Heat radiation Flame detector

heat radiation

infrared flame detectors suffer infrared heat radiation not emitted possible fire. 1 fire can masked other heat sources. objects have temperature higher absolute minimum temperature (0 kelvins or −273.15 °c) emit energy , @ room temperature (300 k) heat problem infrared flame detectors highest sensitivity. moving hand sufficient trigger ir flame detector. @ 700 k hot object (black body) starts emit visible light (glow). dual- or multi-infrared detectors suppress effects of heat radiation means of sensors detect off co2 peak; example @ 4.1 µm. here necessary there large difference in output between applied sensors (for example sensor s1 , s2 in picture). disadvantage radiation energy of possible fire must bigger present background heat radiation. in other words, flame detector becomes less sensitive. every multi infrared flame detector negatively influenced effect, regardless how expensive is.