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Enhanced-type echo-wall mode optical resonant cavity magnetic field sensing system

A technology of optical resonant cavity and whispering gallery mode, which is applied in the field of optics and can solve problems such as inability to meet high-precision measurement requirements

Active Publication Date: 2017-08-04
浙江知多多网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of magnetic field sensor application requirements, many times the existing optical resonant cavity magnetic field sensing system has been unable to meet the high-precision measurement requirements

Method used

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  • Enhanced-type echo-wall mode optical resonant cavity magnetic field sensing system

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specific Embodiment approach 1

[0015] Specific implementation mode one: as figure 1 As shown, a WGM optical resonant cavity magnetic field sensing system containing a magnetic fluid and a magnetostrictive medium described in this embodiment includes a broadband light source 1, an isolator 2, an attenuator 3, a polarization controller 4, and a fiber optic cone 5. WGM optical resonant cavity structure S containing magnetic fluid and magnetostrictive medium, spectrometer 11. The WGM optical resonant cavity structure S containing magnetic fluid and magnetostrictive medium includes a hollow WGM optical bubble-like resonant cavity 6 that can be filled with a medium inside, magnetostrictive medium particles 7, glue 8, magnetic fluid 9, and a packaged box of 10. The transmitting end of the broadband light source 1 is connected to the input end of the isolator 2, the output end of the isolator 2 is connected to the input end of the attenuator 3, the output end of the attenuator 3 is connected to the input end of th...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 1 This embodiment is described. This embodiment is a further limitation of the WGM optical resonant cavity magnetic field sensing system containing magnetic fluid and magnetostrictive medium described in Embodiment 1. The resonant cavity 6 is first filled with a magnetostrictive Stretch medium particles 7, fill the middle air bubbles with as many magnetostrictive medium particles 7 as possible, and then use ultraviolet curing glue 8 to fill the gap, use ultraviolet light to cure the glue in the cavity, and fix it in the box 10. Use the light cone 5 to couple light into the resonant cavity 6, slowly add the magnetic fluid 9 into the box 10, adjust the position of the fiber cone, and keep the coupling state between the fiber cone 5 and the resonant cavity 6. Then, drip UV-curable glue at the contact position between the fiber cone and the box 10, continue to adjust the position of the fiber cone 5 to the best coupling s...

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Abstract

The invention provides an enhanced-type echo-wall mode optical resonant cavity magnetic field sensing system. A transmitting end of a broadband light source of the system is connected with an input end of an isolator, and the output end of the isolator is connected with the input end of an attenuator. The output end of the attenuator is connected with the input end of a wavelength scale optical fiber taper, and an optical fiber between the output end of the attenuator and the input end of the wavelength scale optical fiber taper is provided with a polarization controller. The wavelength scale optical fiber taper and a WGM optical resonant cavity structure which comprises magnetic fluid and a magnetostriction medium enable a light field in the optical fiber taper to be coupled to enter and come out of the resonant cavity in a mode of optical evanescent wave coupling. The output end of the optical fiber taper is connected with the receiving end of a spectrometer. According to the invention, the system introduces two magnetic field conversion mediums at the same time: the magnetic fluid and the magnetostriction medium, and the magnetic field conversion mediums will change the optical output characteristic of the WGM resonant cavity under the action of a magnetic field. The magnetic field conversion mediums act jointly to improve the magnetic field measurement precision of the WGM optical resonant cavity.

Description

technical field [0001] The invention relates to a high-sensitivity optical resonant cavity magnetic field sensing system, in particular to a whispering gallery mode (Whispering gallery mode, WGM) optical resonant cavity magnetic field sensing system containing ferrofluid and magnetostrictive medium, belonging to optical field. Background technique [0002] Magnetic field sensors are indispensable basic components in the information industry, and are widely used in industrial automation, transportation, power electronics technology, office automation, household appliances, medical instruments and other industries. Among them, the magnetic field sensor based on optical resonant cavity is expected to play an important role in the field of magnetic field sensing due to its advantages of easy integration, low power consumption, high sensitivity and broadband. With the development of the application requirements of magnetic field sensors, the existing optical resonant cavity magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032G01R33/0327
Inventor 于长秋钱正洪白茹朱华辰
Owner 浙江知多多网络科技有限公司
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