Characterization of anisotropic materials with the Laser-Ultrasonic technique using the “in plane” and the “out of plane” measurements of the sample surface displacement

Bescond, Christophe; Massabki, Maroun; Bertrand, Lionel
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1457
Academic Journal
The progress of lasers for the generation as for the detection of ultrasonic waves opened ways for many applications where measurements need to be contactless and at a distance. For example, the Laser-Ultrasonic technique is promising for the mechanical characterization of anisotropic materials. Nevertheless, the signal processing as the data analysis becomes more complex than in the case of the classical technique that uses piezoelectric transducers. The generation and detection being punctual on the sample surface, the measured ultrasonic wave velocities correspond to group velocities. That point complicates the elastic tensor determination. In that work, a well adapted formulation is presented and is applied to characterize anisotropic materials, in particular, a composite material where its structure complicates the problem. The localization of wave front arrivals becomes intricate due to the inhomogeneity of such materials regarding their multi-layered structures and the large bandwidth of the acoustical source. In this work, we present measurements of waveforms obtained with a heterodyne laser interferometer that allows us to measure the “in-plane” and the “out-of-plane” displacements of the sample surface. Both measurements authorize a better localization of wave front arrivals. Interests of this technique are underlined. © 2000 American Institute of Physics.


Related Articles

  • High temperature sound velocity measurement with piezoelectric transducers Alves, J. Maia; Vallera, A.M.; Vallera, A. M. // Review of Scientific Instruments;Jan1998, Vol. 69 Issue 1, p130 

    Develops a technique for ultrasonic velocity measurement at high temperature using piezoelectric transducers. Existence of high temperature bond between sample and buffer; Application of the method in iron-silicon single crystals; Disadvantage of the technique.

  • Finite element predictions of guided ultrasonic wave fields generated by piezoelectric transducers. Marty, P. N.; Lowe, M. J. S.; Cawley, P. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p829 

    The relative generation efficiencies of the A0 and S0 modes in a steel plate excited by a piezoelectric disc bonded to the plate surface is investigated as a function of the thickness of the bond between the disc and the plate. Finite element predictions are confirmed by experimental...

  • Acousto-optic study of the unusual cases of reflection of bulk elastic waves in a paratellurite crystal. D'yakonov, E.; Voloshinov, V.; Polikarpova, N. // Acoustical Physics;Jan2012, Vol. 58 Issue 1, p107 

    The propagation and reflection of bulk ultrasonic waves in a paratellurite crystal have been investigated by the acousto-optic method. Simultaneous excitation of two acoustic waves by one piezoelectric transducer has been observed in a cell of complex, specially chosen configuration. Maximally...

  • Specific features of ultrasonic flaw detection in studies of the distribution of structural fragments in strongly inhomogeneous media. Bekhterev, A. N. // Russian Journal of Nondestructive Testing;Feb2007, Vol. 43 Issue 2, p77 

    Results of ultrasonic testing of a building’s multilayer reinforced-concrete foundation that is encased in metallic fixed shutters are analyzed. Testing is conducted according to the impact-echo method in the frequency range 0.02–1.0 MHz to experimentally determine the average...

  • Phased Array for Guided Waves and Crack Detection for Airframe Structures. Banchet, J.; Sicard, R.; Chahbaz, A.; Goyette, J. // AIP Conference Proceedings;2004, Vol. 700 Issue 1, p826 

    Linear phased arrays approach is proposed in comb configuration to excite guided wave modes either with a toneburst or a spike-pulse on relatively thin airframe skin and lap joint structures. In a first instance, it is shown that, through time-delay adjustments, the generated guided modes could...

  • Broadening the potential bandwidth of piezoelectric transducers by partial depolarization. Hariti, Sid Ahmed; Holé, Stéphane; Lewiner, Jacques // Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p4037 

    Elastic waves are used more and more in a nondestructive way to probe the physical properties of materials. The resolution of the images or the accuracy of the measurements is directly associated with the ultrasonic signal bandwidth and amplitude a system can generate or detect. The authors...

  • Heating of the phantom of a biological tissue by a phase conjugate ultrasonic beam. Brysev, A.; Bunkin, F.; Klopotov, R.; Krutyansky, L. // JETP Letters;Dec2012, Vol. 96 Issue 8, p541 

    The local heating of an absorbing medium by an ultrasonic beam with a conjugate wave front has been experimentally demonstrated. Plastisol, which is a polymeric material close in acoustic properties to biological tissue, is used as the medium. An ultrasonic heating of 7.2°C has been obtained...

  • Shear Horizontal Ultrasonic Waves Excited by Piezoelectric Fiber Patches. Köhler, Bernd; Gaul, Tobias; Lieske, Uwe; Schubert, Frank // AIP Conference Proceedings;2016, Vol. 1706 Issue 1, p1 

    A new type of transducer for piezoelectric generation of horizontally polarized shear waves was proposed recently. The wave field of such a Shear Horizontal Piezoelectric Fibre Patch (SHPFP) is now analyzed by 3D laser vibrometry, providing the first experimental prove that the SHPFP is an...

  • Influence of a low flow rate on an acoustic cavitation bubble cloud. Seck, A.; Inserra, C.; Ollivier, S.; Bra, J.-C.; Blanc-Benon, P. // AIP Conference Proceedings;2015, Vol. 1685 Issue 1, p1 

    The impact of a low flow rate on a acoustic cavitation bubble cloud is studied experimentally and analytically. Experimentally, a bubble cloud induced by an ultrasonic wave is submitted to several low flow rates. An annular piezoelectric transducer is used to generate the ultrasonic acoustic...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics