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A fast temperature measurement method based on magnetic nanometer magnetization-temperature curve

A magnetization, temperature curve technology, applied in thermometers, thermometers with electrical/magnetic components that are directly sensitive to heat, thermometers that give differences, etc., can solve the problem of low accuracy, slow temperature measurement, and no temperature given. Inversion methods and other issues to achieve high precision and reduce strength

Active Publication Date: 2018-11-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the patent CN201410374814.1 "A non-invasive fast temperature change measurement method under DC excitation magnetic field", a fast temperature change measurement method is provided, which can realize fast and accurate temperature measurement under non-invasive conditions , so as to solve the technical problems of slow temperature measurement and low precision
However, in this method, ferromagnetic materials are used, and the external magnetic field must make the ferromagnetic materials in a saturated magnetization state, and the patent does not give a specific temperature inversion method

Method used

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  • A fast temperature measurement method based on magnetic nanometer magnetization-temperature curve
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  • A fast temperature measurement method based on magnetic nanometer magnetization-temperature curve

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Embodiment approach

[0041] Based on this thinking, the embodiment of the present invention is as follows:

[0042] (1) Place the magnetic nano sample at the position to be tested

[0043] Modify the surface of magnetic nanoparticles to make them adsorbable and adsorb on the surface of the measured object, or mix the solid powder of magnetic nanoparticles with an adhesive and apply them to the surface of the measured object.

[0044] (2) Apply a suitable DC magnetic field in the area where the magnetic nanometer is located

[0045] A coil or a permanent magnet can be used to apply a DC magnetic field to the area where the magnetic nanoparticle sample is located, and the magnitude of the applied DC magnetic field can be selected according to the sensitivity of the magnetization to temperature under different DC excitation magnetic fields. figure 2 The derivatives of the magnetization to temperature under the excitation magnetic field of 100gauss, 500gauss, 900gauss and 1300gauss are respectively ...

example

[0058] In order to illustrate the above implementation steps in more detail, a simulation example of sample parameters using EMG1300 magnetic nanoparticles of Ferrotec Company is given below. The average particle size of EMG1300 is 10nm, and the saturation magnetization at room temperature is 50-70emu / g. In the simulation, M s =0.6T / μ 0 , the external magnetic field b=2.8E-5, a=1.65, the curve of magnetization intensity changing with temperature is as follows image 3 shown.

[0059] Using the double exponential function T(t)=A*(e -αt -e -βt )+T0 to simulate a temperature pulse, where the amplitude coefficient A is 100, the reciprocal of the wave tail time constant α is 1 / 300e-9, the front time constant β is 1 / 45e-9, T0 is 300K, t is time, temperature waveform like Figure 5 shown. Taking this temperature pulse as input, the normalized waveform of the coil induction signal obtained is as follows: Image 6 As shown, this signal is integrated and substituted into the ...

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Abstract

The invention discloses a rapid temperature measurement method based on a magnetic nanometer magnetization intensity-temperature curve. The method comprises the following steps of (1) placing a magnetic nanometer particle sample on the surface of a to-be-tested object; (2) applying a direct current excitation magnetic field to a region where the magnetic nanometer particle sample is located; (3) obtaining an initial temperature T (0) of the to-be-tested object, and calculating initial magnetization intensity M (0) of the initial temperature T (0); (4) adopting a detection coil to detect a response signal u(t) for magnetization intensity change due to temperature change; (5) timely calculating the magnetization intensity M (t) of magnetic nanometer particles according to the initial magnetization intensity M (0) and the response signal u(t); and (6) using the fitting magnetization intensity-temperature curve to calculate the temperature T (t) of the to-be-tested object according to the magnetization intensity M (t). The method is advantaged by achieving nanosecond order rapid temperature measurement, being rapid and real-time in measurement and accurate in measurement result, and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer measurement, and more specifically relates to a rapid temperature measurement method based on the magnetic nanometer magnetization-temperature curve. Background technique [0002] Since there is an inherent relationship between the magnetization of magnetic materials and temperature, the temperature of magnetic materials can be deduced by measuring the magnetic parameters of magnetic materials. If ferromagnetic materials are processed into nanoparticles with a single-domain structure, ferromagnetic materials will exhibit superparamagnetism. The magnetization curve of superparamagnetic materials has no hysteresis, and can be directly described by Langevin's function, which can simplify the calculation compared with ferromagnetic materials. Magnetic nanoparticles can be applied to biomedicine after being wrapped with specific groups. [0003] There are many ways to use the magnetic properties of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K3/10G01K7/36
CPCG01K3/10G01K7/36
Inventor 张朴王坤刘文中徐文彪谢辉程文祥
Owner HUAZHONG UNIV OF SCI & TECH
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