The main function of optical fiber temperature measurement
2021-06-11
Optical fiber temperature measurement technology is a new technology that has only been developed in recent years, and has gradually revealed some excellent characteristics. But just like other new technologies, optical fiber temperature measurement technology is not a panacea. It is not used to replace traditional methods, but to supplement and improve traditional temperature measurement methods. By giving full play to its strengths, new temperature measurement solutions and technical applications can be created, as described below: Temperature measurement under strong electromagnetic field. High-frequency and microwave heating methods have received attention and are gradually expanding to the following fields: high-frequency melting of metals, welding and quenching, vulcanization of rubber, drying of wood and fabrics, pharmaceuticals, chemicals, and even home cooking. Optical fiber temperature measurement technology has absolute advantages in these fields, because it has neither additional heating caused by conductive parts, nor interference from electromagnetic fields. Temperature measurement of high-voltage electrical appliances. The most typical application is the temperature measurement of high-voltage transformer winding hot spots. The British Electric Energy Research Center has been studying this subject since the mid-1970s, initially for fault diagnosis and prediction, and later for the application of computer power management. It switched to safe overload operation to make the system in the best power distribution. status. Another type of application is various high-voltage devices, such as generators, high-voltage switches, overload protection devices, and even overhead power lines and underground cables. The production process of flammable and explosive materials and the temperature measurement of equipment. The optical fiber sensor is essentially a fire-proof and explosion-proof device. It does not require explosion-proof measures and is very safe and reliable. Compared with electrical sensors, it can reduce costs and increase sensitivity. For example, the reaction tank of a large chemical plant works at high temperature and high pressure. Real-time monitoring of the surface temperature characteristics of the reaction tank can ensure its correct operation. The optical fiber is laid along the surface of the reaction tank into a temperature sensing grid, so that any hot spots can be monitored. Effectively prevent accidents. Temperature measurement of high temperature medium. In the metallurgical industry, when the temperature is higher than 1300°C or 1700°C, or when the temperature is not high but the use conditions are bad, there are still many temperature measurement problems. Give full play to the advantages of optical fiber temperature measurement technology, some of which are expected to be solved. For example, the continuous temperature measurement of molten steel, molten iron and related equipment, the temperature distribution of the blast furnace body, etc., related researches are ongoing at home and abroad. Bridge safety inspection. In the domestic bridge safety inspection project, fiber grating sensors are used to detect the stress, strain and temperature changes of the bridge under various conditions. 8 fiber grating strain sensors and 4 fiber grating temperature sensors are arranged on the selected end face of the bridge, of which 8 fiber grating strain sensors are connected in series to form 1 channel, and 4 temperature sensors are connected in series to form 1 channel, and then transmitted by optical fiber Go to the bridge management office to realize the centralized management of the bridge. Judging from the test results, the test data obtained by the fiber grating sensor is consistent with the expected results. Inspection of molten steel casting. In order to prevent the molten steel from being oxidized and improve the quality during the casting of the continuous caster, it is hoped that the molten steel will flow from the ladle to the tundish in a state completely isolated from the air. But in fact, when the ladle casting is finished, the operator visually judges whether the slag has flowed out, so the airtight state is broken between 5 and 10 minutes before the ladle casting is finished. In order to prevent the quality of the cast slab from deteriorating and erroneous judgment of slag leakage, an optical fiber slag leakage detection device was developed.
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