Ms. Khalada Perveen Profile

Khalada Perveen

at Univ of Manitoba

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Proceedings Article | 6 April 2012 Paper

Inductively coupled corrosion potential sensor for steel reinforced concrete with time domain gating interrogation

D. Thomson, K. Perveen, G. Bridges, S. Bhadra

Proceedings Volume 8345, 83454P (2012) https://doi.org/10.1117/12.921332

KEYWORDS: Sensors, Corrosion, Diodes, Capacitance, Electrodes, Sensing systems, Electronics, Inductance, Circuit switching, Computer engineering

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Corrosion is a major problem for civil infrastructure and is one of the leading factors in infrastructure deterioration. Techniques such as half-cell potential can be used to periodically monitor corrosion, but can be difficult to reliably interpret. Wired systems have large installation cost and long-term reliability issues due to wire corrosion. In this paper an embedded inductively coupled coil sensor able to monitor the corrosion potential of reinforcement steel in concrete is presented. The sensor is based on a coil resonator whose resonant frequency changes due to the corrosion potential being applied across a parallel varactor diode. The corrosion potential can be monitored externally using an inductively coupled coil. An accelerated corrosion test shows that it can measure corrosion potentials with a resolution of less than 10 mV. This sensor will detect corrosion at the initiation stage before observable corrosion has taken place. The wireless sensor is passive and simple in design, making it an inexpensive, battery less option for long-term monitoring of the corrosion potential of reinforcing steel.

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