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China Metrology University has made progress in the development of temperature sensors for rare earth materials
[ Instrument Network Instrument Development ] Rare earth is a collective name for 17 kinds of metal elements with unique properties in non-ferrous metals. It is known as the “industrial MSG†and is a “treasure house†for the country's important strategic resources and new materials development. People often say that "there is oil in the Middle East, China has rare earths", and China has abundant rare earth resources, and the metals contained in its rare earths are not available in other countries.
How to make good use of rare earths and continuously expand the application field of rare earths. In recent years, Chinese researchers have done a lot of research. Recently, it is reported that under the auspices of the Natural Science Foundation of Zhejiang Province, the team of Zhao Shilong of China Metrology University has conducted in-depth research on the use of rare earth doped oxyfluoride glass-ceramic fibers for temperature sensors.
Temperature sensor is the earliest developed and widely used type of sensor. At present, the market share of temperature sensor greatly exceeds other sensors. With the support of semiconductor technology, semiconductor thermocouple sensor, PN junction temperature sensor and this century have been developed. Integrated temperature sensor. Correspondingly, acoustic temperature sensors, infrared sensors and microwave sensors have been developed in succession according to the interaction law between waves and matter.
According to reports, various temperature sensors have been invented, such as conventional thermocouples, thermal resistors and radiation thermometers, but most of these temperature sensors can only be used in traditional applications. As the application of temperature measurement continues to expand, innovation, research and development of temperature detection have been ongoing, and conventional temperature sensors have been unable to meet the requirements of many fields, especially in the high-tech field.
"Compared with traditional temperature sensors, fiber optic temperature sensors have the characteristics of high reliability, good insulation, anti-electromagnetic interference, good repeatability, fast response, and low price, which have become one of the important directions for the research and development of new temperature sensors." The researchers said that it is particularly suitable for temperature measurement in harsh environments, such as high current, high magnetic field, flammable, explosive, and corrosive. It has high research value and broad application prospects.
In the development of rare earth functional materials, especially rare earth luminescent materials are particularly attractive. Due to its special electronic layer structure, rare earths have spectral properties unmatched by general elements. Rare earth luminescence covers almost the entire range of solid-state luminescence. As far as luminescence is concerned, rare earths are almost inseparable. The application of rare earth luminescent materials will bring environmental protection and energy saving, good color rendering performance and long life to the light source, which is conducive to promoting the upgrading of products in the field of lighting display. At present, China's rare earth luminescent materials industry closely follows the development trend of international rare earth luminescent materials research and development, and has established a good market interaction mechanism with downstream industries, and has become an indispensable basic material in the development of energy-saving lighting and electronic information industry. According to reports, the research team based on the fluorescent fiber temperature sensor uses certain metal ions, especially the luminescence of rare earth ions in different matrices, by establishing the relationship between the fluorescence parameters of the metal ions in the matrix and the temperature, thereby obtaining the temperature of the substance to be tested. Features to carry out research.
"By designing and optimizing the composition and process of oxyfluoride glass-ceramics, highly transparent rare-earth doped oxyfluoride glass-ceramics were obtained, and the composition of glass was analyzed systematically for temperature sensing of glass network structure and physicochemical properties. The influence law of sensitivity.†The rare earth doped oxyfluoride microcrystalline glass fiber matrix material developed by this project can provide scientific basis and technical reserve for the development of special optical fiber with independent intellectual property rights.
(Original title: Application of rare earth luminescent materials in the development of temperature sensors)