Wireless surface acoustic wave sensors for displacement and crack monitoring in concrete structures

Perry, Marcus; Mckeeman, I.; Saafi, Mohamed; Niewczas, Paweł

doi:10.1088/0964-1726/25/3/035035

Cited by 8 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lateral (mode III, shear or tearing) movements in cracks can also be extracted from the differences between the two arms (using trigonometry). This design is known to provide reliable measurements of crack displacement, as similar designs have been laboratory tested in our previously published work [ 33 , 34 ].…”

Section: Sensor Design and Characterisationmentioning

confidence: 99%

Crack Monitoring of Operational Wind Turbine Foundations

Perry

McAlorum²,

Niewczas³

et al. 2017

Sensors

View full text Add to dashboard Cite

The degradation of onshore, reinforced-concrete wind turbine foundations is usually assessed via above-ground inspections, or through lengthy excavation campaigns that suspend wind power generation. Foundation cracks can and do occur below ground level, and while sustained measurements of crack behaviour could be used to quantify the risk of water ingress and reinforcement corrosion, these cracks have not yet been monitored during turbine operation. Here, we outline the design, fabrication and field installation of subterranean fibre-optic sensors for monitoring the opening and lateral displacements of foundation cracks during wind turbine operation. We detail methods for in situ sensor characterisation, verify sensor responses against theoretical tower strains derived from wind speed data, and then show that measured crack displacements correlate with monitored tower strains. Our results show that foundation crack opening displacements respond linearly to tower strain and do not change by more than ±5 μm. Lateral crack displacements were found to be negligible. We anticipate that the work outlined here will provide a starting point for real-time, long-term and dynamic analyses of crack displacements in future. Our findings could furthermore inform the development of cost-effective monitoring systems for ageing wind turbine foundations.

show abstract

Section: Sensor Design and Characterisationmentioning

confidence: 99%

Crack Monitoring of Operational Wind Turbine Foundations

Perry

McAlorum²,

Niewczas³

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…With the help of crack sensors, the safety hidden trouble introduced by crack will be awarded in time. The conventional crack sensors such as FBG (Perry et al, 2016), PZT (Dziendzikowski et al, 2018) and antenna sensor (Xu and Huang, 2012) need to be connected with measurement equipment through wires. The possibility of transmission line fault and the time-consuming process in wiring layout design have limited their application.…”

Section: Introductionmentioning

confidence: 99%

Surface crack detection and monitoring in metal structure using RFID tag

Xu¹,

Dong²,

Wang³

et al. 2020

View full text Add to dashboard Cite

Purpose RFID tags for sensing are available to operate and transmit sensing data to measurement equipment without battery and wires, which is a great advantage in establishing IoT environment. For crack sensing tags, however, the short service life of tags restricted their application. This paper aims to introduce a method of surface crack detection and monitoring based on RFID tag, which makes it possible for tags to be reused. Design/methodology/approach Metal plate to be monitored, acting as the ground plane of microstrip patch antenna, is underneath the crack sensing tag. The propagating surface crack in metal plate will change the electric length of tag’s antenna that is directly proportional to the crack depth and length. Thus, the deformation of sensing tag introduced by the load on metal structure is no longer a prerequisite for crack sensing. Findings The simulated and experimental results show that the proposed crack sensing tag can sense the change of surface crack with mm-resolution and sense surface crack propagation without a deformation, which means the proposed crack sensing tag can be reused. Originality/value The key advantage of the proposed method is the reusability of the RFID tags.

show abstract

“…Surface Acoustic Wave (SAW) sensor is a type of micro-machined passive wireless sensors that have been widely investigated and used for strain, pressure and temperature sensing, etc. [16][17][18][19][20][21][22]. A SAW sensor system consists of two parts: a SAW device connected to an antenna as the sensor transponder which need not battery supply, a local reader unit which is used for interrogation signal transmitting, echoed data receiving and data processing.…”

Section: Introductionmentioning

confidence: 99%

An Impedance-Loaded Orthogonal Frequency-Coded SAW Sensor for Passive Wireless Sensor Networks

Dai

Fang

Zhang

et al. 2020

Sensors

View full text Add to dashboard Cite

A passive wireless impedance-loaded orthogonal frequency-coded (OFC) surface acoustic wave (SAW) sensor for wireless sensor networks was proposed in this paper. One of the chips on OFC SAW tag is connected to an external sensor, which could cause a phase shift in the time response of the corresponding part on the SAW device. The phase shift corresponds to the sensed quantity, which could be temperature, strain, vibration, pressure, etc. The OFC SAW tag is isolated by a proper package from the direct effect of the measurand on the device’s response which could avoid the multiple measurands coupling. The simultaneous work of multiple sensors is guaranteed by orthogonal frequency coding. By processing the response based on an extended matched filter algorithm, sensing information of the specific coded OFC device can be extracted from the superimposed response of multiple independent encoded sensors. Compared to previous methods, the proposed method can produce a more flexible passive (battery-free) wireless sensor suitable for large-scale wireless sensor networks. Simulation and experimental results demonstrate the effectiveness of the sensor.

show abstract

Wireless surface acoustic wave sensors for displacement and crack monitoring in concrete structures

Cited by 8 publications

References 32 publications

Crack Monitoring of Operational Wind Turbine Foundations

Crack Monitoring of Operational Wind Turbine Foundations

Surface crack detection and monitoring in metal structure using RFID tag

An Impedance-Loaded Orthogonal Frequency-Coded SAW Sensor for Passive Wireless Sensor Networks

Contact Info

Product

Resources

About