CN106872754A - 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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- CN106872754A CN106872754A CN201710062866.9A CN201710062866A CN106872754A CN 106872754 A CN106872754 A CN 106872754A CN 201710062866 A CN201710062866 A CN 201710062866A CN 106872754 A CN106872754 A CN 106872754A
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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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- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention relates to a kind of linear optics current sensor realized based on 4 quadrant detector and detection method, including it is set in turn in lasing light emitter in same light path, the polarizer, magneto-optic thin film, beam expander, radial direction analyzing grating, 4 quadrant detector and signal processing system；Also include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the ring concentrator, magneto-optic thin film to be arranged between the air gap of the ring concentrator.The detection method is detained cruelly：Optical signal is from lasing light emitter by obtaining a hot spot after the polarizer, magneto-optic thin film, beam expander and radial direction analyzing grating；Hot spot gathers the electric signal by after 4 quadrant detector, electric signal being changed into by optical signal by signal processing system, and the size of the anglec of rotation is drawn by computing, so as to obtain current value to be measured in the current carrying conductor to be detected.Device proposed by the present invention and method, compared to CCD camera is used, drastically increase resolution ratio, improve the degree of accuracy, reduce cost.
Description
Technical field
The present invention relates to a kind of linear optics current sensor realized based on 4 quadrant detector and detection method.
Background technology
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, measurement bandwidth the advantages of, be the study hotspot of intelligent grid primary equipment.At present, most optics
Transformer realizes current measurement using line array CCD (Charge Coupled Device) camera to spot location, overcomes biography
Many defects of light-intensity test pattern of uniting, such as range of dynamic measurement is narrow, non-linear, the interference of luminous power dependence, linear birefringence and
Temperature drift etc., improves the practicality of transformer.But, there is many deficiencies, example in the light spot image localization method based on line array CCD
Such as high cost, Algorithm Error is big, need that image will be rotated and be converted to the optical fiber of displacement images, Measurement Resolution by image converter
Limitation of quantity and CCD camera pixel dimension etc., especially measure low current when, because lack of resolution cause measurement error compared with
Greatly, it is difficult to meet S grades of requirement.
The content of the invention
It is an object of the invention to provide a kind of linear optics current sensor realized based on 4 quadrant detector and inspection
Survey method, to overcome defect present in 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 it is set in turn in lasing light emitter, the polarizer, magneto-optic thin film, beam expander, radial direction analyzing light in same light path
Grid, 4 quadrant detector and signal processing system；Also include a ring concentrator for offering air gap, current carrying conductor to be detected is passed through
The ring concentrator, the magneto-optic thin film is arranged between the air gap of the ring concentrator.
Further, a kind of detection side of the linear optics current sensor realized based on 4 quadrant detector is also provided
Method, optical signal is from the lasing light emitter by obtaining linearly polarized light after the polarizer；The linearly polarized light is thin by the magneto-optic
Film, the plane of polarization of the polarised light produces rotation in the presence of the current carrying conductor current field to be detected, forms one and rotates
Angle；The linearly polarized light is by after the beam expander, hot spot being amplified；Again by obtaining a shape after the radial direction analyzing grating
The hot spot that shape is fixed, hot spot and anglec of rotation synchronous rotary；The hot spot of rotation by optical signal by after the 4 quadrant detector, being turned
It is changed into electric signal, the electric signal is gathered by the signal processing system, and the size of the anglec of rotation is drawn by computing, so that
The current value to be measured in the current carrying conductor to be detected.
In one embodiment of the invention, the size of the anglec of rotation is current field intensity, thang-kng length and magneto-optic thin film expense
The linear function of your moral constant.
In one embodiment of the invention, it is by the outgoing light vector after the radial polarisation grating：
Wherein, A is polarization light amplitude, tφIt is the light transmittance of grating, θ0It is the mangneto anglec of rotation；
And the intensity distribution function of hot spot is：
In formula, R1, R2 is respectively the inside radius and outer radius of the radial polarisation grating.
In one embodiment of the invention, electric current i and the mangneto anglec of rotation that the 4 quadrant detector is detectedPass
System meets：
Wherein, L0It is ring concentrator gas length, l0It is magneto-optic thin film thickness, V is magneto-optic thin film Verdet constant.
In one embodiment of the invention, the mangneto rotation angle θ0For：
Wherein, X is the output valve of 4 quadrant detector.
Compared to prior art, the invention has the advantages that：The present invention utilizes radial polarisation grating by faraday
Angle of rotation is converted to the synchronous rotary of ring-shaped light spot striped, and the big of the mangneto anglec of rotation is obtained 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 cameras, cost
95% is reduced, superiority of effectiveness is obvious；And because 4 quadrant detector is output as analog signal, it is not big by CCD camera pixel
The limitation of small and image converter number of fibers, Measurement Resolution improves nearly 100 times, and accuracy of measurement brings up to from 0.5 grade
0.2S grades.
Brief description of the drawings
Fig. 1 is the structure of the linear optics current sensor based on 4 quadrant detector realization in one embodiment of the invention
Figure.
Fig. 2 is the structural representation of radial direction analyzing grating in one embodiment of the invention.
Fig. 3 is the structural representation of grating in radial direction analyzing grating in one embodiment of the invention.
Fig. 4 is the structural representation 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- lasing light emitters；The 2- polarizers；3- magneto-optic thin films；4- beam expanders；5- radial direction analyzing gratings；6- tetra-
Quadrant detector；7- signal processing systems.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme 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
It is set in turn in lasing light emitter 1, the polarizer 2, magneto-optic thin film 3, beam expander 4, radial direction analyzing grating 5, four-quadrant in same light path
Detector 6 and signal processing system 7；Also include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the collection magnetic
Ring, magneto-optic thin film is arranged 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 direction analyzing grating is circle, and internal diameter is 4mm,
External diameter is 5mm；Grating grizzly bar is aluminum metal, and spacing is 50nm.
Further, in the present embodiment, optical signal obtains linearly polarized light from lasing light emitter 1 by the polarizer 2, then to magneto-optic
On film 3, the plane of polarization of polarised light produces rotation in the presence of current carrying conductor current field, and the size of the anglec of rotation is electric current magnetic
The linear function of field intensity, thang-kng length and magneto-optic thin film Verdet constant, linearly polarized light is put by hot spot after beam expander 4
Greatly, then by obtaining the hot spot that a shape is fixed, hot spot and anglec of rotation synchronous rotary, the light of rotation after radial direction analyzing grating 5
Spot is changed into electric signal in 4 quadrant detector 6 by optical signal, gathers electric signal using signal processing system 7, and be by one
The arcsine and multinomial operation of row can just draw the size of the anglec of rotation, so as to obtain current value to be measured.
Further, in the present embodiment, by taking the current transformer based on radial direction analyzing as an example, its final light spot image is such as
Shown in Fig. 4.It is by the outgoing light vector after radial polarisation grating：
In formula, A is polarization light amplitude, tφIt is the light transmittance of grating, θ0It is the mangneto anglec of rotation.
Then the intensity distribution function of hot spot is：
In formula, R1, R2 is respectively the inside radius and outer radius of radial polarisation grating.
As shown in figure 5, by integral operation, drawing the light energy E in regional on 4 quadrant detectorA、EB、EC、ED
Respectively：
The input optical signal on four tunnels forms voltage, then obtain 4 quadrant detector by following computing by processing of circuit
Output valve X be：
Then can obtain mangneto rotation angle θ0For：
Electric current i and the mangneto anglec of rotation that 4 quadrant detector is detectedRelation meet：
Wherein, L0It is ring concentrator gas length, l0It is magneto-optic thin film thickness, V is Verdet constant.
Further, if Fig. 4 is the structural representation of 4 quadrant detector.As examined for linearly polarized light passes through radial direction in Fig. 5
Hot spot pattern after polarisation grid, its light spot image is fixed, and is rotated with size of current to be measured.By radial polarisation aluminum metal
Grating obtains the light spot image of synchronous rotary after being demodulated to faraday's magnetic rotation angle, light spot image is measured by 4 quadrant detector
The anglec of rotation, compared to CCD camera is used, Measurement Resolution improves nearly 100 times in ± 40 ° of mangneto rotation angles,
Accuracy of measurement has brought up to 0.2S grades from 0.5 grade, and cost reduces 95%.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function work
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (8)
1. it is a kind of based on 4 quadrant detector realize linear optics current sensor, it is characterised in that including being set in turn in
At lasing light emitter, the polarizer, magneto-optic thin film, beam expander, radial direction analyzing grating, 4 quadrant detector and signal in same light path
Reason system；Also include a ring concentrator for offering air gap, current carrying conductor to be detected passes through the ring concentrator, the magneto-optic thin film to set
Between the air gap of the ring concentrator.
2. it is according to claim 1 based on 4 quadrant detector realize linear optics current sensor detection method,
Characterized in that, the ring concentrator air gap is less than 15mm, and Distribution of Magnetic Field is uniform.
3. it is according to claim 1 based on 4 quadrant detector realize linear optics current sensor detection method,
Characterized in that, the radial direction analyzing grating is circle, internal diameter is 4mm, and external diameter is 5mm；Grating grizzly bar is aluminum metal, and spacing is
50nm。
4. a kind of detection side based on the linear optics current sensor realized based on 4 quadrant detector described in claim 1
Method, it is characterised in that optical signal is from the lasing light emitter by obtaining linearly polarized light after the polarizer；The linearly polarized light passes through
The magneto-optic thin film, the plane of polarization of the polarised light produces rotation in the presence of the current carrying conductor current field to be detected,
Form an anglec of rotation；The linearly polarized light is by after the beam expander, hot spot being amplified；Again by after the radial direction analyzing grating
Obtain the hot spot that a shape is fixed, hot spot and anglec of rotation synchronous rotary；The hot spot of rotation by after the 4 quadrant detector,
Electric signal is changed into by optical signal, the electric signal is gathered by the signal processing system, and the anglec of rotation is drawn by computing
Size, so as to obtain current value to be measured in the current carrying conductor to be detected.
5. it is according to claim 4 based on 4 quadrant detector realize linear optics current sensor detection method,
Characterized in that, the size of the anglec of rotation is the linear of current field intensity, thang-kng length and magneto-optic thin film Verdet constant
Function.
6. it is according to claim 4 based on 4 quadrant detector realize linear optics current sensor detection method,
Characterized in that, being by the outgoing light vector after the radial polarisation grating：
Wherein, A is polarization light amplitude, tφIt is the light transmittance of grating, θ0It is the mangneto anglec of rotation；
And the intensity distribution function of hot spot is：
In formula, R1, R2 is respectively the inside radius and outer radius of the radial polarisation grating.
7. it is according to claim 4 based on 4 quadrant detector realize linear optics current sensor detection method,
Characterized in that, electric current i and mangneto rotation angle θ that the 4 quadrant detector is detected0Relation meet：
Wherein, L0It is ring concentrator gas length, l0It is magneto-optic thin film thickness, V is magneto-optic thin film Verdet constant.
8. according to claim 6 or 7 based on 4 quadrant detector realize linear optics current sensor detection side
Method, it is characterised in that the mangneto rotation angle θ0For：
Wherein, X is the output valve of 4 quadrant detector.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872681A (en) * | 2018-07-16 | 2018-11-23 | 福州大学 | A kind of optical current mutual inductor realized based on bar shaped radial polarisation grating |
| 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 |
| CN109030903A (en) * | 2018-07-13 | 2018-12-18 | 福州大学 | A kind of optical voltage transformer realized based on crystal birefringence |
| CN109521243A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on circular cone Brewster prism |
| CN109521244A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on S wave plate |
| CN109521246A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on Newton's ring metal grating |
| 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109030903A (en) * | 2018-07-13 | 2018-12-18 | 福州大学 | A kind of optical voltage transformer realized based on crystal birefringence |
| CN108872681A (en) * | 2018-07-16 | 2018-11-23 | 福州大学 | A kind of optical current mutual inductor realized based on bar shaped radial polarisation 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 |
| CN109521244A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on S wave plate |
| CN109521246A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The current measuring method realized based on Newton's ring metal grating |
| 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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| CN106872754B (en) | 2019-06-07 |
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