Design and implementation of a low-cost lie detector
Abstract
A lie detector or a polygraph is a device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is being asked and answers a series of questions [1]. A deceptive response to a question causes a reaction such as fear of being detected or psychological arousal that causes a change in respiratory rate, heart rate, skin conductance etc. [2]. All of these physical changes can be monitored by a group of sensors integrated into a single device. Polygraphs have a wide range of application for instance in courts of laws, security organization like police and detective departments, sometimes in company during recruitment etc