Abstract
An heterodyne optical probe, which permits one to measure out-of-plane and in-plane displacements at the surface of a specimen excited by ultrasound is presented. The principles at the basis of the two modes of operation are explained and the sensitivities for in-plane and out-of-plane detection are analyzed. The optical layout of the probe and the schematic of its demodulation circuitry are presented. Its accuracy is tested with Rayleigh surface waves. Examples of application to laser-generated Rayleigh and Lamb waves are also presented.
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J. -P. Monchalin, Optical detection of ultrasoundIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control UFFC-33(5):485–489 (1986).
J. -P. Monchalin, R. Héon, and N. Muzak, Evaluation of ultrasonic inspection procedures by field mapping with an optical probe.Can. Metallurgical Quart. 25:247–252 (1986).
B. C. Moss and C. B. Scruby, Investigation of ultrasonic transducers using optical techniques,Ultrasonics 26:179–188 (1988).
J. C. Baboux, Interferometric Measurements of Transient Ultrasonic Fields: Application to Hydrophone Calibration, Proceedings of IEEE Ultrasonics Symposium, IEEE Press, Chicago, Illinois, October 2–5, 1988, pp. 857–861.
R. L. Jungerman, B. T. Khuri-Yakub, and G. S. Kino, Characterization of surface defects using a pulsed acoustic laser probe,Appl. Phys. Lett. 44:392–393 (1984).
D. A. Hutchins, F. Nadeau, and P. Cielo, A pulsed photoacoustic investigation of mode conversion,Can. J. Phys. 64:1334–1340 (1986).
C. B. Scruby, R. J. Dewhurst, D. A. Hutchins, and S. B. Palmer, Laser generation of ultrasound in metals, inResearch Techniques in Nondestructive Testing (Vol. 5), R. S. Sharpe, ed. (Academic Press, New York, 1982), pp. 281–327.
D. A. Hutchins, Mechanisms of pulsed photoacoustic generation,Can. J. Phys. 64:1247–1264 (1986).
J. -D. Aussel and J. -P. Monchalin, Precision acoustic velocity measurement and elastic constant determination by laserultrasonics,Ultrasonics 27:165–177 (1989).
R. J. Dewhurst, C. Edwards, A. D. W. McKie, and S. B. Palmer, Estimation of the thickness of thin metal sheet using laser generated ultrasound,Appl. Phys. Lett. 51(14):1066–1068 (1987).
D. A. Hutchins and K. Lundgren, Quantitative studies of Lamb waves in thin materials using laser techniques, inReview of Progress in Quantitative NDE (Vol. 7A), D. O. Thompson and D. E. Chimenti, eds. (Plenum Press, New York, 1988), pp. 79–83.
J. -P. Monchalin, J. -D. Aussel, P. Bouchard, and R. Héon, Laser-ultrasonics for industrial applications,” inReview of Progress in Quantitative NDE (Vol. 7B), D. O. Thompson and D. E. Chimenti, ed. (Plenum Press, New York, 1988), pp. 1607–1614.
J. -P. Monchalin, J. -D. Aussel, R. Héon, J. F. Bussière, P. Bouchard, J. Guèvremont, and C. Padioleau, Laser-Ultrasonics Developments towards Industrial Applications, Proceedings of IEEE Ultrasonics Symposium, IEEE Press, Chicago, Illinois, October 2–5, 1988, pp. 1041–1044.
J. -P. Monchalin, Heterodyne interferometer laser probe to measure continuous ultrasonic displacements,Rev. Sci. Inst. 56:543–546 (1985).
L. E. Drain,The Laser Doppler Technique, (J. Wiley, New York, 1980), Chap. 5.
D. Joyeux and S. Lowenthal, Real-time measurement of angström order transverse displacement or vibrations by use of laser speckle,Opt. Commun. 4:108–112 (1971).
R. Dändliker and J. -F. Willemin, Measuring microvibrations by heterodyne speckle interferometry,Opt. Lett. 6:165–167 (1981).
K. Iijima, Y. Tsuzuki, Y. Hirose, and M. Akiyama, Laser Interferometric Measurement of the Vibration Displacements of a Plano-Convex AT-Cut Quartz Crystal Resonator, Proceedings of the IEEE, March 1976, pp. 386–387.
A. Sarrafzadeh-Khoee and J. C. Duke, Jr., Small in-plane/out-of-plane ultrasonic displacement measurement using laser-speckle interferometry,Exp. Techn. 10:18–21 (1986).
A. D. W. McKie and J. W. Wagner, Optical sensing of in-plane ultrasonic transients,Appl. Phys. Lett. 53:1043–1044 (1988).
D. Joyeux, Real-time measurement of very small transverse displacements of diffuse objects by random Moiré: Theory,Appl. Opt. 15:1241–1247 (1976).
I. A. Viktorov,Rayleigh and Lamb Waves (Plenum Press, New York, 1967).
A. M. Aindow, R. J. Dewhurst, and S. B. Palmer, Laser-generation of directional surface acoustic wave pulses in metals,Opt. Commun. 42:116–120 (1982).
J. -D. Aussel and J. -P. Monchalin, Study of surface acoustic wave dispersion using laser-ultrasound and application to thickness measurement, inReview of Progress in Quantitative NDE (Vol. 8), D. O. Thompson and D. E. Chimenti, eds. (Plenum Press, New York, 1989), pp. 535–542.
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Monchalin, J.P., Aussel, J.D., Héon, R. et al. Measurement of in-plane and out-of-plane ultrasonic displacements by optical heterodyne interferometry. J Nondestruct Eval 8, 121–133 (1989). https://doi.org/10.1007/BF00565636
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DOI: https://doi.org/10.1007/BF00565636