CN113933559B - Optical fiber current sensor - Google Patents
Optical fiber current sensor Download PDFInfo
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- CN113933559B CN113933559B CN202111536160.4A CN202111536160A CN113933559B CN 113933559 B CN113933559 B CN 113933559B CN 202111536160 A CN202111536160 A CN 202111536160A CN 113933559 B CN113933559 B CN 113933559B
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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
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- 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
Abstract
The present invention provides an optical fiber current sensor, comprising: the sensing ring comprises a sensing optical fiber and a reflecting component connected with the sensing optical fiber, wherein the sensing optical fiber is connected with a first connector; the collector comprises a polarization maintaining optical fiber delay line and a collecting assembly connected with the polarization maintaining optical fiber delay line, and the polarization maintaining optical fiber delay line is connected with a second connector; and the first optical connector is positioned between the sensing ring and the collector, is provided with a first connecting end and a second connecting end which are mutually connected and can conduct light waves, and the first joint of the sensing optical fiber and the second joint of the polarization maintaining optical fiber delay line are respectively detachably connected with the first connecting end and the second connecting end of the optical connector, so that the detachable connection between the sensing ring and the collector is realized. The optical fiber current sensor can repeatedly disassemble and assemble the sensing ring and the collector, and has excellent measurement precision.
Description
Technical Field
The invention relates to the technical field of current measurement, in particular to an optical fiber current sensor.
Background
The all-fiber current sensor has the advantages of strong anti-interference capability, high measurement precision, large dynamic range, high response speed, capability of simultaneously measuring alternating current and direct current signals, easiness in integration and the like, the optical fiber has excellent insulating property, and the sensor adopts non-intrusive measurement and cannot generate additional influence on a tested current circuit. The current all-fiber current sensor, as shown in fig. 1, generally comprises a light source, a coupler (circulator), an optical fiber polarizer, a phase modulator, a polarization maintaining optical fiber delay loop, a transmission optical fiber, an optical fiber wave plate, an optical fiber with a reflector, a photodetector, and a signal processing unit, where the above components form a sensing loop and a collector, and the mounting modes between the sensing loop and the collector of a target are divided into two types: one is fixed installation, and the other is flexible installation; however, the sensing ring and the collector cannot be separated, when the position of the sensing ring or the position of the sensing ring and the collector need to be moved, the space and the length of the transmission optical fiber are limited, and if the sensing ring and the collector are disconnected, special polarization-maintaining fusion equipment needs to be used for carrying out optical fiber fusion, so that the connection mode is complicated, and the optical fiber fusion device is not easy to apply to engineering sites. Therefore, in order to conveniently install and replace the optical path and the structural part of the optical fiber current sensor on the engineering site, the optical fiber current sensor which can ensure the accuracy of the sensor and is convenient for the repeated disassembly and assembly of the collector and the sensing ring is urgently needed.
Disclosure of Invention
The invention provides an optical fiber current sensor which can be used for repeatedly disassembling and assembling a sensing ring and a collector and has excellent measurement precision.
The present invention provides an optical fiber current sensor, comprising:
the sensing ring comprises a sensing optical fiber and a reflecting component connected with the sensing optical fiber, wherein the sensing optical fiber is connected with a first connector;
the collector comprises a polarization maintaining optical fiber delay line and a collecting assembly connected with the polarization maintaining optical fiber delay line, and the polarization maintaining optical fiber delay line is connected with a second connector; and
the first optical connector is positioned between the sensing ring and the collector, is provided with a first connecting end and a second connecting end which are mutually connected and can conduct light waves, and the first joint of the sensing optical fiber and the second joint of the polarization maintaining optical fiber delay line are detachably connected with the first connecting end and the second connecting end of the optical connector respectively, so that the detachable connection between the sensing ring and the collector is realized.
As an optional embodiment, the sensing optical fiber is a round-protection optical fiber jumper, and the first connection head is formed by a jumper head of the round-protection optical fiber jumper.
As an optional embodiment, the polarization-maintaining fiber delay line includes a polarization-maintaining transmission fiber and a polarization-maintaining fiber delay loop, the collector further includes a fiber wave plate assembly, and the second joint is formed by the fiber wave plate assembly.
As an optional embodiment, the optical fiber wave plate assembly includes an optical fiber wave plate and a round-protecting optical fiber jumper connected to the optical fiber wave plate, and a jumper head of the round-protecting optical fiber jumper is connected to the second connection end of the first optical connector.
As an alternative embodiment, the first connection end and the second connection end in the optical connector are both formed by optical fiber connectors, and the first connection end and the second connection end are connected by an optical fiber flange.
As an optional embodiment, the sensing optical fiber includes two first connectors, the reflection component includes a reflector, a round-protection optical fiber jumper connected to the reflector, and a second optical connector connected to the round-protection optical fiber jumper, and the two first connectors of the sensing optical fiber are respectively connected to the first optical connector and the second optical connector.
As an optional embodiment, the round-keeping optical fiber patch cord is a high birefringence rotating optical fiber patch cord.
As an optional embodiment, the collecting assembly includes a light source, an optical fiber coupler, and an optical fiber polarizer assembly connected by the polarization-maintaining optical fiber delay line, the optical fiber wave plate is located on the polarization-maintaining optical fiber delay line between the optical fiber delay loop and the first optical connector, and the sensing optical fiber at least surrounds in an arc shape, so that the reflecting assembly is disposed adjacent to the optical fiber wave plate.
As an optional embodiment, the acquisition assembly further includes a photodetector connected to the optical fiber coupler, and a signal processing unit connected to the photodetector, and the signal processing unit is connected to an external signal receiving terminal and configured to output a processing result.
As an optional embodiment, the signal processing unit is connected to the optical fiber polarization adjusting assembly at the same time, and is configured to feed back a processing result and modulation information to the optical fiber polarization adjusting assembly, where the optical fiber polarization adjusting assembly includes an optical fiber polarizer and a phase modulating device.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a fiber optic current sensor in the prior art.
Fig. 2 is a schematic structural diagram of an optical fiber current sensor in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a fiber optic current sensor according to another embodiment of the present invention.
Fig. 4 is a schematic partial structural view of a fiber optic current sensor according to another embodiment of the present invention.
Fig. 5 is a schematic view of a part of a fiber optic current sensor according to another embodiment of the present invention.
Fig. 6 is a schematic partial structural view of a fiber optic current sensor according to another embodiment of the present invention.
Reference numerals:
1-a light source; 2-a fiber optic coupler; 3-an optical fiber polarization adjusting component; 4-polarization maintaining optical fiber delay line; 5-an optical fiber wave plate assembly; 6-a first optical connector; 7-sensing optical fiber; 8-current carrying bus; 9-a sensing loop; 10-a reflective component; 11-polarization maintaining transmission fiber; 12-a signal processing unit; 13-a photodetector; 14-a collector; 16-a fiber optic wave plate; 17-a mirror; 18-a second optical connector; 19-a first joint; 20-a round fiber jumper; 21-second linker.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
It will be understood that various modifications may be made to the embodiments disclosed herein. The following description is, therefore, not to be taken in a limiting sense, and is made merely as an exemplification of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the attached drawings.
It should also be understood that, although the invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the invention, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
The phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," as used herein, may each refer to one or more of the same or different embodiments in accordance with the present disclosure.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of an optical fiber current sensor in an embodiment of the present invention, and fig. 3 is a schematic structural diagram of an optical fiber current sensor in another embodiment of the present invention, as shown in fig. 2 and fig. 3, the optical fiber current sensor in the embodiment of the present invention includes:
the sensing ring 9 comprises a sensing optical fiber 7 and a reflecting component 10 connected with the sensing optical fiber 7, wherein a first connector 19 is connected to the sensing optical fiber 7;
the collector 14 comprises a polarization maintaining optical fiber delay line 4 and a collecting component connected with the polarization maintaining optical fiber delay line 4, and the polarization maintaining optical fiber delay line 4 is connected with a second joint 21; and
and the first optical connector 6 is positioned between the sensing ring 9 and the collector 14, is provided with a first connecting end and a second connecting end which are mutually connected and can conduct light waves, and the first joint 19 of the sensing optical fiber 7 and the second joint 21 of the polarization-maintaining optical fiber delay line 4 are respectively detachably connected with the first connecting end and the second connecting end of the optical connector, so that the detachable connection between the sensing ring 9 and the collector 14 is realized.
The optical fiber current sensor in the embodiment can be applied to the fields such as current measurement of metallurgical electrolytic cells. The optical fiber current sensor in this embodiment is provided with the optical connector, and the first joint 19 and the second joint 21 are respectively arranged on the sensing optical fiber 7 and the polarization maintaining optical fiber delay line 4 of the sensing ring 9 and the collector 14, so that the sensing ring 9 and the collector 14 are detachably connected, that is, a user can repeatedly detach and connect the sensing ring 9 and the collector 14 as required, so as to meet the requirement of detection operation. Through adopting above-mentioned mode of setting in this embodiment, no longer need use dedicated welding equipment to carry out the butt fusion between sensing ring 9 and collector 14, alright easily realize the dismouting between collector 14 and the sensing ring 9, greatly made things convenient for optic fibre current sensor's installation and use. In addition, the detection precision of the optical fiber current sensor cannot be reduced by adopting the connection method of the embodiment, the use threshold is low, and the optical connector can smoothly conduct the sensing optical fiber 7 and the polarization-maintaining optical fiber delay line 4, so that the transmission of light waves between the collector 14 and the sensing ring 9 can be effectively ensured, the effect of accurately sensing current based on light wave signals can be effectively realized by the optical fiber current sensor, and the stable performance of the optical fiber current sensor can be ensured.
Further, the sensing optical fiber 7 in this embodiment is a round-protection optical fiber jumper, and the first connector 19 is formed by a jumper head of the round-protection optical fiber jumper.
The polarization-maintaining optical fiber delay line 4 comprises a polarization-maintaining transmission optical fiber 11 and a polarization-maintaining optical fiber delay loop, the collector 14 further comprises an optical fiber wave plate component 5, and the second joint 21 is formed by the optical fiber wave plate component 5.
Specifically, as shown in fig. 4, the optical fiber wave plate assembly 5 in the present embodiment includes an optical fiber wave plate 16 and a round-off optical fiber jumper 20 connected to the optical fiber wave plate 16, and a jumper head of the round-off optical fiber jumper 20 is connected to the second connection end of the first optical connector 6. That is, the jumper tab in the fiber optic waveplate assembly 5 forms the second tab 21 for connection to the second connection end of the first optical connector 6. After the light waves are output by the collecting component in the collector 14, the light waves are input into the sensing ring 9 through the polarization maintaining optical fiber delay line 4, the optical fiber wave plate 16, the round maintaining optical fiber jumper and the first optical connector 6. That is, as shown in fig. 4, one end of the optical fiber wave plate 16 is connected to the polarization maintaining transmission fiber 11, and the other end is connected to the round fiber jumper 20, and the jumper head at the end of the round fiber jumper 20 forms the second connector 21.
The ground round-protection optical fiber jumper 20 is an optical fiber jumper manufactured by round-protection optical fibers, and can be applied to various jumper heads, such as an SC head, an FC head, an E2000 head, and the like.
Further, the sensing fiber used in the sensing ring 9 of the fiber optic current sensor is usually a special fiber, and the currently mainstream sensing fiber, such as the above-mentioned round-robin fiber, is usually a low-birefringence single-mode fiber. The low birefringence fiber adopts a fiber jumper mode, and is commonly a single mode fiber jumper. However, if the low-birefringence single-mode fiber is used in the optical fiber current sensor in the embodiment in a butt-joint mode in an optical fiber jumper manner, the low-birefringence single-mode fiber has poor interference resistance, which not only causes unstable polarization state of light, but also introduces extra loss, and cannot ensure the precision of the optical fiber current sensor. Therefore, in order to ensure the stability of the polarization state of light and the accuracy of the optical fiber current sensor, the round-robin optical fiber jumpers 20 in the present embodiment are all high-birefringence rotating optical fiber jumpers. The high birefringence rotating optical fiber is also used in an optical fiber current sensor in a butt joint mode in an optical fiber jumper way, and the high birefringence rotating optical fiber is made into the optical fiber jumper in the jumper joint mode, so that the polarization state and the phase difference of two beams of circularly polarized light in the optical fiber cannot be damaged. Compared with the performance of the traditional optical fiber current sensor, the optical fiber current sensor prepared based on the high-birefringence rotating optical fiber jumper wire butt joint mode may increase the temperature error in the optical fiber sensor. Therefore, in order to cancel out the temperature error, a structure for performing temperature compensation to correct the temperature error is provided in the optical fiber current sensor in this embodiment, and the structure is not unique, and can be implemented according to actual needs by using the prior art. Compare and adopt low birefringence single mode fiber as the circle-protecting fiber, the circle-protecting fiber of wire jumper form is made into to this embodiment adoption high birefringence rotatory optic fibre, not only can be stable with the butt joint of optical connector, can effectively guarantee fiber current sensor's measurement accuracy moreover. In addition, the round-protecting optical fiber jumper wire is manufactured by adopting the high-birefringence rotary optical fiber and the optical fiber connector, and the shaft alignment is not needed during manufacturing and connection, so that the shaft angle difference is avoided, the process difficulty is greatly reduced, the preparation cost is reduced, and the batch production is facilitated.
Further, in the first optical connector 6 of the present embodiment, the first connection end and the second connection end are formed by optical fiber connectors. The optical fiber connector is matched with the jumper wire head structures of the sensing optical fiber 7 and the polarization maintaining optical fiber delay line 4 so as to be used for successful connection and light path conduction. The first connecting end and the second connecting end are connected through an optical fiber flange, and when the sensing ring 9 and the collector 14 are to be disassembled, the optical fiber connector is only required to be pulled out from the optical fiber flange.
Further, as shown in fig. 2, the reflection assembly 10 of the present embodiment may be fixedly connected to the sensing fiber 7, only a portion of the reflection assembly 10 may be fixed to the sensing fiber 7, or as shown in fig. 3, the reflection assembly 10 and the sensing fiber 7 may be detachably connected.
Specifically, as shown in fig. 3, 5 and 6, the sensing fiber 7 in the present embodiment includes two first connectors 19, that is, two ends of the round fiber jumper used for forming the sensing fiber 7 are provided with jumper terminals. The reflection assembly 10 comprises a reflector 17, a round fiber jumper 20 connected with the reflector 17, and a second optical connector 18 connected with the round fiber jumper 20, wherein the reflector 17 is arranged at the tail end of the round fiber jumper 20, and the head end of the round fiber jumper 20 is provided with a jumper head. The two first splices 19 of the sensing fiber 7 are connected to the first optical connector 6 and the second optical connector 18, respectively. Therefore, the reflection assembly 10 and the sensing optical fiber 7 can be detachably connected, and the subsequent use and maintenance of the optical fiber current sensor are facilitated. In addition, the round fiber jumper 20 in the reflection assembly 10 in this embodiment is still preferably a high birefringence rotary fiber jumper.
With reference to fig. 2 and fig. 3, the collecting component in this embodiment includes a light source 1, an optical fiber coupler 2, an optical fiber polarization adjusting component 3, and an optical fiber wave plate component 5, which are sequentially connected in series by a polarization-maintaining optical fiber delay line 4, and are located on the polarization-maintaining optical fiber delay line 4 between the optical fiber delay loop and the first optical connector 6. Wherein, the polarization maintaining optical fiber delay line 4 can be further provided with the polarization maintaining optical fiber delay line 4. Further, as shown in the accompanying drawings, the sensing optical fiber 7 at least encloses a circular arc, the current-carrying bus 8 passes through a circular arc region enclosed by the sensing optical fiber 7, and at this time, the two first connection terminals of the sensing optical fiber 7 are located on the same side of the current-carrying bus 8 and are connected with the optical fiber wave plate assembly 5 and the reflection assembly 10 respectively. In this embodiment, the optical fiber wave plate assembly 5 and the reflector 17 are adjacent to each other and can be infinitely close to each other, or the optical fiber wave plate assembly, the sensing optical fiber 7 and the reflector assembly 10 can be installed together in a same outer casing, such as a circular outer casing through which the current-carrying bus 8 passes. The scheme that the round-protection optical fiber jumper wire 20 with the optical fiber wave plate 16 is connected with the round-protection optical fiber jumper wire 20 forming the sensing optical fiber 7 and the round-protection optical fiber jumper wire 20 with the reflector 17 in sequence to form the sensing ring 9 comprising the optical fiber wave plate 16 can also realize the fixed closed installation between the optical fiber wave plate 16 and the reflector 17, so that when the sensing ring 9 and the collector 14 are disassembled and assembled at each time, the closed installation between the optical fiber wave plate 16 and the reflector 17 is not required again, and the steps and the difficulty of disassembling and assembling devices by workers are reduced.
Further, the acquisition assembly in this embodiment further includes a photodetector 13 connected to the optical fiber coupler 2, and a signal processing unit 12 connected to the photodetector 13, where the signal processing unit 12 is connected to an external signal receiving terminal, and is configured to output a processing result.
Optionally, the signal processing unit 12 is connected to the optical fiber polarization adjusting assembly 3 at the same time for feeding back the processing result and the modulation information to the optical fiber polarization adjusting assembly 3, where the optical fiber polarization adjusting assembly 3 includes an optical fiber polarizer and a phase modulation device.
The optical fiber current sensor in the embodiment can be applied to the measurement of the current of the metallurgical electrolytic bath, and the optical fiber current sensor in the embodiment can facilitate the detection operation of workers due to the characteristics that the metallurgical electrolytic bath has a plurality of measuring points, the installation space is narrow, the magnetic field interference is large, the temperature is high, the measured current position is away from the ground and the like. In specific implementation, the sensing ring 9 is pulled out of the collector 14, the sensing ring 9 is mounted on a measured object, and then the collector 14 is connected with the sensing ring 9 through the first optical connector 6; when the sensor is to be disassembled, for example, when the sensing ring 9 is disassembled from the measured object, the sensing ring 9 can be separated from the optical connector on the collector 14, and then the sensing ring 9 is disassembled, so that the process is simple and convenient.
Further, when the optical fiber current sensor in this embodiment is applied, light emitted from the light source 1 in the collector 14 is split by the coupler and then converted into linearly polarized light by the polarizer. The polarized linear light can be uniformly injected into the X axis (fast axis) and the Y axis (slow axis) of the polarization-maintaining fiber by welding the output tail fiber of the polarizer and the input tail fiber of the phase modulator at 45 degrees, when the two beams of orthogonal mode linear light pass through the fiber wave plate 16 of lambda ⁄ 4 at an included angle of 45 degrees, the two beams of orthogonal mode linear light are respectively converted into left-handed and right-handed circular polarized light, are coupled into the sensing fiber of the collector 14, are transmitted into the sensing ring 9 with the reflector 17 through the first optical connector 6, and are transmitted by the sensing fiber 7 in the sensing ring 9. In the sensing fiber 7, two circularly polarized light beams are transmitted at different speeds due to the magnetic field faraday effect generated by the current on the current carrying bus bar 8. When the two circularly polarized lights travel to the reflecting mirror 17 at the end of the sensing fiber 7, the two circularly polarized lights are reflected by the reflecting mirror 17, and the polarization mode interchange is completed while the reflection is performed, that is, the left-handed light becomes the right-handed light, and the right-handed light becomes the left-handed light. The reflected circularly polarized light passes through the sensing fiber 7 again and interacts with the magnetic field generated by the current again, so that the phase generated by the two beams of circularly polarized light is doubled, namely, the phase difference between the left-handed circularly polarized light and the right-handed circularly polarized light is doubled through the mode exchange. After the two beams of light pass through the optical fiber wave plate 16 again, the two beams of light are restored to linearly polarized light, the linearly polarized light which originally enters the optical fiber wave plate 16 along the X axis and the Y axis of the polarization maintaining optical fiber is emitted out of the wave plate along the Y axis and the X axis of the polarization maintaining optical fiber, namely, the propagation paths of the two beams of light are exchanged. Then, the two linearly polarized light beams interfere through the polarizer, are coupled into the detector, and are subjected to signal processing, feedback and output by the signal processing unit 12.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A fiber optic current sensor, comprising:
the sensing ring comprises a sensing optical fiber and a reflecting component connected with the sensing optical fiber, wherein the sensing optical fiber is connected with a first connector;
the collector comprises a polarization maintaining optical fiber delay line and a collecting assembly connected with the polarization maintaining optical fiber delay line, and the polarization maintaining optical fiber delay line is connected with a second connector; and
the first optical connector is positioned between the sensing ring and the collector, is provided with a first connecting end and a second connecting end which are mutually connected and can conduct light waves, and a first joint of the sensing optical fiber and a second joint of the polarization maintaining optical fiber delay line are detachably connected with the first connecting end and the second connecting end of the optical connector respectively so as to realize detachable connection between the sensing ring and the collector;
the sensing optical fiber is a round-protection optical fiber jumper wire, the first joint is formed by a jumper wire head of the round-protection optical fiber jumper wire, and the round-protection optical fiber jumper wire is a high-birefringence rotary optical fiber jumper wire;
the polarization-maintaining optical fiber delay line comprises polarization-maintaining transmission optical fibers and a polarization-maintaining optical fiber delay ring, the collector further comprises an optical fiber wave plate assembly, and the second joint is formed by the optical fiber wave plate assembly.
2. The fiber optic current sensor of claim 1, wherein the fiber optic waveplate assembly comprises a fiber optic waveplate and a round-off fiber jumper connected to the fiber optic waveplate, the jumper head of the round-off fiber jumper being connected to the second connection end of the first optical connector.
3. The fiber optic current sensor of claim 1, wherein the first and second connectors of the optical connector are formed by fiber optic connectors, and the first and second connectors are connected by fiber optic flanges.
4. The fiber optic current sensor of claim 1, wherein said sensing fiber comprises two of said first splices, and wherein said reflective assembly comprises a mirror, a rounded fiber jumper connected to said mirror, and a second optical connector connected to said rounded fiber jumper, and wherein said two of said first splices of said sensing fiber are connected to said first and second optical connectors, respectively.
5. The fiber optic current sensor of any of claims 2, 4, wherein the rounded optical fiber jumpers are high birefringence spun optical fiber jumpers.
6. The fiber optic current sensor of claim 2, wherein said collection assembly comprises a light source, a fiber coupler, and a fiber polarizer assembly sequentially connected in series by said polarization maintaining fiber delay line, said fiber wave plate is located on the polarization maintaining fiber delay line between said fiber delay loop and the first optical connector, and said sensing fiber is at least rounded so that said reflection assembly is disposed adjacent to said fiber wave plate.
7. The optical fiber current sensor according to claim 6, wherein the collection assembly further comprises a photodetector connected to the optical fiber coupler, and a signal processing unit connected to the photodetector, and the signal processing unit is connected to an external signal receiving terminal and configured to output a processing result.
8. The fiber optic current sensor of claim 7, wherein said signal processing unit is also coupled to said fiber optic polarizer assembly for feeding back processing results and modulation information to said fiber optic polarizer assembly, said fiber optic polarizer assembly including a fiber optic polarizer and a phase modulation device.
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| JP2006119497A (en) * | 2004-10-25 | 2006-05-11 | Furukawa Electric Co Ltd:The | Connector for optical fiber sensor |
| CN103280689B (en) * | 2013-05-29 | 2015-04-01 | 中国科学院半导体研究所 | Fiber laser outputting waves of different lengths |
| CN103869224A (en) * | 2014-03-03 | 2014-06-18 | 国家电网公司 | Capacitive equipment partial discharge detection method based on optical fiber current sensor |
| CN204154888U (en) * | 2014-07-28 | 2015-02-11 | 北京自动化控制设备研究所 | A kind of all-fiber current transformator sensing ring device for detecting performance |
| CN207396586U (en) * | 2017-11-07 | 2018-05-22 | 许继集团有限公司 | A kind of optical fiber current mutual inductor |
| 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 |
| CN211234773U (en) * | 2019-12-23 | 2020-08-11 | 苏州德睿电力科技有限公司 | FP chamber temperature sensor based on optic fibre wire jumper |
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