Surface-mounted periodic field eddy current sensors for structural health monitoring

Goldfine, Neil; Zilberstein, Vladimir; Schlicker, Darrell; Sheiretov, Yanko; Walrath, Karen; Washabaugh, Andrew; Otterloo, Douglas Van

doi:10.1117/12.434180

Cited by 14 publications

(10 citation statements)

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“…They are minimally invasive and suitable for permanent attachment to or embedment into metallic structures. Reduction of inspection costs, along with increased safety with permanently mounted eddy-current sensors, were proposed more than two decades ago [12], but their capabilities and potential have not been yet fully harnessed. The use of surface-bonded eddy-current coils do not need on-board instrumentation, as they could be connected to auxiliary instrumentation only at the time of testing.…”

Section: Introductionmentioning

confidence: 99%

Crack Growth Monitoring with Structure-Bonded Thin and Flexible Coils

Mandache

Desnoyers

Bombardier

2022

Sensors

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Structural health monitoring with thin and flexible eddy-current coils is proposed for in situ detection and monitoring of fatigue cracks in metallic aircraft structures, providing a promising means of crack sizing. This approach is seen as an efficient replacement to periodic inspections, as it brings economic and safety benefits. As such, printed-circuit-board eddy-current coils are viable for in situ crack monitoring for multi-layer, electrically conductive structures. They are minimally invasive and could be attached to or embedded into the evaluated structure. This work focuses on the monitoring of fatigue crack growth from a fastener hole with structure-bonded, thin, and flexible spiral coils. Numerical simulations were used for optimization of the driving frequency and selection of crack-sensitive coil parameters. The article also demonstrates the fatigue crack detection capabilities using spiral coils attached to a 7075-T6 aluminum coupon.

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Section: Introductionmentioning

confidence: 99%

Crack Growth Monitoring with Structure-Bonded Thin and Flexible Coils

Mandache

Desnoyers

Bombardier

2022

Sensors

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“…SHM aims to use embedded sensors and actuators on the structure to progressively monitor parameters that can provide an indirect measure of the health of the structure. Some of the SHM techniques are acoustic emission [ 1 ], modal analysis [ 2 ], eddy current analysis [ 3 ], etc . Most of these techniques cannot be applied in real-time thereby limiting the application.…”

Section: Introductionmentioning

confidence: 99%

Effect of Voltage Measurement on the Quantitative Identification of Transverse Cracks by Electrical Measurements

Selvakumaran

Lubineau

2016

Sensors

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Electrical tomography can be used as a structural health monitoring technique to identify different damage mechanisms in composite laminates. Previous work has established the link between transverse cracking density and mesoscale conductivity of the ply. Through the mesoscale relationship, the conductivity obtained from electrical tomography can be used as a measure of the transverse cracking density. Interpretation of this measure will be accurate provided the assumptions made during homogenization are valid. One main assumption of mesoscale homogenization is that the electric field is in the plane. Here, we test the validity of this assumption for laminates with varying anisotropy ratios and for different distances between the cracked ply and surface that is instrumented with electrodes. We also show the equivalence in electrical response between measurements from cracked laminates and their equivalent mesoscale counterparts. Finally, we propose some general guidelines on the measurement strategy for maximizing the accuracy of transverse cracks identification.

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“…This technology has been successfully applied in the aerospace and manufacturing industries and provides substantially improved performance for imaging surface and buried damage through coatings and for curved surfaces compared to conventional NDE methods. [1][2][3][4][5] BACKGROUND ON MWM-ARRAY TECHNOLOGY MWM and MWM-Arrays are inductive, eddy-currentbased sensors that are conformable and provide inspection and monitoring capabilities for conducting materials, such as steel pipeline walls and drill pipe. [6] As shown in Figure 1, the original MWM sensor geometry had a meandering primary winding for creating a spatially periodic magnetic field when driven by an electrical current -hence the MWM name.…”

Section: Introductionmentioning

confidence: 99%

Eddy Current Sensor Arrays for Pipeline Inspection With and Without Coatings

Washabaugh

Haque

Jablonski

et al. 2010

2010 8th International Pipeline Conference, Volume 1

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Coatings are used on pipelines throughout the oil and gas industry for a variety of applications including corrosion protection, temperature maintenance, and weight control. These coatings also present a barrier to inspections for damage and typically need to be removed prior to inspection with nondestructive evaluation (NDE) methods. This has led to the development of improved NDE methods for detection and characterization of damage without removing the coatings or insulation. This paper describes adaptations of JENTEK’s Meandering Winding Magnetometer (MWM®)-Array technology for improved NDE in pipelines, including rapid and reliable imaging of damage, such as external corrosion, external mechanical damage, and stress corrosion cracking (SCC). The MWM-Array technology uses magnetic field-based sensor arrays and model-based inverse methods to determine electromagnetic and geometric properties of the pipeline material, which are then related to specific damage conditions of interest. This technology has been successfully applied in the aerospace and manufacturing industries and provides substantially improved performance for imaging surface and buried damage through coatings and for curved surfaces compared to conventional NDE methods. Several representative applications are described. These include: 1) imaging of near surface material loss through moderate thickness coatings (less than 1.5-in. (38 mm)); 2) imaging of mechanical damage through thin (less than 0.25-in. (6.35 mm)) coatings; 3) imaging of SCC through very thin (less than 0.030-in. (0.76 mm)) and thin (less than 0.25-in. (6.35 mm)) coatings. For SCC, digital imaging of damage regions and automated analysis tools for assessing individual cracks has the potential to be a replacement for magnetic particle inspection (MPI). Initial work has demonstrated these capabilities in a laboratory environment with some field testing and ongoing work is transitioning this technology into field environments.

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Surface-mounted periodic field eddy current sensors for structural health monitoring

Cited by 14 publications

References 0 publications

Crack Growth Monitoring with Structure-Bonded Thin and Flexible Coils

Crack Growth Monitoring with Structure-Bonded Thin and Flexible Coils

Effect of Voltage Measurement on the Quantitative Identification of Transverse Cracks by Electrical Measurements

Eddy Current Sensor Arrays for Pipeline Inspection With and Without Coatings

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