Method Of Signal Processing In Passive Infrared
Detectors For Security Systems
Author(s)
H. Madura
Abstract
This article presents the construction and principle of operation of passive IR
detectors (PIR detectors) of a large detection range. An important virtue of these
detectors is highly efficient detection of slowly moving or crawling people. The
PIR detector described here detects crawling people at a distance of 140 m.
High signal-to-noise ratio was obtained by using a larger number of pyroelectric
sensors, i.e., by using a larger number of detection zones (channels). The original
electronic system for the PIR detector is presented in which DC signal amplifiers
from pyroelectric signals are used. In order to ensure large detection ranges, a
new method of signal analysis was used.
Keywords: PIR detector, security systems.
1 Introduction
Main elements of security systems are PIR detectors. In general, detectors
operating inside buildings have small detection range, small ranges of working
temperature, and relatively simple algorithms of intruder detection. The detectors
used for protection of objects or large areas (buildings, airports) have larger
detection ranges and complex algorithms of signal processing on which
significantly depend the efficiency of their operation.
An essential drawback of currently available PIR detectors is low efficiency
of detection of slowly moving or crawling people. It is because radiation from
such objects is similar to background thermal noise. Moreover, to detect slowly
moving or crawling people, the lower limit frequency of a transfer band of PIR
detector should be near zero. By fulfilling this condition, increase in lowfrequency
noise occurs causing a decrease in the next detector’s sensitivity.
Keywords
PIR detector, security systems.
Related Book
Other papers in this volume
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