Neodymium ion near infrared fluorescence-based high sensitivity temperature sensing method

Abstract

A neodymium ion near infrared fluorescence-based high sensitivity temperature sensing method is disclosed and comprises the following steps: in a first step, Nd3+ and Yb3+ are doped in phosphate, and a fluorescence temperature sensing material of Nd3+(0.1mol) and Yb3+(5mol) is obtained via preparation; in a second step, a photoluminescence spectrum of the fluorescence temperature sensing material at different temperatures is tested, and a standard curve of fluorescence intensity changing along with environment temperatures is obtained; in a third step, the fluorescence temperature sensing material is placed in an environment to be temperature-tested, a corresponding fluorescence peak-fluorescence intensity ratio is obtained and is compared with the standard curve in the second step, and therefore a measured temperature value of the environment to be tested is obtained. According to the method, rare earth doped phosphatic glass is used, fluorescence heat strengthening of material in a middle and low temperature zone is realized, and a signal to noise ratio of a system can be improved; the method is advantaged by wide temperature measurement scope, great high temperature fluorescence intensity and the like; high precision non-contact temperature measurement in the middle and low temperature zone can be further realized.

Description

technical field [0001] The invention relates to a temperature sensing method, in particular to an optical temperature sensing method. Background technique [0002] In scientific research and production, temperature is an important parameter for detection and control. Traditional temperature measurement technology is very mature, such as thermocouples and semiconductors and other temperature sensors, but its sensitive characteristics are based on electrical signals, and it is difficult or even impossible to apply to explosive and flammable, high voltage, strong electromagnetic fields, corrosive gases, etc. In special environments such as liquids, optical sensing technology has the characteristics of complete electrical insulation, chemical corrosion resistance and pollution-free, and can be applied in the above-mentioned special environments. [0003] At present, there are two main types of optical temperature sensing technologies: infrared temperature measurement and fluore...

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Problems solved by technology

[0004] Although the luminescence characteristics based on the thermal coupling energy level mechanism of rare earth ions have been used for temperature sensing in the middle and low temperature regions, as the temperature rises further, the fluorescence is quenched, which limits the further improvement of the upper limit of temperature measurement; in addition, according to From the temperature error formula derived from the thermally coupled energy level model, the higher the sensitivity of the material, the smaller the temperature measurement error and the higher the accuracy

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