Noncontact Thickness Measurement of Metal Films Using Eddy-Current Sensors Immune to Distance Variation

Wang, Hongbo; Li, Wei; Feng, Zhihong

doi:10.1109/tim.2015.2406053

Cited by 107 publications

(20 citation statements)

References 25 publications

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“…The inductance of the sensor coil decreases due to the reduction in magnetic flux in the coil. Additionally, the resistance of the sensor coil increases because of the energy dissipation caused by the PEC [34]. This was verified by experiments and analyses in the study.…”

Section: Resultssupporting

confidence: 72%

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

Lee

2021

Sensors

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Structural health monitoring (SHM) can be more efficient with the application of a wireless sensor network (WSN). However, the hardware that makes up this system should have sufficient performance to sample the data collected from the sensor in real-time situations. High-performance hardware can be used for this purpose, but is not suitable in this application because of its relatively high power consumption, high cost, large size, and so on. In this paper, an optimal remote monitoring system platform for SHM is proposed based on pulsed eddy current (PEC) that is utilized for measuring the corrosion of a steel-framed construction. A circuit to delay the PEC response based on the resistance–inductance–capacitance (RLC) combination was designed for data sampling to utilize the conventional hardware of WSN for SHM, and this approach was verified by simulations and experiments. Especially, the importance of configuring sensing modules and the WSN for remote monitoring were studied, and the PEC responses caused by the corrosion of a specimen made with steel were able to be sampled remotely using the proposed system. Therefore, we present a remote SHM system platform for diagnosing the corrosion condition of a building with a steel structure, and proving its viability with experiments.

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Section: Resultssupporting

confidence: 72%

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

Lee

2021

Sensors

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“…Based on the equivalent circuit of the transformer, the CFRP sample in this study was modeled with self‐inductance and electrical resistance, denoted by

L_{eddy}

and

R_{eddy}

, respectively (Figure 2C). 31–33 …”

Section: Methodsmentioning

confidence: 99%

“…Based on the equivalent circuit of the transformer, the CFRP sample in this study was modeled with self-inductance and electrical resistance, denoted by L eddy and R eddy , respectively (Figure 2C). [31][32][33] As discussed earlier, eddy current loss was used to characterize the active power loss, also referred to as Joule heat, caused by the flow of eddy current in the CFRP. The power losses caused by the eddy currents on L eddy and R eddy were reactive and active power losses, respectively.…”

Section: Measurement Of Eddy Current Loss Using the New Probementioning

confidence: 99%

A new probe‐based electromagnetic non‐destructive testing method for carbon fiber‐reinforced polymers utilizing eddy current loss measurements

Yang

Feng

2023

Polymer Composites

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Eddy current testing (ECT) is a widely used technique for detecting defects in carbon fiber‐reinforced polymers (CFRPs) at high frequencies. However, designing high‐frequency systems can be challenging, and high noise levels can be problematic. To address these issues, non‐destructive testing (NDT) methods that can detect CFRP defects at lower frequencies must be explored. In this study, a novel NDT method for detecting defects in CFRP at low frequencies was proposed. This method is an alternative to pulsed eddy current thermography and can achieve similar detection and imaging results at low frequencies. Furthermore, the developed method has a simpler structure and is easier to implement. This method uses the eddy current loss to characterize the thermal power of the eddy current in CFRP. A new probe was used to detect the eddy current loss to inspect the CFRP. The effectiveness of the proposed method was experimentally verified using different types of CFRP samples based on the C‐scan technology. The scanned images demonstrate that the developed method can provide appropriate detection results up to a frequency of 750 kHz. Furthermore, rotation experiments were performed to detect the fiber direction; the proposed method successfully detected the fiber direction up to 750 kHz. Thus, the proposed method can improve the detection of defects and enhance the longevity of CFRP components. Future work will focus on enhancing the sensitivity of this method at even lower frequencies.

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“…According to Lentz’s rule, the secondary magnetic field is directed opposite to the primary field and thus causes a change in the impedance of the coil. This property makes it possible to detect defects in conductive objects [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ] and determine their geometric dimensions [ 20 , 21 , 22 , 23 , 24 , 25 ], magnetic permeability [ 26 , 27 , 28 ], or electrical conductivity [ 29 , 30 , 31 ]. The changes in the impedance components of the sensor, and therefore the sensitivity of the measurement, strongly depends on the frequency of the current that excites the eddy currents and on the geometry of the sensor.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Properties of Eddy Current Sensors Based on Their Equivalent Parameters

Dziczkowski

Tytko

2023

Sensors

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This paper presents a practical way of using the method of evaluating the metrological properties of eddy current sensors. The idea of the proposed approach consists of employing a mathematical model of an ideal filamentary coil to determine equivalent parameters of the sensor and sensitivity coefficients of tested physical quantities. These parameters were determined on the basis of the measured value of the real sensor’s impedance. The measurements were carried out with an air-core sensor and an I-core sensor while they were positioned at different distances from the surface of tested copper and bronze plates. An analysis of the influence of the coil’s position in relation to the I core on the equivalent parameters was also carried out, and the interpretation of the results obtained for various sensor configurations was presented in a graphical form. When equivalent parameters and sensitivity coefficients of examined physical quantities are known, it is possible to compare even very different sensors with the employment of one measure. The proposed approach makes it possible to make a significant simplification of the mechanisms of calibration of conductometers and defectoscopes, computer simulation of eddy current tests, creating the scale of a measuring device, and designing sensors.

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Noncontact Thickness Measurement of Metal Films Using Eddy-Current Sensors Immune to Distance Variation

Cited by 107 publications

References 25 publications

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

A new probe‐based electromagnetic non‐destructive testing method for carbon fiber‐reinforced polymers utilizing eddy current loss measurements

Evaluation of the Properties of Eddy Current Sensors Based on Their Equivalent Parameters

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