Journal ArticleDOI
The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers
D. N. Alleyne,Peter Cawley +1 more
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TLDR
In this article, the development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described.Abstract:
The development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described. It is shown that the axisymmetricL(0,2) mode at a frequency of about 70 kHz is an attractive mode to use for longdistance propagation. The results show that a ring of piezoelectric length-expander elements can be used to excite theL(0,2) mode and to suppress all the nonaxisymmetric modes. Tests have been carried out both with the piezoelectric elements bonded to the pipe and fabricated into a simple transducer which was clamped against the pipe. The performance of the dry-coupled system was very similar to that of the bonded elements. In pulse echo tests, the noise floor obtained with the dry-coupled system was less than 1% of the amplitude of the propagatingL(0,2) mode. The drycoupled transducers provide a simple, light, readily detachable system for the long-range inspection of pipework.read more
Citations
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Proceedings ArticleDOI
Feature extraction for pipeline defects inspection based upon distributed acoustic fiber optic sensing data
Pengdi Zhang,Abhishek Venketeswaran,Ruishu F. Wright,Kayte M. Denslow,Hessam Babaee,Paul R. Ohodnicki +5 more
TL;DR: In this article , the authors presented a systematic theoretical study of the potential for DAS to be directly coupled with guided ultrasonic waves typically used in conventional acoustic non-destructive evaluation (NDE) methods for real-time pipeline health monitoring.
Journal ArticleDOI
Wall thickness measurement using resonant phenomena of circumferential Lamb waves generated by plural transducer elements located evenly on girth
TL;DR: In this paper, the authors used the resonance of the circumferential Lamb wave generated by a piezoelectric ring-shaped sensor (PS) to measure the pipe wall thickness.
Detection of cracks in long painted or rusted steel beams using ultrasonic rayleigh waves
Udaya B. Halabe,Reynold Franklin +1 more
TL;DR: In this article, the authors used high amplitude 1 MHz Rayleigh waves (generated using high power piezoelectric transducers) to travel long distances in painted and rusted steel members and detect cracks which originate at the surface.
Proceedings ArticleDOI
Time-frequency analysis of Lamb waves for distance and thickness measurement
Hyeon Jae Shin,Sung-Jin Song +1 more
TL;DR: In this paper, a time-frequency analysis was performed by short time Fourier transforms, which revealed the patterns of dispersion that provided relative time-of-flight of each frequency component of received signals.
Dissertation
Design and development of a torsional guided-waves inspection system for the detection and sizing of defects in pipes
TL;DR: In this paper, an inspection system has been designed and developed to verify and visualize the wave propagation phenomenon in both intact and damaged pipes, where Piezoelectric transducers are employed to generate torsional guided waves that could propagate along the tested pipe; and receive reflected signals from encountered features and damages.
References
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Book
Wave Motion in Elastic Solids
TL;DR: In this article, a comprehensive study of elastic wave propagation in solids is presented, ranging from the theory of waves and vibrations in strings to the three-dimensional theory of elastic waves in thick plates.
Journal ArticleDOI
Matrix techniques for modeling ultrasonic waves in multilayered media
TL;DR: This paper presents a review of the main developments of the matrix techniques, and their use in response and modal models, with emphasis on ultrasonics applications.
Journal ArticleDOI
Three‐Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation
TL;DR: In this paper, the propagation of free harmonic waves along a hollow circular cylinder of infinite extent is discussed within the framework of the linear theory of elasticity, and a characteristic equation appropriate to the circular hollow cylinder is obtained by use of the Helmholtz potentials for arbitrary values of the physical parameters involved.
Journal ArticleDOI
Optimization of Lamb wave inspection techniques
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this article, the authors discuss the selection of the appropriate mode and frequency range for different inspection requirements and review the possible methods of excitation, response measurement and signal processing, and show that the presence of defects can be detected reliably from changes in the shape of the received waveform.
Journal ArticleDOI
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more
TL;DR: In this article, it is shown that the L(0, 1) mode, which is comparable to the A0 Lamb wave mode in flat plate, can be generated with acceptable efficiency.
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The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more