TY - GEN
T1 - Connecting to concrete: wireless monitoring of chloride ions in concrete structures
AU - Abbas, Yawar
AU - ten Have, Bas
AU - Hoekstra, Gerrit I.
AU - Douma, Arjan
AU - de Bruijn, Douwe
AU - Olthuis, Wouter
AU - van den Berg, Albert
PY - 2015
Y1 - 2015
N2 - For the first time, chloride ions are measured wirelessly in concrete. The half-cell potential of a silver/silver chloride (Ag/AgCl) electrode, which corresponds to the concentration of chloride ions, is measured wirelessly. The sensor system (the Ag/AgCl and a reference electrode) is embedded in concrete, and a hand-held readout device is used. Wireless communication is achieved by an inductive coupling (reflected-impedance) between the coils of the sensor and the readout. The resonance frequency of the sensor coil changes due to the change in the capacitance of a varactor element connected to Ag/AgCl electrode system. The capacitance of the varactor increases with the increase in chloride ion concentration (20 pF/decade). Furthermore, the capacitance can be reliability measured up to a distance of 35 mm between sensor and readout coil. No battery is needed to power the sensor terminal, which makes it feasible to embed it in concrete structures
AB - For the first time, chloride ions are measured wirelessly in concrete. The half-cell potential of a silver/silver chloride (Ag/AgCl) electrode, which corresponds to the concentration of chloride ions, is measured wirelessly. The sensor system (the Ag/AgCl and a reference electrode) is embedded in concrete, and a hand-held readout device is used. Wireless communication is achieved by an inductive coupling (reflected-impedance) between the coils of the sensor and the readout. The resonance frequency of the sensor coil changes due to the change in the capacitance of a varactor element connected to Ag/AgCl electrode system. The capacitance of the varactor increases with the increase in chloride ion concentration (20 pF/decade). Furthermore, the capacitance can be reliability measured up to a distance of 35 mm between sensor and readout coil. No battery is needed to power the sensor terminal, which makes it feasible to embed it in concrete structures
U2 - 10.1016/j.proeng.2015.08.827
DO - 10.1016/j.proeng.2015.08.827
M3 - Conference contribution
T3 - Eurosensors
SP - 965
EP - 968
BT - Eurosensors 2015
PB - Elsevier
T2 - Eurosensors XXIX 2015
Y2 - 6 September 2015 through 9 September 2015
ER -