Unpowered wireless corrosion sensor for steel reinforced concrete

Prototype sensors have been developed to detect the onset of corrosion in steel reinforced concrete using non-invasive techniques. These sensors are designed to be extremely simple and low cost. The sensors are embedded in the concrete and are powered and interrogated through the use of inductively coupled magnetic fields. New analysis and data processing techniques show that the sensor can provide useful information about the current extent of corrosion.