CN110045169A - A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade - Google Patents
A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade Download PDFInfo
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- CN110045169A CN110045169A CN201910353442.7A CN201910353442A CN110045169A CN 110045169 A CN110045169 A CN 110045169A CN 201910353442 A CN201910353442 A CN 201910353442A CN 110045169 A CN110045169 A CN 110045169A
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- magneto
- memory technique
- optic memory
- stage cascade
- current sensor
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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
-
- 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)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The present invention relates to the optical current sensors and measuring system of a kind of magneto-optic memory technique multi-stage cascade.This optical current sensor includes preceding optical fiber collimator, the polarizer, the magneto-optic memory technique component of multi-stage cascade, analyzer and rear optical fiber collimator；The magneto-optic memory technique component of multi-stage cascade is made of the relaying collimator of multiple magneto-optic memory technique sensing heads and connection magneto-optic memory technique, and relaying collimator has focusing function, is preferably collimated to the outgoing divergent beams of magneto-optic memory technique；Each component encapsulation is fixed in independent of each other, special designing shell, and each shell can be screwed and is connected and fixed；The working sensor mechanism is based on Faraday effect, the effective length of magneto-optic memory technique is increased by way of multi-stage cascade, to improve the sensitivity and resolution ratio of sensor.
Description
Technical field
The present invention relates to the optical current sensors and measuring system of a kind of magneto-optic memory technique multi-stage cascade, belong to current measurement neck
Domain.
Background technique
The various optical current sensors proposed at present, are based primarily upon Faraday magnetooptical effect to measure,
Essence is a kind of nonlinear polarization process that magneto-optic memory technique generates under the magnetic field as caused by electric current and light wave electric field collective effect.
When a branch of linearly polarized light is by magneto-optic memory technique and under magnetic fields, plane of polarization can be rotated, and size and be parallel to light
The magnetic field size of Shu Fangxiang is directly proportional, and by plane of polarization rotation angle caused by measurement electric current, the purpose of current measurement may be implemented.
Using Faraday effect optical current sensor have excellent electromagnetism interference performance, be particularly suitable for high pressure, extra-high voltage and
The adverse circumstances such as heavy impulse current.
Traditional optical current sensor generallys use the magneto-optic memory technique of Verdet constants and increases the length of magneto-optic memory technique
It spends to obtain the sensitivity and resolution ratio of higher sensor.But long magneto-optic memory technique obviously has preparation difficult, expensive
The shortcomings that, also, polarised light is larger by the diverging hot spot of its outgoing beam after long magneto-optic memory technique, wants to the collimation capability of light beam
It asks higher, the optical coupling loss of sensor is caused to further increase, to limit the sensitivity and resolution ratio of sensor.Chongqing
Yang Ming of university etc. (optical current sensor and its current measuring method based on Faraday magnetooptical effect, application publication number:
CN107643438A) using polarised light, multiple reflections increase equivalent magneto-optic memory technique length in magneto-optic memory technique, however by being polarized
Device, the integration probe of magneto-optic memory technique and analyzer insulation-encapsulated together do not have re-assemble, limit integration probe to difference
Measure the adaptability of environment.Liu Yanbing of the Central China University of Science and Technology etc. (Double-light-path optical current transformer, Authorization Notice No.:
CN2762147Y) using a square flint glass, centre-drilling hole passes through conductor from center, and plated film comes in three corner cuts
Increase equivalent magneto-optic length, however this method needs large volume of magneto-optic memory technique, and structure is extremely complex.
Summary of the invention
The present invention is directed to overcome defect of the existing technology, propose that a kind of optical current of magneto-optic memory technique multi-stage cascade passes
Sensor and measuring system increase the effective length of magneto-optic memory technique by way of multi-stage cascade, overcome only increase magneto-optic material
The mode of material length causes outgoing polarization light to have biggish transmitting mould field, to cause biggish optical coupling loss problem, mentions
The high sensitivity and resolution ratio of sensor.
Purpose is created to reach foregoing invention, the present invention adopts the following technical solutions:
A kind of optical current sensor of magneto-optic memory technique multi-stage cascade, including preceding optical fiber collimator, the polarizer, multi-stage cascade magnetic
Luminescent material component, analyzer and rear optical fiber collimator；Each component encapsulation is fixed in shell independent of each other, and each shell can revolve
Conjunction is connected and fixed, so that the magneto-optic memory technique component of preceding optical fiber collimator, the polarizer, multi-stage cascade, analyzer and rear optical fiber
Collimator is sequentially connected, and the axle center of each element is on same level straight line；Magneto-optic material is increased by way of multi-stage cascade
The effective length of material improves the sensitivity and resolution ratio of sensor, overcomes the mode of traditional increase magneto-optic memory technique length
Cause outgoing beam that there is biggish transmitting mould field, to cause biggish coupling loss problem.
Angle between the polarizer and analyzer polarization axle is 45°。
The magneto-optic memory technique component of the multi-stage cascade by least two or more magneto-optic memory technique sensing head and connection magneto-optic
The relaying collimator of material sensing head forms, and the length limited of magneto-optic memory technique sensing head is in the collimation capability of relaying collimator, institute
It states relaying collimator and is equipped with focusing knob, can preferably collimate the outgoing divergent beams of magneto-optic memory technique.
A kind of optical current sensor measuring system of magneto-optic memory technique multi-stage cascade, the magneto-optic memory technique for measuring above-mentioned are more
The cascade optical current sensor of grade, including input optical fibre, output optical fibre, laser, demodulating unit and electromagnetic interference shield dress
It sets；The preceding optical fiber collimator of input optical fibre one end connection optical current sensor, other end connecting laser, the output
Optical fiber one end connects the rear optical fiber collimator of optical current sensor, and the other end connects demodulating unit；The laser and demodulation
Unit is all placed among electromagnetic interference shielding device, completely cuts off extraneous electromagnetic interference, and the light that laser issues passes through input optical fibre
Enter optical current sensor after conduction, is entered among demodulating unit by output optical fibre later.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage:
Traditional optical current sensor generallys use the length of increase magneto-optic memory technique to obtain the sensitivity of higher sensor
And resolution ratio, but this mode obviously has the shortcomings that preparation is difficult, expensive, and its collimation capability requirement to light beam
It is higher, cause the optical coupling loss of sensor to further increase, to limit the sensitivity and resolution ratio of sensor.And this hair
The bright effective length that magneto-optic memory technique is increased by way of multi-stage cascade improves the sensitivity and resolution ratio of sensor, gram
The mode for having taken traditional increase magneto-optic memory technique length causes outgoing beam to have biggish transmitting mould field, to cause biggish
Coupling loss problem；For using modular shell structure, sensor structure is compact, flexibility and changeability, assembles simply, can criticize
Amount production.
Detailed description of the invention
Fig. 1 is a kind of optical current sensor structural schematic diagram of magneto-optic memory technique multi-stage cascade of the invention.
Fig. 2 is a kind of optical current sensor measuring system structural schematic diagram of magneto-optic memory technique multi-stage cascade of the invention.
Fig. 3 is Faraday effect schematic illustration.
Specific embodiment
The present invention is described in further details below by preferred embodiment combination attached drawing.
As shown in Figure 1, a kind of optical current sensor of magneto-optic memory technique multi-stage cascade, including preceding optical fiber collimator 1, it is polarized
Device 2, the magneto-optic memory technique component 3 of multi-stage cascade, analyzer 4 and rear optical fiber collimator 5；Each component encapsulation is fixed on independent of each other
In shell, each shell can be screwed and is connected and fixed, so that the magneto-optic material of preceding optical fiber collimator 1, the polarizer 2, multi-stage cascade
Material component 3, analyzer 4 and rear optical fiber collimator 5 are sequentially connected, and the axle center of each element is on same level straight line, and described
Angle between 4 polarization axle of inclined device 2 and analyzer is 45°；Its working mechanism is the Faraday effect based on polarised light, by more
The cascade mode of grade increases the effective length of magneto-optic memory technique, improves the sensitivity and resolution ratio of sensor.
Each component encapsulation is fixed in independent of each other, special designing shell, the optic path of optical element in shell
Characteristic is entangled in the design feature of shell, and the optical design of the optimization met.
The magneto-optic memory technique component 3 of the multi-stage cascade by least two or more magneto-optic memory technique sensing head 31 and connection magnetic
The relaying collimator 32 of luminescent material sensing head 31 forms, the length of magneto-optic memory technique sensing head 31 can flexible design, but be limited to
After the collimation capability of collimator 32, the relaying collimator 32 is equipped with focusing knob, can preferably collimate going out for magneto-optic memory technique
Penetrate divergent beams.
As shown in Fig. 2, a kind of optical current sensor measuring system of magneto-optic memory technique multi-stage cascade, above-mentioned for measuring
The optical current sensor of magneto-optic memory technique multi-stage cascade, including input optical fibre 7, output optical fibre 8, laser 9,10 He of demodulating unit
Electromagnetic interference shielding device 11；The preceding optical fiber collimator 1 of 7 one end of input optical fibre connection optical current sensor 6, the other end
Connecting laser 9, the rear optical fiber collimator 5 of 8 one end of output optical fibre connection optical current sensor 6, other end connection solution
Adjust unit 10；The laser 9 and demodulating unit 10 are all placed among electromagnetic interference shielding device 11, and it is dry to completely cut off extraneous electromagnetism
It disturbs, the light that laser 9 issues passes through output optical fibre 8 by entering optical current sensor 6 after the conduction of input optical fibre 7 later
Into among demodulating unit 10.
As shown in figure 3, the optical current sensor of the present embodiment magneto-optic memory technique multi-stage cascade is based primarily upon Faraday effect
Come what is measured, firstly, laser beam is collimated after input optical fibre 7 using preceding optical fiber collimator 1；Secondly, laser beam
Rising through the polarizer 2 to the rear becomes space parallel polarized light；Then, polarised light by the magneto-optic memory technique component 3 of multi-stage cascade and
Under magnetic fields, plane of polarization rotation angle isφ F , and it is directly proportional to dash current size；Then, polarised light is examined through analyzer 4
It is to the rear to export the constant polarised light in polarization direction again, but its watt level be reduced to original cos (45 °+φ F )2Times, wherein rising
Angle between 4 polarization axle of inclined device 2 and analyzer is 45°；Finally, polarised light is input in demodulating unit 10 through output optical fibre 8,
It is detected by photodetector, to establish the functional relation of " optical power-plane of polarization rotation angle ", thus anti-release generates magnetic field
Size of current achievees the purpose that current detecting.
Claims (4)
1. a kind of optical current sensor of magneto-optic memory technique multi-stage cascade, which is characterized in that including preceding optical fiber collimator (1), rise
Inclined device (2), the magneto-optic memory technique component (3) of multi-stage cascade, analyzer (4) and rear optical fiber collimator (5)；Each component encapsulation is fixed on
In shell independent of each other, each shell can be screwed and is connected and fixed, so that preceding optical fiber collimator (1), the polarizer (2), more
The cascade magneto-optic memory technique component (3) of grade, analyzer (4) and rear optical fiber collimator (5) are sequentially connected, and the axle center of each element is same
On one horizontal linear；The effective length that magneto-optic memory technique is increased by way of multi-stage cascade improves the sensitivity of sensor
And resolution ratio.
2. the optical current sensor of magneto-optic memory technique multi-stage cascade according to claim 1, which is characterized in that described to be polarized
Angle between device (2) and analyzer (4) polarization axle is 45°。
3. the optical current sensor of magneto-optic memory technique multi-stage cascade according to claim 1, which is characterized in that the multistage
Cascade magneto-optic memory technique component (3) by least two or more magneto-optic memory technique sensing head (31) and connection magneto-optic memory technique sensing head
(31) relaying collimator (32) composition, the length limited of magneto-optic memory technique sensing head (31) is in the collimation energy of relaying collimator (32)
Power, the relaying collimator (32) are equipped with focusing knob, can preferably collimate the outgoing divergent beams of magneto-optic memory technique.
4. a kind of optical current sensor measuring system of magneto-optic memory technique multi-stage cascade, for measuring any one of claims 1 to 3
The optical current sensor of the magneto-optic memory technique multi-stage cascade, which is characterized in that including input optical fibre (7), output optical fibre
(8), laser (9), demodulating unit (10) and electromagnetic interference shielding device (11)；Described input optical fibre (7) one end connects optics
The preceding optical fiber collimator (1) of current sensor (6), other end connecting laser (9), described output optical fibre (8) one end connect light
The rear optical fiber collimator (5) of current sensor (6) is learned, the other end connects demodulating unit (10)；The laser (9) and demodulation are single
First (10) are all placed among electromagnetic interference shielding device (11), completely cut off extraneous electromagnetic interference, and the light that laser (9) issues passes through
Enter optical current sensor (6) after input optical fibre (7) conduction, enters demodulating unit (10) by output optical fibre (8) later
Among.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910353442.7A CN110045169A (en) | 2019-04-29 | 2019-04-29 | A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade |
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| CN201910353442.7A CN110045169A (en) | 2019-04-29 | 2019-04-29 | A kind of optical current sensor and measuring system of magneto-optic memory technique multi-stage cascade |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726862A (en) * | 2019-10-24 | 2020-01-24 | 贵州电网有限责任公司 | Integrated optical sensor probe for measuring broadband high-amplitude current |
| CN110726863A (en) * | 2019-10-24 | 2020-01-24 | 贵州电网有限责任公司 | Double-probe non-contact current measuring device and method for power transmission line |
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| CN2093400U (en) * | 1991-05-07 | 1992-01-15 | 北方交通大学 | Optical fibre current sensor |
| CN101672870A (en) * | 2009-08-13 | 2010-03-17 | 苏州纳米技术与纳米仿生研究所 | Magneto-optic current transducer and manufacturing method thereof |
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
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| EP3104183A1 (en) * | 2015-06-10 | 2016-12-14 | Lumiker Aplicaciones Tecnologicas S.L. | Current measuring equipment based on optical fiber for measuring the current circulating through a conductor and the associated method |
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2019
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Patent Citations (8)
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| CN2093400U (en) * | 1991-05-07 | 1992-01-15 | 北方交通大学 | Optical fibre current sensor |
| CN101672870A (en) * | 2009-08-13 | 2010-03-17 | 苏州纳米技术与纳米仿生研究所 | Magneto-optic current transducer and manufacturing method thereof |
| CN102830258A (en) * | 2012-08-24 | 2012-12-19 | 易能（中国）电力科技有限公司 | Optical current sensing system and current measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726862A (en) * | 2019-10-24 | 2020-01-24 | 贵州电网有限责任公司 | Integrated optical sensor probe for measuring broadband high-amplitude current |
| CN110726863A (en) * | 2019-10-24 | 2020-01-24 | 贵州电网有限责任公司 | Double-probe non-contact current measuring device and method for power transmission line |
| CN110726863B (en) * | 2019-10-24 | 2022-06-21 | 贵州电网有限责任公司 | Double-probe non-contact current measuring device and method for power transmission line |
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Application publication date: 20190723 |