Photodetector- any of various devices for detecting and measuring the intensity of radiant energy through photoelectric action.
Infrared- light is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum.
Light-emitting diode- is a two-lead semiconductor light source that resembles a basic pn-junction diode, except that an LED also emits light.
Thermal imaging camera- the use of heat-sensitive equipment to detect or provide images of people or things
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