Metals News
Progress of China University of Metrology in the Development of temperature sensors for rare Earth Materials
Jul 17,2019
Source:Sensor expert network
The content below was translated by Tencent automatically for reference.

SMM News: rare earth is a general name of 17 kinds of metal elements with unique properties in non-ferrous metals, known as "industrial monosodium glutamate". It is an important strategic resource of the country and a "treasure house" for the development of new materials. It is often said that "the Middle East has oil, China has rare earths", while China is rich in rare earth resources, and its rare earths contain metals that other countries do not have.

In recent years, Chinese researchers have done a lot of research on how to make good use of rare earths and expand the application field of rare earths. Recently, it is reported that with the support of the Natural Science Foundation of Zhejiang Province, Zhao Shilong team of China University of Metrology has done in-depth research on rare earth-doped oxyfluoride microcrystal glass fiber for temperature sensors. Temperature sensor is the earliest developed and widely used kind of sensor. At present, the market share of temperature sensor greatly exceeds that of other sensors. with the support of semiconductor technology, semiconductor thermocouple sensor, PN junction temperature sensor and integrated temperature sensor have been developed in this century. Accordingly, according to the interaction between wave and matter, acoustic temperature sensor, infrared sensor and microwave sensor have been developed one after another. According to reports, at present, people have invented a variety of temperature sensors, such as traditional thermocouple, thermal resistance and radiation thermometer, but most of these temperature sensors can only be used in traditional situations. Due to the continuous expansion of the application range of temperature measurement, the innovation, research and development of temperature measurement have been carried out, the conventional temperature sensor has been unable to meet the requirements of many fields, especially in the high-tech field. "compared with the traditional temperature sensor, optical fiber temperature sensor has the characteristics of high reliability, good insulation, anti-electromagnetic interference, good repeatability, fast response speed, low price and so on." it has become one of the important directions in 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 and explosive, easy to corrode, etc., and has high research value and broad application prospects. In the development of rare earth functional materials, especially rare earth luminous materials are particularly eye-catching. Because of its special electronic layer structure, rare earth has incomparable spectral properties compared with general elements. Rare earth luminescence almost covers the whole solid luminous category, as long as it is talked about luminous, it is almost inseparable from rare earth. The application of rare earth luminous materials will bring environmental protection and energy saving, good color rendering performance and long life to the light source, which is helpful to promote the upgrading of products in the field of lighting display. At present, China's rare earth luminous material industry follows the development trend of international rare earth luminous materials research and development and application, and has established a good market interaction mechanism with the downstream industry, which has become an indispensable basic material in the development of energy-saving lighting and electronic information industry. According to reports, based on the fluorescent optical fiber temperature sensor, the research team uses the luminescence of some metal ions, especially rare earth ions in different substrates, by establishing the relationship between the fluorescence parameters of metal ions in the matrix and the temperature, so as to get the characteristics of the temperature of the substance to be measured. "through the design and optimization of the composition and process of oxyfluoride glass, highly transparent rare earth doped oxyfluoride glass was obtained, and the effects of glass composition on the temperature sensing sensitivity such as glass network structure and physicochemical properties were analyzed systematically." The rare earth doped oxyfluoride glass fiber matrix material developed in this project can provide scientific basis and technical reserve for the development of special optical fiber with independent intellectual property rights and the development of high precision optical fiber temperature sensor.


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