1．Electric power cable safety monitoring

Cable are very common in daily life and production field. A lot of cables usually been put together in power plants, substations, factories, laboratories. As people become more dependent on electricity, more and more cables are being used in power plants and substations. As a result, the probability of fire accidents also increases. In case of cable fire occurs in thermal power plant, it will cause serious damage. Most power plants and substations currently under construction and operation still use flammable cable, so cable fire prevention is particularly important.

        With the development of fiber optic temperature sensing technology, it has already been able to detect temperature, electric current, electric voltage, magnetic field and so on. The sensing fiber that fiber optic temperature sensor adopt have features like compact size, light weight, simple structure, easily use, high pressure and temperature resistance, anti-electromagnetic interference. The sensor system is safe and stable, moreover, it is very sensitive during the long-term tests.

 

2、Petrochemical field safety monitoring

For a long time, our country lack of effective long-term monitoring equipments and monitoring tools for the national energy reserve facilities, such as oil, natural gas pipelines, oil depot and so on. Besides, the monitoring equipment is relatively backward and the detection point is not continuous. There are other shortcomings such as not precise positioning, can not forecast hazards in advance, high false alarm, etc. Since 1949, there has been registered by more than 3000 onwards fire, explosion, oil spill accidents occurred in oil storage and transportation. It is worth mentioning that the oil depot fire caused by lighting in August 12, 1989, Huangdao and the fire caused by a refinery tank roof collapse in Octover, 1993, Nanjing. These two accidents resulted in eight 5000M3 steel tanks and unloading stacks and other buildings outside of tank set being burned.

3、Solutions

Distributed fiber optic temperature warning system is a kind of high-tech product which use this technology for real-time measurement of spatial temperature distribution. It not only has the advantages of ordinary optical fiber sensor, but also has the ability of distributed temperature sensing at various points along the fiber. Fiber is both a medium for transmitting information and sensors for distributed measurement. It is possible to continuously measure the temperature distribution along the fiber. The maximum distance can be measured is in the range of 10 km. The spatial positioning accuracy can reach the order of one meter for continuous automatic measurement. It is particularly useful for applications which need large-scale multi-point measurement.

        Distributed fiber optic temperature warning system has advantages such as high precision, high data transmission and reading speed, good adaptive performance, easy installation and maintenance, etc. Beijing Oriental RayZer Technology Ltd. took advantages of domestic and foreign research results, using advanced semiconductor laser technology, fiber optics filtering techniques, high-speed photoelectric conversion and signal acquisition technology, large-scale digital circuits and advanced computer technology, developed a distributed optical fiber temperature warning system. The performance of the system reached the international advanced level. Its excellent performance and reasonable price will bring great convenience and efficiency to the safety monitoring in a variety of complex work site. The fiber which the system uses is not charged, anti-radio frequency and electromagnetic interference, fire and explosion-proof, anti-corrosion, high temperature and strong electromagnetic fields resisitant, anti-electromagnetic radiation, and can work for a long term and safely in hazardous environment. By laying a few kilometers even tens of kilometers of optical fiber (fiber are both transmission medium and sensing medium) to the test space, the system can realize continuous temperature measurement of all the points along the fiber. Through the optical fiber temperature changes, the temperature changes of the environment can be obtained. As a result, the system is widely used in many fields which require long-term and real-time security monitoring, such as defense and military, petrochemical and civilian, etc.