A high-sensitivity temperature sensing method based on neodymium ion near-infrared fluorescence

Abstract

A high-sensitivity temperature sensing method based on near-infrared fluorescence of neodymium ions: 1. Doping Nd3+ and Yb3+ into phosphate to prepare fluorescent temperature sensing materials of Nd3+ (0.1mol) and Yb3+ (5mol); 2. Test the photoluminescence spectrum of the fluorescent temperature sensing material at different temperatures, and obtain the standard curve of the fluorescence intensity ratio changing with the ambient temperature; 3. Place the fluorescent temperature sensing material in the environment of the temperature to be measured, and obtain the corresponding fluorescence peak fluorescence The intensity ratio is compared with the standard curve in step 2 to obtain the measured value of the ambient temperature to be tested. The invention utilizes rare earth-doped phosphate glass to realize the fluorescence heat enhancement of the material in the medium and low temperature area, improve the signal-to-noise ratio of the system, have the advantages of wide temperature measurement range and high high temperature fluorescence intensity, and is beneficial to further realize the medium and low temperature area High-precision non-contact temperature measurement.

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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