Structural Health Monitoring (SHM) is playing an important role in the evaluation process of structural integrity of concrete structures.
Electromechanical Impedance (EMI) sensing approach could be an effective alternative experimental approach for the damage detection of concrete structures even at very early-age stages.
The wireless monitoring system proposed in the present work, denoted as Wireless impedance or Admittance Monitoring System (WiAMS), retains the benefits of low-budgeted EMI-based monitoring system but is not limited by the data acquisition device sampling rate in conventional EMI monitoring systems.
This ends up achieved by utilizing a credit card-sized Raspberry Pi single-board computer capable of transferring data without a base station, and can perform processing-hungry operations like video streaming by adding the WiAMS device to the home network and perform SHM.
Moreover, the use of the Raspberry Pi expands the available hardware interfaces making the sensing device to be ready not only as an SHM control unit, but also as a base station for other sensing platforms like motion with video, audio or environmental sensors.
WiAMS, as a whole, additionally offers features such as remote control, high processing power, wireless data upload to an SQL database, email notifications, scheduled and iterative impedance (or admittance) measurements and frequency spans from 5kHz to 300 kHz with resolution down to 1 Hz.
The proposed WiAMS is successfully applied on various concrete specimens detecting damage even in very early-age stages by establishing a damage identification index based on extreme value statistics.