CN109030905A - A kind of optical voltage transformer realized based on circular cone Brewster prism - Google Patents
A kind of optical voltage transformer realized based on circular cone Brewster prism Download PDFInfo
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- CN109030905A CN109030905A CN201810776274.8A CN201810776274A CN109030905A CN 109030905 A CN109030905 A CN 109030905A CN 201810776274 A CN201810776274 A CN 201810776274A CN 109030905 A CN109030905 A CN 109030905A
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- light
- linearly polarized
- polarized light
- brewster
- prism
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- 230000003287 optical effect Effects 0.000 title claims abstract description 22
- 230000010287 polarization Effects 0.000 claims abstract description 17
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 230000005684 electric field Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- 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
- G01R15/241—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using electro-optical modulators, e.g. electro-absorption
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention relates to a kind of optical voltage transformers realized based on circular cone Brewster prism, by including that the light source set gradually from front to back along optical path, the polarizer, electro-optic crystal, quarter-wave plate, beam expanding lens, circular cone Brewster prism and ccd image sensor form.Circular cone Brewster prism of the present invention is the conical structure formed by two kinds of different medium stackings of refractive index, and cone angle passes through special designing, so that the incidence angle of glancing incidence light is equal to Brewster's angle.After incident light passes through the prism, angular polarization component almost reflects, and radial polarisation light is only contained in transmitted light.Linearly polarized light can be converted to the circular light spot with dark line by circular cone Brewster prism, and the direction of dark line and the plane of polarization of linearly polarized light are vertical.By positioning dark line, it can be achieved that electric light phase delay angle direct measurement, to calculate electric field to be measured.
Description
Technical field
The invention belongs to power system voltage field of measuring technique, more particularly to a kind of real based on circular cone Brewster prism
Existing optical voltage transformer.
Background technique
Optical voltage transformer measures voltage using the electrooptic effect of optical material, has conventional electromagnetic or capacitive battery
The advantage for pressing mutual inductor incomparable.With the fast development of smart grid, optical voltage transformer relies on its superior performance
It will be widely applied in the power system.Optical voltage transformer mostly uses polarization interference demodulation method at present, by electric light phase
Position delay is converted to intensity modulation, and the size by detecting light intensity is indirect, approximately linearly measures voltage.This measurement method master
Have the following problems: 1) measurement range is small.It is only capable of approximately linearly measuring limited electric light phase delay, limits mutual inductor
Measurement range;2) optical power correlation.Influence of the accuracy of measurement vulnerable to optical power fluctuation reduces mutual inductor reliability and length
The stability of phase operation;3) temperature drift problem.The temperature drift of light source, optical device, electrooptical device and electronic device directly affects
The size of output intensity, leads to measurement error.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of optical voltage realized based on circular cone Brewster prism is mutual
Sensor can linearly measure electric light phase delay angle, and measurement range is not limited by crystal half-wave voltage, measurement result with
Optical power size is unrelated.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of optical voltage transformer realized based on circular cone Brewster prism, it is characterized in that: by including along optical path from forward direction
Light source, the polarizer, electro-optic crystal, quarter-wave plate, beam expanding lens, circular cone Brewster prism and the CCD figure set gradually afterwards
As sensor forms;
The light source and the polarizer generate linearly polarized light;The linearly polarized light makes linearly polarized light by electro-optic crystal, electrooptic effect
It is the orthogonal linearly polarized light o light and e light in two polarization directions along inductive axis Directional Decomposition;
The polarised light o light and e light synthesize new linearly polarized light by quarter-wave plate, and electric light phase delay is converted into line
The rotation of polarised light plane of polarization;After the new linearly polarized light is expanded by beam expanding lens, using circular cone Brewster prism, formed
There is the circular light spot of dark fringe;The circular light spot of the dark fringe is sent to ccd image sensor;Ccd image sensor is used for
The direction for positioning the circular light spot dark line of the dark fringe obtains the rotation angle of line polarisation plane of polarization, to calculate to be measured
Electric field.
Further, the circular cone Brewster prism is to form circular cone knot by two kinds of different medium stackings of refractive index
Structure, coning angle are equal to 2 (90 ° of-θb), θbFor the Brewster's angle of two media.
Compared with the prior art, the invention has the following beneficial effects:
1, the present invention can linearly measure electric light phase delay angle, and measurement range is big.
2, measurement result of the present invention is unrelated with optical power size, only related with the distribution of light intensity, accuracy of measurement not light
The influence of power swing improves mutual inductor reliability and long-term running stability.
Detailed description of the invention
Fig. 1 is principle of the invention figure
Fig. 2 is the schematic diagram of circular cone Brewster prism in one embodiment of the invention;
Fig. 3 is radial polarisation light incidence circular cone Brewster prism schematic diagram in one embodiment of the invention;
Wherein: 1- light source, 2- polarizing film, 3- electro-optic crystal, 4- quarter-wave plate, 5- beam expander, 6- circular cone Brewster rib
Mirror, 7-CCD imaging sensor.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is please referred to, the present invention provides a kind of optical voltage transformer realized based on circular cone Brewster prism, special
Sign is: by including the light source 1 set gradually from front to back along optical path, the polarizer 2, electro-optic crystal 3, quarter-wave plate 4, expanding
Mirror 5, circular cone Brewster prism 6 and ccd image sensor composition 7;
The light beam that light source 1 issues obtains linearly polarized light after the polarizer 2, and plane of polarization is parallel to vertical direction.Pass through electric light
After crystal 3, linearly polarized light o light and e that electrooptic effect keeps linearly polarized light orthogonal along two polarization directions of inductive axis Directional Decomposition
Light.Since the refractive index of two polarization directions is different, generation electric light phase is prolonged after o light and e light propagate certain distance in crystal
Late, and under the action of quarter-wave plate 4 linearly polarized light is synthesized, electric light phase delay is converted into linearly polarized light plane of polarization
Rotation.After linearly polarized light expands, by circular cone Brewster prism 6, it is formed with the circular light spot of dark fringe.The side of dark fringe
To the plane of polarization exact vertical with line polarisation.The direction of dark line is positioned by ccd image sensor 7, available line polarisation is inclined
The rotation angle in vibration face, to calculate electric field level.
Circular cone Brewster prism is formed by two kinds of different medium stackings of refractive index, and cross-section structure is as shown in Fig. 2,
If Brewster's angle isθ b , circular cone cone angle be 2 (90 °-θ b ).When light is with horizontal direction incidence, incidence angleθ i It is equal toθ b .Such as Fig. 3
Shown, the polarization direction of radial polarisation light is parallel to the plane of incidence, is shown with double arrowed line segment table;The polarization direction of angularly polarized light with
The plane of incidence is vertical, is indicated with dot.According to Brewster's law, after incident light is by one layer of medium interface, radial polarisation light
Reflectivity is 0, and part angularly polarized light is reflected.Behind multilayer interface, angular polarization component almost reflects, transmission
Only contain radial polarisation light in light.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (2)
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CN201810776274.8A CN109030905A (en) | 2018-07-16 | 2018-07-16 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
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CN201810776274.8A CN109030905A (en) | 2018-07-16 | 2018-07-16 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101893655A (en) * | 2009-05-21 | 2010-11-24 | 徐启峰 | A digital optical current sensor |
CN103675391A (en) * | 2012-09-04 | 2014-03-26 | 徐启峰 | Radial analyzer type optical voltage sensor |
CN104777342A (en) * | 2015-04-16 | 2015-07-15 | 福州大学 | Device and method for linearly and rapidly measuring half-wave voltage of linear electro-optical crystal |
CN106597053A (en) * | 2017-01-24 | 2017-04-26 | 福州大学 | Straight optical path linear optical current sensor and current detection method |
CN106872754A (en) * | 2017-01-24 | 2017-06-20 | 福州大学 | The linear optics current sensor and detection method realized based on 4 quadrant detector |
-
2018
- 2018-07-16 CN CN201810776274.8A patent/CN109030905A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101893655A (en) * | 2009-05-21 | 2010-11-24 | 徐启峰 | A digital optical current sensor |
CN103675391A (en) * | 2012-09-04 | 2014-03-26 | 徐启峰 | Radial analyzer type optical voltage sensor |
CN104777342A (en) * | 2015-04-16 | 2015-07-15 | 福州大学 | Device and method for linearly and rapidly measuring half-wave voltage of linear electro-optical crystal |
CN106597053A (en) * | 2017-01-24 | 2017-04-26 | 福州大学 | Straight optical path linear optical current sensor and current detection method |
CN106872754A (en) * | 2017-01-24 | 2017-06-20 | 福州大学 | The linear optics current sensor and detection method realized based on 4 quadrant detector |
Non-Patent Citations (2)
Title |
---|
YUICHI KOZAWA ET AL.: "Generation of a radially polarized laser beam by use of a conical Brewster prism", 《OPTICS LETTERS》 * |
谭巧 等: "实现线性测量的光学电压传感器设计", 《电力系统自动化》 * |
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