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# Kent Wei - Magnetic Induction Tomography Current Development and Potential Industrial Applications

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### Kent Wei - Magnetic Induction Tomography Current Development and Potential Industrial Applications

1. 1. Magnetic induction tomography –current development and potential industrial applications Presented in Kuwait, Electronics and Electrical Engineering Faculty 4th October 2011 Presenter: Kent Wei, on behalf of Dr. Manuchehr Soleimani
2. 2. Magnetic Induction Tomography (MIT) work in Bath
3. 3. Outline• Introduction to Magnetic Induction Tomography (MIT) – Background – MIT Theory – System Design – Software Design – Image Reconstruction Algorithm – Rotational MIT – MIT in Pipeline imaging – Other tomography techniques
4. 4. Background (MIT)• Feature: – Most recently explored electrical tomography technique, compare with other electrical tomography systems, such as EIT and ECT – Contactless Electromagnetic Imaging.• Application: – Metal detection – Industrial non-destructive testing (NDT) – Medical application
5. 5. MIT Theory• Mutual Inductance• Sensor response
6. 6. MIT System DesignBath MITMk-I and Mk-II
7. 7. MIT Instrumentation Design• LabView• NI-USB 6259
8. 8. Image ReconstructionForward Model (MIT)Conductivity Distribution Forward Model Sensor MeasurementInverse Model (MIT)Sensor Measurement Inverse Model Conductivity Distribution
9. 9. Forward ProblemsH-field (d/dt)excitation coilmeasuring coilObject eddy currentH-field (d/dt) 1       E  i (  i )E   iJ e  
10. 10. Inverse ProblemsSolving Linearised Inverse Problem: does not exist, as A is generally under-determined, i.e. not symmetrical
11. 11. Inverse Problem with Tikhonov RegularisationSolving Inverse Problem: Regularisation Parameter
12. 12. Imaging ResultImages are reconstructed using a linearised reconstructionmethod based on inversion of a sensitivity Jacobian matrixwith Tikhonov regularisation
13. 13. More Imaging ResultSuitable for metallic object imaging! HY Wei, M Soleimani, A simple magnetic induction tomography system and the image reconstruction (Published: The 4th World Congress on Industrial Process Tomography)
14. 14. Rotational MIT (RMIT)• Electrical Tomography – low imaging resolution• Coil array can be rotated with respect to the central axis• Better Image Quality with the same amount of sensors HY Wei, M Soleimani, Theoretical and experimental evaluation of rotational magnetic induction tomography (Accepted: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT) No rotation: 28 One rotation: 28x2=56 Two rotations: 28x3=84 measurements measurements measurements
15. 15. Rotational MIT 0 10 No rotation One rotation with 22.5 degreeNormalised singular values -1 Two rotations with 15 degrees 10 -2 10 -3 10 0 10 20 30 40 50 60 70 80 90 Measurement number
16. 16. RMIT Image ResultNo rotation One rotation Two rotations
17. 17. RMIT Image ResultNo rotation One rotation Two rotations
18. 18. Pipeline Inspection• Pipeline Inspection is important in industry: – undiscovered damaged pipelines => huge operational cost + environmental disaster• Current Techniques – Non-destructive testing (NDT) – In-service testing: pipeline inspection gauges (PIG) – High Cost and Highly skilled technicians required
19. 19. MIT in Pipeline Imaging• Low cost, but yet provide a satisfactory imaging• In-situ imaging
20. 20. Narrow Band-pass MIT in Pipeline Imaging• Narrowband filtering is a technique that can increase the image quality at the area of interest Reconstructed Image Reconstructed Image without narrowband with narrowband filtering filtering
21. 21. More narrowband filtering MIT result Damaged Tube with medium Hollow Tube openingwith no opening Damaged TubeDamaged Tube with large with small opening opening
22. 22. 3D Industrial MIT - SimulationSensitivity Map
23. 23. Movement of the centre of mass - ResultCopper bar Predefined Movement of the center of pattern mass extracted from the image reconstructions
24. 24. Movement of the centre of mass (Simulated Result)Woods metalphantom Movement of the centre of mass extracted from the image reconstructions
25. 25. Flow Imaging Result Aluminium cone- shaped phantom Reconstructions of the boundaries for every 2 consecutive images Reconstructions of the boundaries for every 2 consecutive images
26. 26. Conclusion• MIT is a suitable technique for conductive material imaging and NDT testing• Low cost• Image quality can enhance further by implementing different measuring techniques or reconstruction algorithms• Satisfactory Imaging Result• Close to commercialisation state
27. 27. Improved FEM Model for 3D ECT an insulation (15mm) an outer screen imaging volume a mounting pipe (3mm) a top view of sensor
28. 28. Electrical Capacitance Tomography2D 3D 4D
29. 29. Question? Kent Wei: H.Wei@bath.ac.ukManuchehr Soleimani: M.Soleimani@bath.ac.uk