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Interpretation of Auld's electromechanical reciprocity relation via a one-dimensional example
Informa UK Limited - Tập 5 - Trang 147-155 - 1994
The electromechanical reciprocity relation is interpreted through application to
a model problem, the reflection and transmission of ultrasound at a thin layer.
The results for this simple problem illustrate how the reciprocity formalism
allows the effects of transducer efficiency and phase, ultrasonic propagation to
and from the flaw, and ultrasonic interaction with the flaw to be systematically
...
A Study of Wood Inspection by Infrared Thermography, Part I: Wood Pole Inspection by Infrared Thermography
Informa UK Limited - Tập 13 - Trang 1-12 - 2001
Wood poles are among the main components of electrical distribution systems.
They have to be replaced every 20—30 years due to wood decay. To reduce costs,
utilities need an efficient nondestructive tool to determine the appropriate
replacement time. Different techniques exist for this purpose, such as X- or
gamma-ray tomography, indentation, and methods based on measurement of
electrical conducti...
Eddy Current Testing of Thin Layers Using Co-planar Coils
Informa UK Limited - Tập 12 - Trang 53-64 - 2013
A new eddy current technique using a co-planar coil configuration (ECCPC
technique) has been developed and tested quantitatively in the laboratory and
under real conditions in a nuclear reactor tank to detect thin resistive and/ or
magnetic layers on fuel rods. First a short description of the theoretical model
is given, followed by a number of model studies comparing conventional co-axial
loops w...
DGS diagrams and frequency response curves for a flat-bottom hole: A model-based approach
Informa UK Limited - Tập 3 - Trang 201-219 - 1991
Recently, we have developed analytical scattering models for predicting the
pulse-echo response of a flat-bottom hole in both contact and immersion testing.
Here, we present the results of a series of experimental validations of the
immersion case model. It is shown that the model can be used to develop
distance-gain-size (DGS) curves and frequency response curves that compare
favorably with exper...
Ultrasonic Measurement of Stress Using a Rotating EMAT
Informa UK Limited - Tập 12 - Trang 217-240 - 2001
The acoustic birefringence method is primarily used to measure differences of
principal stresses in regions where principal stresses coincide with material
symmetry axes. To determine the differences of principal stresses also requires
knowledge of the unstressed birefringence at the measurement locations.
Consequently, variability in texture can introduce errors in stress
determination. In contra...
Nonlinear Elastic Wave Spectroscopy (NEWS) Techniques to Discern Material Damage, Part II: Single-Mode Nonlinear Resonance Acoustic Spectroscopy
Informa UK Limited - Tập 12 Số 1 - Trang 31-42 - 2000
A unified constrained inversion model for ultrasonic flaw sizing
Informa UK Limited - Tập 1 - Trang 77-97 - 1989
Equivalent flaw sizing using ultrasonic waves is an approach whereby shape and
orientation information of a defect are obtained in terms of a best-fit simple
geometry that is able to represent the major aspects of the flaw. Separate
examples of this approach have previously been developed for volumetric flaws
and cracks using the Born and Kirchhoff approximations, respectively. Here,
these separat...
Microwave diagnosis of low-density fiberglass composites with resin binder
Informa UK Limited - - 1996
Transient fields of pulsed transducers in solids
Informa UK Limited - Tập 7 - Trang 31-53 - 1995
The radiation and propagation of elastic waves in solid media are of fundamental
importance in ultrasonic NDE. Due to the limitation of analytical approaches,
numerical procedures are most appropriate for solving the governing equations.
In this paper, the finite element method is used to predict the transient fields
of pulsed transducers in a solid medium with axisymmetric geometry. Comparisons
w...
Variable geometry capacitive probes for multipurpose sensing
Informa UK Limited - Tập 1 - Trang 111-132 - 1989
A capacitive array for robotic proximity and feature sensing has been designed,
modeled, and tested. The basic probe consists of alternating metallic strip
electrodes. One set of strips makes up the drive plate. The other set consists
of tiny receivers. Both sum and differential modes of operations are used to
allow one to detect proximity and features, respectively. Modeling has
encompassed calcu...
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