CN106872754B - The linear optics current sensor and detection method realized based on 4 quadrant detector - Google Patents
The linear optics current sensor and detection method realized based on 4 quadrant detector Download PDFInfo
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- CN106872754B CN106872754B CN201710062866.9A CN201710062866A CN106872754B CN 106872754 B CN106872754 B CN 106872754B CN 201710062866 A CN201710062866 A CN 201710062866A CN 106872754 B CN106872754 B CN 106872754B
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- quadrant detector
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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 Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The present invention relates to a kind of linear optics current sensor realized based on 4 quadrant detector and detection methods, including laser source, the polarizer, magneto-optic thin film, beam expander, radial analyzing grating, 4 quadrant detector and the signal processing system being set in turn in same optical path；It further include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the ring concentrator, and magneto-optic thin film is set between the air gap of the ring concentrator.The detection method is detained cruelly: optical signal obtains a hot spot after the polarizer, magneto-optic thin film, beam expander and radial analyzing grating from laser source；After hot spot passes through 4 quadrant detector, electric signal is changed by optical signal, which is acquired by signal processing system, and obtain the size of rotation angle by operation, to obtain current value to be measured in the current carrying conductor to be detected.Device proposed by the present invention and method greatly improve resolution ratio, improve accuracy, reduce costs compared to CCD camera is used.
Description
Technical field
The present invention relates to a kind of linear optics current sensor realized based on 4 quadrant detector and detection methods.
Background technique
Compared to traditional electromagnetic current transducer, optical current mutual inductor have insulation system it is simple, without magnetic saturation,
Anti-electromagnetic interference capability is strong, measures the advantages that bandwidth, is the research hotspot of smart grid primary equipment.Currently, most optics
Mutual inductor realizes current measurement to spot location using line array CCD (Charge Coupled Device) camera, overcomes biography
Unite light-intensity test mode many defects, as range of dynamic measurement is narrow, non-linear, optical power dependence, linear birefringence interference and
Temperature drift etc. improves the practicability of mutual inductor.But there are many deficiencies, examples for the light spot image localization method based on line array CCD
As at high cost, Algorithm Error is big, need by rotate image be converted to displacement images, Measurement Resolution by image converter optical fiber
Quantity and the limitation of CCD camera pixel dimension etc., especially when measuring low current, because lack of resolution cause measurement error compared with
Greatly, it is difficult to meet S grades of requirements.
Summary of the invention
The purpose of the present invention is to provide a kind of linear optics current sensor realized based on 4 quadrant detector and inspections
Survey method, to overcome defect existing in the prior art.
To achieve the above object, the technical scheme is that a kind of linear optics realized based on 4 quadrant detector
Current sensor, including laser source, the polarizer, magneto-optic thin film, beam expander, the radial analyzing light being set in turn in same optical path
Grid, 4 quadrant detector and signal processing system；It further include a ring concentrator for offering air gap, current carrying conductor to be detected passes through
The ring concentrator, the magneto-optic thin film are set between the air gap of the ring concentrator.
Further, a kind of detection side of linear optics current sensor realized based on 4 quadrant detector is also provided
Method, optical signal obtain linearly polarized light after the polarizer from the laser source；The linearly polarized light is thin by the magneto-optic
Film, the plane of polarization of the polarised light generate rotation under the action of the current carrying conductor current field to be detected, form a rotation
Angle；After the linearly polarized light passes through the beam expander, hot spot is amplified；Using obtaining a shape after the radial analyzing grating
The fixed hot spot of shape, hot spot and rotation angle synchronous rotary；After the hot spot of rotation passes through the 4 quadrant detector, turned by optical signal
Become electric signal, which is acquired by the signal processing system, and obtain the size of rotation angle by operation, thus
The current value to be measured into the current carrying conductor to be detected.
In one embodiment of the invention, the size of the rotation angle is current field intensity, light passing length and magneto-optic thin film expense
The linear function of your moral constant.
Outgoing light vector in one embodiment of the invention, after the radial polarisation grating are as follows:
Wherein, A is polarization light amplitude, tφFor the light transmittance of grating, θ0For mangneto rotation angle；
And the intensity distribution function of hot spot are as follows:
In formula, R1, R2 are respectively the inside radius and outer radius of the radial polarisation grating.
In one embodiment of the invention, electric current i and mangneto rotation angle that the 4 quadrant detector detectsPass
System meets:
Wherein, L0For ring concentrator gas length, l0For magneto-optic thin film thickness, V is magneto-optic thin film Verdet constant.
In one embodiment of the invention, the mangneto rotation angle θ0Are as follows:
Wherein, X is the output valve of 4 quadrant detector.
Compared to the prior art, the invention has the following advantages: the present invention utilizes radial polarisation grating by faraday
Angle of rotation is converted to the synchronous rotary of ring-shaped light spot striped, obtains the big of mangneto rotation angle to spot location by 4 quadrant detector
It is small, so that the real-time measurement to electric current is realized, compared to the detection method using image converter and CCD industrial camera, cost
95% is reduced, superiority of effectiveness is obvious；It is not big by CCD camera pixel and since 4 quadrant detector output is analog signal
Small and image converter number of fibers limitation, Measurement Resolution improve nearly 100 times, and accuracy of measurement is increased to from 0.5 grade
0.2S grades.
Detailed description of the invention
Fig. 1 is the structure for the linear optics current sensor realized in one embodiment of the invention based on 4 quadrant detector
Figure.
Fig. 2 is the structural schematic diagram of radial analyzing grating in one embodiment of the invention.
Fig. 3 is the structural schematic diagram of grating in radial analyzing grating in one embodiment of the invention.
Fig. 4 is the structural schematic diagram of 4 quadrant detector in one embodiment of the invention.
Fig. 5 is the ring-shaped light spot pattern surveyed in one embodiment of the invention.
[label declaration]: 1- laser source；The 2- polarizer；3- magneto-optic thin film；4- beam expander；5- radial direction analyzing grating；6- tetra-
Quadrant detector；7- signal processing system.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of linear optics current sensor realized based on 4 quadrant detector, as shown in Figure 1, including
Laser source 1, the polarizer 2, magneto-optic thin film 3, beam expander 4, the radial analyzing grating 5, four-quadrant being set in turn in same optical path
Detector 6 and signal processing system 7；It further include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the collection magnetic
Ring, magneto-optic thin film are set between the air gap of the ring concentrator.
Further, in the present embodiment, ring concentrator air gap is less than 15mm, and Distribution of Magnetic Field is uniform.
Further, in the present embodiment, as shown in FIG. 2 and 3, radial analyzing grating is round, internal diameter 4mm,
Outer diameter is 5mm；Grating grizzly bar is aluminum metal, spacing 50nm.
Further, in the present embodiment, optical signal obtains linearly polarized light by the polarizer 2 from laser source 1, then arrives magneto-optic
On film 3, the plane of polarization of polarised light generates rotation under the action of current carrying conductor current field, and the size of rotation angle is electric current magnetic
The linear function of field intensity, light passing length and magneto-optic thin film Verdet constant, linearly polarized light are put by hot spot after beam expander 4
Greatly, the hot spot fixed using a shape is obtained after radial analyzing grating 5, hot spot and rotation angle synchronous rotary, the light of rotation
Spot is changed into electric signal by optical signal in 4 quadrant detector 6, acquires electric signal using signal processing system 7, and pass through a system
The arcsine and multinomial operation of column can obtain the size of rotation angle, to obtain current value to be measured.
Further, in the present embodiment, by taking the current transformer based on radial analyzing as an example, final light spot image is such as
Shown in Fig. 4.Outgoing light vector after radial polarisation grating are as follows:
In formula, A is polarization light amplitude, tφFor the light transmittance of grating, θ0For mangneto rotation angle.
The then intensity distribution function of hot spot are as follows:
In formula, R1, R2 are respectively the inside radius and outer radius of radial polarisation grating.
As shown in figure 5, obtaining the light energy E on 4 quadrant detector in each region by integral operationA、EB、EC、ED
It is respectively as follows:
The input optical signal on four tunnels forms voltage by processing of circuit, then obtains 4 quadrant detector by following operation
Output valve X are as follows:
Mangneto rotation angle θ then can be obtained0Are as follows:
The electric current i and mangneto rotation angle that 4 quadrant detector detectsRelationship meet:
Wherein, L0For ring concentrator gas length, l0For magneto-optic thin film thickness, V is Verdet constant.
Further, if Fig. 4 is the structural schematic diagram of 4 quadrant detector.As being that linearly polarized light passes through radial inspection in Fig. 5
Hot spot pattern after polarisation grid, light spot image are fixed, and are rotated with size of current to be measured.By radial polarisation aluminum metal
Grating obtains the light spot image of synchronous rotary after demodulating to faraday's magnetic rotation angle, measures light spot image by 4 quadrant detector
Rotation angle, compared to use CCD camera, Measurement Resolution improves nearly 100 times in ± 40 ° of mangneto rotation angles,
Accuracy of measurement has been increased to 0.2S grades from 0.5 grade, and cost reduces 95%.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (5)
1. a kind of linear optics current sensor realized based on 4 quadrant detector, which is characterized in that including being set in turn in
At laser source, the polarizer, magneto-optic thin film, beam expander, radial analyzing grating, 4 quadrant detector and signal in same optical path
Reason system；It further include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the ring concentrator, the magneto-optic thin film setting
Between the air gap of the ring concentrator；
Wherein, optical signal obtains linearly polarized light after the polarizer from the laser source；Described in the linearly polarized light passes through
Magneto-optic thin film, the plane of polarization of the polarised light generate rotation under the action of the current carrying conductor current field to be detected, are formed
One rotation angle；After the linearly polarized light passes through the beam expander, hot spot is amplified；Using being obtained after the radial analyzing grating
The fixed hot spot of one shape, hot spot and rotation angle synchronous rotary；After the hot spot of rotation passes through the 4 quadrant detector, by light
Signal is changed into electric signal, acquires the electric signal by the signal processing system, and the size of rotation angle is obtained by operation,
To obtain current value to be measured in the current carrying conductor to be detected；
Wherein, the outgoing light vector after the radial polarisation grating are as follows:
Wherein, A is polarization light amplitude, tφFor the light transmittance of grating, θ0For mangneto rotation angle；
And the intensity distribution function of hot spot are as follows:
In formula, R1, R2 are respectively the inside radius and outer radius of the radial polarisation grating；θ indicates grating azimuth；
Wherein, by integral operation, the light energy E on 4 quadrant detector in each region is obtainedA、EB、EC、EDIt is respectively as follows:
The input optical signal on four tunnels forms voltage by processing of circuit, then obtains the defeated of 4 quadrant detector by following operation
Value X out are as follows:
The mangneto rotation angle θ0Are as follows:
Wherein, X is the output valve of 4 quadrant detector.
2. the detection method of the linear optics current sensor according to claim 1 realized based on 4 quadrant detector,
It is characterized in that, the ring concentrator air gap is less than 15mm, and Distribution of Magnetic Field is uniform.
3. the detection method of the linear optics current sensor according to claim 1 realized based on 4 quadrant detector,
It is characterized in that, the radial direction analyzing grating is circle, internal diameter 4mm, outer diameter 5mm；Grating grizzly bar is aluminum metal, and spacing is
50nm。
4. the detection method of the linear optics current sensor according to claim 1 realized based on 4 quadrant detector,
It is characterized in that, the size of the rotation angle is the linear of current field intensity, light passing length and magneto-optic thin film Verdet constant
Function.
5. the detection method of the linear optics current sensor according to claim 1 realized based on 4 quadrant detector,
It is characterized in that, electric current i and mangneto rotation angle θ that the 4 quadrant detector detects0Relationship meet:
Wherein, L0For ring concentrator gas length, l0For magneto-optic thin film thickness, V is magneto-optic thin film Verdet constant.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030903A (en) * | 2018-07-13 | 2018-12-18 | 福州大学 | A kind of optical voltage transformer realized based on crystal birefringence |
| CN108917944A (en) * | 2018-07-13 | 2018-11-30 | 福州大学 | A kind of optical voltage transformer realized based on Newton's ring metal grating |
| CN109030905A (en) * | 2018-07-16 | 2018-12-18 | 福州大学 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
| CN108872681B (en) * | 2018-07-16 | 2020-11-10 | 福州大学 | Optical current transformer realized based on strip-shaped radial polarization grating |
| CN109521243A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on circular cone Brewster prism |
| CN109521246A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on Newton's ring metal grating |
| CN109521244A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on S wave plate |
| CN109521245A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on combination half-wave plate |
| CN113466326A (en) * | 2021-06-21 | 2021-10-01 | 电子科技大学 | Magnetic field visual sensing module based on backlight transmission type structure |
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| US5717201A (en) * | 1996-04-18 | 1998-02-10 | National Science Council | Double four-quadrant angle-position detector |
| CN1731085A (en) * | 2005-08-12 | 2006-02-08 | 中国科学院上海光学精密机械研究所 | The device of measuring laser beam collimation |
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