments on a highly reverberating thin duralumin plate, where an approximately diffuse flexural wavefield is generated by taking advantage of the plate reverberation and wave dispersion. A large number of impulsive sources that cover the whole surface of the plate are used to validate ambient-noise theory through comparison of the causal and anticausal (i.e., positive-and negativetime) terms of the cross-correlation to one another, and to the directly measured Green's function. To quantify the contribution of the ballistic and coda signals, the cross-correlation integral is defined over different time windows of variable length, and the accuracy of the reconstructed Green's function is studied as a function of the initial and end times of the integral. We show that even cross-correlations measured over limited time windows converge to a significant part of the Green's function. Convergence is achieved over a wide time window, which includes not only direct flexuralwave arrivals, but also the multiply reverberated coda. We propose a model, based on normal-mode analysis that relates the similarity between the cross-correlation and the Green's function to the statistical properties of the plate. We also determine quantitatively how incoherent noise degrades the estimation of the Green's function.

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Detection and localization of a defect in a reverberant plate using acoustic field correlation

Cited by 44 publications

References 22 publications

Experimental Study of Acoustic Noise Correlation Technique for Passive Monitoring of Rails

Experimental Study of Acoustic Noise Correlation Technique for Passive Monitoring of Rails

ZigBee Sensor Network Platform for Health Monitoring of Rails Using Ambient Noise Correlation

Coda reconstruction from cross-correlation of a diffuse field on thin elastic plates

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