A temperature measurement method based on the AC magnetic susceptibility of magnetic nanoparticles
A technology of magnetic nanoparticles and AC magnetic susceptibility, applied in the field of nano-testing, can solve the problems of lack of theoretical and experimental research, and achieve the effects of simple data processing model, noise suppression, and simple measurement methods
Active Publication Date: 2017-06-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
However, due to the lack of perfect theoretical model research and sufficient experimental research, the magnetic nanometer temperature measurement technology is not yet mature, especially the real-time precise temperature measurement technology lacks sufficient theoretical and experimental research.
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[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0032] Such as figure 1 As shown, the present invention proposes a temperature measurement method of magnetic nanoparticles based on AC susceptibility under AC excitation magnetic field, and the specific steps are:
[0033] (1) Determine the area of the object to be measured, and apply an AC excitation magnetic field to the area to be measured using an energized solenoid;
[0034] (2) Use the detection co...
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Abstract
The invention discloses a temperature measurement method based on the AC magnetic susceptibility of magnetic nanoparticles. The method includes the following steps: (1) determining the area of the object to be measured, and applying an AC excitation magnetic field to the area to be measured by using an energized solenoid; (2) )Use the detection coil to collect the magnetic induction intensity H1 of the area to be measured under the AC excitation magnetic field; (3) Keep the AC excitation magnetic field constant, place the magnetic nano sample in the area to be measured of the object to be measured, and use the detection coil to collect and apply the magnetic nano sample The magnetic induction intensity H2 of area to be measured afterwards; (4) calculate the real part χ ' and imaginary part χ " of the AC magnetic susceptibility χ of magnetic nanoparticles; wherein A1, A2, α are all obtained by previous detection signal H1, H2; (5) Calculate the effective relaxation time τ of the magnetic nanoparticles, and then obtain the temperature T. The non-invasive measurement can be realized by the method of the present invention.
Description
Technical field [0001] The invention belongs to the technical field of nanometer testing, and more specifically relates to a temperature measurement method based on the alternating magnetic susceptibility of magnetic nano particles. Background technique [0002] Temperature is one of the most basic physical quantities of matter in nature. The measurement of temperature is of great significance for understanding the nature of matter in nature. The magnetic nanometer temperature measurement method is a new, non-contact temperature measurement method. It mainly measures the AC susceptibility of magnetic nanoparticles and calculates temperature information through a certain model relationship. The non-invasive nature of the magnetic nanoparticle temperature measurement method makes it has a wide range of application prospects in some special environments. [0003] Unfortunately, although the current temperature (field) measurement technology in the normal environment has the characte...
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IPC IPC(8): G01K7/36
Inventor 彭翔宇刘文中何乐
Owner HUAZHONG UNIV OF SCI & TECH