CN107643438A - Optical current sensor and its current measuring method based on Faraday magnetooptical effect - Google Patents

Optical current sensor and its current measuring method based on Faraday magnetooptical effect Download PDF

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CN107643438A
CN107643438A CN201710828444.8A CN201710828444A CN107643438A CN 107643438 A CN107643438 A CN 107643438A CN 201710828444 A CN201710828444 A CN 201710828444A CN 107643438 A CN107643438 A CN 107643438A
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optical
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杨鸣
司马文霞
孙魄韬
袁涛
郑荣锋
张涵
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Chongqing University
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Chongqing University
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Abstract

The invention discloses a kind of optical current sensor based on Faraday magnetooptical effect, including：Laser generator, for producing the polarization laser of setting wavelength；Integration probe, including magnet-optical medium, the both ends of the magnet-optical medium are respectively equipped with the polarizer and analyzer, and the polarizer and analyzer distinguish insulation-encapsulated at the both ends of the magnet-optical medium；Photodetector, for converting optical signals to electric signal；Data analysis and processing unit, noise is filtered out by the way of software filtering is combined using hardware filtering, obtains good response effect；Between the laser generator and the polarizer and optic fibre light path is respectively adopted between the photodetector and the analyzer to be connected.The invention also discloses a kind of current measuring method of the optical current sensor based on Faraday magnetooptical effect.

Description

Optical current sensor and its current measuring method based on Faraday magnetooptical effect
Technical field
It is specific to be based on faraday for one kind the invention belongs to contactless optical current sensor field of measuring technique The optical current sensor and its current measuring method of magneto-optic effect.
Background technology
With the development of power system, requirement of the system to safety and stability also more and more higher.Current sensor conduct Carried out in power system the visual plant of electric energy metrical and relay protection, its degree of accuracy and reliability and the safety of power system, It is reliable closely related with economical operation.Traditional electromagnetic type current sensor there is shortcomings, such as：Insulation system is answered Miscellaneous, volume is big, is also easy to produce magnetic saturation ferromagnetic resonance, magnetic hysteresis etc. be present, is increasingly difficult to adapt to the demand of power system development.Although Traditional electromagnetic type current sensor is also constantly improving, but this can not fundamentally change the shortcomings that it is present.With biography The electromagnetic type current sensor of system is compared, and optical current sensor all has advantage in the following aspects, such as:Non iron-core, High and low voltage isolation, small volume, frequency response is wide, is adapted to requirement of digital transformer substation etc..Therefore, people turn to sight new The research of current sensor, optical current sensor produce in this context.
The content of the invention
In view of this, it is an object of the invention to provide a kind of optical current sensor based on Faraday magnetooptical effect and Its current measuring method, it disclosure satisfy that the requirement of current measurement.
To reach above-mentioned purpose, the present invention provides following technical scheme：
Present invention firstly provides a kind of optical current sensor based on Faraday magnetooptical effect, including：
Laser generator, for producing the polarization laser of setting wavelength；
Integration probe, including magnet-optical medium, the both ends of the magnet-optical medium are respectively equipped with the polarizer and analyzer, described Inclined device and analyzer distinguish insulation-encapsulated at the both ends of the magnet-optical medium；
Photodetector, for converting optical signals to electric signal；
Data analysis and processing unit, noise is filtered out by the way of software filtering is combined using hardware filtering, obtained good Good response effect；
Distinguish between the laser generator and the polarizer and between the photodetector and the analyzer It is connected using optic fibre light path.
Further, the magnet-optical medium uses magneto-optic glass.
Further, the magneto-optic glass is the cylinder or electric for measuring long straight conductor for measuring helix tube line current The cuboid of stream.
The invention also provides a kind of electric current of the optical current sensor based on Faraday magnetooptical effect as described above Measuring method, when making at 45 ° between the polarizer and the analyzer or 135 ° of angles, light intensity is inputted using laser generator I1, the output intensity I after the polarizer, magneto-optic glass, analyzer2For：
Wherein, β is Faraday rotation angle, because β is minimum, can be approximately β by sin β, then have：
Wherein, β=VBL
In formula, V is Fil moral (Verder) constant of magneto-optic memory technique, and unit is rad/ (Tm)；B is magnetic caused by electric current ；L is the thickness of the light path of polarized light transmission magnet-optical medium, i.e. magnet-optical medium；
Then：
When tested wire is long straight conductor, the relation between final output voltage and tested electric current is：
Wherein,Then,
Wherein, I is the tested electric current in long straight conductor；R is distance of the measurement point apart from long straight conductor；μ0For magnet-optical medium Magnetic conductivity；
Work as I1When with r being definite value, k2And k3For constant；
When it is tested be directed to spiral pipeline when, the relation between final output voltage and tested electric current is：
Wherein, B=n μ0I, then,
Wherein, I is the tested electric current in spiral pipeline, and n is the spiral pipeline unit length number of turn, μ0For the magnetic of magnet-optical medium Conductance；Work as I1For definite value when, then, and k2And k4It is constant.
The beneficial effects of the present invention are：
The present invention based on the optical current sensor of Faraday magnetooptical effect relative to existing current sensor have with Lower advantage：
1) securely and reliably, the insulating properties of line facility are not had an impact；
2) high sensitivity, range are big；
3) measurable polytype electric current, including impact when DC current, alternating current and electric network fault are electric greatly Stream；
4) Integration Design, it is easy installation and reliable；
5) frequency response is wide, and transient performance is good；Small volume, non iron-core, high and low voltage isolation, it is adapted to digital transformer substation will Ask.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out Explanation：
Fig. 1 is the optical current sensor structural representation of the invention based on Faraday magnetooptical effect；
Fig. 2 is the structural representation of the integration probe of the present embodiment 1；
Fig. 3 is the structure of the integration probe of the optical current sensor embodiment 2 of the invention based on Faraday magnetooptical effect Schematic diagram；
Fig. 4 is that use state when measuring current value in long straight conductor using the optical current sensor of the present embodiment 2 is joined Examine figure.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
As depicted in figs. 1 and 2, it is the knot of the optical current sensor embodiment 1 of the invention based on Faraday magnetooptical effect Structure schematic diagram.Optical current sensor of the present embodiment based on Faraday magnetooptical effect, including：
Laser generator 1, for producing the polarization laser of setting wavelength, the laser generator 1 of the present embodiment produces wavelength For 632.8nm polarization laser, at that wavelength, the Verdet constant of selected magneto-optic glass is maximum；
Integration probe 8, including magnet-optical medium 2, the both ends of magnet-optical medium 2 are respectively equipped with the polarizer 3 and analyzer 4, are polarized Device 3 and analyzer 4 distinguish insulation-encapsulated at the both ends of magnet-optical medium 2；In addition, integration probe also includes fixed support and encapsulation Deng；The magnet-optical medium 2 of the present embodiment uses magneto-optic glass, and magneto-optic glass is the cylinder for measuring helix tube line current；
Photodetector 5, for converting optical signals to electric signal；
Data analysis and processing unit 6, filter out noise by the way of software filtering is combined using hardware filtering, obtain good Good response effect.
Adopted respectively between the laser generator 1 and the polarizer 3 of the present embodiment and between photodetector 5 and analyzer 4 It is connected with optic fibre light path 7.
The current measuring method of optical current sensor of the present embodiment based on Faraday magnetooptical effect is to make the polarizer 3 At 45 ° or 135 ° of angles between analyzer 4, light intensity I is inputted using laser generator1, by the polarizer, magneto-optic glass, analyzing Output intensity I after device2For：
Wherein, β is Faraday rotation angle, because β is minimum, can be approximately β by sin β, then have：
Wherein, β=VBL
In formula, V is Fil moral (Verder) constant of magneto-optic memory technique, and unit is rad/ (Tm)；B is magnetic caused by electric current ；L is the thickness of the light path of polarized light transmission magnet-optical medium 2, i.e. magnet-optical medium 2；
Then：
Tested wire is spiral pipeline, and the relation between final output voltage and tested electric current is：
Wherein, B=n μ0I, then,
Wherein, I is the tested electric current in spiral pipeline, and n is the spiral pipeline unit length number of turn, μ0For the magnetic of magnet-optical medium Conductance；Work as I1For definite value when, then, and k2And k4It is constant.
Before measurement, first in the installation place field survey of optical current sensor of the present embodiment based on Faraday magnetooptical effect The current value of multigroup determination, the multigroup corresponding magnitude of voltage of Data Analysis Services device output, is calculated the related of sensor and joins Number k2 and k4, then then can be according to formula and the magnitude of voltage of output, and inverse obtains the exact value of tested electric current.
Embodiment 2
As shown in figure 3, the integration probe for the optical current sensor embodiment 2 based on Faraday magnetooptical effect that is the present invention Structural representation.Optical current sensor of the present embodiment based on Faraday magnetooptical effect, including：
Laser generator 1, for producing the polarization laser of setting wavelength, the laser generator 1 of the present embodiment produces wavelength For 632.8nm polarization laser, at that wavelength, the Verdet constant of selected magneto-optic glass is maximum；
Integration probe, including magnet-optical medium 2, the both ends of magnet-optical medium 2 are respectively equipped with the polarizer 3 and analyzer 4, the polarizer 3 and analyzer 4 distinguish insulation-encapsulated at the both ends of magnet-optical medium 2；In addition, integration probe also includes fixed support and encapsulation etc.； The magnet-optical medium 2 of the present embodiment uses magneto-optic glass, and magneto-optic glass is the cuboid of measurement long straight conductor electric current；
Photodetector 5, for converting optical signals to electric signal；
Data analysis and processing unit 6, filter out noise by the way of software filtering is combined using hardware filtering, obtain good Good response effect.
Adopted respectively between the laser generator 1 and the polarizer 3 of the present embodiment and between photodetector 5 and analyzer 4 It is connected with optic fibre light path 7.
The current measuring method of optical current sensor of the present embodiment based on Faraday magnetooptical effect is to make the polarizer 3 At 45 ° or 135 ° of angles between analyzer 4, light intensity I is inputted using laser generator1, by the polarizer, magneto-optic glass, analyzing Output intensity I after device2For：
Wherein, β is Faraday rotation angle, because β is minimum, can be approximately β by sin β, then have：
Wherein, β=VBL
In formula, V is Fil moral (Verder) constant of magneto-optic memory technique, and unit is rad/ (Tm)；B is magnetic caused by electric current ；L is the thickness of the light path of polarized light transmission magnet-optical medium 2, i.e. magnet-optical medium 2；
Then：
Tested wire is long straight conductor, and the relation between final output voltage and tested electric current is：
Wherein,Then,
Wherein, I is the tested electric current in long straight conductor；R is distance of the measurement point apart from long straight conductor；μ0For magnet-optical medium Magnetic conductivity；
Work as I1When with r being definite value, k2And k3For constant；
Before measurement, it is tested long straight that optical current sensor of the present embodiment based on Faraday magnetooptical effect is positioned over distance The nearer opening position of wire, obtains higher sensitivity；The installation of integration probe must be parallel with tested wire, if measurement three-phase A phase in wire, can set two or more integration probes, finally solve solid conductor using the method for mathematics decoupling Size of current and waveform.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention Enclose not limited to this.The equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention Protection domain within.Protection scope of the present invention is defined by claims.

Claims (4)

  1. A kind of 1. optical current sensor based on Faraday magnetooptical effect, it is characterised in that：Including：
    Laser generator, for producing the polarization laser of setting wavelength；
    Integration probe, including magnet-optical medium, the both ends of the magnet-optical medium are respectively equipped with the polarizer and analyzer, the polarizer Insulation-encapsulated is distinguished at the both ends of the magnet-optical medium with analyzer；
    Photodetector, for converting optical signals to electric signal；
    Data analysis and processing unit, noise is filtered out by the way of software filtering is combined using hardware filtering, obtained good Respond effect；
    It is respectively adopted between the laser generator and the polarizer and between the photodetector and the analyzer Optic fibre light path is connected.
  2. 2. the optical current sensor according to claim 1 based on Faraday magnetooptical effect, it is characterised in that：The magnetic Optical medium uses magneto-optic glass.
  3. 3. the optical current sensor according to claim 2 based on Faraday magnetooptical effect, it is characterised in that：The magnetic Light glass is the cylinder for measuring helix tube line current or the cuboid for measuring long straight conductor electric current.
  4. 4. a kind of electric current of optical current sensor based on Faraday magnetooptical effect as described in claim any one of 1-3 is surveyed Amount method, it is characterised in that：When making at 45 ° between the polarizer and the analyzer or 135 ° of angles, laser generator is utilized Input light intensity I1, the output intensity I after the polarizer, magneto-optic glass, analyzer2For：
    <mrow> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>&amp;PlusMinus;</mo> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mn>2</mn> <mi>&amp;beta;</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein, β is Faraday rotation angle, because β is minimum, can be approximately β by sin β, then have：
    <mrow> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>&amp;PlusMinus;</mo> <mn>2</mn> <mi>&amp;beta;</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein, β=VBL
    In formula, V is Fil moral (Verder) constant of magneto-optic memory technique, and unit is rad/ (Tm)；B is magnetic field caused by electric current；L It is the thickness of the light path of polarized light transmission magnet-optical medium, i.e. magnet-optical medium；
    Then：
    <mrow> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>&amp;PlusMinus;</mo> <mn>2</mn> <mi>V</mi> <mi>B</mi> <mi>L</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    When tested wire is long straight conductor, the relation between final output voltage and tested electric current is：
    <mrow> <mi>U</mi> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mi>V</mi> <mi>B</mi> <mi>L</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein,Then,
    <mrow> <mi>U</mi> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <mfrac> <mrow> <msub> <mi>V&amp;mu;</mi> <mn>0</mn> </msub> <mi>I</mi> <mi>L</mi> </mrow> <mrow> <mi>&amp;pi;</mi> <mi>r</mi> </mrow> </mfrac> </mrow> <mn>2</mn> </mfrac> <mo>=</mo> <msub> <mi>k</mi> <mn>2</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <msub> <mi>k</mi> <mn>3</mn> </msub> <mo>&amp;CenterDot;</mo> <mi>I</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein, I is the tested electric current in long straight conductor；R is distance of the measurement point apart from long straight conductor；μ0For the magnetic of magnet-optical medium Conductance；
    Work as I1When with r being definite value, k2And k3For constant；
    When it is tested be directed to spiral pipeline when, the relation between final output voltage and tested electric current is：
    <mrow> <mi>U</mi> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mi>V</mi> <mi>B</mi> <mi>L</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein, B=n μ0I, then,
    <mrow> <mi>U</mi> <mo>=</mo> <msub> <mi>k</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <mn>2</mn> <msub> <mi>Vn&amp;mu;</mi> <mn>0</mn> </msub> <mi>I</mi> <mi>L</mi> </mrow> <mn>2</mn> </mfrac> <mo>=</mo> <msub> <mi>k</mi> <mn>2</mn> </msub> <mo>&amp;CenterDot;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <msub> <mi>k</mi> <mn>4</mn> </msub> <mo>&amp;CenterDot;</mo> <mi>I</mi> </mrow> <mn>2</mn> </mfrac> </mrow>
    Wherein, I is the tested electric current in spiral pipeline, and n is the spiral pipeline unit length number of turn, μ0For the magnetic conductivity of magnet-optical medium； Work as I1For definite value when, then, and k2And k4It is constant.
CN201710828444.8A 2017-09-14 2017-09-14 Optical current sensor and its current measuring method based on Faraday magnetooptical effect Pending CN107643438A (en)

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CN109142840A (en) * 2018-09-18 2019-01-04 江门市新会区炎泰电子有限公司 A kind of current measuring method and its all -fiber leakage current protector based on dual wavelength
CN110045169A (en) * 2019-04-29 2019-07-23 上海大学 A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade
CN110726862A (en) * 2019-10-24 2020-01-24 贵州电网有限责任公司 Integrated optical sensor probe for measuring broadband high-amplitude current
CN110726863A (en) * 2019-10-24 2020-01-24 贵州电网有限责任公司 Double-probe non-contact current measuring device and method for power transmission line
CN110794353A (en) * 2019-11-05 2020-02-14 海南电网有限责任公司电力科学研究院 Method for simulating broadband large current and broadband large current frequency sweep test system
CN110824227A (en) * 2019-10-24 2020-02-21 国网重庆市电力公司江津供电分公司 Novel 10kV overhead line zero-sequence current measurement system and method and performance test platform
CN111323635A (en) * 2020-02-26 2020-06-23 贵州江源电力建设有限公司 Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode
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CN111721990A (en) * 2020-06-01 2020-09-29 贵州江源电力建设有限公司 Miniaturized optical fiber current sensor and information processing system
CN111721992A (en) * 2020-06-19 2020-09-29 贵州江源电力建设有限公司 Optical fiber sensing system for measuring current intensity of three-phase high-voltage conductor
CN111751596A (en) * 2020-06-19 2020-10-09 贵州江源电力建设有限公司 Distributed high-voltage transmission line current detection system
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CN109142840B (en) * 2018-09-18 2023-07-25 江门市新会区炎泰电子有限公司 Current measurement method and all-fiber leakage current protector thereof
CN109142840A (en) * 2018-09-18 2019-01-04 江门市新会区炎泰电子有限公司 A kind of current measuring method and its all -fiber leakage current protector based on dual wavelength
CN110045169A (en) * 2019-04-29 2019-07-23 上海大学 A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade
CN110726862A (en) * 2019-10-24 2020-01-24 贵州电网有限责任公司 Integrated optical sensor probe for measuring broadband high-amplitude current
CN110726863A (en) * 2019-10-24 2020-01-24 贵州电网有限责任公司 Double-probe non-contact current measuring device and method for power transmission line
CN110824227A (en) * 2019-10-24 2020-02-21 国网重庆市电力公司江津供电分公司 Novel 10kV overhead line zero-sequence current measurement system and method and performance test platform
CN110794353A (en) * 2019-11-05 2020-02-14 海南电网有限责任公司电力科学研究院 Method for simulating broadband large current and broadband large current frequency sweep test system
CN111323635A (en) * 2020-02-26 2020-06-23 贵州江源电力建设有限公司 Optical fiber sensing system and method for measuring current intensity of high-voltage conductor in non-contact mode
CN111721990A (en) * 2020-06-01 2020-09-29 贵州江源电力建设有限公司 Miniaturized optical fiber current sensor and information processing system
CN111650446A (en) * 2020-06-05 2020-09-11 南方电网数字电网研究院有限公司 Power parameter measuring method, system, device, computer equipment and storage medium
CN111721993A (en) * 2020-06-19 2020-09-29 贵州江源电力建设有限公司 High-sensitivity miniaturized current detection system
CN111751596A (en) * 2020-06-19 2020-10-09 贵州江源电力建设有限公司 Distributed high-voltage transmission line current detection system
CN111721992B (en) * 2020-06-19 2022-09-06 贵州江源电力建设有限公司 Optical fiber sensing system for measuring current intensity of three-phase high-voltage conductor
CN111721992A (en) * 2020-06-19 2020-09-29 贵州江源电力建设有限公司 Optical fiber sensing system for measuring current intensity of three-phase high-voltage conductor
CN116087819A (en) * 2023-01-05 2023-05-09 灵宝宝鑫电子科技有限公司 Power supply current monitoring device for foil producing machine
CN116087819B (en) * 2023-01-05 2023-09-15 灵宝宝鑫电子科技有限公司 Power supply current monitoring device for foil producing machine

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Application publication date: 20180130