Wireless threshold sensors for detecting corrosion in reinforced concrete structures

Dickerson, Nathan P.; Andringa, Matthew M.; Puryear, John M.; Wood, Sharon L.; Neikirk, Dean P.

doi:10.1117/12.658711

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The sensors in Slab 1 were fabricated with 26-gauge (0.40-mm diameter) steel wire and the sensors in Slab 2 were fabricated with 21-gauge (0.72-mm diameter) steel wire. Tests of sections of steel wires submerged in saltwater had indicated that smaller-diameter wires corroded in a shorter period of time than did larger-diameter wires (1, 2), and these slabs were designed to determine if different corrosion thresholds could be detected for embedded sensors by varying the size of the steel sensing wire (2). There was no electrical connection between the sensing wires and the top layer of reinforcement in Slabs 1 and 2.…”

Section: Long-term Exposure Testsmentioning

confidence: 99%

Resonant Sensors for Detecting Corrosion in Concrete Bridges

Yousef

Pasupathy

Wood³

et al. 2010

Transportation Research Record: Journal of the Transportation R

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A passive sensor platform was developed to detect the onset of corrosion in concrete bridge decks. The term “passive” is used to describe the sensors because they do not include onboard processing capabilities or sources of power. The sensors are powered and interrogated in a wireless manner by measuring the impedance through an external reader coil, which is magnetically coupled to resonant circuits within the sensor. The sensors are designed to be embedded in a concrete bridge during construction and interrogated periodically over its service life. Reinforced concrete slabs were subjected to long-term exposure tests to demonstrate the reliability of the prototype sensors. The middle region of each slab was exposed to alternating moisture cycles with saltwater. Sensors in this region indicated that threshold amounts of corrosion occurred, whereas sensors located in regions that were not exposed to saltwater indicated the absence of corrosion. At the conclusion of the tests, the sensor readings were confirmed by removing the concrete cover and examining the condition of the embedded reinforcement. One flaw in the initial design of the sensors, however, was that the transducing element (a corroding steel wire) passed through the epoxy potting that protected the circuit components. This configuration provided a pathway for contaminants to infiltrate the sensors, causing corrosion. To improve the durability of the passive sensors, a new configuration is being developed in which the corroding element is physically isolated from the resonant circuits within the sensor.

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Section: Long-term Exposure Testsmentioning

confidence: 99%

Resonant Sensors for Detecting Corrosion in Concrete Bridges

Yousef

Pasupathy

Wood³

et al. 2010

Transportation Research Record: Journal of the Transportation R

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“…Recent embedded sensors have been used either to determine damaging conditions for corrosion, or to measure degradation response to damaging conditions. Wireless threshold sensors were studied by Dickerson, et al [18], in which a sensing steel wire component in a wireless passive sensor was interrogated with an inductively coupled magnetic monitor to determine the corrosion damage of steel in concrete test structures. Corrosion of the wire disrupted the electrical connection and caused the sensor signal to fail (i.e.…”

Section: Introduction To Wireless Corrosion Sensorsmentioning

confidence: 99%

Corrosion Sensors: II. Wireless Miniature Corrosion

Smyrl

2014

ECS Trans.

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The research reported here will focus on a miniature battery system that is inactive as assembled (“off”). It is activated when a damaging fluid flows into the inter-electrode separator (“on”). In the “on” state, it powers a wireless sensor that transmits a signal to the base station monitor to announce that corrosion conditions have been created at the location of the battery – sensor. Further, the battery-sensor powered the measurement of the time-to-failure (TTF) of a corroding specimen that was initiated when the fluid arrived (on), and ended when the specimen failed (off). The on/off action is a “large” signal that is insensitive to electrical noise from the ambient surroundings.

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“…Passive, wireless corrosion sensors have been developed to the early detection of corrosion using non invasive techniques and have been proved effective in monitoring localized defect [1][2][3][4][5] . The passive wireless sensors are embedded in concrete, and interrogated by inductively coupled magnetic fields to determine if a corrosion threshold has been reached.…”

Section: Introductionmentioning

confidence: 99%

Magneto-inductive waveguide as a passive wireless sensor net for structural health monitoring

Chen

Munukutla

Pasupathy

et al. 2010

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010

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This paper summarizes ongoing work to develop low-cost, wireless, resonant sensor nets that can be used to monitor corrosion in infrastructure systems. A magnetically coupled sensor array is analyzed using a circuit model. The array acts as a magneto-inductive waveguide and the impedance discontinuities caused by corrosion (or other defects) lead to reflection. The relationship between the relative position of defects and pass band ripples is investigated, providing a technique to determine the location of targets. A configuration for increased sensitivity and a method for defect localization are presented.

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Wireless threshold sensors for detecting corrosion in reinforced concrete structures

Cited by 8 publications

References 3 publications

Resonant Sensors for Detecting Corrosion in Concrete Bridges

Resonant Sensors for Detecting Corrosion in Concrete Bridges

Corrosion Sensors: II. Wireless Miniature Corrosion

Magneto-inductive waveguide as a passive wireless sensor net for structural health monitoring

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