Passive all-fiber current transformer and current measurement method

Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a passive all-optical fiber current transformer and a current measurement method, and the passive all-optical fiber current transformer comprises a multiplexing network structure, a pulse light source, a signal processing system and a Michelson interferometer. The multiplexing network structure is respectively connected with the pulse light source, the signal processing system and the Michelson interferometer; the pulse light source is used for transmitting an optical signal to the multiplexing network structure; the multiplexing network structure is used for dividing the optical signal into three paths of pulse light and respectively transmitting the three paths of pulse light to the Michelson interferometer; the three paths of reversely transmitted pulse light are transmitted to a signal processing system; the Michelson interferometer is used for reversely transmitting the three paths of pulse light to the multiplexing network structure; and the signal processing system is used for calculating current information based on the three paths of reversely transmitted pulse light. According to the technical scheme provided by the invention, the intensity demodulation is realized by using the pulse optical power, the demodulation process is simple, the stability is high, and the economic cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a passive all-optical fiber current transformer and a current measurement method. Background Art

[0002] With the continuous improvement of modern science and technology and living standards, voltage levels and transformer capacities are getting higher and higher. How to achieve accurate and safe measurement of current in power systems is a key issue for relevant researchers. The traditional current measurement solution is electromagnetic current transformers, which have many disadvantages such as high difficulty coefficient of high-voltage insulation, susceptibility to external electromagnetic interference, large and bulky size, and poor safety. The all-optical current transformer has the advantages of high accuracy, wide measurement range, anti-electromagnetic interference and no magnetic saturation, which adapts to the needs of the power system to develop towards digitalization, intelligence and networking, and becomes the development trend of current detection in the future.

[0003] The main principle of all-fiber current transformer is the Faraday effect. At present, most of the mature demodulation schemes in China use closed-loop feedback schemes, which are complex in structure and demodulation and high in cost. The advantages of all-fiber current transformer, such as compact structure and low cost, cannot be well applied. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned related technologies, the present invention provides a passive all-optical current transformer and a current measurement method.

[0005] According to a first aspect of an embodiment of the present invention, there is provided a passive all-optical current transformer, comprising: a multiplexing network structure, a pulse light source, a signal processing system and a Michelson interferometer; the multiplexing network structure is connected to the pulse light source, the signal processing system and the Michelson interferometer respectively;

[0006] The pulse light source is used to transmit an optical signal to the multiplexing network structure;

[0007] The multiplexing network structure is used to divide the optical signal into three pulse lights, and transmit the three pulse lights to the Michelson interferometer respectively; and transmit the three pulse lights transmitted in reverse to the signal processing system;

[0008] The Michelson interferometer is used to transmit the three-path pulse light in reverse to the multiplexing network structure;

[0009] The signal processing system is used to calculate and obtain current information based on the three pulse lights transmitted in reverse.

[0010] Preferably, the multiplexing network structure comprises: a first 3×3 optical fiber coupler, a second 3×3 optical fiber coupler, a first optical fiber circulator, a second optical fiber circulator, a third optical fiber circulator, a first optical fiber delay line, a second optical fiber delay line, a third optical fiber delay line, a fourth optical fiber delay line and a third 3×3 optical fiber coupler;

[0011] The pulse light source, the first 3×3 optical fiber coupler and the first optical fiber circulator are connected in sequence;

[0012] The first 3×3 optical fiber coupler, the first optical fiber delay line and the second optical fiber circulator are connected in sequence;

[0013] The first 3×3 optical fiber coupler, the second optical fiber delay line and the third optical fiber circulator are connected in sequence;

[0014] The signal processing system, the second 3×3 optical fiber coupler and the first optical fiber circulator are connected in sequence;

[0015] The second 3×3 optical fiber coupler, the third optical fiber delay line and the second optical fiber circulator are connected in sequence;

[0016] The second 3×3 optical fiber coupler, the fourth optical fiber delay line and the third optical fiber circulator are connected in sequence;

[0017] The third 3×3 optical fiber coupler is connected to the first optical fiber circulator, the second optical fiber circulator, and the third optical fiber circulator respectively.

[0018] Preferably, the Michelson interferometer comprises: a reference arm and a sensing arm; the reference arm comprises: a fifth optical fiber delay line and a second reflector; the sensing arm comprises: a polarizer, a λ / 4 wave plate, a sensing optical fiber ring and a first reflector;

[0019] The third 3×3 optical fiber coupler, the fifth optical fiber delay line and the second reflector are connected in sequence;

[0020] The third 3×3 optical fiber coupler, the polarizer, the λ / 4 wave plate, the sensing optical fiber ring and the first reflector are connected in sequence.

[0021] Preferably, the fifth optical fiber delay line is used to separate the pulsed lights passing through different optical paths in the time domain;

[0022] The polarizer is used to convert input light into linearly polarized light;

[0023] The λ / 4 wave plate is used to convert linearly polarized light into circularly polarized light.

[0024] Preferably, it also includes: a current-carrying wire passing through the sensing optical fiber ring.

[0025] Preferably, the first 3×3 optical fiber coupler is used for:

[0026] The optical signal is divided into three pulse lights to obtain a first pulse light, a second pulse light and a third pulse light, and the first pulse light is transmitted to the third 3×3 fiber coupler through the first fiber circulator, the second pulse light is transmitted to the third 3×3 fiber coupler through the second fiber circulator, and the third pulse light is transmitted to the third 3×3 fiber coupler through the third fiber circulator.

[0027] Preferably, the third 3×3 optical fiber coupler is used for:

[0028] Splitting the first pulse light into two pulse lights to obtain a fourth pulse light and a fifth pulse light, and transmitting the fourth pulse light to the second reflector after passing through the fifth optical fiber delay line, and transmitting the fifth pulse light to the first reflector after passing through the polarizer, the λ / 4 wave plate and the sensing optical fiber ring in sequence;

[0029] Splitting the second pulse light into two pulse lights to obtain a sixth pulse light and a seventh pulse light, and transmitting the sixth pulse light to the second reflector after passing through the fifth optical fiber delay line, and transmitting the seventh pulse light to the first reflector after passing through the polarizer, the λ / 4 wave plate and the sensing optical fiber ring in sequence;

[0030] The third pulse light is divided into two pulse lights to obtain an eighth pulse light and a ninth pulse light, and the eighth pulse light is transmitted to the second reflector after passing through the fifth optical fiber delay line, and the ninth pulse light is transmitted to the first reflector after passing through the polarizer, the λ / 4 wave plate and the sensing optical fiber ring in sequence.

[0031] Preferably, the second reflector is used to respectively transmit the fourth pulse light, the sixth pulse light and the eighth pulse light in reverse order so that the fourth pulse light, the sixth pulse light and the eighth pulse light are all transmitted to the third 3×3 optical fiber coupler after passing through the fifth optical fiber delay line;

[0032] The first reflector is used to transmit the fifth pulse light, the seventh pulse light and the ninth pulse light in reverse order respectively, so that the fifth pulse light, the seventh pulse light and the ninth pulse light are transmitted to the third 3×3 fiber coupler after passing through the sensing fiber ring, the λ / 4 wave plate and the polarizer in sequence.

[0033] Preferably, the third 3×3 optical fiber coupler is used for:

[0034] The fourth pulse light and the fifth pulse light that are transmitted in reverse are coupled to obtain a tenth pulse light, and the tenth pulse light is divided into three paths to obtain a thirteenth pulse light, a fourteenth pulse light, and a fifteenth pulse light; and the thirteenth pulse light is transmitted to the second 3×3 fiber coupler through the first fiber circulator, the fourteenth pulse light is transmitted to the second 3×3 fiber coupler after passing through the second fiber circulator and the third fiber delay line in sequence, and the fifteenth pulse light is transmitted to the second 3×3 fiber coupler after passing through the third fiber circulator and the fourth fiber delay line in sequence;

[0035] The sixth pulse light and the seventh pulse light that are transmitted in reverse are coupled to obtain an eleventh pulse light, and the eleventh pulse light is divided into three paths to obtain a sixteenth pulse light, a seventeenth pulse light and an eighteenth pulse light; and the sixteenth pulse light is transmitted to the second 3×3 fiber coupler through the first fiber circulator, the seventeenth pulse light is transmitted to the second 3×3 fiber coupler after passing through the second fiber circulator and the third fiber delay line in sequence, and the eighteenth pulse light is transmitted to the second 3×3 fiber coupler after passing through the third fiber circulator and the fourth fiber delay line in sequence;

[0036] The eighth pulse light and the ninth pulse light that are transmitted in reverse are coupled to obtain a twelfth pulse light, and the twelfth pulse light is divided into three paths to obtain a nineteenth pulse light, a twentieth pulse light, and a twenty-first pulse light; and the nineteenth pulse light is transmitted to the second 3×3 fiber coupler through the first fiber circulator, the 20th pulse light is transmitted to the second 3×3 fiber coupler after passing through the second fiber circulator and the third fiber delay line in sequence, and the twenty-first pulse light is transmitted to the second 3×3 fiber coupler after passing through the third fiber circulator and the fourth fiber delay line in sequence.

[0037] Preferably, the signal processing system comprises:

[0038] a conversion module, for performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light and the twenty-first pulse of light;

[0039] a first calculation module, configured to synthesize the intensities of the thirteenth pulse of light, the fourteenth pulse of light, and the fifteenth pulse of light to obtain a first synthesized intensity; synthesize the intensities of the sixteenth pulse of light, the seventeenth pulse of light, and the eighteenth pulse of light to obtain a second synthesized intensity; and synthesize the intensities of the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light to obtain a third synthesized intensity;

[0040] The second calculation module is used to calculate the current information by using an inverse tangent algorithm based on the first synthesis intensity, the second synthesis intensity and the third synthesis intensity.

[0041] Preferably, the signal processing system further includes:

[0042] A display module, used for displaying the current information;

[0043] A saving module is used to save the current information.

[0044] Preferably, the sensing optical fiber ring is formed by winding a circular optical fiber.

[0045] Preferably, the λ / 4 wave plate is made of elliptical core polarization-maintaining optical fiber and elliptical core polarization-maintaining optical fiber.

[0046] Preferably, the calculation formula for the intensity of the pulsed light includes:

[0047] P jk =s j ·ρ jk ·d k

[0048] The calculation formulas for the first composite strength, the second composite strength and the third composite strength include:

[0049]

[0050] Among them, the calculation formula of the phase characteristics of pulse light includes:

[0051]

[0052] In the above formula, P jk is the intensity of the pulsed light, P jk = {P 11 ,P 12 ,P 13 ,P 21 ,P 22 ,P 23 ,P 31 ,P 32 ,P 33}, P 11is the intensity of the thirteenth pulse light after being output from the second 3×3 fiber coupler, P 12 is the intensity of the fourteenth pulse light after being output from the second 3×3 fiber coupler, P 13 is the intensity of the fifteenth pulse light after it is output from the second 3×3 fiber coupler, P 21 is the intensity of the sixteenth pulse light after being output from the second 3×3 fiber coupler, P 22 is the intensity of the seventeenth pulse light after being output from the second 3×3 fiber coupler, P 23 is the intensity of the eighteenth pulse light after being output from the second 3×3 fiber coupler, P 31 is the intensity of the nineteenth pulse light after it is output from the second 3×3 fiber coupler, P 32 is the intensity of the twentieth pulse light after it is output from the second 3×3 fiber coupler, P 33 is the intensity of the twenty-first pulse light after being output from the second 3×3 fiber coupler; s j is the loss fraction of the optical path before entering the Michelson interferometer, s j ={s1,s2,s3}, s1 is the loss fraction of the optical path before the first pulse light enters the Michelson interferometer, s2 is the loss fraction of the optical path before the second pulse light enters the Michelson interferometer, and s3 is the loss fraction of the optical path before the third pulse light enters the Michelson interferometer; d k is the loss fraction of the optical path that the pulse light passes through after being transmitted from the third 3×3 fiber coupler to the second 3×3 fiber coupler and then output, d k ={d1, d2, d3}, d1 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler, the first fiber circulator, and the second 3×3 fiber coupler in sequence and is output, d2 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler, the second fiber circulator, and the second 3×3 fiber coupler in sequence and is output, and d3 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler, the third fiber circulator, and the second 3×3 fiber coupler in sequence and is output; ρ jk is the phase characteristic of the pulse light, ρ jk ={ρ 11 ,ρ 12 ,ρ 13 ,ρ 21 ,ρ 22 ,ρ 23 ,ρ 31 ,ρ 32 ,ρ 33}, ρ 11 is the phase characteristic of the thirteenth pulse light, ρ 12 is the phase characteristic of the fourteenth pulse light, ρ 13 is the phase characteristic of the fifteenth pulse light, ρ 21is the phase characteristic of the sixteenth pulse light, ρ 22 is the phase characteristic of the seventeenth pulse light, ρ 23 is the phase characteristic of the eighteenth pulse light, ρ 31 is the phase characteristic of the nineteenth pulse light, ρ 32 is the phase characteristic of the twentieth pulse light, ρ 33 is the phase characteristic of the twenty-first pulse light, A is the DC coefficient, B is the cosine coefficient, θ0 is the output phase difference characteristic of the 3×3 fiber coupler, φ is the phase difference generated by the current, P1 is the first synthetic intensity, P2 is the second synthetic intensity, and P3 is the third synthetic intensity.

[0053] Preferably, the calculation formula of the current information includes:

[0054]

[0055] In the above formula, I is the current information, V is the Verdet constant, N is the number of turns of the sensing optical fiber loop, P1 is the first composite intensity, P2 is the second composite intensity, and P3 is the third composite intensity.

[0056] According to a second aspect of an embodiment of the present invention, there is provided a current measurement method based on a passive all-optical current transformer, comprising:

[0057] Using a pulsed light source to transmit an optical signal to a multiplexed network structure;

[0058] Using a multiplexing network structure to divide the optical signal into three pulse lights, and transmitting the three pulse lights to a Michelson interferometer respectively; and transmitting the three pulse lights transmitted in reverse to a signal processing system;

[0059] The three-path pulse light is transmitted in reverse to a multiplexing network structure by using a Michelson interferometer;

[0060] The signal processing system is used to calculate the current information based on the three pulse lights transmitted in the opposite direction.

[0061] Preferably, the method of using a multiplexing network structure to divide the optical signal into three pulse lights, and transmitting the three pulse lights to a Michelson interferometer respectively, comprises:

[0062] Using a first 3×3 fiber coupler to split the optical signal into three pulse lights, obtaining a first pulse light, a second pulse light, and a third pulse light, and transmitting the first pulse light to a third 3×3 fiber coupler through a first fiber circulator, transmitting the second pulse light to a third 3×3 fiber coupler through a second fiber circulator, and transmitting the third pulse light to a third 3×3 fiber coupler through a third fiber circulator;

[0063] The first pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler to obtain a fourth pulse light and a fifth pulse light, and the fourth pulse light is transmitted to the second reflector after passing through a fifth optical fiber delay line, and the fifth pulse light is transmitted to the first reflector after passing through a polarizer, a λ / 4 wave plate and a sensing optical fiber ring in sequence;

[0064] The second pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler to obtain a sixth pulse light and a seventh pulse light, and the sixth pulse light is transmitted to the second reflector after passing through a fifth optical fiber delay line, and the seventh pulse light is transmitted to the first reflector after passing through a polarizer, a λ / 4 wave plate and a sensing optical fiber ring in sequence;

[0065] The third pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler to obtain an eighth pulse light and a ninth pulse light, and the eighth pulse light is transmitted to the second reflector after passing through a fifth optical fiber delay line, and the ninth pulse light is transmitted to the first reflector after passing through a polarizer, a λ / 4 wave plate and a sensing optical fiber ring in sequence.

[0066] Preferably, the reverse transmission of the three-path pulse light to the multiplexing network structure by using a Michelson interferometer includes:

[0067] Reversely transmitting the fifth pulse light, the seventh pulse light and the ninth pulse light to a multiplexing network structure respectively using a first reflector;

[0068] The fourth pulse light, the sixth pulse light and the eighth pulse light are respectively transmitted in reverse to the multiplexing network structure by using a second reflector.

[0069] Preferably, the three-path pulse light to be transmitted in reverse is transmitted to a signal processing system, comprising:

[0070] The fourth pulse light and the fifth pulse light that are transmitted in reverse are coupled by a third 3×3 optical fiber coupler to obtain a tenth pulse light, and the tenth pulse light is divided into three paths to obtain a thirteenth pulse light, a fourteenth pulse light, and a fifteenth pulse light; and the thirteenth pulse light is transmitted to the second 3×3 optical fiber coupler through the first optical fiber circulator, the fourteenth pulse light is transmitted to the second 3×3 optical fiber coupler after passing through the second optical fiber circulator and the third optical fiber delay line in sequence, and the fifteenth pulse light is transmitted to the second 3×3 optical fiber coupler after passing through the third optical fiber circulator and the fourth optical fiber delay line in sequence;

[0071] The sixth pulse light and the seventh pulse light that are transmitted in reverse are coupled by a third 3×3 optical fiber coupler to obtain an eleventh pulse light, and the eleventh pulse light is divided into three paths to obtain a sixteenth pulse light, a seventeenth pulse light, and an eighteenth pulse light; and the sixteenth pulse light is transmitted to the second 3×3 optical fiber coupler through a first optical fiber circulator, the seventeenth pulse light is transmitted to the second 3×3 optical fiber coupler after passing through a second optical fiber circulator and a third optical fiber delay line in sequence, and the eighteenth pulse light is transmitted to the second 3×3 optical fiber coupler after passing through a third optical fiber circulator and a fourth optical fiber delay line in sequence;

[0072] A third 3×3 optical fiber coupler is used to couple the eighth pulse light and the ninth pulse light that are transmitted in reverse to obtain a twelfth pulse light, and the twelfth pulse light is divided into three paths to obtain a nineteenth pulse light, a twentieth pulse light, and a twenty-first pulse light; and the nineteenth pulse light is transmitted to the second 3×3 optical fiber coupler through a first optical fiber circulator, the twentieth pulse light is transmitted to the second 3×3 optical fiber coupler after passing through a second optical fiber circulator and a third optical fiber delay line in sequence, and the twenty-first pulse light is transmitted to the second 3×3 optical fiber coupler after passing through a third optical fiber circulator and a fourth optical fiber delay line in sequence.

[0073] Preferably, the method of calculating the current information using the signal processing system based on the three pulse lights transmitted in reverse direction comprises:

[0074] performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light;

[0075] synthesizing the intensities of the thirteenth pulse light, the fourteenth pulse light, and the fifteenth pulse light to obtain a first synthesized intensity;

[0076] synthesizing the intensities of the sixteenth pulse of light, the seventeenth pulse of light, and the eighteenth pulse of light to obtain a second synthesized intensity;

[0077] synthesizing the intensities of the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light to obtain a third synthesized intensity;

[0078] Based on the first combined intensity, the second combined intensity and the third combined intensity, the current information is calculated using an inverse tangent algorithm.

[0079] According to a third aspect of an embodiment of the present invention, there is provided an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0080] The memory is used to store one or more programs;

[0081] When the one or more programs are executed by the at least one processor, the current measurement method is implemented.

[0082] According to a fourth aspect of an embodiment of the present invention, a readable storage medium is provided, on which an execution program is stored. When the execution program is executed, the current measurement method is implemented.

[0083] The technical solution provided by the present invention has the following beneficial effects:

[0084] The present invention provides a passive all-optical current transformer and a current measurement method. A pulse light source transmits an optical signal to a multiplexing network structure, the multiplexing network structure divides the optical signal into three pulse lights, and the three pulse lights are respectively transmitted to a Michelson interferometer; and the three pulse lights transmitted in reverse are transmitted to a signal processing system, the Michelson interferometer transmits the three pulse lights in reverse to the multiplexing network structure, the signal processing system calculates current information based on the three pulse lights transmitted in reverse, and intensity demodulation is realized by using the pulse light power. Not only is the demodulation process simple, the stability is high, but also the economic cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0086] Figure 1 is a structural block diagram of a passive all-optical current transformer provided by an embodiment of the present invention;

[0087] Figure 2 is a flow chart of a measurement method based on a passive all-optical current transformer provided by an embodiment of the present invention;

[0088] Figure 3 is a structural block diagram of an electronic device provided by an embodiment of the present invention;

[0089] In the figure, 1-multiplexing network structure, 2-polarizer, 3-λ / 4 wave plate, 4-sensing fiber ring, 5-current-carrying wire, 6-first reflector, 7-fifth fiber delay line, 8-second reflector, 9-pulse light source, 10-signal processing system, 11-first 3×3 fiber coupler, 12-second 3×3 fiber coupler, 13-first fiber circulator, 14-second fiber circulator, 15-third fiber circulator, 16-first fiber delay line, 17-second fiber delay line, 18-third fiber delay line, 19-fourth fiber delay line, 20-third 3×3 fiber coupler, 21-Michelson interferometer, 22-reference arm, 23-sensing arm. DETAILED DESCRIPTION

[0090] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the following embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0091] Embodiment 1

[0092] The present invention provides a passive all-optical current transformer, such as Figure 1 As shown, it includes: a multiplexing network structure 1, a pulse light source 9, a signal processing system 10 and a Michelson interferometer 21; the multiplexing network structure 1 is connected to the pulse light source 9, the signal processing system 10 and the Michelson interferometer 21 respectively;

[0093] A pulse light source 9, used for transmitting an optical signal to the multiplexing network structure 1;

[0094] The multiplexing network structure 1 is used to divide the optical signal into three pulse lights, and transmit the three pulse lights to the Michelson interferometer 21 respectively; and transmit the three pulse lights to be transmitted in reverse to the signal processing system 10;

[0095] Michelson interferometer 21, used for reversely transmitting three-way pulse light to the multiplexing network structure 1;

[0096] The signal processing system 10 is used to calculate and obtain current information based on three pulse lights transmitted in reverse.

[0097] The output signals of the three different ports of the 3×3 fiber coupler have a phase difference of 120°. The use of the 3×3 coupler can make the structure more compact, and the use of passive devices such as couplers can also greatly reduce costs. Therefore, studying a passive all-optical current transformer solution based on a 3×3 fiber coupler is of great significance to achieving lower-cost and compact current measurement, and has high research value and practicality. Further, the multiplexing network structure 1 includes: a first 3×3 fiber coupler 11, a second 3×3 fiber coupler 12, a first fiber circulator 13, a second fiber circulator 14, a third fiber circulator 15, a first fiber delay line 16, a second fiber delay line 17, a third fiber delay line 18, a fourth fiber delay line 19 and a third 3×3 fiber coupler 20;

[0098] The pulse light source 9, the first 3×3 optical fiber coupler 11 and the first optical fiber circulator 13 are connected in sequence;

[0099] The first 3×3 optical fiber coupler 11, the first optical fiber delay line 16 and the second optical fiber circulator 14 are connected in sequence;

[0100] The first 3×3 optical fiber coupler 11, the second optical fiber delay line 17 and the third optical fiber circulator 15 are connected in sequence;

[0101] The signal processing system 10, the second 3×3 optical fiber coupler 12 and the first optical fiber circulator 13 are connected in sequence;

[0102] The second 3×3 optical fiber coupler 12, the third optical fiber delay line 18 and the second optical fiber circulator 14 are connected in sequence;

[0103] The second 3×3 optical fiber coupler 12, the fourth optical fiber delay line 19 and the third optical fiber circulator 15 are connected in sequence;

[0104] The third 3×3 optical fiber coupler 20 is connected to the first optical fiber circulator 13 , the second optical fiber circulator 14 , and the third optical fiber circulator 15 respectively.

[0105] The multiplexing network structure 1 provided by the present invention is composed of passive components: optical fiber couplers are used for splitting and combining optical signals; optical fiber circulators are used for distributing and converting optical signals; optical fiber delay lines have different lengths, which separate optical pulses passing through different optical paths in the time domain.

[0106] Based on the existing all-fiber current transformer, the present invention only needs to use the commonly used 3×3 coupler, fiber circulator and fiber delay line and other passive devices to build a multiplexed network structure. Aiming at the traditional system, the invention aims to design an anti-interference passive, compact and low-cost all-fiber current transformer, combined with the demodulation technology of 3×3 coupler, and use simple intensity demodulation to achieve stable and reliable current measurement.

[0107] Further, the Michelson interferometer 21 includes: a reference arm 22 and a sensing arm 23; the reference arm 22 includes: a fifth optical fiber delay line 7 and a second reflector 8; the sensing arm 23 includes: a polarizer 2, a λ / 4 wave plate 3, a sensing optical fiber ring 4 and a first reflector 6; a third 3×3 optical fiber coupler 20, a fifth optical fiber delay line 7 and a second reflector 8 are connected in sequence;

[0108] The third 3×3 optical fiber coupler 20, the polarizer 2, the λ / 4 wave plate 3, the sensing optical fiber ring 4 and the first reflector 6 are connected in sequence.

[0109] Furthermore, it also includes: a current-carrying wire 5 passing through the sensing optical fiber ring 4.

[0110] Specifically, the sensing optical fiber ring 4 is wound with a circular optical fiber;

[0111] The λ / 4 wave plate 3 is made of elliptical core polarization-maintaining optical fiber and elliptical core polarization-maintaining optical fiber.

[0112] In some embodiments, the manufacturing process of the λ / 4 wave plate 3 includes:

[0113] The panda core polarization-maintaining fiber and the elliptical core polarization-maintaining fiber with a length of one quarter of the beat length are fused at 45 degrees to obtain the λ / 4 wave plate 3.

[0114] It should be noted that the functions realized by the optical fiber coupler, optical fiber circulator, optical fiber delay line, polarizer, λ / 4 wave plate and reflector are well known to those skilled in the art, so their specific implementation methods are not described in detail. In some embodiments, the optical fiber coupler is used for beam splitting and beam combining of optical signals; the optical fiber circulator is used to realize the distribution and conversion of optical signals; the optical fiber delay line is used to separate the pulsed light passing through different optical paths in the time domain; the polarizer is used to convert the input light into linearly polarized light; the λ / 4 wave plate is used to convert the linearly polarized light into circularly polarized light; and the reflector is used for the reverse transmission of the pulsed light.

[0115] It can be understood that the 3×3 fiber coupler and the fiber circulator are used for the transmission, distribution and combination of optical pulses; and the fiber delay line is used for the delay of pulsed optical signals.

[0116] Furthermore, the first 3×3 optical fiber coupler 11 is used for:

[0117] The optical signal is divided into three pulse lights to obtain a first pulse light, a second pulse light and a third pulse light, and the first pulse light is transmitted to the third 3×3 fiber coupler 20 through the first fiber circulator 13, the second pulse light is transmitted to the third 3×3 fiber coupler 20 through the second fiber circulator 14, and the third pulse light is transmitted to the third 3×3 fiber coupler 20 through the third fiber circulator 15.

[0118] Furthermore, the third 3×3 optical fiber coupler 20 is used for:

[0119] The first pulse light is divided into two pulse lights to obtain a fourth pulse light and a fifth pulse light, and the fourth pulse light is transmitted to the second reflector 8 after passing through the fifth optical fiber delay line 7, and the fifth pulse light is transmitted to the first reflector 6 after passing through the polarizer 2, the λ / 4 wave plate 3 and the sensing optical fiber ring 4 in sequence;

[0120] The second pulse light is divided into two pulse lights to obtain a sixth pulse light and a seventh pulse light, and the sixth pulse light is transmitted to the second reflector 8 after passing through the fifth optical fiber delay line 7, and the seventh pulse light is transmitted to the first reflector 6 after passing through the polarizer 2, the λ / 4 wave plate 3 and the sensing optical fiber ring 4 in sequence;

[0121] The third pulse light is divided into two pulse lights to obtain the eighth pulse light and the ninth pulse light, and the eighth pulse light is transmitted to the second reflector 8 after passing through the fifth optical fiber delay line 7, and the ninth pulse light is transmitted to the first reflector 6 after passing through the polarizer 2, the λ / 4 wave plate 3 and the sensing optical fiber ring 4 in sequence.

[0122] Furthermore, the second reflector 8 is used to transmit the fourth pulse light, the sixth pulse light and the eighth pulse light in reverse direction respectively, so that the fourth pulse light, the sixth pulse light and the eighth pulse light are all transmitted to the third 3×3 optical fiber coupler 20 after passing through the fifth optical fiber delay line 7;

[0123] The first reflector 6 is used to transmit the fifth pulse light, the seventh pulse light and the ninth pulse light in reverse direction respectively, so that the fifth pulse light, the seventh pulse light and the ninth pulse light are transmitted to the third 3×3 fiber coupler 20 after passing through the sensing fiber ring 4, the λ / 4 wave plate 3 and the polarizer 2 in sequence.

[0124] Furthermore, the third 3×3 optical fiber coupler 20 is used for:

[0125] The fourth pulse light and the fifth pulse light that are transmitted in reverse are coupled to obtain the tenth pulse light, and the tenth pulse light is divided into three paths to obtain the thirteenth pulse light, the fourteenth pulse light and the fifteenth pulse light; and the thirteenth pulse light is transmitted to the second 3×3 fiber coupler 12 through the first fiber circulator 13, the fourteenth pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and the fifteenth pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence;

[0126] The sixth pulse light and the seventh pulse light that are transmitted in reverse are coupled to obtain the eleventh pulse light, and the eleventh pulse light is divided into three paths to obtain the sixteenth pulse light, the seventeenth pulse light and the eighteenth pulse light; and the sixteenth pulse light is transmitted to the second 3×3 fiber coupler 12 through the first fiber circulator 13, the seventeenth pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and the eighteenth pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence;

[0127] The eighth pulse light and the ninth pulse light transmitted in reverse are coupled to obtain the twelfth pulse light, and the twelfth pulse light is divided into three paths to obtain the nineteenth pulse light, the twentieth pulse light and the twenty-first pulse light; and the nineteenth pulse light is transmitted to the second 3×3 fiber coupler 12 through the first fiber circulator 13, the twentieth pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and the twenty-first pulse light is transmitted to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence.

[0128] The signal processing system 10 is used for photoelectric conversion and display of signals, and storage and processing of data. Therefore, further, the signal processing system 10 includes:

[0129] a conversion module, for performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light;

[0130] a first calculation module, for synthesizing the intensities of the thirteenth pulse of light, the fourteenth pulse of light, and the fifteenth pulse of light to obtain a first synthesized intensity; synthesizing the intensities of the sixteenth pulse of light, the seventeenth pulse of light, and the eighteenth pulse of light to obtain a second synthesized intensity; and synthesizing the intensities of the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light to obtain a third synthesized intensity;

[0131] Specifically, the calculation formula for the intensity of pulse light includes:

[0132] P jk =s j ·ρ jk ·d k

[0133] The calculation formulas for the first composite strength, the second composite strength and the third composite strength include:

[0134]

[0135] Among them, the calculation formula of the phase characteristics of pulse light includes:

[0136]

[0137] In the above formula, P jk is the intensity of the pulsed light, P jk = {P 11 ,P 12 ,P 13 ,P 21 ,P 22 ,P 23 ,P 31 ,P 32 ,P 33}, P 11 is the intensity of the thirteenth pulse light after being output from the second 3×3 fiber coupler 12, P 12 is the intensity of the fourteenth pulse light after being output from the second 3×3 fiber coupler 12, P 13 is the intensity of the fifteenth pulse light after being output from the second 3×3 fiber coupler 12, P 21 is the intensity of the sixteenth pulse light after being output from the second 3×3 fiber coupler 12, P 22 is the intensity of the seventeenth pulse light after being output from the second 3×3 fiber coupler 12, P 23 is the intensity of the eighteenth pulse light after being output from the second 3×3 fiber coupler 12, P 31 is the intensity of the nineteenth pulse light after being output from the second 3×3 fiber coupler 12, P 32 is the intensity of the twentieth pulse light after being output from the second 3×3 fiber coupler 12, P 33 is the intensity of the twenty-first pulse light after being output from the second 3×3 fiber coupler 12; s j is the loss fraction of the optical path before entering the Michelson interferometer, s j ={s1,s2,s3}, s1 is the loss fraction of the optical path before the first pulse light enters the Michelson interferometer, s2 is the loss fraction of the optical path before the second pulse light enters the Michelson interferometer, and s3 is the loss fraction of the optical path before the third pulse light enters the Michelson interferometer; d k is the loss fraction of the optical path that the pulse light passes through after being transmitted from the third 3×3 fiber coupler 20 to the second 3×3 fiber coupler 12 and then output, d k={d1, d2, d3}, d1 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the first fiber circulator 13, and the second 3×3 fiber coupler 12 in sequence and is output, d2 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the second fiber circulator 14, and the second 3×3 fiber coupler 12 in sequence and is output, and d3 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the third fiber circulator 15, and the second 3×3 fiber coupler 12 in sequence and is output; ρ jk is the phase characteristic of the pulse light, ρ jk ={ρ 11 ,ρ 12 ,ρ 13 ,ρ 21 ,ρ 22 ,ρ 23 ,ρ 31 ,ρ 32 ,ρ 33}, ρ 11 is the phase characteristic of the thirteenth pulse light, ρ 12 is the phase characteristic of the fourteenth pulse light, ρ 13 is the phase characteristic of the fifteenth pulse light, ρ 21 is the phase characteristic of the sixteenth pulse light, ρ 22 is the phase characteristic of the seventeenth pulse light, ρ 23 is the phase characteristic of the eighteenth pulse light, ρ 31 is the phase characteristic of the nineteenth pulse light, ρ 32 is the phase characteristic of the twentieth pulse light, ρ 33 is the phase characteristic of the twenty-first pulse light, A is the DC coefficient, B is the cosine coefficient, θ0 is the output phase difference characteristic of the 3×3 fiber coupler, φ is the phase difference generated by the current, P1 is the first synthetic intensity, P2 is the second synthetic intensity, and P3 is the third synthetic intensity;

[0138] A second calculation module is used to calculate the current information by using an inverse tangent algorithm based on the first composite intensity, the second composite intensity and the third composite intensity;

[0139] Specifically, the calculation formula for current information includes:

[0140]

[0141] In the above formula, I is the current information, V is the Verdet constant, N is the number of turns of the sensing optical fiber loop, P1 is the first composite intensity, P2 is the second composite intensity, and P3 is the third composite intensity.

[0142] Furthermore, the signal processing system 10 further includes:

[0143] A display module, used for displaying current information;

[0144] The saving module is used to save the current information.

[0145] The present invention provides a passive all-fiber current transformer, in which a pulse light source 9 emits an optical signal that first enters a multiplexing network structure 1. First, the pulse light is divided into three optical pulses through a 3×3 fiber coupler 11 and then transmitted. Two of the pulses pass through fiber delay lines 16 and 17 respectively, and the three pulses arrive at fiber circulators 13, 14 and 15 at different times. The three pulse lights pass through a 3×3 fiber coupler 20 at different times and arrive at a Michelson interferometer for sensing (one of which is a reference arm 22 composed of a fiber delay line 7 and a reflector 8; the other is a sensor arm 23 composed of a polarizer 2, a λ / 4 wave plate 3, a sensing fiber 4 and a reflector 6). The light is transmitted in the reverse direction after passing through reflectors 6 and 8. Each pulse light input into the 3×3 fiber coupler 20 is divided into three outputs, two of which pass through fiber delay lines 18 and 19 and arrive at a signal processing system 12. A total of nine pulse lights are detected for subsequent demodulation. The sensing principle is the Faraday effect. Light becomes linearly polarized light after passing through the polarizer, and then becomes circularly polarized light after passing through the λ / 4 wave plate. The magnetic field generated by the transmission current causes a certain change in the phase of the circularly polarized light; due to the non-reciprocity of the Faraday effect, the phase shift caused by Faraday doubles after the circularly polarized light is transmitted in the reverse direction. The reference light passing through the reference arm 22 and the sensing light carrying the current information interfere at the 3×3 fiber coupler. The interference signal is received and converted to photoelectricity, and the current information can be obtained through the inverse tangent algorithm.

[0146] The present invention provides a passive all-optical fiber current transformer. Except for a light source, all system sensor devices are passive devices, and the solution cost is low. An inverse tangent demodulation scheme is adopted to realize intensity demodulation through pulsed optical power, and the demodulation process is simple. The component of optical path loss is removed, and the system is insensitive to the jitter of the light source power and the sudden change of the optical path loss, and has high stability.

[0147] Embodiment 2

[0148] The present invention also provides a current measurement method based on the passive all-optical current transformer provided in the first embodiment, such as Figure 2 As shown, including:

[0149] Step 11: using the pulse light source 9 to transmit an optical signal to the multiplexing network structure 1;

[0150] Step 12: using the multiplexing network structure 1 to divide the optical signal into three pulse lights, and transmitting the three pulse lights to the Michelson interferometer 21 respectively; and transmitting the three pulse lights to be transmitted in reverse to the signal processing system 10;

[0151] Step 13: using the Michelson interferometer 21 to transmit the three-way pulse light in reverse to the multiplexing network structure 1;

[0152] Step 14: Utilize the signal processing system 10 to calculate the current information based on the three pulse lights transmitted in the opposite direction.

[0153] Furthermore, in step 12, the optical signal is divided into three pulse lights by using the multiplexing network structure 1, and the three pulse lights are respectively transmitted to the Michelson interferometer 21, including:

[0154] Step 121: using the first 3×3 fiber coupler 11 to split the optical signal into three pulse lights, obtaining a first pulse light, a second pulse light, and a third pulse light, and transmitting the first pulse light to the third 3×3 fiber coupler 20 through the first fiber circulator 13, transmitting the second pulse light to the third 3×3 fiber coupler 20 through the second fiber circulator 14, and transmitting the third pulse light to the third 3×3 fiber coupler 20 through the third fiber circulator 15;

[0155] Step 122: using the third 3×3 fiber coupler 20 to split the first pulse light into two pulse lights, obtaining a fourth pulse light and a fifth pulse light, and transmitting the fourth pulse light to the second reflector 8 after passing through the fifth fiber delay line 7, and transmitting the fifth pulse light to the first reflector 6 after passing through the polarizer 2, the λ / 4 wave plate 3 and the sensing fiber ring 4 in sequence;

[0156] Step 123: using the third 3×3 fiber coupler 20 to split the second pulse light into two pulse lights, obtaining a sixth pulse light and a seventh pulse light, and transmitting the sixth pulse light to the second reflector 8 after passing through the fifth fiber delay line 7, and transmitting the seventh pulse light to the first reflector 6 after passing through the polarizer 2, the λ / 4 wave plate 3 and the sensing fiber ring 4 in sequence;

[0157] Step 124: Use the third 3×3 optical fiber coupler 20 to split the third pulse light into two pulse lights to obtain the eighth pulse light and the ninth pulse light, and transmit the eighth pulse light to the second reflector 8 after passing through the fifth optical fiber delay line 7, and transmit the ninth pulse light to the first reflector 6 after passing through the polarizer 2, λ / 4 wave plate 3 and the sensing optical fiber ring 4 in sequence.

[0158] Further, step 13 includes:

[0159] Step 131: using the first reflector 6 to respectively transmit the fifth pulse light, the seventh pulse light and the ninth pulse light in reverse direction to the multiplexing network structure 1;

[0160] Step 132: Use the second reflector 8 to reversely transmit the fourth pulse light, the sixth pulse light and the eighth pulse light to the multiplexing network structure 1 respectively.

[0161] Furthermore, in step 12, the three pulse lights transmitted in the reverse direction are transmitted to the signal processing system 10, including:

[0162] Step 125: using the third 3×3 fiber coupler 20 to couple the fourth pulse light and the fifth pulse light that are transmitted in reverse direction to obtain the tenth pulse light, and dividing the tenth pulse light into three paths to obtain the thirteenth pulse light, the fourteenth pulse light and the fifteenth pulse light; and transmitting the thirteenth pulse light to the second 3×3 fiber coupler 12 through the first fiber circulator 13, transmitting the fourteenth pulse light to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and transmitting the fifteenth pulse light to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence;

[0163] Step 126: using the third 3×3 fiber coupler 20 to couple the sixth pulse light and the seventh pulse light that are transmitted in the opposite direction to obtain the eleventh pulse light, and dividing the eleventh pulse light into three paths to obtain the sixteenth pulse light, the seventeenth pulse light and the eighteenth pulse light; and transmitting the sixteenth pulse light to the second 3×3 fiber coupler 12 through the first fiber circulator 13, transmitting the seventeenth pulse light to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and transmitting the eighteenth pulse light to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence;

[0164] Step 127: Use the third 3×3 fiber coupler 20 to couple the eighth pulse light and the ninth pulse light that are transmitted in reverse to obtain the twelfth pulse light, and divide the twelfth pulse light into three paths to obtain the nineteenth pulse light, the twentieth pulse light, and the twenty-first pulse light; and transmit the nineteenth pulse light to the second 3×3 fiber coupler 12 through the first fiber circulator 13, transmit the twentieth pulse light to the second 3×3 fiber coupler 12 after passing through the second fiber circulator 14 and the third fiber delay line 18 in sequence, and transmit the twenty-first pulse light to the second 3×3 fiber coupler 12 after passing through the third fiber circulator 15 and the fourth fiber delay line 19 in sequence.

[0165] Further, step 14 includes:

[0166] Step 141: performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light;

[0167] Step 142: synthesizing the intensities of the thirteenth pulse light, the fourteenth pulse light, and the fifteenth pulse light to obtain a first synthesized intensity;

[0168] Step 143: synthesizing the intensities of the sixteenth pulse light, the seventeenth pulse light, and the eighteenth pulse light to obtain a second synthesized intensity;

[0169] Step 144: synthesizing the intensities of the nineteenth pulse light, the twentieth pulse light, and the twenty-first pulse light to obtain a third synthesized intensity;

[0170] Specifically, the calculation formula for the intensity of pulse light includes:

[0171] P jk =s j ·ρ jk ·d k

[0172] The calculation formulas for the first composite strength, the second composite strength and the third composite strength include:

[0173]

[0174] Among them, the calculation formula of the phase characteristics of pulse light includes:

[0175]

[0176] In the above formula, P jk is the intensity of the pulsed light, P jk = {P 11 ,P 12 ,P 13 ,P 21 ,P 22 ,P 23 ,P 31 ,P 32 ,P 33}, P 11 is the intensity of the thirteenth pulse light after being output from the second 3×3 fiber coupler 12, P 12 is the intensity of the fourteenth pulse light after being output from the second 3×3 fiber coupler 12, P 13 is the intensity of the fifteenth pulse light after being output from the second 3×3 fiber coupler 12, P 21 is the intensity of the sixteenth pulse light after being output from the second 3×3 fiber coupler 12, P 22 is the intensity of the seventeenth pulse light after being output from the second 3×3 fiber coupler 12, P 23 is the intensity of the eighteenth pulse light after being output from the second 3×3 fiber coupler 12, P 31 is the intensity of the nineteenth pulse light after being output from the second 3×3 fiber coupler 12, P32 is the intensity of the twentieth pulse light after being output from the second 3×3 fiber coupler 12, P 33 is the intensity of the twenty-first pulse light after being output from the second 3×3 fiber coupler 12; s j is the loss fraction of the optical path before entering the Michelson interferometer, s j ={s1,s2,s3}, s1 is the loss fraction of the optical path before the first pulse light enters the Michelson interferometer, s2 is the loss fraction of the optical path before the second pulse light enters the Michelson interferometer, and s3 is the loss fraction of the optical path before the third pulse light enters the Michelson interferometer; d k is the loss fraction of the optical path that the pulse light passes through after being transmitted from the third 3×3 fiber coupler 20 to the second 3×3 fiber coupler 12 and then output, d k ={d1, d2, d3}, d1 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the first fiber circulator 13, and the second 3×3 fiber coupler 12 in sequence and is output, d2 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the second fiber circulator 14, and the second 3×3 fiber coupler 12 in sequence and is output, and d3 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 fiber coupler 20, the third fiber circulator 15, and the second 3×3 fiber coupler 12 in sequence and is output; ρ jk is the phase characteristic of the pulse light, ρ jk ={ρ 11 ,ρ 12 ,ρ 13 ,ρ 21 ,ρ 22 ,ρ 23 ,ρ 31 ,ρ 32 ,ρ 33}, ρ 11 is the phase characteristic of the thirteenth pulse light, ρ 12 is the phase characteristic of the fourteenth pulse light, ρ 13 is the phase characteristic of the fifteenth pulse light, ρ 21 is the phase characteristic of the sixteenth pulse light, ρ 22 is the phase characteristic of the seventeenth pulse light, ρ 23 is the phase characteristic of the eighteenth pulse light, ρ 31 is the phase characteristic of the nineteenth pulse light, ρ 32 is the phase characteristic of the twentieth pulse light, ρ 33 is the phase characteristic of the twenty-first pulse light, A is the DC coefficient, B is the cosine coefficient, θ0 is the output phase difference characteristic of the 3×3 fiber coupler, φ is the phase difference generated by the current, P1 is the first synthetic intensity, P2 is the second synthetic intensity, and P3 is the third synthetic intensity;

[0177] Step 145: Based on the first composite intensity, the second composite intensity and the third composite intensity, current information is calculated using an inverse tangent algorithm;

[0178] Specifically, the calculation formula for current information includes:

[0179]

[0180] In the above formula, I is the current information, V is the Verdet constant, N is the number of turns of the sensing optical fiber loop, P1 is the first composite intensity, P2 is the second composite intensity, and P3 is the third composite intensity.

[0181] It can be understood that the method embodiments provided above correspond to the embodiments of the passive all-optical current transformer described above, and the corresponding specific contents can be referenced to each other and will not be described in detail here.

[0182] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0183] Embodiment 3

[0184] like Figure 3 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0185] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in a storage medium to implement a corresponding method flow or a corresponding function, so as to implement the steps of a current measurement method based on a passive all-optical current transformer in the above-mentioned embodiment.

[0186] Embodiment 4

[0187] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device for storing programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device and the extended storage medium supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a current measurement method based on a passive all-optical current transformer in the above embodiment.

[0188] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0189] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0190] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0191] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0192] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A passive all-optical current transformer, characterized in that: include: A multiplexing network structure (1), a pulse light source (9), a signal processing system (10) and a Michelson interferometer (21); the multiplexing network structure (1) is connected to the pulse light source (9), the signal processing system (10) and the Michelson interferometer (21) respectively; The pulse light source (9) is used to transmit an optical signal to the multiplexing network structure (1); The multiplexing network structure (1) is used to divide the optical signal into three pulse lights, and transmit the three pulse lights to the Michelson interferometer (21) respectively; and transmit the three pulse lights transmitted in reverse to the signal processing system (10); The Michelson interferometer (21) is used to transmit the three-path pulse light in reverse direction to the multiplexing network structure (1); The signal processing system (10) is used to calculate and obtain current information based on the three pulse lights transmitted in reverse.

2. The passive all-optical current transformer according to claim 1, characterized in that: The multiplexing network structure (1) comprises: a first 3×3 optical fiber coupler (11), a second 3×3 optical fiber coupler (12), a first optical fiber circulator (13), a second optical fiber circulator (14), a third optical fiber circulator (15), a first optical fiber delay line (16), a second optical fiber delay line (17), a third optical fiber delay line (18), a fourth optical fiber delay line (19) and a third 3×3 optical fiber coupler (20); The pulse light source (9), the first 3×3 optical fiber coupler (11) and the first optical fiber circulator (13) are connected in sequence; The first 3×3 optical fiber coupler (11), the first optical fiber delay line (16) and the second optical fiber circulator (14) are connected in sequence; The first 3×3 optical fiber coupler (11), the second optical fiber delay line (17) and the third optical fiber circulator (15) are connected in sequence; The signal processing system (10), the second 3×3 optical fiber coupler (12) and the first optical fiber circulator (13) are connected in sequence; The second 3×3 optical fiber coupler (12), the third optical fiber delay line (18) and the second optical fiber circulator (14) are connected in sequence; The second 3×3 optical fiber coupler (12), the fourth optical fiber delay line (19) and the third optical fiber circulator (15) are connected in sequence; The third 3×3 optical fiber coupler (20) is connected to the first optical fiber circulator (13), the second optical fiber circulator (14), and the third optical fiber circulator (15) respectively.

3. The passive all-optical current transformer according to claim 2, characterized in that: The Michelson interferometer (21) comprises: a reference arm (22) and a sensing arm (23); the reference arm (22) comprises: a fifth optical fiber delay line (7) and a second reflector (8); the sensing arm (23) comprises: a polarizer (2), a λ / 4 wave plate (3), a sensing optical fiber ring (4) and a first reflector (6); The third 3×3 optical fiber coupler (20), the fifth optical fiber delay line (7) and the second reflector (8) are connected in sequence; The third 3×3 optical fiber coupler (20), the polarizer (2), the λ / 4 wave plate (3), the sensing optical fiber ring (4) and the first reflector (6) are connected in sequence.

4. The passive all-optical current transformer according to claim 3, characterized in that: The fifth optical fiber delay line (7) is used to separate the pulsed lights passing through different optical paths in the time domain; The polarizer (2) is used to convert input light into linearly polarized light; The λ / 4 wave plate (3) is used to convert linearly polarized light into circularly polarized light.

5. The passive all-optical current transformer according to claim 3, characterized in that: Also includes: A current-carrying wire (5) is inserted into the sensing optical fiber ring (4).

6. The passive all-optical current transformer according to claim 3, characterized in that: The first 3×3 optical fiber coupler (11) is used for: The optical signal is divided into three pulse lights to obtain a first pulse light, a second pulse light and a third pulse light, and the first pulse light is transmitted to the third 3×3 optical fiber coupler (20) through the first optical fiber circulator (13), the second pulse light is transmitted to the third 3×3 optical fiber coupler (20) through the second optical fiber circulator (14), and the third pulse light is transmitted to the third 3×3 optical fiber coupler (20) through the third optical fiber circulator (15).

7. The passive all-optical current transformer according to claim 6, characterized in that: The third 3×3 optical fiber coupler (20) is used for: The first pulse light is divided into two pulse lights to obtain a fourth pulse light and a fifth pulse light, and the fourth pulse light is transmitted to the second reflector (8) after passing through the fifth optical fiber delay line (7), and the fifth pulse light is transmitted to the first reflector (6) after passing through the polarizer (2), the λ / 4 wave plate (3) and the sensing optical fiber ring (4) in sequence; The second pulse light is divided into two pulse lights to obtain a sixth pulse light and a seventh pulse light, and the sixth pulse light is transmitted to the second reflector (8) after passing through the fifth optical fiber delay line (7), and the seventh pulse light is transmitted to the first reflector (6) after passing through the polarizer (2), the λ / 4 wave plate (3) and the sensing optical fiber ring (4) in sequence; The third pulse light is divided into two pulse lights to obtain an eighth pulse light and a ninth pulse light, and the eighth pulse light is transmitted to the second reflector (8) after passing through the fifth optical fiber delay line (7), and the ninth pulse light is transmitted to the first reflector (6) after passing through the polarizer (2), the λ / 4 wave plate (3) and the sensing optical fiber ring (4) in sequence.

8. The passive all-optical current transformer according to claim 7, characterized in that: The second reflector (8) is used to respectively transmit the fourth pulse light, the sixth pulse light and the eighth pulse light in reverse direction, so that the fourth pulse light, the sixth pulse light and the eighth pulse light are all transmitted to the third 3×3 optical fiber coupler (20) after passing through the fifth optical fiber delay line (7); The first reflector (6) is used to respectively transmit the fifth pulse light, the seventh pulse light and the ninth pulse light in reverse order, so that the fifth pulse light, the seventh pulse light and the ninth pulse light are transmitted to the third 3×3 optical fiber coupler (20) after passing through the sensing optical fiber ring (4), the λ / 4 wave plate (3) and the polarizer (2) in sequence.

9. The passive all-optical current transformer according to claim 8, characterized in that: The third 3×3 optical fiber coupler (20) is used for: The fourth pulse light and the fifth pulse light that are transmitted in opposite directions are coupled to obtain a tenth pulse light, and the tenth pulse light is divided into three paths to obtain a thirteenth pulse light, a fourteenth pulse light and a fifteenth pulse light; and transmitting the thirteenth pulse light through the first optical fiber circulator (13) to the second 3×3 optical fiber coupler (12), transmitting the fourteenth pulse light through the second optical fiber circulator (14) and the third optical fiber delay line (18) in sequence to the second 3×3 optical fiber coupler (12), and transmitting the fifteenth pulse light through the third optical fiber circulator (15) and the fourth optical fiber delay line (19) in sequence to the second 3×3 optical fiber coupler (12); The sixth pulse of light and the seventh pulse of light that are transmitted in opposite directions are coupled to obtain an eleventh pulse of light, and the eleventh pulse of light is divided into three paths to obtain a sixteenth pulse of light, a seventeenth pulse of light, and an eighteenth pulse of light; and transmitting the sixteenth pulse light through the first optical fiber circulator (13) to the second 3×3 optical fiber coupler (12), transmitting the seventeenth pulse light through the second optical fiber circulator (14) and the third optical fiber delay line (18) in sequence to the second 3×3 optical fiber coupler (12), and transmitting the eighteenth pulse light through the third optical fiber circulator (15) and the fourth optical fiber delay line (19) in sequence to the second 3×3 optical fiber coupler (12); The eighth pulse light and the ninth pulse light that are transmitted in reverse are coupled to obtain a twelfth pulse light, and the twelfth pulse light is divided into three paths to obtain a nineteenth pulse light, a twentieth pulse light and a twenty-first pulse light; and the nineteenth pulse light is transmitted to the second 3×3 fiber coupler (12) through the first fiber circulator (13), the twentieth pulse light is transmitted to the second 3×3 fiber coupler (12) after passing through the second fiber circulator (14) and the third fiber delay line (18) in sequence, and the twenty-first pulse light is transmitted to the second 3×3 fiber coupler (12) after passing through the third fiber circulator (15) and the fourth fiber delay line (19) in sequence.

10. The passive all-optical current transformer according to claim 9, characterized in that: The signal processing system (10) comprises: a conversion module, for performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light and the twenty-first pulse of light; a first calculation module, configured to synthesize the intensities of the thirteenth pulse of light, the fourteenth pulse of light, and the fifteenth pulse of light to obtain a first synthesized intensity; synthesize the intensities of the sixteenth pulse of light, the seventeenth pulse of light, and the eighteenth pulse of light to obtain a second synthesized intensity; and synthesize the intensities of the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light to obtain a third synthesized intensity; The second calculation module is used to calculate the current information by using an inverse tangent algorithm based on the first synthesis intensity, the second synthesis intensity and the third synthesis intensity.

11. The passive all-optical current transformer according to claim 10, characterized in that: The signal processing system (10) further comprises: A display module, used for displaying the current information; A saving module is used to save the current information.

12. The passive all-optical current transformer according to claim 4, characterized in that: The sensing optical fiber ring (4) is formed by winding a circular optical fiber.

13. The passive all-optical current transformer according to claim 4, characterized in that: The λ / 4 wave plate (3) is made of elliptical core polarization-maintaining optical fiber and elliptical core polarization-maintaining optical fiber.

14. The passive all-optical current transformer according to claim 10, characterized in that: The calculation formula of the intensity of the pulse light includes: P jk =s j ·r jk ·d k The calculation formulas for the first composite strength, the second composite strength and the third composite strength include: Among them, the calculation formula of the phase characteristics of pulse light includes: In the above formula, P jk is the intensity of the pulsed light, P jk = {P 11 ,P 12 ,P 13 ,P 21 ,P 22 ,P 23 ,P 31 ,P 32 ,P 33 }, P 11 is the intensity of the thirteenth pulse light after being output from the second 3×3 fiber coupler (12), P 12 is the intensity of the fourteenth pulse light after being output from the second 3×3 fiber coupler (12), P 13 is the intensity of the fifteenth pulse light after being output from the second 3×3 fiber coupler (12), P 21 is the intensity of the sixteenth pulse light after being output from the second 3×3 fiber coupler (12), P 22 is the intensity of the seventeenth pulse light after being output from the second 3×3 fiber coupler (12), P 23 is the intensity of the eighteenth pulse light after being output from the second 3×3 fiber coupler (12), P 31 is the intensity of the nineteenth pulse light after being output from the second 3×3 fiber coupler (12), P 32 is the intensity of the twentieth pulse light after being output from the second 3×3 fiber coupler (12), P 33 is the intensity of the twenty-first pulse light after being output from the second 3×3 optical fiber coupler (12); s j is the loss fraction of the optical path before entering the Michelson interferometer, s j ={s1,s2,s3}, s1 is the loss fraction of the optical path before the first pulse light enters the Michelson interferometer, s2 is the loss fraction of the optical path before the second pulse light enters the Michelson interferometer, and s3 is the loss fraction of the optical path before the third pulse light enters the Michelson interferometer; d k is the loss fraction of the optical path through which the pulse light is transmitted from the third 3×3 optical fiber coupler (20) to the second 3×3 optical fiber coupler (12) before being output, d k ={d1, d2, d3}, d1 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 optical fiber coupler (20), the first optical fiber circulator (13) and the second 3×3 optical fiber coupler (12) in sequence and is output, d2 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 optical fiber coupler (20), the second optical fiber circulator (14) and the second 3×3 optical fiber coupler (12) in sequence and is output, and d3 is the loss fraction of the optical path through which the pulse light passes through the third 3×3 optical fiber coupler (20), the third optical fiber circulator (15) and the second 3×3 optical fiber coupler (12) in sequence and is output; ρ jk is the phase characteristic of the pulse light, ρ jk ={ρ 11 ,ρ 12 ,ρ 13 ,ρ 21 ,ρ 22 ,ρ 23 ,ρ 31 ,ρ 32 ,ρ 33 }, ρ 11 is the phase characteristic of the thirteenth pulse light, ρ 12 is the phase characteristic of the fourteenth pulse light, ρ 13 is the phase characteristic of the fifteenth pulse light, ρ 21 is the phase characteristic of the sixteenth pulse light, ρ 22 is the phase characteristic of the seventeenth pulse light, ρ 23 is the phase characteristic of the eighteenth pulse light, ρ 31 is the phase characteristic of the nineteenth pulse light, ρ 32 is the phase characteristic of the twentieth pulse light, ρ 33 is the phase characteristic of the twenty-first pulse light, A is the DC coefficient, B is the cosine coefficient, θ0 is the output phase difference characteristic of the 3×3 fiber coupler, φ is the phase difference generated by the current, P1 is the first synthetic intensity, P2 is the second synthetic intensity, and P3 is the third synthetic intensity.

15. The passive all-optical current transformer according to claim 10, characterized in that: The calculation formula of the current information includes: In the above formula, I is the current information, V is the Verdet constant, N is the number of turns of the sensing optical fiber loop, P1 is the first composite intensity, P2 is the second composite intensity, and P3 is the third composite intensity.

16. A current measurement method based on the passive all-optical current transformer according to any one of claims 1 to 15, characterized in that: include: Utilizing a pulse light source (9) to transmit an optical signal to a multiplexing network structure (1); Using a multiplexing network structure (1) to split the optical signal into three pulse lights, and transmitting the three pulse lights to a Michelson interferometer (21) respectively; and transmitting the three pulse lights that are transmitted in reverse to a signal processing system (10); Using a Michelson interferometer (21) to transmit the three pulse lights in reverse to a multiplexing network structure (1); The signal processing system (10) is used to calculate the current information based on the three pulse lights transmitted in the opposite direction.

17. The method according to claim 16, characterized in that The method of using a multiplexing network structure (1) to divide the optical signal into three pulse lights and transmitting the three pulse lights to a Michelson interferometer (21) respectively comprises: Using a first 3×3 optical fiber coupler (11), the optical signal is divided into three pulse lights to obtain a first pulse light, a second pulse light and a third pulse light, and the first pulse light is transmitted to a third 3×3 optical fiber coupler (20) through a first optical fiber circulator (13), the second pulse light is transmitted to a third 3×3 optical fiber coupler (20) through a second optical fiber circulator (14), and the third pulse light is transmitted to a third 3×3 optical fiber coupler (20) through a third optical fiber circulator (15); The first pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler (20) to obtain a fourth pulse light and a fifth pulse light, and the fourth pulse light is transmitted to a second reflector (8) after passing through a fifth optical fiber delay line (7), and the fifth pulse light is transmitted to a first reflector (6) after passing through a polarizer (2), a λ / 4 wave plate (3) and a sensing optical fiber ring (4) in sequence; The second pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler (20) to obtain a sixth pulse light and a seventh pulse light, and the sixth pulse light is transmitted to a second reflector (8) after passing through a fifth optical fiber delay line (7), and the seventh pulse light is transmitted to a first reflector (6) after passing through a polarizer (2), a λ / 4 wave plate (3) and a sensing optical fiber ring (4) in sequence; The third pulse light is divided into two pulse lights by using a third 3×3 optical fiber coupler (20) to obtain an eighth pulse light and a ninth pulse light, and the eighth pulse light is transmitted to a second reflector (8) after passing through a fifth optical fiber delay line (7), and the ninth pulse light is transmitted to a first reflector (6) after passing through a polarizer (2), a λ / 4 wave plate (3) and a sensing optical fiber ring (4) in sequence.

18. The method according to claim 17, characterized in that The method of using a Michelson interferometer (21) to reversely transmit the three-path pulse light to a multiplexing network structure (1) comprises: The fifth pulse light, the seventh pulse light and the ninth pulse light are respectively transmitted in reverse to the multiplexing network structure (1) by using a first reflector (6); The fourth pulse light, the sixth pulse light and the eighth pulse light are respectively transmitted in reverse to the multiplexing network structure (1) using a second reflector (8).

19. The method according to claim 17, characterized in that The three-path pulse light to be transmitted in reverse is transmitted to a signal processing system (10), comprising: The fourth pulse light and the fifth pulse light that are transmitted in reverse are coupled by a third 3×3 optical fiber coupler (20) to obtain a tenth pulse light, and the tenth pulse light is divided into three paths to obtain a thirteenth pulse light, a fourteenth pulse light and a fifteenth pulse light; and the thirteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) through the first optical fiber circulator (13), the fourteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through the second optical fiber circulator (14) and the third optical fiber delay line (18) in sequence, and the fifteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through the third optical fiber circulator (15) and the fourth optical fiber delay line (19) in sequence; The sixth pulse light and the seventh pulse light that are transmitted in reverse are coupled by a third 3×3 optical fiber coupler (20) to obtain an eleventh pulse light, and the eleventh pulse light is divided into three paths to obtain a sixteenth pulse light, a seventeenth pulse light and an eighteenth pulse light; and the sixteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) through a first optical fiber circulator (13), the seventeenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through a second optical fiber circulator (14) and a third optical fiber delay line (18) in sequence, and the eighteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through a third optical fiber circulator (15) and a fourth optical fiber delay line (19) in sequence; The eighth pulse light and the ninth pulse light that are transmitted in reverse are coupled by a third 3×3 optical fiber coupler (20) to obtain a twelfth pulse light, and the twelfth pulse light is divided into three paths to obtain a nineteenth pulse light, a twentieth pulse light and a twenty-first pulse light; and the nineteenth pulse light is transmitted to the second 3×3 optical fiber coupler (12) through a first optical fiber circulator (13), the twentieth pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through a second optical fiber circulator (14) and a third optical fiber delay line (18) in sequence, and the twenty-first pulse light is transmitted to the second 3×3 optical fiber coupler (12) after passing through a third optical fiber circulator (15) and a fourth optical fiber delay line (19) in sequence.

20. The method according to claim 19, characterized in that The method of using the signal processing system (10) to calculate and obtain current information based on the three pulse lights transmitted in reverse direction comprises: performing photoelectric conversion on the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light, respectively, to obtain the intensities of the thirteenth pulse of light, the fourteenth pulse of light, the fifteenth pulse of light, the sixteenth pulse of light, the seventeenth pulse of light, the eighteenth pulse of light, the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light; synthesizing the intensities of the thirteenth pulse light, the fourteenth pulse light, and the fifteenth pulse light to obtain a first synthesized intensity; synthesizing the intensities of the sixteenth pulse of light, the seventeenth pulse of light, and the eighteenth pulse of light to obtain a second synthesized intensity; synthesizing the intensities of the nineteenth pulse of light, the twentieth pulse of light, and the twenty-first pulse of light to obtain a third synthesized intensity; Based on the first combined intensity, the second combined intensity and the third combined intensity, the current information is calculated using an inverse tangent algorithm.

21. An electronic device, characterized in that: include: at least one processor and memory; The memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the current measuring method according to any one of claims 16 to 20 is implemented.

22. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, the current measurement method according to any one of claims 16 to 20 is implemented.

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