Fiber-optic temperature measurement

Fiber optic temperature measurement technology is only in recent years developed new technology, and has gradually reveal some excellent features. However, just as other new technologies, fiber optic temperature measurement is not a panacea, it is not used to replace the traditional methods, but to supplement traditional methods of temperature measurement and improvement. Give full play to its strengths, you can create new programs and technology applications in temperature measurement applications, as follows:

● strong electromagnetic field of temperature measurement. High-frequency and microwave heating methods are people to pay attention, to the following areas are being gradually expanded: high-frequency metal smelting, welding and hardening, curing rubber, wood and fabric drying and pharmaceutical, chemical, and even home cooking and so on. Optical temperature measurement techniques in these areas has an absolute advantage, because it has no conductive part of the additional warming caused, but also from electromagnetic interference.

● high-voltage electrical temperature measurement. The most typical application is the high voltage transformer winding hot spot temperature measurement. UK energy research center from the mid-1970s began to devote themselves to research the subject, was originally designed to fault diagnosis and prediction, and later for computer power management applications, running into the safe overload, the power distribution system is in the best the state. Another application where a variety of high-voltage devices, such as generators, high voltage switch, overload protection devices, and even overhead power lines and underground cables.

● flammable and explosive materials and equipment of the production process temperature measurement. Fiber optic sensor is essentially a fire and explosion device, it does not require the use of explosion-proof measures, very safe and reliable. Compared with electrical sensors, both to reduce costs but also improve the sensitivity. For example, large-scale chemical reaction can work in high temperature and pressure condition, the reaction tank surface temperature characteristics of real-time monitoring to ensure its proper work, the laying of fiber surface along the reaction tank into a sense of Wimbledon grid, so that any hot spots can be monitored, can effective in preventing accidents.

● heat medium temperature measurement. In the metallurgical industry, when the temperature is higher than 1300 ℃ or 1700 ℃, or when the temperature was not high but the use of harsh conditions, the temperature in many problems still exist. Give full play to the advantages of fiber optic temperature measurement techniques, some problems are expected to be resolved. For example, molten steel, molten iron and the related problem of continuous temperature measurement equipment, blast furnace temperature distribution, both at home and abroad for such research is ongoing.

● bridge safety inspection. Bridge safety inspection program in the country, using a fiber Bragg grating sensors to detect the bridge in all cases the stress-strain and temperature changes. Selected in the end face of the bridge laid eight FBG strain sensor and four fiber Bragg grating temperature sensors, eight series of FBG strain sensor 1 channel, four temperature sensors connected in series to a road, then the optical fiber transmission to control the bridge, the bridge to achieve centralized management. From the test results, fiber grating sensor test data obtained with the expected results.

● detection of liquid steel casting. Continuous casting machine casting, the molten steel to prevent oxidation and improve the quality of liquid steel in the air want to completely isolated state, the packet flow from the middle of a large package. But in fact, cast in the big bag when finished, is the residue by the operator to determine whether the visual flow, thus casting a large package before the end of 5 to 10 minutes, closed state has been destroyed. In order to prevent quality deterioration and error to determine the slab leak slag, slag developed a fiber optic leak detection device.