Abstract
A new electromagnetic acoustic transducer (EMAT) is developed that measures velocities and absolute surface displacements in-plane and plane-normal to the direction of wave propagation. This transducer is flexible in shape and design to conform with irregular surfaces and has unique characteristics of nonresonant frequency response. Tests show that the sensitivity of this EMAT can be increased by increasing the applied magnetic field. Because this transducer is mode selective and nonresonent, its response can be related uniquely to the wave motion. This property is highly desirable for research purposes, though generally not wanted in field monitoring situations.
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References
A. Erhard, J. Kutzner and H. Wustenburg, inProc. Int. Symp. on New Methods of Nondestructive Testing of Materials in Nuclear Eng. (Deutsche Gesellschoff fur Zerstorungsfreie Prefung, e.v., Dortmund, W. Germany, 1976).
O. Buck, W. J. Pardee, and A. Arora, to appear.
W. J. Pardee and R. B. Thompson,J. Nondestr. Eval. 1:157 (No. 3): (1980).
A. N. Ceranoglu and Y. H. Pao,J. Appl. Mech. 48:125 (1981).
N. A. Haskell and K. C. Thomson,Bull. Seism. Soc. Am. 62:675 (1972).
W. J. Pardee,J. Acoust. Soc. Am. 70:110 (1981).
R. O. Claus,IEEE Trans. Sonics and Ultrasonics SU-27:93 (1980).
C. H. Palmer and R. E. Green, Jr., Proc. 23rd Sagamore Army Mat. Res. Conf. on Nondestructive Characterization of Mats., Raquette Lakes, N.Y., 1976.
F. R. Breckenridge and M. Greenspan,J. Acoust. Soc. Am. 69:1177 (1981).
E. V. Hardway, Jr.,Instruments 26:1186 (1953).
C. F. Vasile and R. B. Thompson,J. Appl. Phys. 50:2583 (1979).
R. B. Thompson and C. M. Fortunko, Quantitative flaw definition, 2nd yr. effort, Rockwell Int. Science Center, Thousand Oaks, Calif. (1976).
A. Arora, R. B. Thompson, and W. J. Pardee, Patent Disclosure No. 80SC62, (Rockwell Int. Science Center, Thousand Oaks, Calif., 1980).
H. Semat,Fundamentals of Physics (Rinehart, New York, 1957).
R. T. Weidner and R. L. Sells,Elementary Modern Physics (Allyn and Bacon, Boston, 1960).
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Arora, A., Pardee, W.J. Electromagnetic acoustic transducer for in-plane and plane-normal velocity measurements. J Nondestruct Eval 3, 85–91 (1982). https://doi.org/10.1007/BF00568964
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DOI: https://doi.org/10.1007/BF00568964