A Wireless, Passive Embedded Sensor for Real-Time Monitoring of Water Content in Civil Engineering Materials

Ong, J.B.; You, Zhanping; Mills-Beale, Julian; E, Tan; Pereles, Brandon D.; Ong, Keat Ghee

doi:10.1109/jsen.2008.2007681

Cited by 126 publications

(48 citation statements)

References 15 publications

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“…Polymer-based capacitive-type humidity sensors, for which a change in the RH is associated with a change in the permittivity of the polymer dielectric, usually exhibit a linear response of the capacitance with the RH [23]. LC circuits based on such capacitive-type sensors, together with a coil, have been demonstrated previously [9][10][11]. The humidity sensitive resonance frequency of those sensor circuits was readout in a wireless fashion.…”

Section: Figure 4 A) the Real And B) The Imaginary Parts Of The Impementioning

confidence: 99%

“…The most common capacitive-type humidity sensors use a dielectric material as the active sensing material included in an interdigitated electrode configuration [7,8]. Absorption of water into the dielectric layer changes its permittivity, thus modulating the capacitance (and the resonance frequency if incorporated into a LC resonance sensor) [9][10][11]. Polyelectrolytes represent a family of solid-state electrolytes in which ionic charges are carried by the polymer chains while the counter-ions are condensed around the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

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Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Larsson

Wang

Berggren

et al. 2010

Sensors and Actuators B: Chemical

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Low-cost passive wireless electronic sensor labels glued onto packages are highly desirable since they enable monitoring of the status of the packages for instance along the logistic chain or while stored at a shelf. Such additional sensing feature would be of great value for many producers and vendors, active in e.g. the food or construction industries. Here, we explore a novel concept for wireless sensing and readout, in which the humidity sensitive ionic motion in a polyelectrolyte membrane is directly translated into a shift of the resonance frequency of a resonance circuit. Thanks to its simplicity, the wireless sensor device itself can be manufactured entirely using common printing techniques and can be integrated into a lowcost passive electronic sensor label.

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Section: Figure 4 A) the Real And B) The Imaginary Parts Of The Impementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Larsson

Wang

Berggren

et al. 2010

Sensors and Actuators B: Chemical

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“…The change in permittivity is detected by an interdigital capacitor structure. Capacitive sensors are used in a wide range of sensing applications, for example non-destructive testing (NDT), chemical sensing, bio-sensing [16], humidity and moisture sensing [17], monitoring of curing processes [18], wireless sensing [19] and surface acoustic waves (SAW) [20]. An overview of the most important concepts related to interdigital electrode sensors are available in references [16,[21][22][23][24][25][26].…”

Section: Theorymentioning

confidence: 99%

Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate

et al. 2018

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Environmental monitoring of land, water and air, is an area receiving greater attention because of human health and safety concerns. Monitoring the type of pollution and concentration levels is vital, so that appropriate contingency plans can be determined. To effectively monitor the environment, there is a need for new sensors and sensor systems that suits these type of measurements. However, the diversity of sensors suitable for low, battery powered-and large area sensor systems are limited. We have manufactured and characterized a flexible pH sensor using laser processing and blade coating techniques that is able to measure pH between 2.94 and 11.80. The sensor consists of an interdigital capacitance with a pH sensitive hydrogel coating. Thin sensors can reach 95% of their final value value within 3 min, and are stable after 4 min. Good repeatability was achieved in regard to cycling of the sensor with different pH and multiple measurements from dry state. We have also studied the relation between an interdigital capacitance penetration depth and hydrogels expansion. We believe that our passive sensor is suitable to be used in low power and large area sensor networks.

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“…In the case of asphalt mixtures, the presence of unwanted moisture leads to stripping and debonding of asphalt and aggregate particles. Ong et al (2008) developed a wireless, passive, embedded sensor for real-time monitoring of moisture content in civil engineering materials, such as sands, subgrade soils, and concrete materials. The water-content monitoring sensor was based on a passive, wireless inductor-capacitor (LC) resonant circuit which, when embedded in test samples, remotely measures the internal water content of samples by tracking the changes in the sensor's resonant frequency.…”

Section: Moisture Content Monitoring Wireless Sensormentioning

confidence: 99%

“…The water-content monitoring sensor was based on a passive, wireless inductor-capacitor (LC) resonant circuit which, when embedded in test samples, remotely measures the internal water content of samples by tracking the changes in the sensor's resonant frequency. Ong et al (2008) also identified several potential applications of the LC sensor in transportation engineering projects such as for monitoring trapped water in asphalt pavement resulting from precipitation, snowmelts, subsurface water tables, and runoff and monitor water trapped in pavement substructures (base, subbase, subgrade, and pile structures), which cause frost-heave issues, subsurface erosion, pavement depression, and loss of structural integrity.…”

Section: Moisture Content Monitoring Wireless Sensormentioning

confidence: 99%

Highway Infrastructure Health Monitoring Using Micro-Electromechanical Sensors and Systems (Mems)

Ceylan

Gopalakrishnan

Kim

et al. 2014

Journal of Civil Engineering and Management

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The development of novel "smart" structures by embedding sensing capabilities directly into the construction material during the manufacturing and deployment process has attracted significant attention in autonomous structural health monitoring (SHM). Micro-electromechanical systems (MEMS) provide vast improvements over existing sensing methods in the context of SHM of highway infrastructure systems, including improved system reliability, improved longevity and enhanced system performance, improved safety against natural hazards and vibrations, and a reduction in life cycle cost in both operating and maintaining the infrastructure. Advancements in MEMS technology and wireless sensor networks provide opportunities for long-Term, continuous, real-Time structural health monitoring of pavements and bridges at low cost within the context of sustainable infrastructure systems. Based on a comprehensive review of literature and vendor survey, the latest information available on off-The-shelf MEMS devices, as well as research prototypes, for bridge, pavement, and traffic applications are synthesized in this paper. In addition, the paper discusses the results of a laboratory study as well as a small-scale field study on the use of a wireless concrete monitoring system based on radiofrequency identification (RFID) technology and off-The-shelf MEMS-based temperature and humidity sensors. Reference to this paper should be made as follows: Ceylan, H., Gopalakrishnan, K., Kim, S., Taylor, P. C., Prokudin, M., Abstract. The development of novel "smart" structures by embedding sensing capabilities directly into the construction material during the manufacturing and deployment process has attracted significant attention in autonomous structural health monitoring (SHM). Microelectromechanical systems (MEMS) provide vast improvements over existing sensing methods in the context of SHM of highway infrastructure systems, including improved system reliability, improved longevity and enhanced system performance, improved safety against natural hazards and vibrations, and a reduction in life cycle cost in both operating and maintaining the infrastructure. Advancements in MEMS technology and wireless sensor networks provide opportunities for long-term, continuous, real-time structural health monitoring of pavements and bridges at low cost within the context of sustainable infrastructure systems. Based on a comprehensive review of literature and vendor survey, the latest information available on offthe-shelf MEMS devices, as well as research prototypes, for bridge, pavement, and traffic applications are synthesized in this paper. In addition, the paper discusses the results of a laboratory study as well as a small-scale field study on the use of a wireless concrete monitoring system based on radio-frequency identification (RFID) technology and off-the-shelf MEMSbased temperature and humidity sensors.

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A Wireless, Passive Embedded Sensor for Real-Time Monitoring of Water Content in Civil Engineering Materials

Cited by 126 publications

References 15 publications

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Proton motion in a polyelectrolyte: A probe for wireless humidity sensors

Broad-Range Hydrogel-Based pH Sensor with Capacitive Readout Manufactured on a Flexible Substrate

Highway Infrastructure Health Monitoring Using Micro-Electromechanical Sensors and Systems (Mems)

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