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Magnetic field sensing device based on tellurate optical fiber Faraday rotation effect and using method thereof

A Faraday rotation and sensing device technology, which is applied in the use of magneto-optical equipment for magnetic field measurement, measurement device, magnetic field size/direction, etc. Achieving the effect of avoiding external environmental influence, improving sensitivity and high sensitivity

Active Publication Date: 2021-02-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although traditional magnetic field sensors have relatively mature technologies and can meet various sensitivity requirements, there are many limiting factors in practical applications.
For example, the electrical magnetic field sensing system uses an active metal cable for signal transmission, which is very easy to interfere with the distribution of the measured magnetic field, so it is quite sensitive to external magnetic field noise
In addition, traditional sensors have complex structures, large volumes, narrow frequency bands, small dynamic ranges, high costs, and excessive environmental requirements. Therefore, traditional magnetic field sensors have been difficult to meet the growing technological needs, and more new magnetic field sensors with better performance are needed. being constantly explored and researched

Method used

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  • Magnetic field sensing device based on tellurate optical fiber Faraday rotation effect and using method thereof
  • Magnetic field sensing device based on tellurate optical fiber Faraday rotation effect and using method thereof
  • Magnetic field sensing device based on tellurate optical fiber Faraday rotation effect and using method thereof

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Embodiment 1

[0049] This embodiment provides a magnetic field sensing device based on the Faraday rotation effect of tellurate optical fiber, the structure is as follows figure 1 shown. The magnetic field sensing device provided in this embodiment is mainly composed of 8 parts, namely: a light source module 1, a collimator lens 2, a polarizer 3, a focusing lens 4, a tellurite optical fiber 5, and a magnetic field 6 parallel to the axis of light , a polarizer 7, and a detection module 8.

[0050] Wherein, the light source module 1 is located on one side of the collimating lens 2, and on the other side of the collimating lens 2, a polarizer 3, a focusing lens 4, a tellurite optical fiber 5, and an analyzer 7 are sequentially arranged, and the analyzer 7 It is connected with the detection module 8, wherein the horizontal centerlines of the light source module 1, the collimating lens 2, the polarizer 3, the focusing lens 4, the tellurate fiber 5 and the analyzer 7 coincide, and the tellurate ...

Embodiment 2

[0064] The present invention is based on the Faraday rotation effect of the magneto-optical medium under the magnetic field, and the rotation angle of the polarization plane of the magneto-optical medium under the magnetic field is related to the magnetic field component parallel to the light transmission direction, the length of the magneto-optical medium and the Verdet constant (V) of the magneto-optical medium . When other parameters are constant, the larger V is, the larger the Faraday rotation angle is. Therefore, choosing a magneto-optical medium with a larger Feld coefficient is beneficial to obtain higher sensitivity. According to Larmor frequency and circular birefringence, the expression of Feld constant can be obtained as:

[0065]

[0066] Among them, e is the charge of the electron, m is the mass of the electron, c is the speed of light in vacuum, λ is the wavelength, and dn / dλ is the dispersion of the magneto-optical medium. It can be obtained from the above...

Embodiment 3

[0070] In this embodiment, on the basis of embodiments 1 and 2, a coreless optical fiber structure is used to compare and analyze the sensing properties of tellurite materials and quartz materials. The diameter of the optical fiber used is 125 μm, the length is 20 cm, and the range of the parallel uniform magnetic field is 0-1T. According to the Faraday effect, the Faraday rotation angle (θ) of the optical fiber under the magnetic field can be expressed by the following formula:

[0071] θ = VBL

[0072] Where V is the Verdet constant, B is the magnetic field strength, and L is the length of the fiber.

[0073] The operating wavelength of the sensor is based on the operating wavelength of commercial lasers. Eight commonly used wavelengths were selected for analysis, which are 442nm, 543nm, 633nm, 753nm, 850nm, 980nm, 1060nm, and 1550nm. Based on the Faraday rotation angle of tellurate coreless fiber and quartz coreless fiber, according to the change of magnetic field, they ar...

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Abstract

The invention discloses a magnetic field sensing device based on a tellurate optical fiber Faraday rotation effect and a using method thereof, and belongs to the technical field of optical fiber sensing. The magnetic field sensing device based on the tellurate optical fiber Faraday rotation effect comprises a light source module, a collimating lens, a polarizer, a focusing lens, a tellurate optical fiber, an analyzer and a detection module, wherein the horizontal center lines of the light source module, the collimating lens, the polarizer, the focusing lens, the tellurate optical fiber and theanalyzer coincide; and the Faraday rotation effect of the tellurate optical fiber in the magnetic field is used for measuring the magnetic field. The invention further provides a using method of themagnetic field intensity detection of the magnetic field sensing device based on the tellurate optical fiber Faraday rotation effect. The magnetic field sensing device based on the tellurate optical fiber Faraday rotation effect is small in size, high in sensitivity, resistant to high temperature, resistant to electromagnetic interference and capable of detecting low magnetic field intensity, remote detection can be conducted, and the change of the magnetic field caused by environmental influences is avoided.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a magnetic field sensing device based on the Faraday rotation effect of tellurate optical fiber and its usage method. Background technique [0002] With the development of modern science and technology, as a detection device that can convert the measured signal into other forms of information output, the sensor is widely used in many scientific research fields such as engineering, chemistry, biomedicine, military, aerospace, and production and life. widely used. As we all know, in the field of military and civilian use, the electromagnetic field existing in nature and the electromagnetic environment caused by human factors will have a serious impact on electrical and electronic equipment and related systems. Safety is of great significance, and the related measurement research of magnetic field has become a research hotspot in the electromagnetic field ...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/0322
Inventor 程同蕾张帆李斌孙悦李曙光闫欣张学楠王方
Owner NORTHEASTERN UNIV
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