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

A high-sensitivity, sensing method technology, applied in the direction of physical/chemical change thermometers, thermometers, instruments, etc., can solve the problems of weakened fluorescence intensity of up-conversion fluorescence, low fluorescence efficiency and quantum yield, difficult to analyze and process data, etc. , to achieve the effect of improving temperature measurement accuracy and sensitivity, improving accuracy and sensitivity, and reducing error

Active Publication Date: 2020-11-20
YANSHAN UNIV
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  • Claims
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Problems solved by technology

[0005] Although there are many advantages over the temperature measurement method based on the fluorescence intensity ratio of rare earth ions, the existing temperature sensing methods basically rely on laser-induced upconversion luminescence for temperature measurement.
However, the fluorescence efficiency and quantum yield of upconversion luminescence are low, and the fluorescent bands of temperature measurement often overlap, which makes it difficult to analyze and process data, thus causing large errors and affecting the accuracy of temperature measurement.
In addition, as the temperature gradually rises, the fluorescence intensity of the up-conversion fluorescence will be gradually weakened by the influence of thermal quenching, which will reduce the temperature measurement accuracy and limit the further increase of the upper limit of the temperature measurement. It is not suitable for temperature measurement in the high temperature range.

Method used

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

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Embodiment 1

[0029] This embodiment provides a high-sensitivity temperature sensing method for near-infrared fluorescence, which includes:

[0030] Step 1. Accurately weigh the drug according to the molar ratio (mmol%), the ratio is 50Na 2 CO 3 -200WO 3 -49.5Y 2 o 3 -5Yb 2o 3 -0.5Er 2 o 3 , Pour the raw material into the agate mortar, grind it with a grinding rod for 30 minutes, use a tablet machine to press the mixture into a sheet material, then put it in a dry and clean porcelain boat, put it in a high-temperature furnace, and keep it at 1000°C After 6 hours, let it cool naturally to room temperature after the end of the program, and finally wrap the NaY(WO 4 ) 2 : Yb 3+ / Er 3+ samples.

[0031] For the prepared NaY(WO 4 ) 2 : Yb 3+ / Er 3+ The sample is characterized, and its test results of X-ray diffraction pattern analysis (XRD) and scanning electron microscope pattern analysis (SEM) are as follows respectively figure 1 , 2 shown. It can be seen from the XRD patter...

Embodiment 2

[0046] This embodiment provides a high-sensitivity temperature sensing method for near-infrared fluorescence, which includes:

[0047] Step 1. Accurately weigh the drug according to the molar ratio (mmol%), the ratio is 100CaCO 3 -100MoO 3 -5Yb 2 o 3 -0.5Er 2 o 3 , put the raw material into the agate mortar, grind it with a grinding rod for 30 minutes, press the mixture into a sheet material with a tablet machine, put it in a dry and clean porcelain boat, put it in a high-temperature furnace, and keep it at 1100°C After 7 hours, after the end of the program, let it cool down to room temperature and take it out, and finally wrap the CaMoO with tin foil 4 : Yb 3+ / Er 3+ samples.

[0048] Step two, the CaMoO 4 : Yb 3+ / Er 3+ The sample is placed on a controllable heating stage, the laser with a center wavelength of 915nm is selected as the excitation light source, and the optical path is adjusted so that the excitation light source, the center of the sample and the lig...

Embodiment 3

[0052] This embodiment provides a high-sensitivity temperature sensing method for near-infrared fluorescence, which includes:

[0053] Step 1. Accurately weigh the drug according to the molar ratio (mmol%), the ratio is 89CaCO 3 -100WO 3 -5Yb 2 o 3 -0.5Er 2 o 3 , Pour the raw material into the agate mortar, grind it with a grinding rod for 30 minutes, use a tablet machine to press the mixture into a sheet material, then put it in a dry and clean porcelain boat, put it in a high-temperature furnace, and keep it at 1000°C After 7 hours, after the end of the program, let it cool down to room temperature and take it out, and finally wrap CaWO with tin foil 4 :Yb 3+ / Er 3+ samples.

[0054] Step 2, the CaWO 4 :Yb 3+ / Er 3+ The sample is placed on a controllable heating stage, the laser with a center wavelength of 915nm is selected as the excitation light source, and the optical path is adjusted so that the excitation light source, the center of the sample and the light e...

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Abstract

The invention provides a high-sensitivity temperature sensing method of near-infrared fluorescence, which relates to the field of optical temperature sensing. The method comprises the following steps:using 910-920nm laser as a pump light source, exciting an optical temperature sensing material doped with Yb3+ and Er3+, collecting the photoluminescence spectrum of the optical temperature sensing material in the wave band of 940-1800nm at different temperatures, integrating two fluorescence peak bands in the photoluminescence spectrum, and establishing a standard curve of the fluorescence intensity ratio of the two fluorescence peak bands with the change of temperature; and putting the optical temperature sensing material in an environment to be measured, collecting the photoluminescence spectrum in the wave band of 940-1800nm, and performing calculation to obtain a temperature value to be measured. The temperature sensing method is a temperature measuring method based on non thermal coupling energy level and Stokes fluorescence conversion, and has the advantages of wide temperature measurement range, non-overlapping spectrums, high fluorescence efficiency and high sensitivity.

Description

technical field [0001] The invention relates to the field of optical temperature sensing, in particular to a high-sensitivity temperature sensing method of near-infrared fluorescence. Background technique [0002] In today's society, temperature plays a vital role in many scientific research and production fields, and it is a key parameter for detection and control. The rapid development of materials science, biology and other fields has put forward higher requirements for temperature detection, so temperature measurement technology has been continuously improving and developing. Traditional contact temperature measurement technology (such as thermocouple, thermal resistance and other temperature sensors) is very mature, but due to the limitation of its temperature measurement principle, its dynamic and real-time performance is poor, and it can no longer meet the current development needs. In addition, traditional contact temperature measurement technology is often difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/20
CPCG01K11/20
Inventor 徐伟赵迪郑龙江
Owner YANSHAN UNIV
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