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Keeping an Eye on Fire |
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D-Tec is acknowledged as the pioneer and world leader in Video Smoke Detection (VSD) innovation and D-Tec’s products are specified by name worldwide. D-Tec’s VSD has been developed to overcome many of the problems associated with smoke detection. VSD provides solutions for previously unsolvable fire detection scenarios, working externally as well as internally and represents a true technological breakthrough in fire prevention. The early detection of smoke whether it be in lofty, voluminous areas; where high airflows are present or even in external locations has always posed a problem to fire safety professionals. Practically, it is just not possible to place detectors close enough to the area of risk to provide an effective level of fire detection. In a large voluminous area such as an aircraft hangar or warehouse there is a high reliance on the smoke overcoming distance, stratification and temperature layering before being detected. By effectively detecting smoke at source, VSD does not rely on the proximity of smoke to a detector and therefore is unaffected by distance. Whether the camera is situated 10 metres or 100 metres from a risk area, VSD will detect smoke in the same amount of time. Advanced Image Processing Thankfully with the arrival of D-Tec’s VSD technology the economical protection of these critical areas has now become a reality. VSD is based on the computer analysis of video images provided by standard CCTV cameras. Using advanced image-processing technology and extensive detection and known false alarm algorithms; D-Tec’s VSD automatically identifies the particular motion pattern of smoke and alerts the system operator to its presence in the shortest time possible. This enables a fast response to a potential fire, saving valuable time even in voluminous areas or where a high airflow may be present. |
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In situations ranging from turbine halls to historic buildings, road tunnels, rail depots, warehouses, shopping malls, aircraft hangars and many others, D-Tec’s camera-based fire detection system has established itself on the front line in the field of fire protection. On the Right Track for Fire Detection London Underground’s Stratford Market Maintenance Depot is a good example of the practical benefits of VSD. After experiencing a succession of false alarms with new fire detection system it became necessary to re-evaluate its design. The problem lay with high level beam detectors that mainly triggered through misalignment caused by building movements, sunlight, particulate contamination and even flying pigeons! D-Tec was invited to look at a solution to this problem by replacing the high-level beam detectors with a VSD system. An exacting specification was put together for the replacement system. Over 80 smoke tests were carried out to prove the effectiveness of the VSD system under a range of operating conditions, including the deployment of steam cleaning machines used to clean the rolling stock and varying lighting conditions. The installation of a 24-camera VSD system linked by fibre optic cable to the main operations’ room as part of Stratford Market’s overall fire strategy has ensured complete, effective and trouble-free protection. Since installation, there has only been one unwanted alarm and that was during the initial set-up period prior to handover.
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