Amplitude and phase measurements of continuous diffuse fields for structural health monitoring of concrete structures

Structural health monitoring systems for civil structures based on ultrasonic guided waves face the problem of very high attenuation of mechanical waves in concrete. This means that it is difficult to cover large areas with a reasonable number of transducers. Continuous acoustic transmission, as opposed to pulse transmission, enables narrow-band, coherent measurements, which can be used to detect meaningful signals for very low signal levels. This study investigates the use of amplitude and phase measurements of single-frequency continuous acoustic transmissions, between two piezoelectric transducers, as indicators of damage in a concrete slab. The sensitivity to damage of these measurements are compared to pulsed coda wave analysis. The measurements of the continuous signals are performed with a lock-in amplifier, which is known to be able to detect very low signal levels. The amplitudes of the transmitted signal is decreased in order to simulate increased distance between transmitting and receiving transducer. It is shown that amplitude and phase measurements of the continuous wave field provide indication of damage equal to that of coda wave analysis of transmitted pulses and that these can be detected at much lower signal amplitudes. This indicates the possibility to increase spacing in a network of reciprocal transducers in a structural health-monitoring system. (Less)

[1]  Vincent Garnier,et al.  Acoustic techniques for concrete evaluation: Improvements, comparisons and consistency , 2013 .

[2]  M. Forde,et al.  Review of NDT methods in the assessment of concrete and masonry structures , 2001 .

[3]  R. Weaver,et al.  On the Larsen effect to monitor small fast changes in materials. , 2009, The Journal of the Acoustical Society of America.

[4]  Gangbing Song,et al.  Concrete structural health monitoring using embedded piezoceramic transducers , 2007 .

[5]  Gangbing Song,et al.  Health monitoring of reinforced concrete shear walls using smart aggregates , 2009 .

[6]  Philippe Roux,et al.  Stability of monitoring weak changes in multiply scattering media with ambient noise correlation: laboratory experiments. , 2009, The Journal of the Acoustical Society of America.

[7]  Hwai Chung Wu,et al.  Actively modulated acoustic nondestructive evaluation of concrete , 2004 .

[8]  William L. Ellsworth,et al.  Monitoring velocity variations in the crust using earthquake doublets: An application to the Calaveras Fault, California , 1984 .

[9]  Jin-Yeon Kim,et al.  Detection of damage in concrete using diffuse ultrasound. , 2010, The Journal of the Acoustical Society of America.

[10]  On the linewidth of the ultrasonic Larsen effect in a reverberant body , 2006 .

[11]  Pasquale Daponte,et al.  Ultrasonic signal-processing techniques for the measurement of damage growth in structural materials , 1995 .

[12]  Olivier Durand,et al.  MONITORING OF A LARGE CRACKED CONCRETE SAMPLE WITH NON- LINEAR MIXING OF ULTRASONIC CODA WAVES , 2014 .

[13]  Michael Fehler,et al.  Development of the active doublet method for measuring small velocity and attenuation changes in solids , 1992 .

[14]  Stephen Hall,et al.  Monitoring stress related velocity variation in concrete with a 2 x 10(-5) relative resolution using diffuse ultrasound. , 2009, The Journal of the Acoustical Society of America.

[15]  Olivier Durand,et al.  Nonlinear mixing of ultrasonic coda waves with lower frequency-swept pump waves for a global detection of defects in multiple scattering media , 2013 .

[16]  Roel Snieder,et al.  Coda Wave Interferometry for Estimating Nonlinear Behavior in Seismic Velocity , 2002, Science.

[17]  Gangbing Song,et al.  Structural health monitoring of concrete columns subjected to seismic excitations using piezoceramic-based sensors , 2011 .

[18]  Christoph Sens-Schönfelder,et al.  Passive image interferometry and seasonal variations of seismic velocities at Merapi Volcano, Indonesia , 2006 .

[19]  Patrice Rivard,et al.  Evaluating the damage in reinforced concrete slabs under bending test with the energy of ultrasonic waves , 2014 .

[20]  R. Weaver,et al.  Entrainment and stimulated emission of ultrasonic piezoelectric auto-oscillators. , 2007, The Journal of the Acoustical Society of America.

[21]  J. Michaels,et al.  A methodology for structural health monitoring with diffuse ultrasonic waves in the presence of temperature variations. , 2005, Ultrasonics.

[22]  Olivier Durand,et al.  Small crack detection in cementitious materials using nonlinear coda wave modulation , 2014 .

[23]  Eric Larose,et al.  A review of ultrasonic Coda Wave Interferometry in concrete , 2013 .

[24]  R. Weaver,et al.  Coda-wave interferometry in finite solids: recovery of P-to-S conversion rates in an elastodynamic billiard. , 2003, Physical review letters.

[25]  Massimo Ruzzene,et al.  Extracting guided waves from cross-correlations of elastic diffuse fields: applications to remote structural health monitoring. , 2010, The Journal of the Acoustical Society of America.

[26]  Olivier Durand,et al.  Study of stress-induced velocity variation in concrete under direct tensile force and monitoring of the damage level by using thermally-compensated Coda Wave Interferometry. , 2012, Ultrasonics.

[27]  Olivier Durand,et al.  Validation of a thermal bias control technique for Coda Wave Interferometry (CWI). , 2013, Ultrasonics.

[28]  Laurence J. Jacobs,et al.  Damage detection in concrete using coda wave interferometry , 2011 .

[29]  Jean-François Thimus,et al.  Use of ultrasonics to follow crack growth , 1998 .