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The principle of distributed fiber optic fire alarm system and the difference between temperature sensing cable system

The Development of Distributed Fiber Optic Sensor Monitoring Technology

The 21st century is the photon century, with the rapid development of optical technology and industry. Optical sensing technology is an alternative technology to traditional electronic sensing technology and one of the fastest developing application technologies in the past decade. Fiber optic sensing technology is an important technical means for accident prevention and monitoring. Its technical performance has incomparable advantages compared to traditional temperature sensing cable sensing products, and it has been fully applied in various industries worldwide. With further understanding of technological advantages, it will comprehensively replace traditional electronic sensing systems.

The principle of distributed fiber optic cable temperature monitoring system

Temperature is the most important and fundamental physical quantity in determining whether the cable is operating properly. By monitoring the temperature of cables, cable joints, cable terminals, etc., possible or ongoing faults in cables can be predicted or detected in a timely manner, effectively preventing cable accidents from occurring
There are usually two types of cable fires, namely internal fire sources and external fire sources. Internal fire sources mainly refer to factors such as overloading of cable transmission current, high impedance at cable joints, aging of insulation skin, or partial discharge of the cable itself, which cause temperature rise on the surface of the cable. The insulation layer and protective layer of the cable also produce smoldering, accompanied by the generation of large heat and combustible gases. As the temperature increases, smoke is generated, leading to the development of a fire. External fire sources refer to the environment in which the cable is located or other fire sources inside the cable interlayer, as well as various external fire sources. External sources of fire can cause the surface of the cable to catch fire, while generating a large amount of heat and smoke. For ordinary cables, the sheath material generally releases a certain amount of combustible gas when the temperature is above 150C, and no smoke is produced at this time; A temperature range of 270C will release a large amount of combustible gases and smoke, containing toxic gases. When the temperature is above 270C, it is in an extremely unstable period and may burn at any time. For spontaneous combustion, the temperature may need to reach nearly 390C before it can burn. However, for disasters caused by external fire sources, it will burn in the presence of a large amount of combustible gas. For flame-retardant or flame-retardant cables, cable flame retardant fires may still occur. Unlike ordinary cables, the temperature of self ignition has increased to 480C, and above 190C, a certain amount of combustible gas is produced, but no smoke is produced; Generate a large amount of combustible gas at 270C. Therefore, cable faults first generate a large amount of heat, and the distributed fiber optic linear temperature sensing fire detection system monitors the changes in the surrounding environment’s heat in real time, so that it can accurately determine whether there are any abnormalities in the cable in the early stages of accidents, achieving preventive measures.

The difference between distributed fiber optic fire alarm system and temperature sensing cable system

The distributed fiber optic fire alarm system is a true linear monitoring system that can monitor the real-time temperature status of each point along the fiber optic cable. Alarm methods such as average temperature can flexibly set the alarm methods and values for each point. In the event of a fire, not only does it have the function of traditional alarm equipment for accident judgment and regional alarm, but it can also locate and set the temperature of the alarm point. In addition, through real-time temperature display, the development trend of fire accidents can be accurately judged, providing data basis for firefighting. Accurate information. Safe and reliable | not affected by electromagnetic interference and any environment, inherently safe, suitable for special hazardous situations, combined with constant and differential temperature alarms, absolutely no false alarms. Using tensile resistant, impact resistant, small outer diameter, and flexible optical cables, the installation is suspended in a straight line, which is extremely convenient and does not require close contact with the cable. It does not affect the installation and future modification of the cable, as well as long-distance monitoring. One optical cable can complete detection and signal transmission, and all settings are completed at the terminal. The entire system is simple, reliable, and maintenance free for life. The service life exceeds 30 years. From the maintenance cost and service life of the system, the cost-effectiveness of fiber optic fire alarm systems is far greater than that of temperature sensing cable products. The fiber optic system can flexibly adopt systems with different distances and numbers of channels according to the on-site usage conditions;



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