DESIGN AND CONSTRUCTION OF A LIE DETECTOR
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Lie detection, also referred to as deception detection, uses questioning techniques along with technology that records physiological functions to ascertain truth and falsehood in response. The main aim of this study is to build a lie detecting device. This device is commonly used by law enforcement and it also has wider area of applications. This device was built around few electronics components such as transistors, resistors, capacitor, variable resistors etc. Lie detector was completely built and testing results show that this system can be used for interpreting person’s skin resistance or anxiety changes.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
INTRODUCTION
- BACKGROUND OF THE STUDY
- PROBLEM STATEMENT
- AIM AND OBJECTIVE OF THE PROJECT
- SCOPE OF THE PROJECT
- APPLICATION OF THE PROJECT
- LIMITATION OF THE STUDY
- DEFINITION OF TERMS
CHAPTER TWO
LITERATURE REVIEW
2.1 REVIEW OF THE STUDY
2.2 POLYGRAPH
2.3 BASIC APPROACHES TO THE POLYGRAPH TEST
2.4 REVIEW ON POLYGRAPH
2.5 REVIEW OF RELATED STUDIES
CHAPTER THREE
3.0 MATERIALS AND METHODS
3.1 SYSTEM BLOCK DIAGRAM
3.2 SYSTEM CIRCUIT DIAGRAM
3.3 COMPONENTS USED
3.4 CIRCUIT DESCRIPTION
3.5 CIRCUIT OPERATION
3.6 DESCRIPTION OF MAJOR COMPONENTS USED
CHAPTER FOUR
4.0 RESULT
4.1 CONSTRUCTION PROCEDURE AND TESTING
4.2 CASING AND PACKAGING
4.3 ASSEMBLING OF SECTIONS
4.4 TESTING OF SYSTEM OPERATION
4.5 CASING AND PACKAGING
CHAPTER FIVE
- CONCLUSION AND REFERENCES
- CONCLUSION
REFERENCES
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
Lie detector also referred to as deception detection, uses questioning techniques along with technology that records physiological functions to ascertain truth and falsehood in response. It is commonly used by law enforcement and there are a wide variety of technologies available for this purpose. The most common and long used measure is the polygraph, which is considered by the U.S. National Academy of Sciences to be unreliable (Shu et al., 2012). The polygraph is a set of equipment that accurately measures various sorts of bodily activity such as heart rate, blood pressure, respiration, and palmar sweating. In recent years brain activity has also begun to be measured in this setting. This bodily activity can be displayed via ink writing pens on to charts or via a computers visual display unit.
The polygraph is widely used by analytical staff in a variety of medical and scientific settings for purposes other than lie detection. The system used sample data from two sensors collecting two distinct types of data.
It has been assumed that lying is accompanied by a change in the body physiological activity.
In lie detection situations, its use is based on the premise that lying is accompanied by changes in the activity measured by the polygraph. One of the major topics that psychologists and others have focused on across the decades is how best to determine if a testing procedure can be relied upon.
The overall objective of the work is to build a cost- effective lie detector monitoring device and to construct a prototype system with a low cost.
The principle is based on the human skin resistance, heart rate and body temperature that changes according to truthful response of subject to the questionnaire. If person lie, the skin conductance increases with increase of secretion from sweat glands thereby decreasing skin resistance. Other physiological parameters like the skin temperature and heart rate increases in response to lie by the subject. These physiological parameters are good indicators of subjects false and lie statement in the current work.
The concept behind this lie detecting system is that, we assume when a person lie he kind of pumps up his anxiety level which makes him sweat and develop moisture on his skin. We then use this piece of circuit to detect if there is moisture on his skin and based on the result we glow and LED, a green one for truth and red for lie.
1.2 PROBLEM STATEMENT
Detecting lies is crucial in many areas, such as airport security, police investigations, counter-terrorism, etc. Lying can be cognitively depleting, it can increase the risk that people will be punished, it can threaten people's self-worth by preventing them from seeing themselves as “good” people, and it can generally erode trust in society (Levine et al., 2015). It is assumed when a person lie it pumps up his anxiety level which makes him sweat and develop moisture on his skin. However, detection of these changes can be difficult to detect with our physical examination, which is also labor intensive, time consuming, and inaccurate. A lie detector was built to overcome these challenges.
1.3 AIM AND OBJECTIVES OF THE STUDY
The main aim of this work is to build a lie detecting device. The overall objectives of the work are:
- To build a cost- effective lie monitoring device.
- To construct a prototype system with a low cost.
- To develop technologies for a personal aid for mobility and monitoring.
1.4 SCOPE OF THE STUDY
The circuit is mainly designed to determine if subject were actually lying. The physiological parameters like skin resistance, skin temperature and heart rate are found to be the simplest and easily accessible parameters that changes accordingly in response to the questionnaire posed to the subject.
The scope of this study covers Development of a Lie Detection System using transistors, a capacitor, LEDs, resistors, and a variable resistor. The Lie Detector circuit is based on the fact that a person’s skin resistance changes when they sweat (sweating because they’re lying).
1.5 APPLICATION OF THE STUDY
This device is found to be useful to detect theft person by law enforcement. It helps in crime investigation and for counseling a person by psychiatrist.
1.6 LIMITATION OF THE STUDY
The prototype designed is found to be simple, portable and cost effective with good accuracy. But if the person subjected to the test is too confident about his responses then the test may not detect as there may not be any sweat or nervous feeling. The test may also fail if the subject is too tensed or mentally weak. In real time, the test can be performed with proper sedations to the subjects that may give more accurate results.
1.7 DEFINITION OF TERMS
Common terms attached to this work are defined as below:
FEAR – is emotional response to specific danger that appears to beyond a person’s defensive power.
STIMULUS – is a force or motion reaching the organism and excites the receptors.
REACTION – it is an action in mental attitude evokes by external influence.
DECEPTION – is an act of deceiving or misleading usually accompanied by lying.
DETECTION – It is an act of discovery of existence, presence of fact or something hidden or
obscure.
LYING – the uttering or conveying of falsehood or creating a false or misleading information with the intention of affecting wrongfully the acts and opinion of other.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of a lie detector" is also available. Order full work to download. Chapter two of "design and construction of a lie detector" consists of the literature review. In this chapter all the related work on "design and construction of a lie detector" was reviewed.
CHAPTER THREE: The complete chapter three of "design and construction of a lie detector" is available. Order full work to download. Chapter three of "design and construction of a lie detector" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of "design and construction of a lie detector" is available. Order full work to download. Chapter four of "design and construction of a lie detector" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of "design and construction of a lie detector" is available. Order full work to download. Chapter five of "design and construction of a lie detector" consist of conclusion, recommendation and references.
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