Detectors 128
Detectors 128 : Particle Detectors: (4.11) Flame Detector: (1) Optical Types: (1. 6) IR3 Flame Detection: Triple IR flame detectors compare three specific wavelength bands within the IR spectral region and their ratio to each other. In this case one sensor looks at the 4. 4 micrometre range and the other sensors at reference bands above and below. This allows the detector to distinguish between non flame IR sources, and flames that emit hot CO2 in the combustion process (which have a spectral characteristic peak at 4. 4 micrometre). As a result, both detection range and immunity to false alarms can be significantly increased. IR3 detectors can detect a 0. 1m2 (1ft2) gasoline pan fire at up to 65m (215ft) in less than 5 seconds. Most IR detectors are designed to ignore constant background IR radiation, which is present in all environments. Instead they measure the modulated part of the radiation. When exposed to modulated non flame IR radiation, IR and UV/IR detectors become more prone to false alarms, while IR3 detectors become somewhat less sensitive, and more immune to false alarms. Triple IR, like other IR detector types, is susceptible to blinding by a layer of water on the detector's window
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