Magnetic ion liquid-filled micro-structure optical fiber magnetic field sensor

A technology of magnetic ionic liquid and micro-structure optical fiber, which is applied in the direction of magnetic field measurement, magnetic field size/direction and other directions using magneto-optical equipment, can solve problems such as limiting the application field and affecting the accuracy of magnetic field measurement, and achieve high-sensitivity measurement and realization Intensity demodulation, high sensitivity effect

Inactive Publication Date: 2018-01-19
NANKAI UNIV
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Problems solved by technology

The magnetic response of ferrofluid is mainly due to the magnetic nanoparticles dispersed in it, but the response of the base fluid to the external environment will affect the measurement accuracy of the magnetic field, which also limits its application field.

Method used

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  • Magnetic ion liquid-filled micro-structure optical fiber magnetic field sensor
  • Magnetic ion liquid-filled micro-structure optical fiber magnetic field sensor
  • Magnetic ion liquid-filled micro-structure optical fiber magnetic field sensor

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Embodiment Construction

[0027] The specific implementation of the magnetic ionic liquid filled microstructure optical fiber magnetic field sensor is as follows figure 2 As shown, it includes micro-structured optical fiber, magnetic ionic liquid and single-mode optical fiber. The optical fiber magnetic field sensor is similar to a "sandwich" structure. The micro-structured optical fiber 1 is in the middle, and the two ends are single-mode optical fibers 9. The air holes are filled with magnetic ionic liquid 2. The magnetic ionic liquid responds to the external magnetic field. It is a substance composed of ions that is liquid at or near room temperature. The magnetic ionic liquid column filled into the optical fiber can realize the excitation of multiple high-order modes and realize the ionization. The mutual coupling between the mode in the liquid column and the core mode, the mode coupling increases the mode field distribution area of ​​the core mode, and realizes the direct contact between the optica...

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Abstract

The invention relates to a magnetic ion liquid-filled micro-structure optical fiber magnetic field sensor. The working principle of the sensor includes that a fiber core mode and an ion liquid columnmode are coupled by the aid of a refractive index matching and coupling principle, the transmission light attenuation coefficient of ion liquid is changed along with increase of the strength of an external magnetic field when the transmission direction of transmission light is perpendicular to the direction of the magnetic field, the attenuation coefficient of the magnetic ion liquid is changed under different magnetic field strengths, spectrum harmonic peak strength is obviously changed, and the strength change of the external magnetic field can be accurately measured. The sensor can be usedfor implementation of novel optical fiber magnetic field sensor research work. Compared with a past reported optical fiber magnetic field sensor, the sensor has the advantages that the property of themagnetic ion liquid is more stable than that of magnetic fluids, measuring results cannot be affected by base fluid property fluctuation, and the sensor has higher accuracy.

Description

Technical field [0001] The invention belongs to the field of optical fiber sensing, and specifically relates to a test method for external magnetic field changes and functional reassembly of a microstructure optical fiber magnetic field sensor based on magnetic ionic liquid filling. Background technique [0002] The magnetic field is an objective field that transmits the magnetic force between magnetic objects, and is a basic physical quantity in physics. Due to the importance of magnetic fields in the field of navigation, geophysics and modern safety monitoring, the measurement of external magnetic fields has become a research hotspot in recent years. Researchers have proposed various magnetic field measurement methods, including: planar fluxgate, Huo Er effect, superconducting magnets, nuclear magnetic resonance, thermoelectric spin valve, and optical fiber magnetic field sensors that have been gradually developed in recent years. Compared with traditional magnetic field measu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
Inventor 王志梁鹄刘艳格刘波张昊李宏业王振洪
Owner NANKAI UNIV
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