CN111579847A - Double-enhancement current sensing system based on micro fiber junctions and magnetic fluid - Google Patents
Double-enhancement current sensing system based on micro fiber junctions and magnetic fluid Download PDFInfo
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- CN111579847A CN111579847A CN202010364695.7A CN202010364695A CN111579847A CN 111579847 A CN111579847 A CN 111579847A CN 202010364695 A CN202010364695 A CN 202010364695A CN 111579847 A CN111579847 A CN 111579847A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a double-enhancement current sensing system based on a microfiber junction and a magnetofluid, wherein an optical signal output by a broadband light source enters an optical fiber resonant cavity through optical fiber connection, and is output to a spectrometer for observation after entering a light field of the resonant cavity for transmission, and a copper wire generating a current signal is firmly contacted with the outer diameter of the optical fiber resonant cavity; the broadband light source is connected with the optical fiber, the optical fiber resonant cavity is connected with the spectrometer through the optical fiber, the resonant cavity is fixed in the magnetic fluid through the low-refractive-index ultraviolet curing glue, the resonant cavity, the magnetic fluid and the optical fiber resonant cavity are fixed in position, and the refractive index value of the low-refractive-index ultraviolet curing glue ensures that an optical field is transmitted in the resonant cavity without loss. The invention has the advantages of low cost, low power consumption, small volume, high precision, easy integration, high-precision detection of current signals and the like.
Description
Technical Field
The invention relates to a current sensing system for realizing high precision based on magnetofluid current measurement, in particular to a current sensing system constructed by a magnetic fluid material and an optical resonant cavity, and belongs to the field of optics.
Background
Due to their unique optical properties, microfibers attract a great deal of attention, and many research efforts are directed to the development of optical resonators based on microfibers and many potential applications, including the optical fields of tunable fiber lasers and fiber sensors. The double-enhancement current sensing system based on the micro fiber junctions and the magnetic fluid is provided, the current sensing sensitivity is improved by comprehensively utilizing two modes of temperature change and additional magnetic fluid on the basis of the existing current sensing, and the double-enhancement current sensing system can be widely applied to the fields of national defense, aerospace, automotive electronics, medical treatment, energy, consumer electronics, industrial control and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a double-enhancement current sensing system based on a microfiber junction and a magnetic fluid, which can be used in the field of current signal detection requiring high-sensitivity measurement and low-frequency current detection capability.
A double-enhancement current sensing system based on a microfiber junction and a magnetofluid comprises a broadband light source, an optical fiber resonant cavity, the magnetofluid, a low-refractive-index ultraviolet curing adhesive and a spectrometer;
the optical signal output by the broadband light source is transmitted to an input port of the optical fiber resonant cavity through an optical fiber, an optical field in the optical fiber resonant cavity is transmitted to the spectrometer through the optical fiber after being transmitted for multiple times, and the magnetic fluid is fixed on the outer side surface of the optical fiber resonant cavity through the low-refractive-index ultraviolet curing adhesive; the outer side of the optical fiber resonant cavity is provided with a copper wire which is electrified with direct current, and the optical fiber resonant cavity is formed by knotting microfibers; the change of an external magnetic field by a copper wire with direct current leads to the change of the refractive index of the magnetic fluid, so that the effective refractive index of the optical fiber resonant cavity, namely the optical path, changes, the temperature change can be caused by a current signal flowing through the copper wire, the resonance frequency of an optical signal in the optical fiber resonant cavity is changed, the change of the refractive index and the optical path length of the optical fiber resonant cavity is influenced, and therefore the transmission spectrum of the cavity measured on the spectrometer contains current information, and the intensity information of the current is demodulated through data processing; the positions of the resonant cavity, the magnetic fluid and the optical fiber resonant cavity are fixed; the refractive index value of the ultraviolet curing glue with low refractive index ensures that the optical field is transmitted in the resonant cavity without loss.
Preferably, the magnetic fluid contains Fe3O4The colloidal solution of (a) or other magnetic materials capable of changing the refractive index under the action of a magnetic field.
Preferably, the method for improving the current sensing sensitivity is that the wavelength displacement in the cavity is changed by heat released by current flowing through a copper wire, and the magnetic fluid is added to increase the sensing precision.
Preferably, the effect of heat on the resonant cavity parameters is controlled by adjusting the magnitude of the current flowing through the copper wire.
Preferably, the resonant cavity is formed by knotting silicon fibers prepared by adopting a flame electric brush technology.
Preferably, the optical fiber resonant cavity is embedded in the magnetic fluid, or the resonant cavity is adhered to the magnetic fluid.
Preferably, the resonant cavity is made of a silicon microfiber material and is in the shape of an annular cavity or a microsphere cavity; the resonant cavity is capable of supporting the transmission of light waves and has evanescent waves at the outer surface of the cavity.
Preferably, the magnetic fluid is in the shape of a cylinder, a flat plate or a helmet.
Preferably, the microfibers are coupled to a length of at least 3 millimeters to achieve sufficient van der Waals forces to join two microfibers together.
Preferably, the optical fiber is designed to ensure low loss transmission and easy detection of optical signals in the selected wavelength band.
Preferably, the optical fiber resonant cavity is replaced by a double-ring resonant cavity and an embedded micro-cavity.
The current sensing system comprehensively utilizes temperature and magnetofluid to detect current signals, and has high sensing sensitivity. Meanwhile, the system is mainly constructed by optical fibers, has small volume and easy integration, and can be used for remotely detecting current information.
Drawings
FIG. 1 is a schematic structural diagram of an inventive dual enhanced current sensing system based on micro fiber junctions and magnetic fluid;
Detailed Description
The essential features and the remarkable advantages of the present invention will be further clarified by the following embodiments, but the contents of the present invention are not limited to the following embodiments:
as shown in fig. 1, the dual-enhancement current sensing system based on the micro fiber junction and the magnetic fluid according to the present embodiment includes a broadband light source 1, a fiber resonator 2, a magnetic fluid 3, a low refractive index uv curable adhesive 4, and a spectrometer 5. An optical signal output by the broadband light source 1 is sent to an input port of the optical fiber resonant cavity 2 through an optical fiber, an optical field in the cavity is transmitted to the spectrometer 5 through the optical fiber after being transmitted for multiple times, the magnetic fluid 3 is fixed on the outer side of the resonant cavity by using the low-refractive-index ultraviolet curing adhesive 4 for one circle, the change of an external magnetic field can cause the change of the refractive index of the magnetic fluid 3, and further cause the effective refractive index of the resonant cavity 2, namely the optical path to change, a current signal flowing through a copper wire can cause the temperature change, and further the resonance frequency of the optical signal in the optical fiber resonant cavity 2 is changed, so that the refractive index and the optical path length of the optical fiber resonant cavity are influenced to change, and therefore current information. The resonant cavity 2 can be replaced by a double-ring resonant cavity, an embedded microcavity or a microcavity with other shapes, as long as the dimension is ensured to be close to that of the double-ring resonant cavity, the light field output by the light source can be transmitted with low loss in the light field, and meanwhile evanescent waves exist on the outer surface of the cavity. The design is carried out according to specific application scenes and actual intensity detection requirements, and only the change of the transmission characteristic under the action of the current signal is ensured.
Claims (10)
1. The double-enhancement current sensing system based on the microfiber junction and the magnetic fluid is characterized in that: the device comprises a broadband light source (1), an optical fiber resonant cavity (2), a magnetic fluid (3), low-refractive-index ultraviolet curing glue (4) and a spectrometer (5);
an optical signal output by the broadband light source (1) is transmitted to an input port of the optical fiber resonant cavity (2) through an optical fiber, an optical field in the optical fiber resonant cavity is transmitted to the spectrometer (5) through the optical fiber after being transmitted for multiple times, and the magnetic fluid (3) is fixed on the outer side surface of the optical fiber resonant cavity (2) through the low-refractive-index ultraviolet curing adhesive (4); a copper wire for conducting direct current is arranged on the outer side of the optical fiber resonant cavity (2), and the optical fiber resonant cavity (2) is formed by knotting microfibers; the change of an external magnetic field through a copper wire with direct current leads to the change of the refractive index of the magnetic fluid (3) and further leads to the change of the effective refractive index of the optical fiber resonant cavity (2), namely the change of the optical path, and the current signal flowing through the copper wire can cause the temperature change, so that the resonance frequency of the optical signal in the optical fiber resonant cavity (2) is changed, thereby influencing the change of the refractive index and the optical path length of the optical fiber resonant cavity, therefore, the transmission spectrum of the cavity measured on the spectrometer (5) contains current information, and the intensity information of the current is demodulated through data processing; the positions of the resonant cavity, the magnetic fluid and the optical fiber resonant cavity are fixed; the refractive index value of the ultraviolet curing glue with low refractive index ensures that the optical field is transmitted in the resonant cavity without loss.
2. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the magnetic fluid contains Fe3O4The colloidal solution of (a) or other magnetic materials capable of changing the refractive index under the action of a magnetic field.
3. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the method for improving the current sensing sensitivity is to cause the wavelength displacement change in the cavity through the heat released by the current flowing through the copper wire, and add the magnetic fluid to increase the sensing precision.
4. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the influence of heat on the parameters of the resonant cavity is controlled by adjusting the magnitude of current flowing through the copper wire.
5. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the resonant cavity is formed by knotting silicon fibers prepared by adopting a flame electric brush technology.
6. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the optical fiber resonant cavity is embedded in the magnetic fluid, or the resonant cavity is adhered to the magnetic fluid.
7. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the resonant cavity is made of silicon microfiber and is in the shape of an annular cavity or a microsphere cavity; the resonant cavity is capable of supporting the transmission of light waves and has evanescent waves at the outer surface of the cavity.
8. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the magnetic fluid is in the shape of a cylinder, a flat plate or a helmet.
9. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the microfiber coupling length is at least 3 millimeters to achieve sufficient van der waals forces to join two microfibers together.
10. The dual augmented current sensing system based on a microfiber junction and a magnetic fluid according to claim 1, wherein: the optical fiber resonant cavity is replaced by a double-ring resonant cavity and an embedded micro-cavity.
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2020
- 2020-04-30 CN CN202010364695.7A patent/CN111579847A/en active Pending
Patent Citations (12)
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| JPH0634669A (en) * | 1992-07-14 | 1994-02-10 | Mazda Motor Corp | Current sensor |
| CN101871790A (en) * | 2010-06-08 | 2010-10-27 | 浙江大学 | Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter |
| CN103207310A (en) * | 2013-03-14 | 2013-07-17 | 天津理工大学 | Blazed fiber bragg grating based current change detection device |
| CN104237607A (en) * | 2014-10-15 | 2014-12-24 | 南京大学 | Dual-path detection type current magnetic field sensor based on micro optical fiber coupler |
| WO2016103502A1 (en) * | 2014-12-26 | 2016-06-30 | 有限会社ワイワイオフィス | Constant-excitation-magnetic-flux-type current sensor |
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Application publication date: 20200825 |