Design and modeling of shaped-field magnetoquasistatic sensors

Sheiretov, Yanko; Zahn, M.

doi:10.1109/tmag.2005.860960

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…Thus, flexible eddy current sensors were proposed because its shape changes with the surface of the specimen to minimize the lift-off distance [ 7 ]. Up until now, many different coil structures of the flexible eddy current sensors have been designed such as a circular spiral structure [ 8 ], meandering winding magnetometer structure [ 9 , 10 ], trapezoidal structure [ 11 ], double rectangle structure [ 12 , 13 ], rosette structure [ 14 , 15 ], dual driver structure [ 16 ], gradient winding coil structure [ 17 ], mesh-winding structure [ 18 ], new rosette-like structure [ 19 ], same direction line structure [ 20 ] and so on.…”

Section: Introductionmentioning

confidence: 99%

Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution

Chen

2018

Entropy

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The Koch curve exciting coil eddy current sensor is a kind of novel flexible planar eddy current probe. In this study, an intersection angle spectrum entropy index and a radial direction energy spectrum entropy were proposed to evaluate the eddy current distribution. Eddy current distributions induced by one turn of a circular coil and one turn of a second order Koch curve coil feed with different exciting frequency alternative currents and at different lift-off distances, were simulated and the eddy current distributions varying with lift-off distance in different exciting frequencies were compared by the two proposed indices. With the increase of the lift-off distance or the decrease of exciting frequency, the similarity between the shape of the Koch curve and the eddy current distribution became weakened and the degree of the concentration of the eddy current distribution in the specimen under the exciting coil was loosened.

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Section: Introductionmentioning

confidence: 99%

Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution

Chen

2018

Entropy

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“…Based on this model, trans-impedance magnitude and phase of the sensor can be converted into equivalent conductivity and lift-off through a grid look-up and interpolation algorithm [36]. Then, a new output signal considering impacts of conductivity and lift-off is proposed as follows:…”

Section: Tc-reca Sensormentioning

confidence: 99%

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Chen

et al. 2017

Smart Mater. Struct.

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This paper investigates effects of temperature variation on output signal of rosette eddy current array (RECA) sensor and proposes a new RECA sensor with temperature compensation capability for quantitative monitoring crack of bolt-jointed structures. A temperature simulation experiment shows that temperature variation has a great influence on output signal AR of RECA sensor as crack does and even results in false alarm when environment temperature changes. Temperature-compensated RECA (TC-RECA) sensor using the new output signal ΔC considering impacts of conductivity and lift-off is developed to eliminate impacts of temperature variation on monitoring process. Then, the relation between crack length and output signal ΔC is obtained by an online monitoring experiment, which shows TC-RECA sensor can quantitatively monitor crack with an accuracy of 1 mm. Then, a temperature simulation experiment is performed to verify the sensor’s ability to eliminate effects of temperature variation on monitoring process. Results shows that output signal ΔC just changes within about 0.5% when temperature changes from −20 °C to 70 °C, which has no effects on monitoring process. Finally, a crack monitoring experimental of a bolt-jointed structure under temperature disturbance is performed to verify the sensor’s abilities of quantitative monitoring crack of bolt-jointed structures and temperature compensation. It can be concluded that TC-RECA sensor has the ability to eliminate effects of temperature variation and can quantitatively monitor crack of bolt-jointed structures with an accuracy of 1 mm.

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“…Its advantages include the flexibility ofattachment to a complex surface, high sensitivity and easy construction [74]. In recent years, the planar coil sensor has become an area ofinterest in many researches including analytical modeling of various sensor dimension designs [74][75][76] and magnetic field detection applications [77][78][79]. It has been reported that planar coil sensors have been successfully implemented in the ECT technique to inspect the PCBs [60,[80][81][82].…”

Section: Eddy Current Testing Techniquementioning

confidence: 99%

Feasibility investigation of fault diagnosis using electromagnetic analysis of planar structures

Soeung

Ali

Ellis

et al. 2011

2011 National Postgraduate Conference

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encourage and guide me back to the right track. I have learned a lot from both of them.My deepest grateful to my beloved Dad, Mum, Sister, and Brothers for their physically and mentally support not only when I am in the hard time but also in the prosperous time; they all are always mere for me. Without their support, love, and care I would probably not be able to move on and I would not be here. Thank for believing in me always.I would like to thank to my dearest friends for being always there for me all the time and in the time I need the most. I really appreciate their respectful, faithful, kind, and true friendship that they share with me. I am really thankful to the sharing of knowledge and experiences which have made me understand and see myself as who I really am. And I would like to thank V5 committees for their support and companionship throughout my studylife in theUniversity.Lastly, I would like to thank the lab technicians and other friends who have assisted me in accomplishing this project successfully.

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Design and modeling of shaped-field magnetoquasistatic sensors

Cited by 9 publications

References 7 publications

Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution

Two Novel Information Entropy Indices for Analysis of the Eddy Current Distribution

Temperature-compensated rosette eddy current array sensor (TC-RECA) using a novel temperature compensation method for quantitative monitoring crack in aluminum alloys

Feasibility investigation of fault diagnosis using electromagnetic analysis of planar structures

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