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
- Publication number
- 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
- Authority
- CN
- China
- Prior art keywords
- light
- circular cone
- brewster
- linearly polarized
- prism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
Landscapes
- 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)
1. it is a kind of based on circular cone Brewster prism realize optical voltage transformer, it is characterized in that: by include along optical path from before
Light source, the polarizer, electro-optic crystal, quarter-wave plate, beam expanding lens, circular cone Brewster prism and the CCD set gradually backward
Imaging sensor composition；
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.
2. a kind of optical voltage transformer realized based on circular cone Brewster prism according to claim 1, feature
Be: the circular cone Brewster prism is that conical structure is formed by two kinds of different medium stackings of refractive index, and coning angle is equal to 2
(90°-θb), θbFor the Brewster's angle of two media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810776274.8A CN109030905A (en) | 2018-07-16 | 2018-07-16 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810776274.8A CN109030905A (en) | 2018-07-16 | 2018-07-16 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109030905A true CN109030905A (en) | 2018-12-18 |
Family
ID=64643125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810776274.8A Pending CN109030905A (en) | 2018-07-16 | 2018-07-16 | A kind of optical voltage transformer realized based on circular cone Brewster prism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109030905A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893655A (en) * | 2009-05-21 | 2010-11-24 | 徐启峰 | 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 | 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》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101726362B (en) | Terahertz polarization analyzer and terahertz polarization measurement method | |
| CN103308149B (en) | Machine vision is synchronously focused scanning type laser vibration detecting device | |
| CN103776537B (en) | A kind of measurement mechanism of polarised light stokes parameter and optimization method thereof | |
| CN104635129B (en) | A kind of liquid dielectric space electric field rapid measurement device and method | |
| CN106248195B (en) | The high robust homodyne laser vibration measurer and four steppings of additional phase shift compensation | |
| CN104965309A (en) | Beam splitter, achieving any polarization state output, with beam splitting ratio being continuously adjustable | |
| CN103712699A (en) | Laser pulse contrast ratio measurement device based on optical limiting | |
| JP2009168813A (en) | Apparatus for measuring residual stress of optical fiber | |
| CN109596214A (en) | A kind of laser output power detection system and detection method | |
| CN106813901A (en) | The measurement apparatus and its measuring method of optics phase-delay quantity | |
| JP2006201152A (en) | Device and method for measuring polarizing plate | |
| CN106643478B (en) | A kind of displacement measurement optical system | |
| CN109030905A (en) | A kind of optical voltage transformer realized based on circular cone Brewster prism | |
| US20170248807A1 (en) | Electro-optical phase modulation system | |
| CN103698585B (en) | Multi-range optical current sensor | |
| CN204043637U (en) | Micro-angle measurement unit | |
| CN104280620A (en) | Device for measuring space charges in transformer oil under action of surge voltages | |
| CN104236726A (en) | Spectrum phase interference device and ultrashort light pulse electric field direct reconstruction system | |
| CN203759246U (en) | Distance measuring device of point-source hologram | |
| CN108917944A (en) | A kind of optical voltage transformer realized based on Newton's ring metal grating | |
| CN107036714B (en) | A kind of spectrum phase interference apparatus and system | |
| CN102749187B (en) | Method for measuring polarization fidelity of optical film | |
| CN105182457A (en) | Polarization-maintaining type cube-corner prism | |
| CN204514579U (en) | Polarization laser autocollimating measurement instrument | |
| CN104536164B (en) | A kind of vector light beam modulating system and method based on magneto-optic effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181218 |