CN101351714A - Fiber optic current sensor - Google Patents
Fiber optic current sensor Download PDFInfo
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- CN101351714A CN101351714A CNA2006800334699A CN200680033469A CN101351714A CN 101351714 A CN101351714 A CN 101351714A CN A2006800334699 A CNA2006800334699 A CN A2006800334699A CN 200680033469 A CN200680033469 A CN 200680033469A CN 101351714 A CN101351714 A CN 101351714A
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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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Abstract
A fiber optic current sensor includes a polarization beam splitter. The polarization beam splitter operates, in the forward path, to polarize light that is transmitted through a reciprocal port toward a Faraday rotator. The polarization beam splitter operates, in a reverse path, to direct light to a photodetector through a non-reciprocal port.
Description
Background of invention
The present invention relates to Fibre Optical Sensor, be specifically related to fibre optic current sensor.
Fibre optic current sensor is based on Faraday effect work.The current-induced magnetic field of flowing in lead, this magnetic field make the light polarization face rotation of advancing by Faraday effect in the optical fiber that twines current carrying conductor.Faraday's law can be expressed as:
I＝∮HdL (1)
Wherein I is an electric current, and H is magnetic field, and integration is to carry out on the closed path of electric current.If sensor fibre twines current carrying conductor with the integer circle, and the every bit in the sensor fibre all has the constant sensitivity in magnetic field, the electric current of carrying is depended in the rotation of the polarization surface of then propagating in optical fiber in lead, and it is insensitive to all outside magnetic fields that produce, for example the magnetic field that is caused by the electric current of carrying in the lead nearby.When magnetic field existed, the angle ΔΦ that polarization surface rotates through was provided by following formula:
ΔΦ＝V∫H.dL (2)
Wherein V is Wei Erde (Verdet) constant of glass fibre.
Sensor fibre carries out line integral along its path to magnetic field, and when this path was closed on himself, magnetic field was proportional to the electric current in the lead.Therefore, ΔΦ=VNI, wherein N is the number of turns of twining the sensor fibre of current carrying conductor.The rotation of the polarization state that causes owing to the existence of electric current can be measured in the following manner,, injects the light with clear and definite linear polarization in sensing unit that is, then at light from sensing unit outgoing post analysis polarization state of light.Alternatively, ΔΦ is represented the excess phase shift by the circularly polarized light generation of propagating in sensor fibre.
This technology relates to the coaxial optical fiber current sensor, as license to the 5th of being entitled as of inventor James N.Blake " Fiber Optic Interferometric Circuit andMagnetic Field Sensor " (optical fibre interference circuit and magnetic field sensor) on July 1st, 1997,644, disclosed coaxial optical fiber current sensor in No. 397 United States Patent (USP)s, this patent is incorporated this paper by reference into.Fibre Optical Sensor also licenses to the 5th of being entitled as of inventor James N.Blake " Fiber Optics Apparatus and Method for Accurate Current Sensing " (fiber device and the method that are used for the precise current sensing) on Dec 9th, 1997,696, No. 858 United States Patent (USP)s and license to the 6th of being entitled as of inventor James N.Blake " Fiber OpticsCurrent Sensor " (fibre optic current sensor), 188, disclosed in No. 811 United States Patent (USP)s, the disclosure of above-mentioned two patents is incorporated this paper by reference into.
Disclosed fibre optic current sensor is replicated among Fig. 1 of this paper in the ' No. 811 patents.Wherein, be transmitted to 45 degree joints 13 from the light of light source 10 by coupling mechanism 11 and polarizer 12, light is equally divided into two polarization states that always remain on the remainder of light path at joint 13 places.The phase place of the light in 14 pairs of described two polarization states of piezoelectric birefringence modulator is carried out differential modulation.Modulator 14 is driven by modulator signal generator 71, and modulator signal generator 71 provides has square wave or periodicity alternating signal sinusoidal wave, electricity.Light is propagated by lag line 15, mode converter 16 and the cell winding through optimizing 17 then, and wherein mode converter 16 is converted to two circular polarization states with two linear polarization.Cell winding 17 through optimizing twines current carrying conductor 18.Light 19 reflections and return along its path by light path from the reflection termination arrive detector 20 at last.Open-loop signal processor 21 is output 22 with the conversion of signals that detects, and output 22 can be illustrated in the electric current that flows in the current carrying conductor 18.The ' No. 811 patent has also been described such embodiment, and wherein Faraday rotator and mode converter can be used to replace birefringence modulator 14 with no seedbed bias current sensor.
Coupling mechanism 11 can be embodied as the 3dB optically coupled device also with intrinsic optical loss drawing-in system.Intrinsic optical loss is meant, when desirable equipment energy characteristic of supposition and the loss outside the remover itself (for example being attributable to the loss of light joint), and the loss that will exist in the fibre optic current sensor.For example, during 19 the forward-propagating from light source 10 to the reflection termination, a part (for example, the making an appointment with half) light that is produced by light source 10 is by in coupling mechanism 11 coupled into optical fibres 24, and advances (being represented by arrow A) away from detector 20.Because this luminous energy is not used in current sense is measured, so can or otherwise abandon this luminous energy emptying.Remaining light (being represented by arrow B) is advanced to reflection termination 19 as described above, yet the optical loss of making an appointment with half is in polarizer 12.When light from the reflection termination 19 when returning, the loss when it experiences once more and passes polarizer 12 as it.For illustrative purposes, suppose that modulator 14 is designed to current sensor is biased to orthogonal points (as described below), then the intrinsic light loss relevant with polarizer 12 will be about half of the light that passes polarizer 12 once more on return path.Remaining light is once more in the coupled into optical fibres 24, causes a part of light (being represented by arrow C) to march to detector 20 and another part (D represents by arrow) continues to propagate to light source 10.Therefore, consider inherent loss, ten sixths of only having an appointment in the luminous energy by light source 10 generations in fact at first are back to detector 20.
Therefore, expectation provides such optical current sensor, wherein, the optical loss of this sensor reduces, number of components still less and manufacturing cost lower.
Summary of the invention
According to an exemplary embodiment of the present invention, a kind of method of fiber-optic current sensor device current sensor of utilizing may further comprise the steps: make described light source light carry out polarization by making light source light pass polarising beam splitter; First bias phase shift is introduced into the circular polarization of light component waves that receives from described polarising beam splitter; Described polarized component ripple is converted to the linear polarization component waves from described circular component ripple; Make described linear polarization component waves pass polarization maintaining optical fibre; Described linear polarization component waves is changed back the circular component ripple; Described circular component ripple is introduced in second phase shift relevant with electric current; Described light is returned along the reverse path of described fiber-optic current sensor device, thereby will the third phase relevant move and the 4th bias phase shift is introduced described circularly polarized wave with described electric current; And the one way ports of the described electric current that returns by described polarising beam splitter be directed to detector, with the described electric current of sensing.
According to another illustrative embodiments of the present invention, a kind of fibre optic current sensor comprises: light source; Be connected to the polarising beam splitter of described light source, it has reciprocity port (reciprocalport) and one way ports; Be connected to the Faraday rotator of described polarising beam splitter; Be connected to first quarter-wave plate of described Faraday rotator; Be connected to the polarization maintaining optical fibre of described first quarter-wave plate; Be connected to second quarter-wave plate of described polarization maintaining optical fibre; Be connected to the sensor fibre of described second quarter-wave plate; And detector, it is connected to described polarising beam splitter and has output by described one way ports.
Description of drawings
Accompanying drawing shows illustrative embodiments of the present invention, wherein:
Fig. 1 shows traditional fibre optic current sensor;
Fig. 2 shows fibre optic current sensor according to an illustrative embodiment of the invention;
Fig. 3 is an intensity map, and described intensity is the function that enters the phase place of the light in the detector of traditional fiber current sensor of Fig. 1;
Fig. 4 is an intensity map, and described intensity is the function that enters the phase place of the light in the detector of traditional fiber current sensor according to an illustrative embodiment of the invention, Fig. 2;
Fig. 5 shows the calcspar of closed control circuit according to an illustrative embodiment of the invention; And
Fig. 6 shows the process flow diagram of the method for employing fibre optic current sensor current sensor according to an illustrative embodiment of the invention.
Embodiment
Describe the present invention in detail hereinafter with reference to accompanying drawing.In different accompanying drawings, identical label is represented same or analogous element.In addition, the following detailed description and unrestricted the present invention.Yet scope of the present invention is defined by the claims.
According to an illustrative embodiment of the invention, by using polarising beam splitter light is being led and between the light return period it led to detector to the reflection termination during the forward-propagating, to reduce the optical loss in the fibre optic current sensor.As will be described hereinafter, the fibre optic current sensor of application polarising beam splitter also has other advantage and benefit.
Embodiment is shown in Figure 2.Wherein, light source 50 (for example, super-radiance light emitting diode (SLED)) emission has the light of random polarization state, and this optically-coupled is advanced in single mode (SM) optical fiber 51.Alternatively, light carries out depolarization by depolariser 52, and half has the light of first linear polarization approximately so that comprise from the polarization state of light of depolariser 52 output, and remaining has the light with second linear polarization of the first linear polarization quadrature.
Depolarized light marches to polarising beam splitter (PBS) 54, and it enters polarising beam splitter (PBS) 54 by port 55.Polarising beam splitter 54 work is being two orthogonal polarization components with the depolarized light beam splitting.A polarized component (being represented by arrow A) is also being installed inscattering (although some light may pass through port 55 reflected backs) substantially from the beam splitting node reflected back in the PBS 54, and another polarized component (being represented by arrow B) is by port 57 transmission of PBS.Therefore, on the forward-propagating direction (promptly from light source 50 to the reflection termination 56), PBS 54 is sent to Faraday rotator 58 as polarizer work so that will have the light of single linear polarization.
The linearly polarized light that is incident on the Faraday rotator 58 can be regarded two basic circular component ripples that equate, for example dextrorotation circle (RHC) polarized component ripple and left-handed circle (LRC) polarized component ripple as.As will be hereinafter with reference to Fig. 3 described in detail like that, in order to improve the sensitivity of detector to the magnitude of current that flows through lead 59, Faraday rotator 58 work are setovered with no seedbed introducing between RHC component waves and LHC component waves.In an exemplary embodiment of the present invention embodiment, among 58 couples of RHC of Faraday rotator and the LHC one phase shift of introducing+22.5 degree, and among RHC and the LHC another introduced the phase shifts of-22.5 degree.Then, the luminous energy of biasing outputs to quarter-wave plate (λ/4) 60, and quarter-wave plate 60 is worked as mode converter, so that circularly polarized light is converted to linearly polarized light.
(PM) optical fiber 61 is sent to another quarter-wave plate 62 to linearly polarized light through protecting partially then, and quarter-wave plate 62 is worked as mode converter, so that linearly polarized light is changed back circularly polarized light.Quarter-wave plate 60, PM optical fiber 61 and quarter-wave plate 62 are set to a mechanism, to help to keep polarization state of light (more importantly being the relative phase shift between polarized component), this is because detector 64 work surveying this phase shift, and determines to flow through the size of current of conductor 59 according to this phase in-migration.Depend on the embodiment according to fibre optic current sensor of the present invention, PM optical fiber 61 can have any length from one or two meter to hundreds of rice, is useful to the polarization state and the phase shift information that keep described component on this length.Because magnetic and pressure influence that linear polarization is degenerated to the polarization state purity of the component waves that is easy to make light are insensitive, so linear polarization is used to transmit light in the system in this section.
After quarter-wave plate 62 outputs, it enters sensor fibre 66 at circularly polarized light, and sensor fibre 66 is around the monitored lead 59 of its electric current.When circular polarization state was kept well in whole sensor fibre 66, detector 64 also reached its peak response.As described in the ' No. 811 patents, reverse birefringence fiber and can keep circular polarization state to a certain extent.Yet, for some illustrative embodiments of the present invention, can expect that circular polarization state is kept well, so that can use length to grow very much the sensor fibre of (hundreds of rice).
Discuss in background technology part like that, according to ΔΦ=VNI, the electric current that flows through conductor 59 will be introduced extra phase shift between the RHC of the light that passes sensor fibre 66 and LHC polarized component ripple, and accumulative total is 2VNI.Light will arrive reflection termination 56 (for example mirror) then, and 56 place's light reflect back into quarter-wave plate 62 by sensor fibre 66 in the reflection termination.During passing through the backpropagation of sensor fibre 66, the RHC of light and LHC polarized component ripple will obtain the second phase shift 2VNI between them, amount to 4VNI when passing for twice.Because RHC and LHC polarized component wave polarization sensing take place when the incident of reflection termination oppositely, and on reverse path, light is the magnetic field through being produced by the electric current that passes conductor 59 in the opposite direction, so this second phase shift will be totally to first phase shift (but not with its counteracting).
For the backstroke by PM optical fiber 61, it is linearly polarized light that light will be changed back by quarter-wave plate 62, and is converted to circularly polarized light by quarter-wave plate 60 again.Light will carry out phase shift once more by Faraday rotator 58, so that the cumulative phase shift of introducing between RHC and LHC polarized component ripple is 90 degree+4VNI.March to PBS 54 then from the light of Faraday rotator 58 outputs.To have such polarization state from some part of the light of Faraday rotator 58 output (quantity depends on the cumulative phase shift of introducing along forward and reverse path), that is, this polarization state makes light derive (shown in the arrow C Fig. 2) from the approach axes reflection of Faraday rotator 58 and by the port 65 of PBS 54 to detector 64.Remaining light will be by PBS 54 port 55 pass (shown in the arrow D among Fig. 2) back and can isolate as required or emptying to light source 50.In context, because the light of being represented by arrow C leaves PBS 54 by different ports on its return path, rather than by its port that when forward path enters PBS54, is passed through (port 55), so port 65 is PBS 54 " one way ports ".On the contrary, the back light part of being represented by arrow D is left PBS 54 by reciprocity port 55.Illustrative embodiments of the present invention is surveyed the light intensity that returns by the one way ports of polarising beam splitter.
As mentioned above, detector 64 produces intensity datas, determines to be back to phase shift between the polarisation of light component waves of detector 64 by reverse travel path according to this intensity data.This phase shift will with pass the current related of conductor 59, therefore and can be used for exporting associated current measurement value.For for example shown in Figure 1, comprise for the detector of operating in the fibre optic current sensor of coupling mechanism 11 and polarizer 12, by the light intensity of detector measurement follow, basic shown in the property is sinusoidal function as schematically shown in Figure 3.Incide light intensity on the detector as the function 100 of phase place and illustrate.Owing to lack the biasing of for example introducing by Faraday rotator or birefringence modulator, be incident on the light on the detector 20 phase change will zero circle enclose among a small circle in fluctuate.As shown in Figure 3, light intensity changes in the little phase range that zero circle encloses very littlely.Therefore, bias phase shift is introduced enough biasings, thereby the phase place of the light that is back to detector is moved in the scope around the sine function orthogonal points, and wherein steeper the and detector of the slope of function is to change is responsive mutually.
Consider the corresponding strength function 200 for the illustrative embodiments among Fig. 2 now, it covers in Fig. 4 on the function 100.In addition, the same with Fig. 3, Fig. 4 is schematically fully in sensing, and it is not the result that side circuit is measured, and is intended to illustrate the magnitude of the numerical difference between of fibre optic current sensor in Fig. 2, the optical loss that fibre optic current sensor experienced among Fig. 1.Wherein, can see and use polarising beam splitter because remove photo-coupler 11 and polarizer 12, so for identical light source, the peak strength of function 200 is about four times of peak strength of function 100.This provides several advantages for fibre optic current sensor according to an illustrative embodiment of the invention.At first, as shown in Figure 4, because in the phase range of the usable levels of Φ=90 degree+4VNI, the corresponding slope of the slope ratio function 100 of function 200 is steeper, so the intensity of detector 64 obtains increasing with respect to the intensity of detector 20.Alternatively, if think that the slope of function 100 provides enough detector sensitivities for given fiber-optic current sensor application, then light source 50 can be embodied as the light source that produces the lower light of intensity, for example more cheap light source.
A plurality of variants of above-mentioned illustrative embodiments and displacement can be expected.For example, detector 64 can be to be connected to open-loop signal processor with the similar mode of the mode shown in Fig. 1, and this open-loop signal processor is used for determining the electric current relevant with detected phase shift.Alternatively, (it shows the part according to the fibre optic current sensor of this embodiment) as shown in Figure 5, detector 64 can be connected to the closed-loop signal processor 250 of drive current generator 260, and current feedback circuit 260 produces the zero phase electric current.The zero phase electric current will be offset by the reciprocal phase shift that the electric current in the current carrying conductor 59 produces substantially.Another variant is that Faraday rotator 58 and quarter-wave plate 60 can be replaced by birefringence modulator and delay winding.Yet the advantage of aforementioned combination is that it is passive device and does not therefore need power supply. Optical element 54,58 and 60 can be used as that individual unit is packaged together or can implement discretely.In addition, if the Faraday rotator of fibre optic current sensor partly is arranged near the conductor 59, then for example the protection thing of conductor loop can be arranged near the Faraday rotator 58, so that Faraday rotator avoids being exposed in the potential big magnetic field.
The correlation method of use Fibre Optical Sensor current sensor illustrates by the process flow diagram of Fig. 6.Wherein, in step 300, make its linear polarization by making light pass PBS.In step 302, the circular component ripple is setovered to introduce first phase shift between this component waves by for example Faraday rotator.In step 304, circularly polarized wave is converted to linearly polarized wave, make it pass polarization maintaining optical fibre (306), in step 308, convert it back to circularly polarized wave then.In step 310,, thereby between circularly polarized wave, introduce second phase shift because electric current flows through lead 59.In step 312, light is propagated along reverse path, therefore introduces third and fourth phase shift (relevant with the electric current that flows through lead 59 and bias unit respectively) therein.Then, in step 314, light is back to PBS, and at the PBS place, described light is directed to detector by the one way ports of PBS.Alternatively, can before step 300, carry out depolarization to light.
As mentioned above, illustrative embodiments of the present invention can be used birefringence modulator and substitute Faraday rotator so that the biasing of expectation to be provided.In this embodiment, because birefringence modulator operates linearly polarized light, so quarter-wave plate 60 can omit.
Above-mentioned illustrative embodiments is intended to all aspect explanation the present invention, and unrestricted.Therefore, the present invention can carry out multiple change in detailed enforcement, and those skilled in the art can obtain this change from the description that is included in herein.These all changes and modification are all thought within the present invention is by following claim restricted portion and spirit.Unless describe clearly, otherwise the element that uses in the application's the instructions, behavior or indication should not regard required in this invention or necessary as.In addition, as used herein such, article " (1) " is intended to comprise one or multinomial.
Claims (14)
1. method of utilizing fiber-optic current sensor device current sensor may further comprise the steps:
Make described light source light carry out polarization by making light source light pass polarising beam splitter;
First bias phase shift is introduced into the circular polarization of light component waves that receives from described polarising beam splitter;
Described circular component ripple is converted to the linear polarization component waves;
Make described linear polarization component waves pass polarization maintaining optical fibre;
Described linear polarization component waves is changed back the circular component ripple;
Described circular component ripple is introduced in second phase shift relevant with electric current;
Described light is returned along the reverse path of described fiber-optic current sensor device, thereby will the third phase relevant move and the 4th bias phase shift is introduced described circularly polarized wave with described electric current; And
The one way ports of the described electric current that returns by described polarising beam splitter is directed to detector, with the described electric current of sensing.
2. the method for claim 1 further may further comprise the steps:
Before the step that makes described light source light polarization, described light source light is carried out depolarization.
3. the method for claim 1, the step of wherein said introducing first bias phase shift further may further comprise the steps:
Make the light that receives from described polarising beam splitter pass through Faraday rotator.
4. the method for claim 1, the step that second phase shift that wherein will be relevant with described electric current is introduced into the described polarized component of described light further may further comprise the steps:
Make described light by sensor fibre, described sensor fibre is around the conductor of carrying described electric current, and wherein, the magnetic field relevant with described electric current is introduced into described second phase shift described polarized component of described light.
5. fibre optic current sensor comprises:
Light source;
Polarising beam splitter is connected to described light source and has reciprocity port and one way ports;
Faraday rotator is connected to described polarising beam splitter;
First quarter-wave plate is connected to described Faraday rotator;
Polarization maintaining optical fibre is connected to described first quarter-wave plate;
Second quarter-wave plate is connected to described polarization maintaining optical fibre;
Sensor fibre is connected to described second quarter-wave plate; And
Detector, it is connected to described polarising beam splitter and has output by described one way ports.
6. fibre optic current sensor as claimed in claim 5, wherein said polarising beam splitter is operated the light of advancing along forward path orientating reflex terminal, so that the light that receives from described light source carries out polarization, and the light of advancing towards described detector along reverse path is operated, described light is directed to described detector by described one way ports.
7. fibre optic current sensor as claimed in claim 5 further comprises the depolariser that is arranged between described light source and the described polarising beam splitter.
8. fibre optic current sensor as claimed in claim 5, wherein said polarising beam splitter, described Faraday rotator and described first quarter-wave plate are packaged together.
9. fibre optic current sensor as claimed in claim 5, wherein said light source is connected by single-mode fiber with described polarising beam splitter.
10. fibre optic current sensor as claimed in claim 5, wherein said Faraday rotator has shielding, and the contiguous described Faraday rotator of described shielding is so that described Faraday rotator is avoided influence of magnetic field.
11. a fibre optic current sensor comprises:
Light source;
Polarising beam splitter is connected to described light source, and has reciprocity port and one way ports;
Birefringence modulator is connected to described polarising beam splitter;
Polarization maintaining optical fibre is connected to described birefringence modulator;
Quarter-wave plate is connected to described polarization maintaining optical fibre;
Sensor fibre is connected to described quarter-wave plate; And
Detector, it is connected to described polarising beam splitter and has output by described one way ports.
12. fibre optic current sensor as claimed in claim 11, wherein said polarising beam splitter is operated the light of advancing along forward path orientating reflex terminal, so that the light that receives from described light source carries out polarization, and the light of advancing towards described detector along reverse path is operated, described light is directed to described detector by described one way ports.
13. fibre optic current sensor as claimed in claim 11 further comprises the depolariser that is arranged between described light source and the described polarising beam splitter.
14. fibre optic current sensor as claimed in claim 11, wherein said light source is connected by single-mode fiber with described polarising beam splitter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200510043322 DE102005043322B4 (en) | 2005-09-12 | 2005-09-12 | Fiber optic current sensor |
| DE102005043322.7 | 2005-09-12 | ||
| PCT/US2006/035256 WO2007033057A2 (en) | 2005-09-12 | 2006-09-11 | Fiber optic current sensor |
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| Publication Number | Publication Date |
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| CN101351714A true CN101351714A (en) | 2009-01-21 |
| CN101351714B CN101351714B (en) | 2011-11-23 |
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| CN2006800334699A Active CN101351714B (en) | 2005-09-12 | 2006-09-11 | Fiber optic current sensor |
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| CN (1) | CN101351714B (en) |
| DE (1) | DE102005043322B4 (en) |
| WO (1) | WO2007033057A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954827A (en) * | 2014-04-03 | 2014-07-30 | 易能乾元（北京）电力科技有限公司 | Optical current sensor |
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|---|---|---|---|---|
| US8890508B2 (en) | 2007-05-04 | 2014-11-18 | Alstom Technology Ltd | Adaptive filters for fiber optic sensors |
| DE102007057897B4 (en) * | 2007-11-29 | 2010-09-02 | Eads Deutschland Gmbh | Position indicating proximity sensor |
| CN102156213A (en) * | 2011-03-24 | 2011-08-17 | 东北大学 | Fiber bragg grating current measurement method based on birefrigent effect |
| CN102353833B (en) * | 2011-07-08 | 2014-03-05 | 福建师范大学 | Annular cavity all-fiber current sensor capability of eliminating temperature sensitivity |
| CN102426280B (en) * | 2011-10-19 | 2013-07-17 | 上海大学 | Reflection-type Sagnac interference fiber current sensor |
| CN102650524B (en) * | 2012-04-25 | 2014-10-15 | 北京航空航天大学 | Differential dual-interference type closed loop fiber optic gyroscope based on birefringence modulation of wide frequency light source |
| DE102012104348A1 (en) | 2012-05-21 | 2013-11-21 | Konrad Slanec | Contactless current sensor system for measuring electric current flowing in current conductor, has ferromagnetic core portions arranged so that two air gaps are formed such that magnetic field sensors are arranged in each air-gaps |
| CN113138302B (en) * | 2020-01-20 | 2023-02-14 | 南京南瑞继保电气有限公司 | Optical current transformer |
| JPWO2022210313A1 (en) * | 2021-03-30 | 2022-10-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4671658A (en) * | 1981-09-30 | 1987-06-09 | The Board Of Trustees Of The Leland Stanford Junior University | Fiber optic rotation sensor utilizing a magnetic shield and an optical isolator |
| US5644397A (en) * | 1994-10-07 | 1997-07-01 | The Texas A&M University System | Fiber optic interferometric circuit and magnetic field sensor |
| US5696858A (en) * | 1996-08-01 | 1997-12-09 | The Texas A&M University System | Fiber Optics apparatus and method for accurate current sensing |
| US6023331A (en) * | 1997-06-19 | 2000-02-08 | The Texas A&M University System | Fiber optic interferometric sensor and method by adding controlled amounts of circular birefringence in the sensing fiber |
| US6574015B1 (en) * | 1998-05-19 | 2003-06-03 | Seagate Technology Llc | Optical depolarizer |
| US6188811B1 (en) * | 1998-10-31 | 2001-02-13 | The Texas A&M Universtiy System | Fiber optic current sensor |
| US6301400B1 (en) * | 1998-11-12 | 2001-10-09 | Nxtphase Technologies Srl | Fiber optic current sensor having rotation immunity |
| US6535654B1 (en) * | 1998-12-29 | 2003-03-18 | Nxtphase Technologies, Srl | Method for fabrication of an all fiber polarization retardation device |
| US6891622B2 (en) * | 1999-02-11 | 2005-05-10 | Kvh Industries, Inc. | Current sensor |
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2005
- 2005-09-12 DE DE200510043322 patent/DE102005043322B4/en active Active
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- 2006-09-11 CN CN2006800334699A patent/CN101351714B/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954827A (en) * | 2014-04-03 | 2014-07-30 | 易能乾元（北京）电力科技有限公司 | Optical current sensor |
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| Publication number | Publication date |
|---|---|
| WO2007033057A2 (en) | 2007-03-22 |
| DE102005043322A1 (en) | 2007-03-15 |
| WO2007033057A3 (en) | 2008-07-31 |
| CN101351714B (en) | 2011-11-23 |
| DE102005043322B4 (en) | 2015-03-19 |
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