When a fire breaks out in tunnels, halls, parking garages, cable trays, or on conveyor belts, fast action is required. In such a situation, it’s about protecting lives, minimizing material assets damage and avoiding costly outages. To meet these challenges, Siemens offers the linear heat detection system (new: line type heat detection system) FibroLaser™, a worldwide proven solution that also represents the largest installed base on the market.
FibroLaser consists of the following system components: A control unit and the glass fibre sensor cable connected to it. The control unit sends a laser beam through the cable. The glass fibre reflects this light and scatters it back – split into “Stokes” and ”Anti-Stokes” signals (Raman Effect). While Stokes signals have nearly the same signal strength at all temperatures, this value rises proportionally to the temperature with Anti-Stokes signals. Thanks to semiconductor laser diodes, FibroLaser can measure these effects in glass fibres up to 10 km in length. By comparing Stokes and Anti-Stokes the control unit now reliably calculates the temperature and position of a heat source. Through optimization of temporal and local resolution, even slight temperature changes – such as an increase of a few degrees Celsius per minute – can be reliably and exactly displayed.
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