scholarly journals Dense capacitive sensor array for monitoring distortion-induced fatigue cracks in steel bridges

2018 ◽  
Author(s):  
Xiangxiong Kong ◽  
Jian Li ◽  
William Collins ◽  
Caroline R. Bennett ◽  
Hongki Jo ◽  
...  
Keyword(s):  
Sensor Array ◽  
Fatigue Cracks ◽  
Capacitive Sensor ◽  
Steel Bridges

scholarly journals An Automated Sensing System for Steel Bridge Inspection Using GMR Sensor Array and Magnetic Wheels of Climbing Robot

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Rui Wang ◽  
Youhei Kawamura
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Giant Magnetoresistance ◽  
Sensor Array ◽  
Fatigue Cracks ◽  
Vertical Component ◽  
Steel Bridges ◽  
Steel Bridge ◽  
Sensing System ◽  
Gmr Sensor

Corrosion is one of the main causes of deterioration of steel bridges. It may cause metal loss and fatigue cracks in the steel components, which would lead to the collapse of steel bridges. This paper presents an automated sensing system to detect corrosion, crack, and other kinds of defects using a GMR (Giant Magnetoresistance) sensor array. Defects will change the relative permeability and electrical conductivity of the material. As a result, magnetic field density generated by ferromagnetic material and the magnetic wheels will be changed. The defects are able to be detected by using GMR sensor array to measure the changes of magnetic flux density. In this study, magnetic wheels are used not only as the adhesion device of the robot, but also as an excitation source to provide the exciting magnetic field for the sensing system. Furthermore, compared to the eddy current method and the MFL (magnetic flux leakage) method, this sensing system suppresses the noise from lift-off value fluctuation by measuring the vertical component of induced magnetic field that is perpendicular to the surface of the specimen in the corrosion inspection. Simulations and experimental results validated the feasibility of the system for the automated defect inspection.

5×5 CMOS capacitive sensor array for detection of the neurotransmitter dopamine

2010 ◽  
Vol 26 (3) ◽  
pp. 1093-1097 ◽  
Author(s):  
Michael S.-C. Lu ◽  
Yi-Chung Chen ◽  
Po-Chiun Huang
Keyword(s):  
Sensor Array ◽  
Capacitive Sensor

scholarly journals Driver Alertness Detection Research Using Capacitive Sensor Array

2001 ◽  
Author(s):  
Philip W. Kithil ◽  
Roger D. Jones ◽  
John Mccuish
Keyword(s):  
Sensor Array ◽  
Capacitive Sensor

Floor-Beam Web Cutout Shape Analysis to Improve the Fatigue Resistance in Orthotropic Steel Bridge Decks

2010 ◽  
Vol 452-453 ◽  
pp. 161-164 ◽  
Author(s):  
Chun Sheng Wang ◽  
Qin Zhang ◽  
Tao Zhang ◽  
Ya Cheng Feng
Keyword(s):  
Bridge Deck ◽  
Fatigue Cracks ◽  
Bridge Decks ◽  
Steel Bridges ◽  
Steel Bridge ◽  
Analysis Model ◽  
Critical Question ◽  
Static Test ◽  
Orthotropic Steel Decks ◽  
Steel Orthotropic Deck

The modern steel orthotropic decks have been used in steel bridges for 60 years all over the world because of its super structural advantages. Recently, more bridge owners, engineers and researchers pay more attention to the fatigue problem of orthotropic steel decks for a large number of fatigue cracks found in steel bridges. For example, bridge engineers have detected hundreds of fatigue cracks in steel orthotropic deck on the 888-meter long box girder of Humen Bridge only ten years after opening to traffic. How to design or repair the fatigue details in orthotropic steel decks is the critical question to be solved at first step. In current paper, the elaborate numerical analysis model of the orthotropic steel bridge decks was developed using ANSYS software with different floor-beam web cutouts shapes, such as conventional ellipse, circular, trapezoid and Haibach web cutouts. The finite element models were calibrated by static test of one full size orthotropic steel bridge deck model. According to the analysis results, it should select the rational cutout shapes based on actual load and structural conditions in steel bridge deck design and strengthening.

Capacitive sensor array for fingerprint recognition

2016 ◽  
Author(s):  
Y. E. Jeon ◽  
Y. J. Lee ◽  
M. K. Jang ◽  
B. M. Seo ◽  
I. H. Kang ◽  
...  
Keyword(s):  
Sensor Array ◽  
Capacitive Sensor ◽  
Fingerprint Recognition

A Reconfigurable Multichannel Capacitive Sensor Array Interface

2011 ◽  
Vol 60 (9) ◽  
pp. 3214-3221 ◽  
Author(s):  
Efstathios D. Kyriakis-Bitzaros ◽  
Nikolaos A. Stathopoulos ◽  
Spyridon Pavlos ◽  
Dimitrios Goustouridis ◽  
Stavros Chatzandroulis
Keyword(s):  
Sensor Array ◽  
Capacitive Sensor
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