Improved interdigital sensors for structural health monitoring of composite retrofit systems

Nassr, Amr A.; El‐Dakhakhni, Wael

doi:10.1177/0731684411399944

Cited by 13 publications

(3 citation statements)

References 10 publications

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“…Two important advantages of these kinds of sensors are: only a single-side access to the test material is required and the strength of the output signal can be controlled by changing the area of the sensor, the number of electrodes or the spacing between them. There are several applications of the planar sensor in proximity/displacement measurement (Chen and Luo, 1998), non-destructive testing (Sharma, 2011), material characterization (Mamishev et al, 2004), humidity measurement (Steele et al, 2008), flow studies (Belt et al, 2010) and health monitoring (Nassr et al, 2011).…”

Section: Planar Sensorsmentioning

confidence: 99%

Film thickness planar sensor in oil-water flow: prospective study

2015

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Purpose – The purpose of this paper is to study a multiphase-flow instrumentation for film thickness measurement, especially impedance-based, not only for gas–liquid flow but also for mixtures of immiscible and more viscous substances such as oil and water. Conductance and capacitive planar sensors were compared to select the most suitable option for oil – water dispersed flow. Design/methodology/approach – A study of techniques for measurement of film thickness in oil – water pipe flow is presented. In the first part, some measurement techniques used for the investigation of multiphase flows are described, with their advantages and disadvantages. Next, examinations of conductive and capacitive techniques with planar sensors are presented. Findings – Film thickness measurement techniques for oil–water flow are scanty in the literature. Some techniques have been used in studies of annular flow (gas–liquid and liquid–liquid flows), but applications in other flow patterns were not encountered. The methods based on conductive or capacitive measurements and planar sensor are promising solutions for measuring time-averaged film thicknesses in oil–water flows. A capacitive system may be more appropriate for oil–water flows. Originality/value – This paper provides a review of film thickness measurements in pipes. There are many reviews on gas – liquid flow measurement but not many about liquid – liquid flow.

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Section: Planar Sensorsmentioning

confidence: 99%

Film thickness planar sensor in oil-water flow: prospective study

2015

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“…As a result of this, a number of planar capacitive proximity sensors have been developed for nondestructive evaluation of materials. By detecting the local variation of the dielectric properties of the materials under testing, capacitive sensing techniques have been used for structural monitoring of the concrete slab retrofitted with composites in Nassr and El-Dakhakhni (2009) and Nassr and El-Dakhakhni (2011). A planar capacitive sensor is presented by Mamoudan et al (2022) to detect rebars with different sizes in a reinforced concrete structure.…”

Section: Introductionmentioning

confidence: 99%

A new planar capacitive sensor with high sensitivity for proximity sensing of an approaching conductor

Wang,

Li,

Shi

et al. 2024

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Purpose With the development of artificial intelligence, proximity sensors show their great potential in intelligent perception. This paper aims to propose a new planar capacitive sensor for the proximity sensing of a conductor. Design/methodology/approach Different from traditional structures, the proposed sensor is characterized by sawtooth-structured electrodes. A series of numerical simulations have been carried out to study the impact of different geometrical parameters such as the width of the main trunk, the width of the sawtooth and the number of sawtooths. In addition, the impact of the lateral offset of the approaching graphite block is investigated. Findings It is found that sensitivity is improved with the increase of the main trunk with, sawtooth width and sawtooth number while a larger lateral offset leads to a decrease in sensitivity. The performance of the proposed planar capacitive proximity sensor is also compared with two conventional planar capacitive sensors. The results show that the proposed planar capacitive sensor is obviously more sensitive than the two conventional planar capacitive sensors. Originality/value In this paper, a new planar capacitive sensor is proposed for the proximity sensing of a conductor. The results show that the capacitive sensor with the novel structure is obviously more sensitive than the traditional structures in the detection of the proximity conductor.

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“…However, these proposed techniques have some issues and challenges in the application. The discussion of the issues for each of the proposed techniques can be found elsewhere [17,18]. When using CF as self-sensing element for health monitoring, additional sensors will not be required as the proposed techniques do [19].…”

Section: Introductionmentioning

confidence: 99%

Self-Sensing Hybrid Fibre-Reinforced Polymer for Structural Health Monitoring (SHM)

Alblalaihid

Al-Ghamdi

Alburayt

et al. 2022

KEM

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Hybrid composite material has been widely used in many engineering applications (e.g., for automobiles)and has several advantages over conventional fibre-reinforced composite materials, such as high strength-to-weight ratio and low cost. However, combining two kinds of reinforcement fibre within a common matrix may lead to different failure modes, such as delamination between the layers and fragmentation when the structure is subjected to high loads. To avoid this problem, real-time damage detection should be integrated into the hybrid composite structures for structural integrity. This paper outlines the working mechanisms and the initial fabrication of an integrated capacitive sensor into the intra-ply hybrid composite. The tensile test was conducted to perform the basic characterization of the proposed sensor and provide self-sensing functionality (smart structure). The results illustrate that damage between layers can be detected by in-situ monitoring. It is shown that the initial damage was detected at the turning point where the relative change in capacitance begins to decrease and when the axial tensile force increases. In addition, the developed smart material has shown a linear sensitivity toward crosshead displacement up to the turning point, and applying the monitoring is useful in self-sensing for hybrid composites.

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Improved interdigital sensors for structural health monitoring of composite retrofit systems

Cited by 13 publications

References 10 publications

Film thickness planar sensor in oil-water flow: prospective study

Film thickness planar sensor in oil-water flow: prospective study

A new planar capacitive sensor with high sensitivity for proximity sensing of an approaching conductor

Self-Sensing Hybrid Fibre-Reinforced Polymer for Structural Health Monitoring (SHM)

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