Journal ArticleDOI
A Novel TDR-Based Coaxial Cable Sensor for Crack/Strain Sensing in Reinforced Concrete Structures
Shishuang Sun,David Pommerenke,James L. Drewniak,Genda Chen,Liang Xue,M.A. Brower,Marina Y. Koledintseva +6 more
TLDR
In this article, a coaxial cable sensor with high sensitivity and high spatial resolution was developed for health monitoring of concrete structures using a time-domain reflectometry (TDR), which was designed based on the topology change of its outer conductor.Abstract:
Novel coaxial cable sensors that feature high sensitivity and high spatial resolution are developed for health monitoring of concrete structures using a time-domain reflectometry (TDR). The new sensor was designed based on the topology change of its outer conductor, which was fabricated with tightly wrapped commercial tin-plated steel spiral covered with solder. The cracks that developed within concrete structures will lead to out-of-contact of local steel spirals. This topology change results in a large impedance discontinuity that can be measured with a TDR. A simplified equivalent transmission line model and numerical full-wave simulations using finite-difference time-domain techniques were used to optimize the sensor design. The sensors under test demonstrated high sensitivity and the capability of multiple-crack detection. A plasma-sprayed coating technique was employed to improve sensor uniformity. Engineering implementation issues, e.g., signal loss, signal postprocessing, and sensor design optimization, were also addressed.read more
Citations
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Journal ArticleDOI
Crack detection and characterization techniques - An overview
TL;DR: In this paper, the authors summarize the knowledge about cracking and its sources, review both existing and emerging methods for crack detection and characterization, and identify the advantages and challenges for these methods.
Proceedings ArticleDOI
Modular and deformable touch-sensitive surfaces based on time domain reflectometry
Raphael Wimmer,Patrick Baudisch +1 more
TL;DR: This paper explores how to extend time domain reflectometry in order to touch-enable thin, modular, and deformable surfaces and devices, and demonstrates how to use this approach to make smart clothing and to rapid prototype touch-sensitive objects of arbitrary shape.
Journal ArticleDOI
Detection of Surface Crack in Concrete Using Measurement Technique With Laser Displacement Sensor
Paritosh Giri,Sergey Kharkovsky +1 more
TL;DR: It is shown that a characteristic response of crack as a sharp distortion of the displacement reading occurs when the laser spot crosses the crack, which proves the repeatability and accuracy of the measurement and shows that this technique can be applied in a real-life scenario.
Journal ArticleDOI
Review of advances in microwave and millimetre-wave NDT&E: principles and applications.
TL;DR: Recent advances in four major areas of microwave and millimetre-wave NDT&E, namely materials characterization, surface crack detection, imaging and sensors are reviewed, and some of the applications in each of these areas are discussed.
Journal ArticleDOI
Microwave Imaging of Subsurface Flaws in Coated Metallic Structures Using Complementary Split-Ring Resonators
TL;DR: In this paper, the use of complementary split-ring resonators in the microwave regime for imaging subsurface flaws in coated metallic structures was investigated, and both transmission and reflection coefficients were studied to build images using magnitude and phase information.
References
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Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review
TL;DR: A review of the technical literature concerning the detection, location, and characterization of structural damage via techniques that examine changes in measured structural vibration response is presented in this article, where the authors categorize the methods according to required measured data and analysis technique.
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TL;DR: The Signal Integrity-Simplified as discussed by the authors is a complete guide to understand and design for signal integrity, which offers a comprehensive, easy-to-follow look at how physical interconnects affect electrical performance.
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Fundamentals of Durable Reinforced Concrete
TL;DR: In this article, a framework for Durability by Specification is proposed, based on Probabilistic Approach to Durability Design (PADD) and a probabilistic approach to design.
Proceedings ArticleDOI
Skin effects models for transmission line structures using generic SPICE circuit simulators
B.K. Sen,R.L. Wheeler +1 more
TL;DR: In this article, a recipe has been developed to model the skin effect for various transmission line structures and the final circuit structure to model this effect can be used with a generic SPICE circuit simulator.