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Temperature measurement method based on magnetic nano magnetization intensity

A magnetization and temperature measurement technology, used in thermometers, thermometers, and heat measurement using directly sensitive electrical/magnetic components, which can solve problems such as large temperature measurement errors

Active Publication Date: 2014-10-15
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the above temperature measurement methods are all based on the assumption that the magnetic nano reagent is a single particle size.
When the magnetic nano reagent has a certain particle size distribution, the above method will have a large temperature measurement error

Method used

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  • Temperature measurement method based on magnetic nano magnetization intensity
  • Temperature measurement method based on magnetic nano magnetization intensity

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] Simulation example 1: (DC)

[0077] 1. Simulation model and test description:

[0078] In order to study the superiority of the magnetic nano temperature measurement optimization method under the excitation of DC or triangular wave magnetic field, the magnetic field strength is 5Gs, 10Gs, 15Gs, 20Gs, 25Gs, the temperature is 300K to 380K, the noise is 80dB, and the particle size distribution expectation E(D)=8nm , standard deviation and 2nm ( figure 2 , image 3 ), compared the simulation experiment with the original magnetic nano temperature measurement method and the magnetic nano temperature measurement optimization method of the present invention, and the simulation results are as follows Figure 4 with Figure 5 .

[0079] 2. Simulation test results:

[0080] Figure 4 It reflects the temperature measurement error of the original temperature measurement method when the magnetic nanoparticles have a particle size distribution when the excitation magnetic fi...

example 2

[0082] Simulation example 2: (communication)

[0083] 1. Simulation model and test description:

[0084] In order to study the superiority of the magnetic nanometer temperature measurement optimization method under the excitation of the AC magnetic field, the magnetic field strength is 20Gs, the frequency is 160Hz, the temperature is 300K to 380K, the noise is 80dB, the particle size distribution expects E(D)=20nm, and the standard deviation , compared the original magnetic nanometer temperature measurement method and the optimized method of magnetic nanometer temperature measurement by simulation experiments. The simulation results are as follows: Image 6 with Figure 7 .

[0085] 2. Simulation test results:

[0086] Image 6 It reflects the temperature measurement error of the original temperature measurement method when the magnetic nanoparticles have a particle size distribution when the excitation magnetic field is an AC magnetic field. It can be seen that when the...

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Abstract

The invention discloses a temperature measurement method based on magnetic nano magnetization intensity. The temperature measurement method is characterized in that the effect of the particle size distribution of a magnetic nano reagent on temperature measurement is considered; accurate temperature measurement is realized in the presence of unknown magnetic nano particle size distribution; when a direct current magnetic field is applied on the magnetic nano reagent, magnetization intensity signals under different magnetic field intensity excitations are detected; the relationship among magnetic nano particle magnetization intensity, temperature, concentration and particle size high order moments is used to accurately solve the temperature; when an alternating current magnetic field is applied on the magnetic nano reagent, an alternating current magnetization intensity signal is acquired, and first and third harmonic amplitudes are detected; and the relationship among first and third harmonic amplitudes of alternating current magnetization intensity, temperature, concentration and particle size high order moments is used to accurately solve the temperature. According to the invention, the temperature measurement method based on single particle size and magnetic nano magnetization intensity is optimized and improved; and from experimental data, the temperature error of the magnetic nano temperature measurement optimized method is less than 0.2K.

Description

technical field [0001] The invention relates to the technical field of nanometer testing, in particular to a temperature measurement method based on magnetic nanometer magnetization. Background technique [0002] The temperature measurement method based on magnetic nano magnetization is a booming temperature measurement method. In 2009, J.B. Weaver realized the magnetic nano temperature measurement technology by using the third harmonic and fifth harmonic amplitude ratio of magnetic nano particles AC magnetization . In 2012, based on the Langevin magnetization model, Liu Wenzhong et al. used the reciprocal of magnetic susceptibility of magnetic nanoparticles under DC magnetic field excitation to realize magnetic nanometer temperature measurement. In the same year, under the excitation of AC magnetic field, Liu Wenzhong and others realized the temperature measurement of magnetic nanometer by using the harmonic amplitude of the AC magnetization of magnetic nanoparticles, whic...

Claims

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Application Information

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IPC IPC(8): G01K7/36G06F19/00
Inventor 刘文中皮仕强毛文平何乐张朴
Owner HUAZHONG UNIV OF SCI & TECH
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