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A LIE DETECTOR

AHMAD SOBRI, NORHIDAYAH (2005) A LIE DETECTOR. Universiti Teknologi Petronas. (Unpublished)

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Abstract

This project is about a lie detector and how it can respond to the physiological reaction in human body. Basically there are three different systems which will reactto the physiological changes. The first system use to sense the changes due to human electrical skin resistance. As people are exposing to the stress situation, it is believe that they will sweat more especially between fingers and palm. This will cause skin resistance to become low than normal. Dry skin is said to have a resistance in Mega Ohm while for the moist skin, the resistive value might be in the range of few Kilo Ohm. Simple circuit act as a skin resistance sensor is implemented byusing a voltage comparator. Based onthe physiological changes, heart rate will be faster than normal when people are under stress and so do the blood pressure. According to the human biological, normal heart rate is stated as 75 beats per minute (bpm) while blood pressure is 120/80 mmHg. During the study, it is realized that both of the systems (heart rate monitoring and blood pressure monitoring system) are possible to use the same circuit for monitoring or even measuring purposes. This is because, variations in both the heart rate and the blood cause expansion and contraction of the arteries and veins throughout the body. So, the second system design is to detect both parameters by using only one device. As the heart beat increases as well as the blood pressure, the value for respiration rate also increases proportionally as we breathe faster because there are more oxygen needed as the heart pumps the blood faster.

Item Type: Final Year Project
Academic Subject : Academic Department - Electrical And Electronics - Pervasisve Systems - Digital Electronics - Design
Subject: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Engineering > Electrical and Electronic
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:46
URI: http://utpedia.utp.edu.my/id/eprint/7591

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