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Title:
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Applications of TAP-NDE technique to non-contact ultrasonic inspection in tubulars |
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Author:
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Baltazar-Lopez, Martin Eduardo, 1966- |
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Abstract:
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The possibility and feasibility of experimental detection of localized defects in tubes using laser -induced ultrasonic wave approach through Thermo Acousto Photonic Non Destructive Evaluation (TAP -NDE ) and Signal processing through wavelet transform is examined in this research . Guided waves in cylindrical surfaces provide solutions for detection of different defects in the material . Several experiments were conducted to this respect . Wave propagation in both axial and circumferential directions was studied . The dispersive wave propagation of ultrasonic waves in hollow cylinders has been investigated experimentally , primarily for use in non -contact and nondestructive inspections of pipes and tubes . The laser ultrasonic waves propagated in cylindrical waveguides are particularly attractive because of their unique characteristics in the applications of nondestructive evaluation (NDE ) . Contrary to studies making use of only axially symmetric guided waves in hollow cylinders , here are analyzed also nonaxisymmetric waves . The analysis of data is made by using the Gabor wavelet transform . The capability of modeling the guided wave dispersion in hollow cylinders is used in developing guided wave experimental techniques for flaw detection . Good agreement was obtained when comparing the dispersion spectra between theory and experimentation . Measurement of group velocities of guided waves , which are obtained directly from the wavelet transform coefficients , can be used to determine allocation and sizing of flaws . |
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URI:
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http : / /handle .tamu .edu /1969 .1 /1614
http : / /hdl .handle .net /1969 .1 /1614
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Date:
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2005-02-17 |