Photosensors or photodetectors are sensors of light or other electromagnetic energy.
Infrared (IR) light is electromagnetic radiation with longer wavelengths than those of visible light,
light-emitting diode (LED) is a two-lead semiconductor light source that resembles a basic pn-junction diode, except that an LED also emits light
Thermal Imaging Camera (colloquially known as a TIC) is a type of thermographic camera used in firefighting.
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