@inproceedings{3e663a97fc0b4e78a4716f22ce28d077,
title = "Connecting to concrete: wireless monitoring of chloride ions in concrete structures",
abstract = "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",
keywords = "EWI-26725, IR-99202, METIS-315544",
author = "Yawar Abbas and {ten Have}, Bas and Hoekstra, {Gerrit I.} and Arjan Douma and {de Bruijn}, Douwe and Wouter Olthuis and {van den Berg}, Albert",
note = "10.1016/j.proeng.2015.08.827 ; null ; Conference date: 06-09-2015 Through 09-09-2015",
year = "2015",
doi = "10.1016/j.proeng.2015.08.827",
language = "Undefined",
series = "Eurosensors",
publisher = "Elsevier",
pages = "965--968",
booktitle = "Eurosensors 2015",
}