ABSTRACT
The project work titled Design and construction of a metal
detector. When fully design and implemented would be able to detect any
metallic material that is passing or coming close. This function would serve as
a security check for dangerous metallic material as an alarm. Going by the
sophisticated means of armed rubbers adopt these days in the breaking into bank
supermarkets offices and highly secured area. No security system will be
optimized or complete without the installation of metal detector. This will
stop or reduce to the bearest minimum the activities of men of the underworld.
The device we then build we function as a metal detector that can scout out
metal objects, such as coins, nails, keys such as car keys you may not be able
to fine, and even gold if you’re looking for it in a beach (through this one
may not have industrial strenght). This metal detector can detect certain kinds
of metal- especially iron –containing metals, which are called ferrous meat,
even if under a half-inch of drywell or sand.
TABLE OF CONTENT
Title Page - - - - - - - - - - i
Approval Page - - - - - - - - - ii
Certification - - - - - - - - - iii
Dedication - - - - - - - - - iv
Acknowledgement - - - - - - - - v
Abstract - - - - - - - - - - vii
Table of
Content - - - - - - - - viii
List of
Figures - - - - - - - - - xii
CHAPTER ONE: INTRODUCTION
1.1 Background of Study - - - - - - 1
1.2 Problem Statement - - - -- - - - 2
1.3 Objective of the Project - - - - - - 3
1.4 Significant of the Project - - - - - - 3
1.5 Methodology - - - - - - - - 4
1.6 Scope of the Project - - - - - - - 4
1.7 Project Outline - - - - - - - - 5
CHAPTER TWO:
LITERATURE REVIEW
2.1 What a Metal Detector Is - - - - - - 7
2.1.1 Brief History of Metal Detector Evolution - - 8
2.2 Types of Metal Detectors Available - - - - 11
2.2.1 Pulse Induction (PI) Metal Detector - - - - 12
2.2.2 Industrial Metal (IM) Detector - - - - - 14
2.2.2.1
Basic operation of an IM Detector - - - 15
2.2.3 Coin/Treasure Metal Detector - - - - 16
2.3 Uses of Metal detectors - - - - - - 18
2.4 Principles Applied in the Project - - - - 19
2.4.1 Magnetism - - - - - - - - 19
2.4.1.1 Paramagnetism - - - - - - - 22
2.4.1.2 Ferromagnetism - - - - - - - 23
2.4.1.3 Diamagnetism - - - - - - - 26
2.4.1.4 Antiferromagnetism - - - - - - 27
2.4.1.5 Ferrimagnetism - - - - - - - 28
2.4.1.6 Superparamagnetism - - - - - - 29
2.4.1.7 Electromagnet - - - - - - - 29
2.5 Electromagnetism - - - - - - - 30
2.6 Brief Description of the Electronic Components Used - 33
2.6.1 Resistor - - - - - - - - - 33
2.6.2 Inductors - - - - - - -- - 35
2.6.3 Capacitors - - - - - - - - 36
2.6.4 Transistors - - - - - - - - 37
2.6.5 TDA0161 - - - - - - - - - 37
CHAPTER THREE
3.1 Design of a Metal Detector Circuit - - - - 39
3.2 How this Metal Detector Works - - - - 39
3.3 Component Use for Design - - - - - 40
3.4 Metal Detector Schematic - - - - - 43
3.5 Explanation of Circuit - - - - - - 43
3.6 TDA0161 Proximity Detector IC - - - - 44
3.7 Resistor R1 and Potentiometer R2 - - - - 44
3.8 How to Use Metal Detector - - - - - 47
3.9 Power Supply Unit - - - - - - - 49
3.10 Principle of Operation of the Metal Detector - - 49
3.11 Calculations Involving Choice of Component and
their Functions - - - - - - - - 51
CHAPTER FOUR: SYSTEM IMPLEMENTATION
4.1 Testing - - - - - - - - - 56
4.2 Performance Evaluation - - - - - - 57
4.3 Project Packaging - - - - - - - 58
4.4 Bill of Engineering Measurement and Evaluation - 58
CHAPTER
FIVE: SUMMARY AND CONCLUSION
5.1
Summary of Achievements - - - - - 60
5.2 Problems
Encountered and Solutions Adopted - 61
5.3 Contribution to Knowledge - - - - - - 63
5.4
Suggestions for Further Improvement - - - 63
5.6
Recommendation - - - - - - - 65
5.5 Conclusions - - - - - - - - 66
References - - - - - - - - - 68
Appendix - -- - - - - - - - 70
LIST OF FIGURES
Fig 2.0: Magnetic domains in ferromagnetic material - 24
Fig 2.1: Effect of a magnet on the domains - - - 25
Fig 2.2: Antiferromagnetic ordering - - - - 27
Fig 2.3: Ferromagnetic ordering - - - - - 29
Fig. 2.4: A simple demonstration of Electromagnetism
Field - - - - - - - - - 32
CHAPTER ONE
INTRODUCTION
1.1 Background
of Study
It
has been observed that the rapid growth in the technological knowledge across
the world has been accompanied by a rapid rise in crime rate. These criminal
acts takes the form of breaking of private and official homes and making away
with a huge sum of money, valuable and in most cases hosts of lives. The
background of this project work comes into play for the removal or minimization
of the above criminal act by a way of a METAL DETECTOR, which will be handly or
connected to a strategic position in our homes and offices.
Detection
and clearance are still very often carried out in humanitarian demining ways
using manual methods or computer as primary procedure. When operating in this
way, detection phase still relies heavily on metal detectors, whereby, each
alarm needs to be carefully checked until it has been fully understood or its
source removed. This is normally done visually and prodding or excavating the
ground. Metal detectors are probably going to remain in use for some time.
1.2 Problem
Statement
Going
by the sophisticated means armed robbers adopt these days in breaking into
banks, super markets and highly secured areas or the activities of assassins in
conference hall, airport, hospital e.g. there are every indication that they
are out for the worst and a better way of lessening the harshness of these
menace is to get highly alerted security wise. No security system will be
optimized or complete without the installation of metal detector. This will
stop or reduce barest minimum, the cases of men of the underworld breaking into
banks, hotels, conference hall, homes, hospital e.t.c systematically
undetected.
The
exigency of Metal detector involvement in security outfits whether national,
sub-national and domestic level cannot be over emphasized.
The
researcher was motivated to design a project which will demonstrate the
undisputable wide use of transistors in field of electronics to produce the
kind of sound that should be able to alert people for special attention, and
serves as a danger signal in a nutshell.
1.3 Objective
of the Project
1.
To
construct a walk through metal detector that is capable of detecting the
presence of a metallic device.
2.
To
the walk through metal detector world also incorporate the functionality of
metallic object.
3.
The
walk through metal detector will be capable of producing an alarm on reception
of a metallic object.
1.4 Significant
of the Project
The
significant of this project is to construct a functional electronic detector
security system, which will be beneficial technology to human beings. This
project will also bring technology nearer home especially to the student, and
to me as the designer, and the contribution in the advancement of technology,
thus helping them to assemble, design and construct projects based on simple
component and material locally or foreign.
Again,
this project will encourage indigenous technology and discourage the large
expense being made on foreign security systems. All these were born in mind
during the assembling, designing construction and casing of this project.
1.5 Methodology
This system is developed
using several electrical and electronic principles. The principle of
electromagnetism is a major principle applied. When the coil which serves as
the sensor is placed over a metal and the system is switched ON, the electric
current passing through the coil makes it magnetic and being placed over a
metal, the metal generates a very small voltage (in micro volts) in form of
eddy currents. This generated eddy current is received by the sensors and thus
it causes a disturbance to the main current flow. The difference is harnessed
by electronics and connected to an amplifier from where it is fed into the
audio output which serves as the transducer to the system.
1.6 Scope
of the Project
The
metal detector designed in this project will make use of technology called Beat
Frequency Oscillator (B.F.O). this technology employs two oscillators at
resonance and a variation of the frequency of oscillation of one of the
oscillators due to the presence of a metallic object would be picked up by a
tiny receiver within the control box which creates an audible series of tones
(beats) based on the difference between the frequencies.
1.7 Project
Outline
The
first chapter of this project write up gives an introduction to the work
intended. It discusses a short background of the project work. The specific
objectives of the project are also clearly stated. The problem the system is to
solve and its significance is also highlighted. The scope of the work is stated
here in terms of the parameters to be achieved in the design.
The
second chapter of this write up reviews the related literature of the work. It
gives basic insight as to principle of operation of the system. It also reviews
past design in this field and the results obtained.
The
third chapter show cases the design methodology and on the explanation of each
method employed.
The
fourth discusses the actual design of the work. The analysis, assumptions an
mathematical models involved in achieving a complete system design is
discussed.
The
chapter five deals on the procedures observed in the coupling of the different
designs and modules of the work. Also the result of the finished project after
test and evaluation and conclusion made are stated.
The
last chapter contains the conclusion and recommendations made. It also contains
the Bill of Engineering Measurement and Evaluation (BEME).
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