A temperature measurement method based on magnetic nano magnetization
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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: 2016-11-30
HUAZHONG UNIV OF SCI & TECH
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[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
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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 and 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 fie...
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: Figure 6 and Figure 7 .
[0085] 2. Simulation test results:
[0086] Figure 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 th...
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Abstract
The invention discloses a temperature measurement method based on the magnetization of magnetic nanometers. The main innovation of the method is that the influence of the particle size distribution of magnetic nanometer reagents on temperature measurement is considered, and the precise temperature measurement under the condition of unknown magnetic nanometer particle size distribution is realized. When a DC magnetic field is applied to the magnetic nano reagent, the magnetization signal under the excitation of different magnetic field strengths is detected; the temperature is accurately calculated by using the relationship between the magnetization of the magnetic nanoparticle and the temperature, concentration, and high-order moment of the particle size. When an AC magnetic field is applied to the magnetic nano reagent, the AC magnetization signal is collected, and the first and third harmonic amplitudes are detected; the relationship between the first and third harmonic amplitudes of the AC magnetization and temperature, concentration, and high-order moment of particle size is used Accurately solve for temperature. The invention optimizes and improves the temperature measurement method based on the magnetization intensity of magnetic nanometers based on a single particle size. From the experimental data, the temperature error of the optimized method for magnetic nanometer temperature measurement 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...
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