• Humans and other mammals radiate
infra-red waves in band lengths from 7 to
14 microns so pyro-elements in PIR
detectors are set to detect these bands.
• PIRs detect sudden changes in Far Infra-
red radiation levels and produce
corresponding electrical signal.
• In principle, PIR detectors sense the
temperature differences between the
background and moving object in a
predetermined detection areas
What is the principle of Infra-Red detection?
To Next Page
Loading...
