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Temperature measurement method based on trivalent rare earth ferrous oxides as temperature sensing materials

A technology of iron-based oxides and rare earth oxides, which is applied in the direction of physical/chemical change thermometers, thermometers, measuring devices, etc., can solve the problems of limited testing capabilities of infrared temperature measuring equipment and achieve good measurement results

Inactive Publication Date: 2014-02-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current infrared temperature measurement equipment is limited in its ability to test at low temperatures, and thermocouple sensing materials need to be introduced into a circuit to measure, so there are certain limitations

Method used

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  • Temperature measurement method based on trivalent rare earth ferrous oxides as temperature sensing materials

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Effect test

Embodiment 1

[0027] GdFeO 3 Belonging to the perovskite structure, it is an antiferromagnetic material below 661K, and its antiferromagnetic resonance frequency at room temperature is 0.61THz. Gadolinium oxide powder (Gd 2 o 3 ) and iron oxide powder (Fe 2 o 3 ) mixed at a molar ratio of 1:1, mechanically ball milled for 24-36 hours, and dried in an oven at 60-70°C to obtain a uniformly mixed powder; the product powder was heat-treated at 1100-1150°C for 2-3 hours to obtain a composition of GdFeO 3 The composite powder is made into a ceramic body with a diameter of 10-20mm and a thickness of 1-2mm by dry pressing technology; after 3-4 hours of pressureless sintering at 1350-1400°C, dense GdFeO 3 The ceramic material is the temperature sensing material; the GdFeO 3 The temperature sensing material is used as a test sample, and its magnetic dipole radiation frequency at different temperatures is tested on a terahertz time-domain spectrometer equipped with a temperature-variable accessor...

Embodiment 2

[0029] DyFeO 3 It also belongs to the perovskite structure, its antiferromagnetic-paramagnetic transition temperature is 645K, and its room temperature antiferromagnetic resonance frequency is 0.51THz. Dysprosium oxide powder (Dy 2 o 3 ) and iron oxide powder (Fe 2 o 3 ) mixed at a molar ratio of 1:1, mechanically ball milled for 36-48 hours, and dried in an oven at 70-80°C to obtain a uniformly mixed powder; the product powder was heat-treated at 1100-1150°C for 3-4 hours to obtain a composition of DyFeO 3 The composite powder is made into a ceramic body with a diameter of 10-20mm and a thickness of 1-2mm by dry pressing technology; after 1400-1450°C pressureless sintering for 2-3 hours, dense DyFeO 3 The ceramic material is the temperature sensing material; the DyFeO 3 The temperature sensing material is a test sample, and its magnetic dipole radiation frequency at different temperatures is tested on a terahertz time-domain spectrometer equipped with a variable temperat...

Embodiment 3

[0031] TmFeO 3 Belonging to the perovskite structure, it is an antiferromagnetic material below 632K, and its room temperature antiferromagnetic resonance frequency is 0.70THz. Gadolinium oxide powder (Tm 2 o 3 ) and iron oxide powder (Fe 2 o 3 ) with a molar ratio of 1:1, mechanical ball milling for 36-48 hours, and drying in an oven at 60-70°C to obtain a uniformly mixed powder; heat-treat the product powder at 1100-1150°C for 3-4 hours to obtain a composition of TmFeO 3 The composite powder is made into a ceramic green body with a diameter of 10-20mm and a thickness of 1-2mm by dry pressing technology; after 3-4 hours of pressureless sintering at 1400-1450°C, dense TmFeO 3 The ceramic material is the temperature sensing material; after measuring the radiation frequency-temperature standard curve, it can be used for temperature sensing devices.

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Abstract

The invention discloses a temperature measurement method based on trivalent rare earth ferrous oxides as temperature sensing materials, and belongs to the technical field of thermally responsive materials. The trivalent rare earth ferrous oxides are prepared through a pressureless sintering technology by using trivalent rare earth oxides and ferric oxides as the raw materials. Under the excitation of THz waves, the trivalent rare earth ferrous oxides can radiate out narrow band THz waves, and the center frequency of the narrow band THz waves obviously change along with temperature, so the trivalent rare earth ferrous oxides can be used as the temperature sensing materials and applied to temperature measurement. In the temperature measuring process, a circuit does not need to be led in, and the measurement effect can be good at low temperature. The working temperature range of the temperature sensing materials is wider, theoretically, 0K to antiferromagnetic-paramagnetic transition temperature (650-750K) can be achieved, and the working mode can be in a transmission type or a reflection type. In addition, due to the fact that the THz waves have a good permeance property to most of materials except for metal and strong polar materials, the THz waves can be used for measuring the internal temperature of a closed space.

Description

technical field [0001] The invention relates to the technical field of temperature sensitive materials, in particular to a temperature measurement method based on trivalent rare earth iron-based oxide as a temperature sensing material. Background technique [0002] Terahertz radiation generally refers to the frequency between 0.1 and 10THz (1THz=1×10 12 Hz) range, on the electromagnetic spectrum, terahertz radiation is between microwaves and far infrared. In recent years, with the advancement of THz wave radiation and detection technology, terahertz spectrometers have been widely used in material performance characterization, biomedical imaging and other fields. [0003] The current infrared temperature measurement equipment is limited in its ability to test at low temperatures, and thermocouple sensing materials need to be introduced into a circuit to measure, so there are certain limitations. The detection mechanism of the temperature sensing material based on terahertz ...

Claims

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Application Information

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IPC IPC(8): G01K11/20
Inventor 周济傅晓建毕科
Owner TSINGHUA UNIV
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