CN101846703A - Digital optical fiber current sensor - Google Patents
Digital optical fiber current sensor Download PDFInfo
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- CN101846703A CN101846703A CN200910157931A CN200910157931A CN101846703A CN 101846703 A CN101846703 A CN 101846703A CN 200910157931 A CN200910157931 A CN 200910157931A CN 200910157931 A CN200910157931 A CN 200910157931A CN 101846703 A CN101846703 A CN 101846703A
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Abstract
The invention relates to a digital optical fiber current sensor. The fundamental principle is that: based on a Faraday magnetic rotation effect, a polarization plane of linearly polarized light passing through a magneto-optical crystal can rotate under the action of the magnetic field of the current and the rotary angle is in direct proportion to the magnitude of the current. The polarization directions of an annular analyzer are distributed uniformly in a radial direction in a 180-degree annular region; the linearly polarized light consistent with a certain polarization direction on the annular analyzer can pass through the analyzer; the linearly polarized light vertical to the polarization direction cannot pass through the analyzer; and therefore, the intensity of the polarized light passing through the analyzer in a certain 90-degree region on the annular analyzer is decreased gradually from maximum to minimum, a light intensity distribution image is formed, the maximum or minimum light intensity position can be found through the analyzing process of a CMOS/CCD image sensor, the rotary angle of the polarized light is determined, and the real-time digital quantity of a current signal is acquired. A current measuring method is linear, so that the method is suitable for the measurement of alternating current and also can be suitable for the measurement of direct current.
Description
Technical field
The present invention relates to a kind of digital optical fiber current sensor, ultimate principle is based on faraday's magnetic rotation effect rotates the linear polarization polarization surface under the effect of current field, use that radially analyzer and digital image processing method are measured the angle of plane of polarization rotation and obtained the digital current signal.Be applicable to the alterating and direct current flow measurement of electric system.
Background technology
The current transformer or the current sensor that use in the electric system at present are based on the electromagnetic type of Faradic electricity magnetic induction principle and the simulation magneto-optic formula and the electronic type of utilizing Rogowski coil to realize of magnetic rotation effect.
The existing 60 years of development history of simulation magneto-optical current sensor, its principle is based on the linear polarization polarization surface and rotates under the effect of current field, and the angle of rotation is directly proportional with the size of electric current, and scale-up factor is a Verdet constant.Utilize analyzer to detect the light intensity that causes because of the plane of polarization rotation and change, obtain analog current signal through opto-electronic conversion.Its advantage is to utilize the transmission of light signal to realize complete electrical isolation between the high electronegative potential; Its shortcoming is that the method for luminous intensity measurement is non-linear, and the scope of measurement and accuracy are restricted.In addition, electromagnetic type, simulation magneto-optic formula and electronic current sensor are to be the progress of disease of one-off pattern analog signal the secondary simulating signal, need just can obtain digital signal by means of analog to digital conversion circuit, in electric system today to digital development, more than several sensors in the application of digital transformer substation, significant limitation is arranged.
Summary of the invention
The objective of the invention is to propose a kind of based on faraday's magnetic rotation effect and the current measuring method that utilizes radially analyzer and digital image processing method to realize, as shown in Figure 1.
Method of the present invention is that laser signal [1] is coupled to Transmission Fibers [3] and is sent to noble potential from electronegative potential through coupling mechanism [2], behind collimating apparatus [4] collimation, obtain linearly polarized light through the polarizer [5] again, and enter the magneto-optical crystal [6] that places current field, the direction that the magnetic field that electric current produces and linearly polarized light are advanced is consistent and the linear polarization polarization surface is rotated, the angle of rotation is directly proportional with the size of electric current, and scale-up factor is a Verdet constant.Be coupled to Transmission Fibers [8] and be sent to electronegative potential through coupling mechanism [7] from the linearly polarized light of magneto-optical crystal [6] outgoing from noble potential, behind collimating apparatus [9] collimation and beam expander [10] expansion bundle, enter annular analyzer [11] as shown in Figure 2, the characteristics of annular analyzer are that its direction of shaking thoroughly radially evenly distributes in 180 ° annular region, can see through analyzer with the linearly polarized light that a certain direction of shaking is consistent on the annular analyzer, the linearly polarized light vertical with this direction of shaking thoroughly can not see through analyzer, thereby the intensity of polarization light through analyzer is decremented to minimum by maximum in a certain 90 ° zone on annular analyzer, form a light distribution image, by CMOS/CCD imageing sensor [12] the polarized light intensity distributed image is carried out analyzing and processing and finds out maximum or the position of minimum intensity of light, just determine the size of the linearly polarized light anglec of rotation, thereby obtained the real-time digital amount of current signal.
The current measuring method that the present invention proposes is linear, both has been applicable to the measurement of alternating current, also is applicable to the measurement of DC current.
Description of drawings
Accompanying drawing 1 is a schematic diagram of the present invention.
Accompanying drawing 2 is annular analyzer synoptic diagram of the present invention.
Accompanying drawing 3 is the specific embodiment of the present invention.
Wherein, [1] is LASER Light Source, and [2] are coupling mechanisms, [3] be Transmission Fibers, [4] are collimating apparatuss, and [5] are the polarizers, [6] be magneto-optical crystal, [7] are coupling mechanisms, and [8] are Transmission Fibers, [9] be collimating apparatus, [10] are beam expanders, and [11] are annular analyzers, [12] be the CMOS/CCD imageing sensor, [13] be insulator, [14] are high-voltage conducting wires, and [15] are the branch flow solenoids.
Embodiment
Embodiment as shown in Figure 3, laser signal [1] is coupled to light signal Transmission Fibers [3] and is sent to noble potential from electronegative potential through coupling mechanism [2], obtain linearly polarized light and enter magneto-optical crystal [6] through collimating apparatus [4] collimation and the polarizer [5], divide flow solenoid [15] to shunt the main traverse line electric current, it is consistent and the linear polarization polarization surface is rotated to flow through direction that magnetic field that the electric current of [15] produces and linearly polarized light advance, be coupled to Transmission Fibers [8] from the linearly polarized light of [6] outgoing through coupling mechanism [7] and be sent to electronegative potential, behind collimating apparatus [9] collimation and beam expander [10] expansion bundle, enter annular analyzer [11], the light distribution image that sees through the polarized light formation of [11] obtains the position of maximum or minimum intensity of light through CMOS/CCD image sensing [12] analyzing and processing, just determine the size of the linearly polarized light anglec of rotation, obtained the real-time digital amount of current signal.LASER Light Source [1], coupling mechanism [2] and [7], Transmission Fibers [3] and [8], collimating apparatus [4] and [9],, the polarizer [5], magneto-optical crystal [6], beam expander [10], annular analyzer [11], CMOS/CCD imageing sensor [12], branch flow solenoid [15] all place insulator [13], and high-voltage conducting wires [14] is at the top of insulator [13].
Claims (5)
1. digital optical fiber current sensor, it is characterized in that: the linear polarization polarization surface that sees through magneto-optical crystal rotates under the effect of current field, the angle of rotation is directly proportional with the size of electric current, annular analyzer detects through the linearly polarized light of magneto-optical crystal and forms a light distribution image, obtains the size of the linearly polarized light anglec of rotation and obtains the real-time digital amount of current signal through CMOS/CCD imageing sensor analyzing and processing.
2. digital optical fiber current sensor according to claim 1, it is characterized in that: the direction of shaking thoroughly of annular analyzer radially evenly distributes in 180 ° annular region, see through analyzer with the linear polarization luminous energy that a certain direction of shaking is consistent on the annular analyzer, the linearly polarized light vertical with this direction of shaking thoroughly can not see through analyzer, thereby the intensity of polarization light through analyzer is decremented to minimum by maximum in a certain 90 ° zone on annular analyzer, forms a light distribution image.
3. digital optical fiber current sensor according to claim 1 and 2 is characterized in that: application transport optical fiber transmits light signal between noble potential and electronegative potential.
4. according to claim 1 or 2 or 3 described digital optical fiber current sensors, it is characterized in that: use the CMOS/CCD imageing sensor polarized light intensity distributed image is carried out analyzing and processing and finds out maximum or the position of minimum intensity of light, to determine the size of the polarized light anglec of rotation, obtain the real-time digital amount of current signal.
5. according to claim 1 or 2 or 3 or 4 described digital optical fiber current sensors, it is characterized in that: both be applicable to the measurement of alternating current, also be applicable to the measurement of DC current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910157931.1A CN101846703B (en) | 2009-03-23 | 2009-07-17 | Digital optical fiber current sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910119096.2 | 2009-03-23 | ||
| CN200910119096 | 2009-03-23 | ||
| CN200910157931.1A CN101846703B (en) | 2009-03-23 | 2009-07-17 | Digital optical fiber current sensor |
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| CN101846703A true CN101846703A (en) | 2010-09-29 |
| CN101846703B CN101846703B (en) | 2014-10-15 |
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| CN200910157931.1A Expired - Fee Related CN101846703B (en) | 2009-03-23 | 2009-07-17 | Digital optical fiber current sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253272A (en) * | 2011-04-29 | 2011-11-23 | 南京邮电大学 | Current measurement and protective sensor for high-voltage alternating current |
| CN102565509A (en) * | 2011-12-16 | 2012-07-11 | 西安交通大学 | Multi-light-path reflecting optical fiber current sensor |
| CN102590585A (en) * | 2012-02-20 | 2012-07-18 | 上海理工大学 | Measuring device for large current of power grid |
| CN102590584A (en) * | 2012-02-20 | 2012-07-18 | 上海理工大学 | Large current detecting device based on optical means |
| CN102636682A (en) * | 2012-05-09 | 2012-08-15 | 上海理工大学 | Device and method for measuring large current by optical fiber |
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
| CN117491924A (en) * | 2023-12-29 | 2024-02-02 | 致真精密仪器(青岛)有限公司 | Magneto-optical effect-based hysteresis loop detection method, magneto-optical effect-based hysteresis loop detection equipment and magneto-optical effect-based hysteresis loop detection medium |
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| JP2000292459A (en) * | 1999-04-09 | 2000-10-20 | Takaoka Electric Mfg Co Ltd | Optical current transformer |
| CN2403033Y (en) * | 1999-12-02 | 2000-10-25 | 哈尔滨工程大学 | Optical current sensor |
| CN1580789A (en) * | 2004-05-15 | 2005-02-16 | 华中科技大学 | Photoelectric direct current sensor |
| CN101354409A (en) * | 2008-09-08 | 2009-01-28 | 重庆大学 | Optical current sensor |
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| JP2000292459A (en) * | 1999-04-09 | 2000-10-20 | Takaoka Electric Mfg Co Ltd | Optical current transformer |
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| CN1580789A (en) * | 2004-05-15 | 2005-02-16 | 华中科技大学 | Photoelectric direct current sensor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253272A (en) * | 2011-04-29 | 2011-11-23 | 南京邮电大学 | Current measurement and protective sensor for high-voltage alternating current |
| CN102253272B (en) * | 2011-04-29 | 2013-07-03 | 南京邮电大学 | Current measurement and protective sensor for high-voltage alternating current |
| CN102565509A (en) * | 2011-12-16 | 2012-07-11 | 西安交通大学 | Multi-light-path reflecting optical fiber current sensor |
| CN102565509B (en) * | 2011-12-16 | 2014-09-03 | 西安交通大学 | Multi-light-path reflecting optical fiber current sensor |
| CN102590585A (en) * | 2012-02-20 | 2012-07-18 | 上海理工大学 | Measuring device for large current of power grid |
| CN102590584A (en) * | 2012-02-20 | 2012-07-18 | 上海理工大学 | Large current detecting device based on optical means |
| CN102636682A (en) * | 2012-05-09 | 2012-08-15 | 上海理工大学 | Device and method for measuring large current by optical fiber |
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
| CN117491924A (en) * | 2023-12-29 | 2024-02-02 | 致真精密仪器(青岛)有限公司 | Magneto-optical effect-based hysteresis loop detection method, magneto-optical effect-based hysteresis loop detection equipment and magneto-optical effect-based hysteresis loop detection medium |
| CN117491924B (en) * | 2023-12-29 | 2024-03-19 | 致真精密仪器(青岛)有限公司 | Magneto-optical effect-based hysteresis loop detection method, magneto-optical effect-based hysteresis loop detection equipment and magneto-optical effect-based hysteresis loop detection medium |
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| CN101846703B (en) | 2014-10-15 |
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