SENSOR ARRAY DEVELOPMENT FOR IMAGING MAGNETIC ...

SENSOR ARRAY DEVELOPMENT FOR IMAGING
MAGNETIC FIELD
By
Oladele Kupolati
053891882
Dissertation submitted to the School of Electrical, Electronic and Computer Engineering, University of Newcastle, in
Partial fulfilment of the requirements for the
Degree of BEng in Electrical & Electronic
Engineering.
2009.

Supervisor: Professor Gui .Y. Tian
2nd Supervisor: Dr Anthony O’Neill
List of Contents
Chapter 1: Introduction




Complexity of integrated circuits and growth of the industry


Flaws in steel bars


Sensor Arrays for imaging


Thesis Objectives


Organisation of the work




Chapter 2: Solid-state magnetic field sensors
2.1 Principles and technologies for the acquisition of magnetic data
2.2 Theoretical considerations
2.3 Sensor parameters & properties
2.4 Inductive & Magnetic sensors
2.5Range of magnetic field
2.6 Frequency response
2.7 Target considerations
Chapter 3: Non-Destructive Testing
3.1 Defects
3.2 Visualisation of the defects
3.3 Eddy currents
3.4 Selection of the NDT technique
3.5 Basic Principles
3.6 Hall Effect
3.7 Real time processing
3.8 Previous work on the project
3.8.1 First Experiment
3.8.2 Second Experiment
3.9 Advantages of NDT
Chapter 4: Imaging system
4.1 Digital Camera
4.2 Sensor Array
4.3 Arrangement of the sensor array
4.4 Data Acquisition
4.4.1 Data acquisition hardware
4.4.1 Data acquisition software
Chapter 5: Results and Discussion
5.1 Results
5.2 Discussion
5.3 Advancement and progress in non destructive testing
5.4 Conclusion
Chapter 6: Acknowledgements
Chapter 7: References
Chapter 8: Appendices
Pin connections, and software program
Magnetic Terms and Units



Term quantity


MKSA unit


subunits


CGS unit


conversion




Magnetic field strength H
Magnetization M
Magnetic induction B
(flux density)
Magnetic flux φ
Magnetic Polarization J
Permeability (absolute) µ
Permeability of vacuum (magnetic constant) µo


A/m
A/m
T (Tesla)
=
Wb (Weber)
= V. s
T




1A/cm =100 A/m
1mA/cm=0.1A/m
1kA/m=1000A/m
1mT = 10-3 T
1µT = 10-6 T
1 nT = 10-9 T
...