• Every surface above 0 Kelvin (absolute zero) emits infra-red energy
• Invisible to the naked eye, the wavelengths fall within the electromagnetic
wavelength range of 0.7 to 1000 microns.
• Because infrared rays have such wide wavelength spectral bands, they are
classified into near, medium and far infrared. All types are used in a variety of
applications.
• Far infrared is used by passive infrared (PIR) detectors.
What is Infra-Red?
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