Photodetector - sensors of light or other electromagnetic energy
Infrared - electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 mm
Light-emitting diode - two-lead semiconductor light source that resembles a basic pn-junction diode, except that an LED also emits light
Thermal imaging camera - type of thermographic camera used in firefighting, by rendering infrared radiation as visible light, such cameras allow firefighters to see areas of heat through smoke, darkness, or heat-permeable barriers
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