Optical Flame Detector is an electronic device containing electro-optical sensors that are sensitive to electromagnetic radiation in the UV, VIS, IR spectral bands. The optical detector sees the fire by detecting the electromagnetic radiation emitted by the combustion products. The optical detectors detect the radiation energy emitted by the chemical processes that take place in a fire. There are several types of optical flame detectors, including the various spectral bands that are emitted by the fire products such as UV, VIS (including video), IR & multiple IR.