Connecting to concrete: wireless monitoring of chloride ions in concrete structures

Yawar Abbas, Bas ten Have, Gerrit I. Hoekstra, Arjan Douma, Douwe de Bruijn, Wouter Olthuis, Albert van den Berg

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    8 Citations (Scopus)
    1 Downloads (Pure)


    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
    Original languageUndefined
    Title of host publicationEurosensors 2015
    Number of pages4
    Publication statusPublished - 2015
    EventEurosensors XXIX 2015 - Freiburg, Germany
    Duration: 6 Sep 20159 Sep 2015

    Publication series

    PublisherElsevier Ltd
    ISSN (Print)1877-7058
    ISSN (Electronic)1877-7058


    ConferenceEurosensors XXIX 2015


    • EWI-26725
    • IR-99202
    • METIS-315544

    Cite this