1. Photodetector: Photodetectors are sensors of light or other electromagnetic energy.
2. Infrared: Infrared (IR) light is electromagnetic with longer wavelengths than those of visible light
3. Light-emitting diode: A 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
4.Thermal imaging camera: A Thermal Imaging Camera (colloquially known as a TIC) is a type of thermographic camera used in firefighting by rendering infrared radiation as visible light
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