CN113295905A - Optical fiber current mutual inductance device based on chiral optical fiber coupler, optical fiber current mutual inductance system and working method of optical fiber current mutual inductance system - Google Patents
Optical fiber current mutual inductance device based on chiral optical fiber coupler, optical fiber current mutual inductance system and working method of optical fiber current mutual inductance system Download PDFInfo
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- CN113295905A CN113295905A CN202110470040.2A CN202110470040A CN113295905A CN 113295905 A CN113295905 A CN 113295905A CN 202110470040 A CN202110470040 A CN 202110470040A CN 113295905 A CN113295905 A CN 113295905A
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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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- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
- G02B6/272—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations comprising polarisation means for beam splitting and combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/276—Removing selected polarisation component of light, i.e. polarizers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
Abstract
The invention discloses an optical fiber current mutual inductance device based on a chiral optical fiber coupler, an optical fiber current mutual inductance system and a measuring method of the optical fiber current mutual inductance system. The SLD light source (1) and the photoelectric detector (2) are both linked with a 2 x 2 single-mode fiber coupler (3), the 2 x 2 single-mode fiber coupler (3) is connected with a straight waveguide phase modulator (5) through a polarizer (4), the photoelectric detector (2) is connected with a circuit signal processing module (9), and the circuit signal processing module (9) is respectively connected with a current output end (10) and the straight waveguide phase modulator (5); the straight waveguide phase modulator (5) is connected with the 1 x 2 chiral optical fiber coupler (7) through the optical fiber delay ring (6), the 1 x 2 chiral optical fiber coupler (7) is connected with the optical fiber sensing ring (8), and the current-carrying conductor (11) is embedded in the optical fiber sensing ring (8). The invention improves the temperature stability of the optical fiber current transformer system when measuring current.
Description
Technical Field
The invention belongs to the field of all-fiber current sensing; in particular to an optical fiber current mutual inductance device based on a chiral optical fiber coupler, an optical fiber current mutual inductance system and a working method thereof.
Background
An optical Fiber current transformer (FOCT) is an optical Fiber sensor based on faraday optical rotation effect, and is widely applied to the power transmission industry due to its advantages of good insulation, high reliability, wide frequency domain, good transient characteristics, etc. The FOCT optical path part is provided with a lambda/4 wave plate, an optical fiber sensing ring and a whole closed loop formed by a reflecting mirror at the tail end of the sensing ring, wherein the whole closed loop is used as a sensitive component of the FOCT. And the sensitive part is arranged on the high-voltage side and is easily influenced by the temperature of the external environment, so that the accuracy of the current measurement of the FOCT system is reduced, and further the further scale application of the FOCT system is limited, wherein the most influenced part is a lambda/4 wave plate. The lambda/4 wave plate has certain phase delay error and axis alignment error when being manufactured and welded with the tail fiber of the straight waveguide phase modulator, and in addition, the phase delay error of the lambda/4 wave plate can be influenced by the change of the external temperature, the factors can cause the polarization error of light in the transmission process of the FOCT system, and the accuracy of the current measurement of the system is further reduced.
Therefore, in order to reduce the influence of temperature variation on the FOCT measurement current, the polarization error caused by the lambda/4 wave plate needs to be compensated. The existing mainstream solutions include two solutions, one is to compensate the phase delay change of the lambda/4 wave plate caused by the temperature change by using the negative correlation change of the fiber sensing ring verdet constant influenced by the temperature, and the other is to compensate the polarization error caused by the temperature change by adding a temperature compensation algorithm in the FPGA chip of the circuit signal processing system, but both of the two solutions have certain defects. For the first scheme, the phase delay of the λ/4 wave plate needs to be adjusted to deviate from 90 degrees to compensate the change of the fiber sensing ring verdet constant, and although the requirement of the system for measuring the current accuracy under the condition of variable temperature can be met through parameter optimization, the accuracy of the system for measuring the current at normal temperature can be sacrificed; for the second scheme, because the overall error of the system is not linear change, the system measurement errors at a plurality of temperature points can be calibrated only, and the errors at other temperature points can be estimated only through the fitted curve, so that accurate and continuous real-time temperature compensation cannot be realized, and the problem is not solved fundamentally. Both of these schemes have disadvantages that limit the accuracy of the FOCT system in measuring current in variable temperature environments. Therefore, a solution capable of improving the temperature stability of the system in principle needs to be found.
Disclosure of Invention
The invention provides an optical fiber current mutual inductance device based on a chiral optical fiber coupler, an optical fiber current mutual inductance system and a working method of the optical fiber current mutual inductance device, and the optical fiber current mutual inductance system improves the temperature stability when measuring current.
The invention is realized by the following technical scheme:
an optical fiber current mutual inductance device based on a chiral optical fiber coupler comprises an SLD light source 1, a photoelectric detector 2, a 2 x 2 single-mode optical fiber coupler 3, a polarizer 4, a straight waveguide phase modulator 5, an optical fiber delay ring 6, a 1 x 2 chiral optical fiber coupler 7, an optical fiber sensing ring 8, a circuit signal processing module 9, a current output end 10 and a current-carrying conductor 11, wherein the SLD light source 1 and the photoelectric detector 2 are both linked with the 2 x 2 single-mode optical fiber coupler 3, the 2 x 2 single-mode optical fiber coupler 3 is connected with the straight waveguide phase modulator 5 through the polarizer 4,
the photoelectric detector 2 is connected with a circuit signal processing module 9, and the circuit signal processing module 9 is respectively connected with a current output end 10 and the straight waveguide phase modulator 5;
the straight waveguide phase modulator 5 is connected with a 1 x 2 chiral optical fiber coupler 7 through an optical fiber delay ring 6, the 1 x 2 chiral optical fiber coupler 7 is connected with an optical fiber sensing ring 8, and a current-carrying conductor 11 is embedded in the optical fiber sensing ring 8.
A fiber current mutual inductance system based on a chiral fiber coupler comprises a light source output end of an SLD light source 1, an input end of a single-mode fiber coupler 3, a left output end of the single-mode fiber coupler 3, an input end of a photoelectric detector 2, a right output end of the single-mode fiber coupler 3, an input end of a polarizer 4, an output end of the photoelectric detector 2, a signal receiving end of a circuit signal processing module 9, an output end of the polarizer 4, a left input end of a straight waveguide phase modulator 5, an output end of the straight waveguide phase modulator 5, an input end of a fiber delay ring 6, an output end of the fiber delay ring 6, an input end of a 1 x 2 chiral fiber coupler 7, the chiral optical fiber 12 and the chiral optical fiber 13 which form the output end of the 1 × 2 chiral optical fiber coupler 7 are respectively connected with two ends of the optical fiber sensing ring 8 to form a closed loop, the output end of the circuit signal processing module 9 is connected to the input end below the straight waveguide phase modulator 5 through a lead, and the current-carrying conductor 11 is wound at the central position of the optical fiber sensing ring.
Further, the 1 × 2 chiral fiber coupler 7 includes a chiral fiber i 12 and a chiral fiber ii 13, where a distance between the chiral fiber i 12 and the chiral fiber ii 13 is d, and a coupling length is L.
Furthermore, the materials of the chiral optical fiber I12 and the chiral optical fiber II 13 are polymethyl methacrylate doped with griseofulvin.
A working method of an optical fiber current mutual inductance system based on a chiral optical fiber coupler is characterized in that a natural light beam emitted by an SLD light source 1 enters a polarizer 4 through a single-mode optical fiber coupler 3, the natural light beam passes through the polarizer 4 and is converted into a linearly polarized light beam, the linearly polarized light beam passes through a straight waveguide phase modulator 5 and an optical fiber delay ring 6 and reaches a 1 x 2 chiral optical fiber coupler 7, the linearly polarized light beam is decomposed into a levorotatory base mode light beam and a dextrorotatory base mode light beam which are equal in size, the dextrorotatory base mode light beam is transmitted from a cladding of a chiral optical fiber 12 by a distance d and then leaks into the cladding of the chiral optical fiber 13, and then enters a fiber core of the chiral optical fiber 13 after passing through a coupling length L; the left-handed fundamental mode light beams are transmitted in the fiber core of the chiral optical fiber 12, and finally the two kinds of light beams in the rotational directions respectively enter the two ends of the optical fiber sensing ring 8;
when a current-carrying conductor 11 passes through current, a Faraday optical rotation effect can be generated in the optical fiber sensing ring 8, both a left-handed base mode light beam and a right-handed base mode light beam in the optical fiber sensing ring 8 carry Faraday optical rotation information, the left-handed base mode light beam and the right-handed base mode light beam return to the 1X 2 chiral optical fiber coupler 7 through a chiral optical fiber 12 and a chiral optical fiber 13, the left-handed base mode light beam and the right-handed base mode light beam pass through an optical fiber delay ring 6 and a straight waveguide phase modulator 5 and then interfere at a polarizer 4, an interfered optical signal passes through a single-mode optical fiber coupler 3 and then reaches a photoelectric detector 2, the photoelectric detector 2 converts the received optical signal into an electric signal, and finally the electric signal is sent to a circuit signal processing module 9 for processing and then outputs a measured current value in a digital quantity form at a position 10, and meanwhile, the circuit signal processing module 9 feeds back the input digital quantity to the straight waveguide phase modulator 5 for signal modulation and demodulation, therefore, the whole FOCT system forms a closed loop to complete the transmission of signals.
The invention has the beneficial effects that:
the structure of the invention replaces the original reflection type structure, not only the insensitivity to temperature is realized, but also the method of the invention eliminates the counter shaft error and the phase delay error introduced by the lambda/4 wave plate, and ensures the accuracy of FOCT measuring current at normal temperature.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the internal structure of the chiral optical fiber coupler of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An optical fiber current mutual inductance device based on a chiral optical fiber coupler comprises a super-radiation light emitting diode light source, namely an SLD light source 1, a photoelectric detector 2, a 2 x 2 single-mode optical fiber coupler 3, a polarizer 4, a straight waveguide phase modulator 5, an optical fiber delay ring 6, a 1 x 2 chiral optical fiber coupler 7, an optical fiber sensing ring 8, a circuit signal processing module 9, a current output end 10 and a current-carrying conductor 11, wherein the SLD light source 1 and the photoelectric detector 2 are both linked with the 2 x 2 single-mode optical fiber coupler 3, the 2 x 2 single-mode optical fiber coupler 3 is connected with the straight waveguide phase modulator 5 through the polarizer 4,
the photoelectric detector 2 is connected with a circuit signal processing module 9, and the circuit signal processing module 9 is respectively connected with a current output end 10 and the straight waveguide phase modulator 5;
the straight waveguide phase modulator 5 is connected with a 1 x 2 chiral optical fiber coupler 7 through an optical fiber delay ring 6, the 1 x 2 chiral optical fiber coupler 7 is connected with an optical fiber sensing ring 8, and a current-carrying conductor 11 is embedded in the optical fiber sensing ring 8.
A fiber current mutual inductance system based on a chiral fiber coupler comprises a light source output end of an SLD light source 1, an input end of a single-mode fiber coupler 3, a left output end of the single-mode fiber coupler 3, an input end of a photoelectric detector 2, a right output end of the single-mode fiber coupler 3, an input end of a polarizer 4, an output end of the photoelectric detector 2, a signal receiving end of a circuit signal processing module 9, an output end of the polarizer 4, a left input end of a straight waveguide phase modulator 5, an output end of the straight waveguide phase modulator 5, an input end of a fiber delay ring 6, an output end of the fiber delay ring 6, an input end of a 1 x 2 chiral fiber coupler 7, the chiral optical fiber 12 and the chiral optical fiber 13 which form the output end of the 1 × 2 chiral optical fiber coupler 7 are respectively connected with two ends of the optical fiber sensing ring 8 to form a closed loop, the output end of the circuit signal processing module 9 is connected to the input end below the straight waveguide phase modulator 5 through a lead, and the current-carrying conductor 11 is wound at the central position of the optical fiber sensing ring.
Further, the 1 × 2 chiral fiber coupler 7 includes a chiral fiber i 12 and a chiral fiber ii 13, where a distance between the chiral fiber i 12 and the chiral fiber ii 13 is d, and a coupling length is L.
Furthermore, the materials of the chiral optical fiber I12 and the chiral optical fiber II 13 are polymethyl methacrylate doped with griseofulvin.
A working method of an optical fiber current mutual inductance system based on a chiral optical fiber coupler is characterized in that a natural light beam emitted by an SLD light source 1 enters a polarizer 4 through a single-mode optical fiber coupler 3, the natural light beam passes through the polarizer 4 and is converted into a linearly polarized light beam, the linearly polarized light beam passes through a straight waveguide phase modulator 5 and an optical fiber delay ring 6 and reaches a 1 x 2 chiral optical fiber coupler 7, the linearly polarized light beam is decomposed into a levorotatory base mode light beam and a dextrorotatory base mode light beam which are equal in size, the dextrorotatory base mode light beam is transmitted from a cladding of a chiral optical fiber 12 by a distance d and then leaks into the cladding of the chiral optical fiber 13, and then enters a fiber core of the chiral optical fiber 13 after passing through a coupling length L; the left-handed fundamental mode light beams are transmitted in the fiber core of the chiral optical fiber 12, and finally the two kinds of light beams in the rotational directions respectively enter the two ends of the optical fiber sensing ring 8;
when a current-carrying conductor 11 passes through current, a Faraday optical rotation effect can be generated in the optical fiber sensing ring 8, both a left-handed base mode light beam and a right-handed base mode light beam in the optical fiber sensing ring 8 carry Faraday optical rotation information, the left-handed base mode light beam and the right-handed base mode light beam return to the 1X 2 chiral optical fiber coupler 7 through a chiral optical fiber 12 and a chiral optical fiber 13, the left-handed base mode light beam and the right-handed base mode light beam pass through an optical fiber delay ring 6 and a straight waveguide phase modulator 5 and then interfere at a polarizer 4, an interfered optical signal passes through a single-mode optical fiber coupler 3 and then reaches a photoelectric detector 2, the photoelectric detector 2 converts the received optical signal into an electric signal, and finally the electric signal is sent to a circuit signal processing module 9 for processing and then outputs a measured current value in a digital quantity form at a position 10, and meanwhile, the circuit signal processing module 9 feeds back the input digital quantity to the straight waveguide phase modulator 5 for signal modulation and demodulation, therefore, the whole FOCT system forms a closed loop to complete the transmission of signals. In the whole signal transmission process, the 1 multiplied by 2 chiral optical fiber coupler (7) replaces the function of a lambda/4 wave plate in the original FOCT system to complete the sensing of optical signals, so that only an optical fiber sensing ring in the FOCT system can be influenced by temperature, the Verdet constant of the optical fiber sensing ring and the temperature are in a linear relation, and the compensation of measurement error signals can be easily realized by adding a temperature compensation algorithm into a circuit signal processing system (9) according to the linear relation. In addition, no lambda/4 wave plate exists in the system, so that no phase delay error exists.
Claims (5)
1. An optical fiber current mutual inductance device based on a chiral optical fiber coupler is characterized by comprising an SLD light source (1), a photoelectric detector (2), a 2 x 2 single-mode optical fiber coupler (3), a polarizer (4), a straight waveguide phase modulator (5), an optical fiber delay ring (6), a 1 x 2 chiral optical fiber coupler (7), an optical fiber sensing ring (8), a circuit signal processing module (9), a current output end (10) and a current-carrying conductor (11), wherein the SLD light source (1) and the photoelectric detector (2) are both linked with the 2 x 2 single-mode optical fiber coupler (3), the 2 x 2 single-mode optical fiber coupler (3) is connected with the straight waveguide phase modulator (5) through the polarizer (4),
the photoelectric detector (2) is connected with a circuit signal processing module (9), and the circuit signal processing module (9) is respectively connected with a current output end (10) and the straight waveguide phase modulator (5);
the straight waveguide phase modulator (5) is connected with a 1 x 2 chiral optical fiber coupler (7) through an optical fiber delay ring (6), the 1 x 2 chiral optical fiber coupler (7) is connected with an optical fiber sensing ring (8), and a current-carrying conductor (11) is embedded in the optical fiber sensing ring (8).
2. An optical fiber current mutual inductance system based on a chiral optical fiber coupler is characterized in that the optical fiber current mutual inductance system comprises an SLD light source (1) light source output end connected to an input end of a single-mode optical fiber coupler (3) through a single-mode optical fiber, a left output end of the single-mode optical fiber coupler (3) is connected to an input end of a photoelectric detector (2) through a single-mode optical fiber, a right output end of the single-mode optical fiber coupler (3) is connected to an input end of a polarizer (4) through a single-mode optical fiber, an output end of the photoelectric detector (2) is connected to a signal receiving end of a circuit signal processing module (9) through a lead, an output end of the polarizer (4) is connected to a left input end of a straight waveguide phase modulator (5) through a polarization maintaining optical fiber, an output end of the straight waveguide phase modulator (5) is connected to an input end of an optical fiber delay ring (6) through a polarization maintaining optical fiber, the output end of the optical fiber delay ring (6) is connected to the input end of a 1 x 2 chiral optical fiber coupler (7) through a chiral optical fiber, a chiral optical fiber (12) and a chiral optical fiber (13) which form the output end of the 1 x 2 chiral optical fiber coupler (7) are respectively connected with two ends of an optical fiber sensing ring (8) to form a closed loop, the output end of a circuit signal processing module (9) is connected to the input end below a straight waveguide phase modulator (5) through a lead, and a current-carrying conductor (11) is wound at the central position of the optical fiber sensing ring.
3. The fiber current mutual inductance system based on the chiral fiber coupler as claimed in claim 1 or 2, wherein the 1 × 2 chiral fiber coupler (7) comprises a chiral fiber i (12) and a chiral fiber ii (13), the distance between the chiral fiber i (12) and the chiral fiber ii (13) is d, and the coupling length is L.
4. The fiber current mutual inductance system based on the chiral fiber coupler of claim 3, wherein the chiral fiber I (12) and the chiral fiber II (13) are made of polymethyl methacrylate doped with griseofulvin.
5. The working method of the fiber current mutual inductance system based on the chiral fiber coupler is characterized in that a natural light beam emitted by the SLD light source (1) enters a polarizer (4) through a single-mode fiber coupler (3), the natural light beam passes through the polarizer (4) and is converted into a linearly polarized light beam, the linearly polarized light beam passes through a straight waveguide phase modulator (5) and a fiber delay ring (6) and reaches a 1 x 2 chiral fiber coupler (7), the linearly polarized light beam is decomposed into a levorotatory fundamental mode light beam and a dextrorotatory fundamental mode light beam which are equal in size, the dextrorotatory fundamental mode light beam is transmitted from the cladding of the chiral fiber (12) by a distance d and then leaks into the cladding of the chiral fiber (13), and then enters the fiber core of the chiral fiber (13) after passing through a coupling length L; the left-handed fundamental mode light beams are transmitted in the fiber core of the chiral optical fiber (12), and finally the two kinds of light beams in the rotary directions respectively enter the two ends of the optical fiber sensing ring (8);
when a current-carrying conductor (11) passes through current, a Faraday optical rotation effect can be generated in an optical fiber sensing ring (8), a left-handed basic mode light beam and a right-handed basic mode light beam in the optical fiber sensing ring (8) both carry Faraday optical rotation information, the left-handed basic mode light beam and the right-handed basic mode light beam return to a 1 x 2 chiral optical fiber coupler (7) through a chiral optical fiber (12) and a chiral optical fiber (13), the left-handed basic mode light beam and the right-handed basic mode light beam interfere at a polarizer (4) after passing through an optical fiber delay ring (6) and a straight waveguide phase modulator (5), an interfered optical signal reaches a photoelectric detector (2) after passing through a single-mode optical fiber coupler (3), the photoelectric detector (2) converts the received optical signal into an electric signal, and finally the electric signal is sent to a circuit signal processing module (9) for processing and then the electric signal is output at a measured current value in a digital quantity form at the polarizer (10), meanwhile, the circuit signal processing module (9) feeds the input digital quantity back to the straight waveguide phase modulator (5) for signal modulation and demodulation, so that the whole FOCT system forms a closed loop to complete signal transmission.
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