Magnetic field measurement method, magnetic field sensor and preparation method based on magnetocaloric effect
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 of small magnetic field range, unsuitable for high-frequency and high-amplitude magnetic field measurement, etc., and achieve changes in sensitivity, simple structure, and improved manufacturing efficiency. Effect
Active Publication Date: 2021-07-20
CHONGQING UNIV
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[0004] Chinese patent 201910357331.3 proposes a magnetic field sensor based on a silicon-based microring resonator. The technical means is to install a magneto-optic film on the inside and above the ring waveguide, but the range of the magnetic field that can be measured by this technical means is small, and it is not suitable for High-frequency and high-amplitude magnetic field measurement
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[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: ...
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Abstract
The invention discloses a magnetic field measurement method based on the magnetocaloric effect, which mainly uses iron ferric oxide nanoparticles to absorb magnetic energy in an alternating magnetic field to generate heat and change the total effective refractive index of the waveguide so that the silicon-based magnetocaloric effect The output resonant peak of the micro-ring magnetic field sensor drifts to realize the magnetic field measurement. This method has the advantage of improving the magnetic field measurement range. At the same time, a magnetic field sensor based on this method is proposed, taking advantage of its high quality factor and the magnetocaloric effect of magnetic nanoparticles , reduces the size of the traditional magnetic field sensor, and lays a solid foundation for the integration, intelligence, and miniaturization of the magnetic field sensor. At the same time, the structure is simple. By optimizing the size design of the sensor and the properties of the magnetic nanoparticles, the sensitivity of the sensor can be changed. , flexibly applicable to various scenarios, and simultaneously provides a preparation method based on a magnetic field sensor, which has the advantage of improving manufacturing efficiency.
Description
technical field [0001] The invention relates to the technical field of micro-nano optical magnetic field sensing, in particular to a magnetic field measurement method based on magnetocaloric effect, a magnetic field sensor and a preparation method. Background technique [0002] Magnetic field sensors are widely used in daily life, such as power system, aerospace, automobile industry, medical biochemistry and other fields. With the development of AC ultra-high voltage transmission and transformation at any time, the detection of magnetic fields around substations and transmission lines is of great significance to the safe operation of the power grid. [0003] In recent years, with the development of micro-electromechanical systems (MEMS) and other technologies, MEMS technology has become a high-tech industry with great potential. Integrated optical sensors have been widely used in physical, chemical and biological sensing applications, which can achieve high-sensitivity dete...
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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 杨庆罗曼丹何彦霄刘仁远
Owner CHONGQING UNIV