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

Dziczkowski, Leszek; Tytko, Grzegorz

doi:10.3390/s23063267

Cited by 6 publications

(3 citation statements)

References 53 publications

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“…The probe does not move during the measurement. The movement is replaced by modulating the excitation signal of the probe, while depending on the type and purpose of its use, the frequency interval must be chosen appropriately [17,18]. During the inspection, two cases can occur: the probe is placed over the location with the present defect, or this location can be predicted.…”

Section: Theoretical Background and Fundamental Principlesmentioning

confidence: 99%

Progress in Evaluation of Deep Artificial Defects from Sweep-Frequency Eddy-Current Testing Signals

Smetana

Gombarska

Psenakova

2023

Sensors

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The article discusses the practical application of the method of electromagnetic non-destructive investigation of austenitic materials. To identify and evaluate deep artificial defects, the sweep-frequency eddy current method with harmonic excitation is used. The objects of interest are the surface electric-discharged machined notches, with a defined geometry, fabricated in a plate with a thickness of 30 mm. An innovative eddy current probe with a separate excitation and detection circuit is used for the investigation. The achieved results clearly demonstrate the robustness and potential of the method, especially for deep defects in thick material. By using the fifth probe in connection with the frequency sweeping of eddy currents, it is possible to reliably detect artificial defects up to 24 ± 0.5 mm deep by using low-frequency excitation signals. An important fact is that the measuring probe does not have to be placed directly above the examined defect. The experimental results achieved are presented and discussed in this paper. The conducted study can serve, for example, as an input database of defect signals with a defined geometry to increase the convergence of learning networks and for the prediction of the geometry of real (fatigue and stress-corrosion) defects.

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Section: Theoretical Background and Fundamental Principlesmentioning

confidence: 99%

Progress in Evaluation of Deep Artificial Defects from Sweep-Frequency Eddy-Current Testing Signals

Smetana

Gombarska

Psenakova

2023

Sensors

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“…However, capacitive sensors are susceptible to influence from media, the environment, and contaminants, thus limiting their application in sealed enclosures or environments with strict control measures. Eddy current sensors, based on the electromagnetic induction principle, convert displacement [ 9 ], amplitude, thickness, size, cracks, and other information of the measured target into measurements of Q value, the equivalent impedance Z, and the equivalent inductance L of the sensor coil [ 10 ]. They have advantages such as a simple structure, low price, high sensitivity, wide frequency band, resistance to influence from oily media, and strong anti-interference ability.…”

Section: Introductionmentioning

confidence: 99%

Single-Ended Eddy Current Micro-Displacement Sensor with High Precision Based on Temperature Compensation

Xu,

Feng,

Liu

et al. 2024

Micromachines

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To measure the micro-displacement reliably with high precision, a single-ended eddy current sensor based on temperature compensation was studied in detail. At first, the principle of the eddy current sensor was introduced, and the manufacturing method of the probe was given. The overall design plan for the processing circuit was induced by analyzing the characteristics of the probe output signal. The variation in the probe output signal was converted to pulses with different widths, and then it was introduced to the digital phase discriminator along with a reference signal. The output from the digital phase discriminator was processed by a low-pass filter to obtain the DC component. At last, the signal was amplified and compensated to reduce the influence of temperature. The selection criteria of the frequency of the exciting signal and the design of the signal conditioning circuit were described in detail, as well as the design of the temperature-compensating circuit based on the digital potentiometer with an embedded temperature sensor. Finally, an experimental setup was constructed to test the sensor, and the results were given. The results show that nonlinearity exists in the single-ended eddy current sensor with a large range. When the range is 500 μm, the resolution can reach 46 nm, and the repeatability error is ±0.70% FR. Within the temperature range from +2 °C to +58 °C, the voltage fluctuation in the sensor is reduced to 44 mV after temperature compensation compared to the value of 586 mV before compensation. The proposed plan is verified to be feasible, and the measuring range, precision, and target material should be considered in real-world applications.

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“…Poletkin et al [ 28 ] derived sets of analytical formulas for the calculation of nine components of magnetic stiffness of corresponding force arising between two current-carrying circular filaments arbitrarily oriented in the space by using Babic’s method and the method of mutual inductance (Kalantarov–Zeitlin’s method). Dziczkowski et al [ 29 ] presented 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.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Geometric Structure Parameters of Eddy Current Testing Probe on Sensor Resolution

Song

Xiao

et al. 2023

Sensors

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To study the influence of the geometric structure of the probe coil on the electromagnetic characteristics of the eddy current probe in the process of eddy current testing, based on the principle of eddy current testing, different probe coil models were established using finite element software. These geometric structure parameters include the difference between the inner and outer radius, thickness, and equivalent radius. The magnetic field distribution around the probe is simulated and analyzed under different parameters, and the detection performance of the probe is judged in combination with the change rate of the magnetic field around the probe coil. The simulation results show that at a closer position, increasing the difference between the inner and outer radii, reducing the thickness, and reducing the equivalent radius are beneficial to improve the resolution of the probe coil. At a far position, reducing the difference between the inner and outer radii, increasing the thickness, and reducing the equivalent radius are beneficial to improve the resolution of the probe coil. At the same time, the accuracy of the simulation data is verified by comparing the theoretical values with the simulated values under different conditions. Therefore, the obtained conclusions can provide a reference and basis for the optimal design of the probe structure.

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

Cited by 6 publications

References 53 publications

Progress in Evaluation of Deep Artificial Defects from Sweep-Frequency Eddy-Current Testing Signals

Progress in Evaluation of Deep Artificial Defects from Sweep-Frequency Eddy-Current Testing Signals

Single-Ended Eddy Current Micro-Displacement Sensor with High Precision Based on Temperature Compensation

Research on the Influence of Geometric Structure Parameters of Eddy Current Testing Probe on Sensor Resolution

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