Device for measuring magnetic field intensity of millimeter-level planar square inductor

A technology of magnetic field strength and measuring device, which is applied in the field of biomedical engineering and can solve problems such as difficulty in measuring magnetic field strength

Pending Publication Date: 2022-04-01
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

In 2018, Liu et al. proposed a weak magnetic field detection method based on an optoelectronic mechanical system, with a measurement accuracy of 0.1nT, and the magnetic field measurement frequency and amplitude range were not mentioned
Due to the small size of the micro-coil and the weak magnetic field, and the measurement process requires precise control of the horizontal position between the detection coil and the measured coil, it brings difficulties to the measurement of the magnetic field strength

Method used

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  • Device for measuring magnetic field intensity of millimeter-level planar square inductor

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] Step 1: Design and build the mechanical structure of the microcoil magnetic field detection device, which mainly includes three parts: signal source module, detection module and microcoil module.

[0031] The second step: deduce the calculation formula of the mutual inductance coefficient of two planar square spiral coils;

[0032] Step 3: Use COMSOL finite element to construct the mutual inductance model of the excitation coil and detection coil, select Coil_1 and Coil_2 for the excitation coil, and select Coil_1, Coil_2, Coil_3, Coil_4 and Coil_5 for the detection coil;

[0033] The fourth step: comparative analysis of the theoretical value and modeling value of the mutual inductance coefficient;

[0034] Step 5: Measure the magnetic field strength of the planar square helical coil with a size of 5.5mm×5.5mm (Coil_2), and input a sinusoidal signal of 10-87.5mV, 70kHz;

[0035] Step 6: Measure the magnetic field strength of the plane square helical coil with a size of...

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Abstract

The invention discloses a device for measuring the magnetic field intensity of a millimeter-level planar square inductor, belongs to the field of biomedical engineering, and realizes that the measurement error of the magnetic field intensity is 0.05 mT and the relative error is 2.38% when the size proportion SDC/SEC of a detection coil to an excitation coil is greater than or equal to 1 and less than 3. The method comprises the steps that a millimeter-level planar square inductance magnetic field intensity measuring device is built, a calculation formula of the mutual inductance coefficient of a planar square spiral coil is derived, a mutual inductance model between an excitation coil and a detection coil is built through COMSOL, and the magnetic field intensity of two millimeter-level micro coils with the size being 3.6 mm * 3.6 mm and the magnetic field intensity of two millimeter-level micro coils with the size being 5.5 mm * 5.5 mm are measured.

Description

technical field [0001] The invention belongs to the technical field of biomedical engineering, and in particular relates to a device for measuring the magnetic field strength of a millimeter-level plane square inductor. Background technique [0002] Micro-magnetic stimulation (μMS) is an emerging neurostimulation technology that promises to revolutionize therapeutic stimulation of the human nervous system. This technology uses millimeter-scale micro-inductors to pass a time-varying current to generate a magnetic field in the focal area of ​​the tissue to achieve stimulation. In 2014, Yang et al. designed a high-frequency pulsed magnetic field measurement device based on Faraday's electromagnetic induction principle, with a measurement frequency of 20-30kHz and an amplitude of 10-20mT. In 2009, Miyagi et al. developed a high magnetic flux flow measurement system using silicon steel sheets, with a measurement strength of over 2T. In 2013, Chen et al. studied the high-frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/07
Inventor 田磊郑羽刘绮雯
Owner TIANJIN POLYTECHNIC UNIV
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