Pyroelectric infrared alarm system based on human gait recognition

ZHANG Tao1，ZHONG Shuncong1，2 *
（1School of Mechanical Engineering and Automation， Fuzhou University， Fuzhou 350108， China;
2 Key Laboratory of Safety Science of Pressurized System of Ministry of Education，
 East China University of Science and Technology， Shanghai 200237， China）

Abstract：：In order to solve the problem of difficult detecting the motionless human body using pyroelectric infrared （PIR） sensor， a passive PIR alarm system based on human gait recognition was investigated to enhance the intelligence of the system and to reduce the false alarm rate. As the detector， PIR sensor was employed in the system for noncontact monitoring the human body within a certain distance. The PIR signal was filtered， amplified， and then converted to a digital signal by an analogtodigital converter. Consequently， the digital signal was sent to a microcomputer （MCU） for processing. The human body movement characteristics were analyzed to achieve accurate security alarm purpose. The experimental results demonstrate the stable performance， high sensitivity and low false alarm rate of the developed PIR alarm system， therefore， it can be recommended for the applications in security system of home， shopping center， and warehouse.
Key words：pyroelectric infrared(PIR) sensor; human movement characteristics; gait recognition; alarm system