Detectors 149
Detectors 149 : Particle Detectors: (4.14) Optical Beam Smoke Detector: (2) Design: (2. 1) End-to-End: An end-to-end optical beam smoke detector is a system that has a separate light transmitter and receiver. They are used in applications where there is little available room to install a wide area detector - as the receiver is on a separate element each individual unit is quite small. The small size of the detector is also an advantage for aesthetic installations, where fire protection is required without introducing unsightly or overtly modern devices. Aesthetic considerations are especially important for cultural and heritage sites. End-to-end detectors include the Open-Area Smoke Imaging Detection, which two wavelengths of light to detect smoke because UV & IR wavelengths of light react differently to smoke. The comparative difference helps to verify real smoke by comparing the reflections and seeing a difference in the profile. UV & IR both respond identically to things like blockage (ladder in front to detector path), bugs (blocking beam), fog, steam, and other things that commonly cause false alarms, so the two wavelengths of light to detect smoke accurately
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