1. Photodetector- a device that detects or responds to incident light by using the electrical effect of individual photons.
2. Infrared- having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves
3. Light-emitting diode- 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- is a type of thermographic camera used in firefighting
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