TY  - JOUR
A1  - Laflamme, Simon
A1  - Kollosche, Matthias
A1  - Connor, Jerome J.
A1  - Kofod, Guggi
T1  - Robust flexible capacitive surface sensor for structural health monitoring applications
JF  - Journal of engineering mechanics
N2  - Early detection of possible defects in civil infrastructure is vital to ensuring timely maintenance and extending structure life expectancy. The authors recently proposed a novel method for structural health monitoring based on soft capacitors. The sensor consisted of an off-the-shelf flexible capacitor that could be easily deployed over large surfaces, the main advantages being cost-effectiveness, easy installation, and allowing simple signal processing. In this paper, a capacitive sensor with tailored mechanical and electrical properties is presented, resulting in greatly improved robustness while retaining measurement sensitivity. The sensor is fabricated from a thermoplastic elastomer mixed with titanium dioxide and sandwiched between conductive composite electrodes. Experimental verifications conducted on wood and concrete specimens demonstrate the improved robustness, as well as the ability of the sensing method to diagnose and locate strain.
KW  - Strain gages
KW  - Structural health monitoring
KW  - Monitoring
KW  - Probe instruments
KW  - Strain gauge
KW  - Structural health monitoring
KW  - Strain monitoring
KW  - Capacitive sensor
KW  - Dielectric polymer
KW  - Stretchable sensor
KW  - Flexible membrane
KW  - Sensing skin
Y1  - 2013
U6  - https://doi.org/10.1061/(ASCE)EM.1943-7889.0000530
SN  - 0733-9399
SN  - 1943-7889
VL  - 139
IS  - 7
SP  - 879
EP  - 885
PB  - American Society of Civil Engineers
CY  - Reston
ER  - 
TY  - JOUR
A1  - Pilz, Marco
A1  - Isken, Marius Paul
A1  - Fleming, Kevin
A1  - Orunbaev, Sagynbek
A1  - Moldobekov, Bolot
T1  - Long- and short-term monitoring of a dam in response to seasonal changes and ground motion loading
BT  - the test case of the Kurpsai Dam, Western Kyrgyz Republic
JF  - Pure and applied geophysics : PAGEOPH ; continuation of Geofisica pura e applicata
N2  - An experimental multi-parameter structural monitoring system has been installed on the Kurpsai dam, western Kyrgyz Republic. This system consists of equipment for seismic and strain measurements for making longer- (days, weeks, months) and shorter- (minutes, hours) term observations, dealing with, for example seasonal (longer) effects or the response of the dam to ground motion from noise or seismic events. Fibre-optic strain sensors allow the seasonal and daily opening and closing of the spaces between the dam's segments to be tracked. For the seismic data, both amplitude (in terms of using differences in amplitudes in the Fourier spectra for mapping the modes of vibration of the dam) and their time-frequency distribution for a set of small to moderate seismic events are investigated and the corresponding phase variabilities (in terms of lagged coherency) are evaluated. Even for moderate levels of seismic-induced ground motion, some influence on the structural response can be detected, which then sees the dam quickly return to its original state. A seasonal component was identified in the strain measurements, while levels of noise arising from the operation of the dam's generators and associated water flow have been provisionally identified.
KW  - Structural health monitoring
KW  - Dam engineering
KW  - Operational and environmental effects
KW  - Strong-motion
KW  - Strain
KW  - Elastic response
KW  - Kurpsai dam
Y1  - 2021
U6  - https://doi.org/10.1007/s00024-021-02861-5
SN  - 0033-4553
SN  - 1420-9136
VL  - 178
IS  - 10
SP  - 4001
EP  - 4020
PB  - Birkhäuser
CY  - Basel
ER  -