Influence of the Material on the Measurement of Surface Roughness Using Eddy Current Technology

Fricke, Lara Vivian; Lehnhardt, Bela; Barton, Sebastian; Nguyen, Hai Nam; Breidenstein, Bernd; Zaremba, David; Maier, Hans Jürgen

doi:10.1109/i2mtc43012.2020.9128881

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Frequency affects the distribution of eddy current within the test part and the minimum thickness, which can be measured without special adjustment. As stated by Fricke et al [42]; Ricci et al [43] ; Ma et al [44], the optimal frequency is affected by many factors, including the skin depth, lift-off, conductivity, and permeability of the material, shape, and buried depth of a defect and the type of coil probe. After generated, the optimal frequency for Copper C101 is 7.850MHz, as shown in Figure X.…”

Section: Operating Frequency For Eddy Current Testingmentioning

confidence: 99%

Lift-Off Effect Evaluation by Using Eddy Current Testing Technique on Copper (C101)

Sulaiman¹,

Harun²,

Eldy³

2023

IJETAE

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This study aims to develop an eddy current testing (ECT) probe that generates eddy current signals when a coil is placed above copper101 metal testing with and without nonconductive coating and the presence of lift-off height, i.e., 0, 2.5, 5.0, 7.5, and 10.0 0.5 mm. Then, the metal test with a variety of thicknesses, i.e., 1.5, 3.0, and 5.0 0.5 mm, and with varies of surface defects, i.e., 10, 20, and 30  0.5 mm, engraved on the metal testing. The coil probe is a rodshaped solenoid coil designed with an iron core with 65 mm length, 5 mm area, and 200 N turns. It demonstrates how the rod-shaped solenoid coil may be used to detect various surface defects on copper101 (C101). The optimal frequencies for C101 are 7.850 MHz. In conclusion, the output voltage signals for larger surface defect sizes increase but decrease as the thickness becomes thicker. Furthermore, as the lift-off height increases, the output voltage for both coated and non-coated metal decreases accordingly. Therefore, besides comparing the output voltage for coated and non-coated metals, there are minor differences which shows that the ECT technique in this studyis capableto detect surface defects appropriately.

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Section: Operating Frequency For Eddy Current Testingmentioning

confidence: 99%

Lift-Off Effect Evaluation by Using Eddy Current Testing Technique on Copper (C101)

Sulaiman¹,

Harun²,

Eldy³

2023

IJETAE

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“…The effect of surface roughness to eddy currents is especially prominent when the eddy current penetration depth is low compared to the surface roughness peaks [6]. This is caused by the skin effect, which causes high permeability or electrical conductivity of the material and high frequency of the alternating magnetic field to decrease the penetration depth of the eddy currents.…”

Section: Measurementmentioning

confidence: 99%

The effect of surface roughness variations to eddy current displacement measurement

Kinnunen

Tiainen

Viitala

2023

2023 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Eddy current sensors are widely used in various industrial applications. A common application where high resolution and repeatability is required is vibration monitoring in rotating machinery. Eddy current displacement sensors are used to detect vibrations by measuring very small movements of the rotating shaft. However, the electromagnetic properties of the target affect directly to the strength of the eddy currents in similar manner as the displacement change. Thus, the sensor may interpret the changes in the surface properties as changes in displacement causing measurement errors. Surface roughness causes similar errors in the eddy current measurements since the roughness variations on the surface also affect the eddy current flow. The goal of this study was to investigate the relationship between surface roughness and measurement errors in eddy current displacement measurement. Surface roughness modifications were performed to a round test piece using an abrasive filament brush. The runout of the test piece was measured before and after with eddy current sensor to detect changes caused by the brushing. Tactile surface roughness measurements were performed to evaluate the change in the surface roughness. The results showed that surface roughness variations cause significant changes to the eddy current measurements. Largest measured changes caused by the surface roughness variations were over 10 µm. The corresponding root mean square surface roughness decreased by 0.11 µm in the longitudinal direction and increased 0.06 µm the tangential direction of the test piece. It was concluded that surface roughness variations can cause significant errors in the eddy current displacement measurement.

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“…An interesting alternative to optical devices is the indirect measurement of the topography by micromagnetic principles. In [35], for example, it was shown that the measured volt amplitude can be correlated to the surface roughness. This requires a material-specific determination of the measurement setpoint and a calibration of the eddy current sensor.…”

Section: Measurement Of Surface Layer Statesmentioning

confidence: 99%

The Present State of Surface Conditioning in Cutting and Grinding

Stampfer

González

Gerstenmeyer

et al. 2021

JMMP

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All manufacturing processes have an impact on the surface layer state of a component, which in turn significantly determines the properties of parts in service. Although these effects should certainly be exploited, knowledge on the conditioning of the surfaces during the final cutting and abrasive process of metal components is still only extremely limited today. The key challenges in regard comprise the process-oriented acquisition of suitable measurement signals and their use in robust process control with regard to the surface layer conditions. By mastering these challenges, the present demands for sustainability in production on the one hand and the material requirements in terms of lightweight construction strength on the other hand can be successfully met. In this review article completely new surface conditioning approaches are presented, which originate from the Priority Program 2086 of the Deutsche Forschungsgemeinschaft (DFG).

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Influence of the Material on the Measurement of Surface Roughness Using Eddy Current Technology

Cited by 5 publications

References 7 publications

Lift-Off Effect Evaluation by Using Eddy Current Testing Technique on Copper (C101)

Lift-Off Effect Evaluation by Using Eddy Current Testing Technique on Copper (C101)

The effect of surface roughness variations to eddy current displacement measurement

The Present State of Surface Conditioning in Cutting and Grinding

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