Temperature measurement method based on ferromagnetic resonance frequency
A ferromagnetic resonance and temperature measurement technology, which is applied in the direction of thermometers, thermometers, and measuring devices that use electrical/magnetic components directly sensitive to heat, which can solve the problems of increasing the complexity of measurement and processing, long measurement time, and complex temperature measurement models. and other problems, to achieve the effect of quick and easy measurement, simple measurement method and simple model form
Active Publication Date: 2021-12-21
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology
[0004] 1. Temperature measurement is based on the temperature dependence of the reciprocal of magnetic susceptibility of ferromagnetic nanoparticles magnetized under a static magnetic field, but the measurement time of this method is long, and it is difficult to meet the application requirements of rapid temperature measurement
[0005] 2. Temperature measurement based on the temperature dependence of the magnetization of ferromagnetic nanoparticles excited by a single-frequency AC magnetic field, but this method needs to measure the higher harmonics of the magnetization response of ferromagnetic nanoparticles, which increases the difficulty of measurement
[0006] 3. Temperature measurement based on the relationship between the homogeneous or even harmonic amplitude and temperature of the magnetization response of ferromagnetic nanoparticles, but the corresponding temperature measurement model is complex, which increases the complexity of measurement and processing
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[0051] In order to verify the feasibility of the above-mentioned temperature measurement method based on ferromagnetic resonance frequency, the inventor designed a simulation experiment according to the content of the invention to repeatedly verify the method. A specific example is used to illustrate:
[0052] Put the object to be tested with ferromagnetic nanoparticles into the magnetic induction intensity of μ 0 h 0 =2T in the static magnetic field.
[0053] A certain amplitude of magnetic induction intensity μ is generated by a microwave source 0 h 1 =10 -4 T microwave pulse excitation, pulse width T p Controlled at 1.5ps, through the microwave circulator, in the direction perpendicular to the static magnetic field, microwave pulse excitation is applied, and the magnetic field strength of the static magnetic field is H 0 Under the condition that the size of λ is constant, the microwave frequency f is constantly changed, and the resonant absorption signal is detected by...
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Abstract
The invention relates to a temperature measurement method based on ferromagnetic resonance frequency. The method comprises the following steps: applying a static magnetic field to a measured object containing a ferromagnetic nanoparticle solution to saturate and magnetize ferromagnetic nanoparticles; applying an alternating pulse excitation magnetic field along the vertical direction of the static magnetic field; determining the ferromagnetic resonance frequency of the ferromagnetic nanoparticles during ferromagnetic resonance through a frequency sweep method; and calculating the temperature of the measured object according to the determined ferromagnetic resonance frequency, wherein the calculation formula is shown in the specification: according to the method provided by the invention, the temperature is measured through the constructed relation model of the ferromagnetic resonance frequency and the temperature, the model is simple in form, the measurement method is simple and convenient, the internal temperature of the measured object can be rapidly and conveniently measured, and the measurement accuracy is very high.
Description
technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a temperature measurement method using ferromagnetic nanoparticles. Background technique [0002] Temperature is an important indicator reflecting the internal state of the measured object, and its accurate and fast measurement is very important in many cases. Temperature measurement methods can generally be divided into contact temperature measurement and non-contact temperature measurement. Compared with contact temperature measurement, non-contact temperature measurement can obtain more accurate temperature measurement because it will not destroy the temperature field of the measured object. result. [0003] Due to their unique magnetic properties, ferromagnetic nanoparticles have been used in temperature measurement in many fields and occasions, and because ferromagnetic nanoparticles are nanoscale, they are suitable for non-contact temperature measurement. ...
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IPC IPC(8): G01K7/38
CPCG01K7/38Y02A90/30
Inventor 苏日建王亚斌杜中州刘文中张秋闻黄臻
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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