CN103163360A - Optical current sensor and current measurement method based on comparative measurement structure - Google Patents
Optical current sensor and current measurement method based on comparative measurement structure Download PDFInfo
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- CN103163360A CN103163360A CN2013100902881A CN201310090288A CN103163360A CN 103163360 A CN103163360 A CN 103163360A CN 2013100902881 A CN2013100902881 A CN 2013100902881A CN 201310090288 A CN201310090288 A CN 201310090288A CN 103163360 A CN103163360 A CN 103163360A
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Abstract
The invention belongs to the technical field of optical current sensors, discloses an optical current sensor and a current measurement method based on a comparative measurement structure and aims to solve the problem that a measurement result of a lead current is inaccurate because the Verdet constant of a magneto-optical material in the conventional optical current sensor is influenced by temperature change. A laser beam emitted by a laser generator of the sensor is subjected to light splitting by a light splitter to form a measurement light beam and a reference light beam, wherein the measurement light beam is transmitted to first magneto-optical glass, a first polarization analyzer and a first photoelectric detector sequentially after being polarized by a first polarizer; and the reference light beam is transmitted to second magneto-optical glass, a second polarization analyzer and a second photoelectric detector after being polarized by a second polarizer. By the method, the magnetic field intensity of the first magneto-optical glass is acquired according to Faraday deflection angles of the first magneto-optical glass and the second magneto-optical glass and the magnetic field intensity of the second magneto-optical glass, so that a value of current in an electrified coil is obtained. The sensor is applied to measurement of the current in the electrified coil.
Description
Technical field
The method that the present invention relates to measure based on the comparison the optical current sensor of structure and measure electric current belongs to the optical current sensor technical field.
Background technology
In optical current sensor, light is by faraday's deflection angle φ=VHL of magneto-optic memory technique, wherein V is the Verdet constant of magneto-optic memory technique, H is magnetic field intensity, L is magneto-optic memory technique length, and faraday's deflection angle φ obtains by measurement, like this in the situation that known Verdet constant V and magneto-optic memory technique length L, can calculate magnetic field intensity H, then by Ampere circuit law and then calculate current in wire.In this classic method, Verdet constant V can cause the magnetic field intensity H that obtains that error is arranged due to the impact that is subject to temperature variation, and then causes the measurement result of current in wire inaccurate.
Summary of the invention
The present invention seeks in order to solve in existing optical current sensor, the Verdet constant of magneto-optic memory technique is due to the impact that is subject to temperature variation, cause the inaccurate problem of measurement result of current in wire, a kind of method of measuring based on the comparison the optical current sensor of structure and measuring electric current is provided.
The optical current sensor of measuring based on the comparison structure of the present invention, it comprises laser generator, optical splitter, first polarizer, the first magneto-optic glass, hot-wire coil, the first analyzer, the first photodetector, second polarizer, the second magneto-optic glass, the second analyzer and the second photodetector
Hot-wire coil is spirally wound on the outside surface of the first magneto-optic glass, forms the gage beam of sensor; Be provided with the flat permanent magnet body on the upper surface of the second magneto-optic glass and lower surface, the second magneto-optic glass and plate shaped permanent magnet form the reference arm of sensor, described reference arm and gage beam vertical setting mutually, reference arm is perpendicular to the upper surface of the second magneto-optic glass;
The laser beam of laser generator emission forms measuring beam and reference beam after the optical splitter light splitting,
Measuring beam is incident to the first magneto-optic glass after first polarizer rises partially, the outgoing beam of the first magneto-optic glass is incident to the light receiving surface of the first photodetector after the first analyzer analyzing;
Reference beam is incident to the second magneto-optic glass after second polarizer rises partially, the outgoing beam of the second magneto-optic glass is incident to the light receiving surface of the second photodetector after the second analyzer analyzing.
Described the first magneto-optic glass and the second magneto-optic glass are identical magneto-optic glass.
Adopt the above-mentioned optical current sensor of measuring based on the comparison structure to measure the method for electric current,
By passing through faraday's deflection angle of the first magneto-optic glass in gage beam
Wherein V is the Verdet constant of the first magneto-optic glass and the second magneto-optic glass, H
xBe the magnetic field intensity of the first magneto-optic glass, L is the length of the first magneto-optic glass and the second magneto-optic glass,
Pass through faraday's deflection angle of the second magneto-optic glass in reference arm
H
NBe the magnetic field intensity of the second magneto-optic glass,
With the acquisition of being divided by of above-mentioned two formulas:
Faraday's deflection angle by the first magneto-optic glass
Faraday's deflection angle of the second magneto-optic glass
And the magnetic field intensity H of the second magneto-optic glass
N, calculate the magnetic field intensity H that obtains the first magneto-optic glass
x, then by Ampere circuit law, calculate the current value that obtains in hot-wire coil.
Advantage of the present invention: the present invention adopts measuring beam and reference beam to be furnished with respectively the second magneto-optic glass of flat permanent magnet body in the first magneto-optic glass by being wound with hot-wire coil in gage beam and reference arm, material and the size of the first magneto-optic glass and the second magneto-optic glass are identical, induced field and magnetic field of permanent magnet for fear of hot-wire coil influence each other, two magneto-optic glass vertical placements mutually.According to Faraday magnetooptical effect, can measure the relation of magnetic field intensity and optical path length on Faraday rotation angle and Verdet constant in reference arm and gage beam, optical propagation direction, and by calculating parameter Relations Among in two arms.Owing to calculating in the electric current process that obtains in tested hot-wire coil, do not use Verdet constant, thereby avoided affecting by temperature the error of bringing, make current measurement result accurate.
The present invention has eliminated the impact of temperature on the magneto-optic glass Verdet constant from mathematical principle, has reduced to greatest extent the Verdet constant error that temperature causes, thereby has relaxed the selection to the magneto-optic glass material.Employing has the paramagnetic glass of higher Verdet constant, can obtain higher sensitivity, obtains more accurate measurement result.
Description of drawings
Fig. 1 is the theory diagram of measuring based on the comparison the optical current sensor of structure of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described optical current sensor of measuring based on the comparison structure of present embodiment, it comprises laser generator 1, optical splitter 2, first polarizer 3, the first magneto-optic glass 4, hot-wire coil 5, the first analyzer 6, the first photodetector 7, second polarizer 8, the second magneto-optic glass 9, the second analyzer 10 and the second photodetector 11
Hot-wire coil 5 is spirally wound on the outside surface of the first magneto-optic glass 4, forms the gage beam B of sensor; Be provided with flat permanent magnet body 9-1 on the upper surface of the second magneto-optic glass 9 and lower surface, the second magneto-optic glass 9 and plate shaped permanent magnet 9-1 form the reference arm A of sensor, described reference arm A and gage beam B vertical setting mutually, reference arm A is perpendicular to the upper surface of the second magneto-optic glass 9;
The laser beam of laser generator 1 emission forms measuring beam a and reference beam b after optical splitter 2 light splitting,
Measuring beam a is incident to the first magneto-optic glass 4, the first magneto-optic glasses 4 after partially through 3 of first polarizers outgoing beam is incident to the light receiving surface of the first photodetector 7 after the first analyzer 6 analyzings;
Reference beam b is incident to the second magneto-optic glass 9, the second magneto-optic glasses 9 after partially through 8 of second polarizers outgoing beam is incident to the light receiving surface of the second photodetector 11 after the second analyzer 10 analyzings.
In present embodiment, measuring beam a through first polarizer 3 after by being wound with the first magneto-optic glass 4 of hot-wire coil 5, certain rotation occurs in its polarization direction, and the linearly polarized light after deflection is incident to and changes light signal into electric signal after the first analyzer 6, the first photodetectors 7 receive.Reference beam b rises partially afterwards by being furnished with the second magneto-optic glass 9 of flat permanent magnet body 9-1, and its polarization direction also deflects.Two magneto-optic glass vertical placements mutually can adopt nonmagnetic substance to fix.
Reference arm A is mutually vertical with gage beam B, guarantees that the placement of the first magneto-optic glass 4 and the second magneto-optic glass 9 is also mutually vertical.
Embodiment two: present embodiment is described further embodiment one, and described the first magneto-optic glass 4 of present embodiment and the second magneto-optic glass 9 are identical magneto-optic glass 9.
In present embodiment, the composition material of the first magneto-optic glass 4 and the second magneto-optic glass 9 is in full accord, and namely its component concentration is identical, and consistent size.
Embodiment three: present embodiment is measured the method for electric current for the described optical current sensor of measuring based on the comparison structure of employing embodiment one or two,
By passing through faraday's deflection angle of the first magneto-optic glass 4 in gage beam B
Wherein V is the Verdet constant of the first magneto-optic glass 4 and the second magneto-optic glass 9, H
xBe the magnetic field intensity of the first magneto-optic glass 4, L is the length of the first magneto-optic glass 4 and the second magneto-optic glass 9,
Pass through faraday's deflection angle of the second magneto-optic glass 9 in reference arm A
H
NBe the magnetic field intensity of the second magneto-optic glass 9,
With the acquisition of being divided by of above-mentioned two formulas:
Faraday's deflection angle by the first magneto-optic glass 4
Faraday's deflection angle of the second magneto-optic glass 9
And the magnetic field intensity H of the second magneto-optic glass 9
N, calculate the magnetic field intensity H that obtains the first magneto-optic glass 4
x, then by Ampere circuit law, calculate the current value that obtains in hot-wire coil 5.
In present embodiment, by Ampere circuit law, the first magneto-optic glass 4 there is ∫
LH
xDL=Ni can calculate the size of the current i in hot-wire coil 5, thereby monitors electric current in wire.If electric current abnormal, starting protection device.Wherein N is the coil turn of hot-wire coil 5.
Claims (3)
1. optical current sensor of measuring based on the comparison structure, it is characterized in that, it comprises laser generator (1), optical splitter (2), first polarizer (3), the first magneto-optic glass (4), hot-wire coil (5), the first analyzer (6), the first photodetector (7), second polarizer (8), the second magneto-optic glass (9), the second analyzer (10) and the second photodetector (11)
Hot-wire coil (5) is spirally wound on the outside surface of the first magneto-optic glass (4), forms the gage beam (B) of sensor; Be provided with flat permanent magnet body (9-1) on the upper surface of the second magneto-optic glass (9) and lower surface, the second magneto-optic glass (9) and plate shaped permanent magnet (9-1) form the reference arm (A) of sensor, described reference arm (A) and gage beam (B) vertical setting mutually, reference arm (A) is perpendicular to the upper surface of the second magneto-optic glass (9);
The laser beam of laser generator (1) emission forms measuring beam (a) and reference beam (b) after optical splitter (2) light splitting,
Measuring beam (a) is incident to the first magneto-optic glass (4) after first polarizer (3) rises partially, the outgoing beam of the first magneto-optic glass (4) is incident to the light receiving surface of the first photodetector (7) after the first analyzer (6) analyzing;
Reference beam (b) is incident to the second magneto-optic glass (9) after second polarizer (8) rises partially, the outgoing beam of the second magneto-optic glass (9) is incident to the light receiving surface of the second photodetector (11) after the second analyzer (10) analyzing.
2. the optical current sensor of measuring based on the comparison structure according to claim 1, is characterized in that, described the first magneto-optic glass (4) and the second magneto-optic glass (9) are identical magneto-optic glass (9).
3. a method that adopts the described optical current sensor of measuring based on the comparison structure of claim 1 to measure electric current, is characterized in that,
By passing through faraday's deflection angle of the first magneto-optic glass (4) in gage beam (B)
Wherein V is the Verdet constant of the first magneto-optic glass (4) and the second magneto-optic glass (9), H
xBe the magnetic field intensity of the first magneto-optic glass (4), L is the length of the first magneto-optic glass (4) and the second magneto-optic glass (9),
Pass through faraday's deflection angle of the second magneto-optic glass (9) in reference arm (A)
H
NBe the magnetic field intensity of the second magneto-optic glass (9),
With the acquisition of being divided by of above-mentioned two formulas:
Faraday's deflection angle by the first magneto-optic glass (4)
Faraday's deflection angle of the second magneto-optic glass (9)
And the magnetic field intensity H of the second magneto-optic glass (9)
N, calculate the magnetic field intensity H that obtains the first magneto-optic glass (4)
x, then by Ampere circuit law, calculate the current value that obtains in hot-wire coil (5).
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698583A (en) * | 2014-01-08 | 2014-04-02 | 哈尔滨工业大学 | Flake film pasting optical current sensor |
| CN103837716A (en) * | 2012-08-29 | 2014-06-04 | 北京恒信创光电技术有限公司 | Fixing device of optical current transformer |
| CN105629033A (en) * | 2016-02-03 | 2016-06-01 | 河北大学 | Device and method for measuring conductor current through employing magneto-optic materials |
| CN105866506A (en) * | 2016-04-01 | 2016-08-17 | 河北大学 | Apparatus and method for measuring conductor current by using magneto-optic material |
| CN105954564A (en) * | 2016-05-19 | 2016-09-21 | 河北大学 | Device and method for measuring current of conductor via magneto-optic materials |
| CN106597053A (en) * | 2017-01-24 | 2017-04-26 | 福州大学 | Straight optical path linear optical current sensor and current detection method |
| CN110441585A (en) * | 2019-08-27 | 2019-11-12 | 哈尔滨工业大学 | A kind of optical DC current measuring device and method based on TGG crystal and double correlation detection technology |
| CN113533826A (en) * | 2021-07-15 | 2021-10-22 | 深圳普泰电气有限公司 | High-precision current monitoring and processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103837716A (en) * | 2012-08-29 | 2014-06-04 | 北京恒信创光电技术有限公司 | Fixing device of optical current transformer |
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| CN105866506A (en) * | 2016-04-01 | 2016-08-17 | 河北大学 | Apparatus and method for measuring conductor current by using magneto-optic material |
| CN105866506B (en) * | 2016-04-01 | 2018-06-22 | 河北大学 | A kind of device and method that conductor current is measured using magneto-optic memory technique |
| CN105954564A (en) * | 2016-05-19 | 2016-09-21 | 河北大学 | Device and method for measuring current of conductor via magneto-optic materials |
| CN105954564B (en) * | 2016-05-19 | 2018-06-22 | 河北大学 | A kind of device and method that conductor current is measured using magneto-optic memory technique |
| CN106597053A (en) * | 2017-01-24 | 2017-04-26 | 福州大学 | Straight optical path linear optical current sensor and current detection method |
| CN110441585A (en) * | 2019-08-27 | 2019-11-12 | 哈尔滨工业大学 | A kind of optical DC current measuring device and method based on TGG crystal and double correlation detection technology |
| CN113533826A (en) * | 2021-07-15 | 2021-10-22 | 深圳普泰电气有限公司 | High-precision current monitoring and processing system |
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Application publication date: 20130619 |