Magnetothermal effect-based magnetic field measurement method, magnetic field sensor and preparation method

A magnetic field sensor and magnetic field measurement technology, which is applied in the direction of the size/direction of the magnetic field, can solve the problems that are not suitable for high-frequency and high-amplitude magnetic field measurement, and the magnetic field range is small, and achieve simple structure, change sensitivity, and optimize size design Effect

Active Publication Date: 2019-11-15
CHONGQING UNIV
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Benefits of technology

This technology proposes an improved way to measure very small magneents with great accuracy over large areas without being bulky or expensive equipment. It also allows for flexible use within different situations while maintaining its precision level. Additionally, there are technical advantages such as reducing particle sizes and simplifying the process used during production compared to current methods that require multiple components like coils or wires.

Problems solved by technology

This patented describes how magnefield detectors use special materials called iron ferrooxides or ceramic particles attached onto rings made from glass fiber material. These materials absorb light when excited during certain conditions like electrical currents flow through them. By measuring changes caused by these absorption, they could help identify things nearby without physically touching those objects themselves.

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  • Magnetothermal effect-based magnetic field measurement method, magnetic field sensor and preparation method
  • Magnetothermal effect-based magnetic field measurement method, magnetic field sensor and preparation method
  • Magnetothermal effect-based magnetic field measurement method, magnetic field sensor and preparation method

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Embodiment Construction

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0025] This embodiment proposes a magnetic field measurement method based on the magnetocaloric effect. Specifically, an optical waveguide is placed in the magnetic field to be measured, and ferric oxide nanoparticles are filled on both sides of the optical waveguide, and the initial temperature of the ferric oxide nanoparticles is obtained. Apply the transverse electric TE or transverse magnetic TM fundamental mode polarization state at the input end of the optical waveguide and monitor the temperature change of the ferroferric oxide nanoparticles in real time, and obtain the magnetic field strength according to the following formula:

[0026]

[0027] Among them: ΔT

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Abstract

The invention discloses a magnetothermal effect-based magnetic field measurement method. The method is mainly characterized in that magnetic energy is absorbed in an alternating magnetic field to generate heat by using ferroferric oxide nanoparticles, and the total effective refractive index of a waveguide is changed, so that an output resonance peak of a magnetothermal effect-based silicon micro-ring magnetic field sensor shifts to achieve magnetic field measurement. The method has the advantage that the magnetic field measurement range is improved. Meanwhile, the invention provides a magnetic field sensor based on the method; the size of a traditional magnetic field sensor is reduced by using the advantages of a high quality factor of the magnetic field sensor and the magnetothermal effect of the magnetic nanoparticles; a solid foundation is laid for integration, intelligentization and miniaturization of the magnetic field sensor; meanwhile, the structure is simple; the sensitivity of the sensor can be changed through optimizing the size design of the sensor and the properties of the magnetic nanoparticles; and the magnetic field sensor is flexibly applicable to various scenarios. Meanwhile, the invention provides a magnetic field sensor-based preparation method, and the preparation method has the advantage that the manufacturing efficiency is improved.

Description

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Claims

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Application Information

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Owner CHONGQING UNIV
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