Optical fiber probe current measurement equipment based on remote energy supply technology

Abstract

The invention relates to the technical field of solid-state spin sensing, in particular to optical fiber probe current measuring equipment based on a remote energy supply technology, which is used for measuring the magnitude of current in an electrified conductor and comprises a primary ring, a plurality of optical fiber probes, an electromagnetic shielding chamber, an insulator and a secondary cabinet, the current measurement equipment using the optical fiber probe reduces the power consumption demand of a laser, so that the current measurement equipment can be arranged at the detection front end and is powered by a photocell module, the problems of short-wave excitation light remote transmission loss and disturbance are avoided, in addition, the higher photoinduced fluorescence reflection efficiency is realized, and the detection accuracy is improved. The photoluminescence can be effectively collected at the detection rear end, a corresponding collection structure does not need to be designed at the detection front end, and the complexity of a fluorescence collection structure is relatively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of quantum precision measurement, and in particular to an optical fiber probe current measurement device based on remote power supply technology. Background Art

[0002] In recent years, the research on solid-state spin color center systems in the field of quantum precision has developed rapidly, especially in the detection of magnetic fields. A detection method based on optical detection magnetic resonance (ODMR) has been developed. By studying the linear relationship between the magnetic resonance frequency and the external magnetic field, the sensing measurement and quantification of the external magnetic field can be achieved. However, some current research is still biased towards theory, and many application problems still need to be solved in the process of productization of related technologies.

[0003] The Chinese authorized invention patent with publication number CN116660604B discloses a quantum mutual inductor based on optical power supply and communication technology, which includes a back end, a front end, an insulator and an optical fiber line connected between the front end and the back end. The insulator is provided with an insulating channel for installing the optical fiber line. The back end includes a laser module, an optical receiver and a host, and the front end includes an NV color center probe, a photoelectric detection module, an optical transmitter, a photocell module and an optical path module. The scheme uses laser power supply to power the detection electrical devices on the high-voltage side, and also uses optical fiber communication technology to transmit fluorescence detection data back from the high-voltage side. This system design can eliminate the transmission of electrical signals between the detection components on the high and low voltage sides, thereby improving the safety of system use.

[0004] In the above scheme, due to the insufficient intensity of photofluorescence, a photoelectric detection module is designed at the front end to sense the photofluorescence and finally transmit the fluorescence signal to the back end with low loss through optical fiber communication technology. This design complicates the fluorescence collection step. At the same time, the scheme has a high demand for the intensity of the excitation light, that is, the laser power consumption is large, and it is not suitable to be set at the front end to consume the power of the photocell. The short-wave excitation light emitted by the laser at the back end has large losses and disturbances in long-distance transmission, which will affect the measurement accuracy of the diamond NV color center. Based on this, the present invention designs a fiber optic probe current measurement device based on remote power supply technology. Summary of the invention

[0005] The present invention proposes an optical fiber probe current measuring device based on remote power supply technology to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: An optical fiber probe current measuring device based on remote power supply technology, used to measure the current in a powered conductor, comprising: A primary ring, wherein the shell includes a coaxial virtual circumference, and a plurality of detection installation positions are evenly distributed on the virtual circumference; A plurality of optical fiber probes, which are installed in a one-to-one correspondence at some or all detection installation positions, wherein the optical fiber probes include an optical fiber cone, a solidified glass layer and a diamond NV color center, wherein the diamond NV color center is contained in the solidified glass layer and fixed to the tapered tip of the optical fiber cone; The electromagnetic shielding room is arranged at the bottom of the primary ring, and contains a photocell module, an excitation light module and a split light path. The photocell module supplies power to the excitation light module to output excitation light. The excitation light enters the optical fiber probe after being transmitted through the split light path, and causes the diamond NV color center to generate photoluminescence. An insulator, supported and arranged at the bottom of the electromagnetic shielding room, in which an optical fiber line is installed; The secondary cabinet includes a power supply laser module, a photoelectric detection module and a host. The power supply laser module outputs a power supply laser and transmits it to the photocell module through the optical fiber line to charge it. The photoluminescence generated by the diamond NV color center enters the photoelectric detection module through the split light path and the optical fiber line in turn. The photoelectric detection module converts the photoluminescence into a detection signal and outputs it to the host.

[0007] In the optical fiber probe current measurement device as described above, in some embodiments of the present application, the cured glass layer is formed by curing silsesquioxane photoresist, and the refractive index of the cured glass layer is lower than the refractive index of the core of the optical fiber cone.

[0008] As described above, in the optical fiber probe current measurement device, in some embodiments of the present application, the surface of the solidified glass layer is plated with gold or silver.

[0009] The optical fiber probe current measurement device as described above, in some embodiments of the present application, further comprises a magnetic concentrator, and the diamond NV color center is disposed in a magnetic concentrator air gap of the magnetic concentrator.

[0010] In the fiber optic probe current measurement device as described above, in some embodiments of the present application, the fiber optic probes are 4n, n is a positive integer, and the spacing between adjacent fiber optic probes is the same. Further, the light splitting path includes a plurality of fiber optic circulators and a fiber optic beam splitter, the fiber optic beam splitter divides the excitation light into a plurality of paths consistent with the number of fiber optic probes, the number of fiber optic circulators is consistent with the number of fiber optic probes, each fiber optic circulator includes a first interface connected to the output end of the fiber optic beam splitter, a second interface connected to the fiber optic probe, and a third interface connected to the optical fiber line, the excitation light enters from the first interface and is output from the second interface to the fiber optic probe, the light transmitted back from the fiber optic probe enters from the second interface and is output from the third interface to the optical fiber line, and is finally transmitted to the photoelectric detection module.

[0011] As described above, in some embodiments of the present application, the optical fiber probe current measurement device is further coaxially provided with a magnetic shielding ring inside the shell of the primary ring, and the diamond NV color center is located on the inner side of the magnetic shielding ring.

[0012] In the optical fiber probe current measurement device as described above, in some embodiments of the present application, a clamp is provided on the primary ring, and the clamp is used to fix the current-carrying conductor to be measured and make it coaxial with the primary ring.

[0013] In the optical fiber probe current measurement device as described above, in some embodiments of the present application, the optical fiber probe also includes a microwave antenna, and a microwave source electrically connected to the microwave antenna is also provided in the electromagnetic shielding room, and the microwave source is powered by a photoelectric cell module; further, the secondary cabinet also includes a phase-locked amplifier and a first optical transmitter-receiver, and the electromagnetic shielding room is provided with a second optical transmitter-receiver, and the phase-locked amplifier is electrically connected to the photoelectric detection module and the host computer through wires, and is connected to the microwave source through a transmission channel composed of the first optical transmitter-receiver, the optical fiber line and the second optical transmitter-receiver.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention wraps the diamond NV color center inside the silica glass layer at the tip of the optical fiber cone. The structural design of the optical fiber cone improves the excitation effect of the excitation light, and the coated glass layer also avoids the disadvantage that the photoluminescence cannot be effectively collected due to the total reflection effect, thereby improving the reflection efficiency of the photoluminescence. At the same time, compared with the glue used in the prior art that is an organic substance after curing, the glass cured product formed by the present solution does not generate impurity fluorescence, thereby improving the electromagnetic field measurement resolution of the diamond nitrogen vacancy color center optical fiber probe. The current measurement device using this type of optical fiber probe has a lower power consumption requirement for the laser, so it can be installed at the detection front end and powered by a photocell module, which avoids the loss and disturbance problems of short-wave excitation light in long-distance transmission. In addition, the higher photofluorescence reflection efficiency is sufficient to complete the effective collection of photofluorescence at the detection back end, without the need to design a corresponding collection structure at the detection front end, which relatively reduces the complexity of the fluorescence collection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 is a schematic structural diagram of a current measuring device in Embodiment 1; Figure 2 is a schematic cross-sectional view of the optical fiber probe in Example 1; Figure 3 is a schematic diagram of an optical fiber probe with a magnetic concentrator in Example 1; Figure 4 This is a schematic diagram of the device connection of the detection front end in Example 1; Figure 5 is a schematic diagram of an optical fiber probe with a microwave antenna in Example 2; Figure 6 This is a schematic diagram of the device connection of the detection front end in Example 2; Figure 7 It is a structural schematic diagram of the current measuring device in the second embodiment. DETAILED DESCRIPTION

[0017] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0018] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, one or more embodiments are now described with reference to the accompanying drawings, wherein similar reference numerals throughout the text are used to refer to similar components. In the following description, for the purpose of explanation, many specific details are set forth in order to provide a more thorough understanding of one or more embodiments. However, it is clear that in various cases, one or more embodiments can be practiced without these specific details, and the various embodiments can be combined and referenced to each other without contradiction.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] The NV (nitrogen-vacancy) color center in diamond is a common defect, which consists of a nitrogen atom and an adjacent vacancy (i.e., a missing carbon atom). This structure introduces an unpaired electron into the diamond, making the NV color center paramagnetic. In addition, the NV color center can also produce fluorescence under the irradiation of light, so it is of great significance in the optical and electronic applications of diamond; the formation of NV color centers in diamond usually requires certain treatments, such as introducing nitrogen atoms into the diamond lattice through ion implantation or electron beam irradiation, and then high-temperature annealing treatment to combine the nitrogen atoms with adjacent vacancies to form NV color centers. In addition, other impurities and defects in diamond may also affect the properties of NV color centers, so there are high requirements for the purity and crystal quality of diamond.

[0021] Since NV centers have good fluorescence properties and paramagnetism, they have potential application prospects in the fields of biomarkers, quantum information, magnetic imaging, etc. For example, NV centers can be used as fluorescent markers for imaging and detection of cells and tissues, and can also be used as quantum bits for quantum computing and quantum communication. In addition, due to the paramagnetism of NV centers, they can be used for magnetic imaging and the development of magnetic sensors. Embodiment 1

[0022] See attached Figure 1 This embodiment discloses a fiber optic probe current measuring device based on remote power supply technology, which is used to measure the current in a conductor carrying power, and includes a primary ring 1, a plurality of fiber optic probes 2, an electromagnetic shielding room 3, an insulator 4 and a secondary cabinet 5.

[0023] In this example, the primary ring 1 contains a coaxial virtual circle 13 in its shell, and a number of detection installation positions are evenly distributed on the virtual circle 13. The detection installation positions can be set according to needs, and the number is not required to be consistent with the number of optical fiber probes 2. There can be multiple detection installation positions, but only a suitable number of them are selected to install the optical fiber probes; Regarding the primary ring 1, it is an annular shell structure, and the material is preferably Permalloy. Its inner hole is a placement channel for the current-carrying conductor to be measured. Its shell can be opened and divided into two front and rear annular shells, one of which is connected to the electromagnetic shielding room as a fixed structure, and a small aperture channel is left between the two. The annular shell can be used as an installation area for the optical fiber probe 2 and does not change with the disassembly of the annular shell; in a preferred structural design, a magnetic shielding ring 11 is also coaxially provided in the shell of the primary ring 1, and the diamond NV color center 23 is located on the inner side of the magnetic shielding ring 11. The magnetic shielding ring 11 can effectively reduce the influence of the external magnetic field on the measurement accuracy. Generally, the magnetic shielding ring 11 can be installed in an annular shell as a fixed structure.

[0024] Taking into account that if the distances between multiple optical fiber probes 2 and the current-carrying conductor to be measured are inconsistent, there will be measurement errors (although the loop integration algorithm of the multiple probes can eliminate the error to a certain extent, the degree of elimination is limited, and the elimination effect is proportional to the number of probes), a clamping member 12 is provided on the primary ring 1, and the clamping member 12 is used to fix the current-carrying conductor to be measured and make it coaxial with the primary ring 1, so that the distances between each optical fiber probe 2 and the current-carrying conductor to be measured are almost consistent, effectively ensuring the measurement accuracy.

[0025] In this example, a plurality of optical fiber probes 2 are installed in a one-to-one correspondence at some or all detection installation positions, that is, one optical fiber probe 2 can be placed at one detection installation position for operation. Preferably, the number of optical fiber probes 2 is 4n, where n is a positive integer and the spacing between adjacent optical fiber probes is the same, so that the measurement error can be eliminated by the loop integration algorithm; see the attached Figure 2 The optical fiber probe 2 comprises an optical fiber cone 21, a solidified glass layer 22 and a diamond NV color center 23, wherein the diamond NV color center 23 is contained in the solidified glass layer 22 and fixed to the conical tip of the optical fiber cone 21; with respect to the definition of the optical fiber cone 21, Figure 2 It is shown as a conical structure (it can also be a truncated cone), but the actual optical fiber taper operation is inaccurate. The cone also includes a non-standard conical structure (non-standard truncated cone structure). More generally, the cone is designed mainly to change the angle between the core interface and the cladding interface so that the excitation light can converge after passing through this part, thereby improving the excitation efficiency of the excitation light. Therefore, the structure that meets this effect is included in the optical fiber cone 21 structure pointed out in this article; for the optical fiber cone 21, it can be a single-mode optical fiber or a multi-mode optical fiber; in some preferred designs, it also includes a magnetic concentrator 25, and the diamond NV color center 23 is placed in the magnetic air gap of the magnetic concentrator 25, see Appendix Figure 3 The magnetic concentrator 25 can be a pair of conical magnetic concentrators.

[0026] Regarding the cured glass layer 22, its shape requirements are not high, but it is preferably a conical structure, which can improve the reflection and collection efficiency of photoluminescence to a certain extent; in some preferred designs, reflective materials such as gold, silver, etc. can also be set on the surface of the cured glass layer 22, which enables the photoluminescence to be efficiently reflected back along the original light path and thus collected, and can also promote the excitation light to reflect back and forth at the front end to excite the diamond NV color center, thereby improving the excitation light excitation efficiency; the present application is different from the optical glue used in the prior art that is an organic matter after curing. When the cured material is an organic matter, the excitation light irradiating the organic matter will produce impurity fluorescence, and this part of the fluorescence will be collected together with the photoluminescence generated by the diamond NV color center, thereby reducing the measurement accuracy of the diamond NV color center. The present application uses an optical glue whose cured material is glass to connect the optical fiber and diamond. Since the cured glass layer 22 does not produce fluorescence under the irradiation of the excitation light, the influence of stray fluorescence on the measurement accuracy can be greatly reduced. Furthermore, considering that existing organic solids have poor etching resistance, the etching resistance of the glass layer solid of the present invention improves the durability and reliability of the probe, ensuring stable performance and long-term use under various harsh environmental conditions.

[0027] In addition, the NV color center is located in the diamond, and the fluorescence it produces will be totally internally reflected at the interface between diamond and air. Excessive total internal reflection will lead to energy loss of photoluminescence. In this solution, the air is replaced by a solidified glass layer 22, which has a higher refractive index than air. Compared with the total reflection effect of fluorescence at the diamond-air interface, the total reflection effect of the latter at the interface of diamond-photoresist solidified glass layer is worse, and the photoluminescence is more likely to be transmitted from the diamond, thereby effectively improving the photoluminescence collection efficiency. In addition, combined with the attached Figure 2 In accordance with the reality, we choose diamond containing NV color center (particle size is 10nm-500nm), which is relatively small compared to the core diameter of the optical fiber cone 21. Most of the fluorescence enters the optical fiber directly from the end face of the core for transmission. In order to avoid total interface reflection when the photofluorescence enters the core, in a preferred embodiment, the refractive index of the cured glass layer 22 is designed to be lower than the refractive index of the core of the optical fiber cone 21, so as to destroy the conditions for total reflection.

[0028] In this example, the cured glass layer 22 is formed by curing silsesquioxane photoresist. Regarding the process of curing silsesquioxane photoresist, in a specific implementation case, high-energy electrons or photons are used to cure the silsesquioxane photoresist at a dosage of 400 µC / cm 2 -2000 µC / cm 2 , energy 50keV-100keV; the solidified silsesquioxane photoresist changes from liquid to a silica glass layer (ie, solidified glass layer 22), fixing the diamond containing the NV color center at the tip of the optical fiber cone.

[0029] In this example, the electromagnetic shielding room 3 is arranged at the bottom of the primary ring 2. Figure 4 , which contains a photocell module 31, an excitation light module 32 and a splitter optical path. The photocell module 31 supplies power to the excitation light module 32 to output excitation light. The excitation light enters the optical fiber probe 2 after being transmitted through the splitter optical path, and causes the diamond NV color center 23 to produce photoluminescence. For a general optical fiber diamond NV color center probe, a higher intensity of excitation light is required, and the corresponding excitation light laser consumes more power. The pressure of using the photocell module 31 to power it is relatively high. The optical fiber probe 2 of this scheme has a high utilization rate of excitation light, so a low-power laser can be used to output excitation light. At this time, the excitation light module 32 can be set at the detection front end. This design can also effectively reduce the long-distance transmission loss and disturbance problems of short-wave excitation light. In addition, the optical fiber probe 2 has a higher photoluminescence reflection efficiency, which is sufficient to complete the detection at the back end. For the effective collection of photofluorescence, there is no need to design a corresponding collection structure at the detection front end, which relatively reduces the complexity of the fluorescence collection structure. Regarding the splitting optical path, the preferred design includes a plurality of fiber circulators 34 and a fiber beam splitter 33. The fiber circulator 33 divides the excitation light into a plurality of paths that are the same in number as the fiber probes 2. The number of fiber circulators 34 is the same as the number of fiber probes 2. Each fiber circulator 34 includes a first interface connected to the output end of the fiber beam splitter 33, a second interface connected to the fiber probe 2, and a third interface connected to the fiber line 41. The excitation light enters from the first interface and is output from the second interface to the fiber probe 2. The light transmitted back from the fiber probe 2 enters from the second interface and is output from the third interface to the fiber line 41, and is finally transmitted to the photoelectric detection module 51. In a case, see Attachment 1. Figure 4 It has four optical fiber probes 2, and is equipped with four optical fiber circulators 34 and a 1 / 4 optical fiber beam splitter 33. The line connection method is shown in the figure and will not be repeated here.

[0030] In this example, the insulator 4 is supported at the bottom of the electromagnetic shielding room 3, and an optical fiber line 41 is installed therein; the insulator 4 can be of various types. Figure 1 The structure is not limited thereto; the optical fiber line 41 is a combination of multiple optical fibers, similar to an optical cable, and in this example, it includes at least two optical fibers for transmitting power laser and transmitting photoluminescence.

[0031] In this example, the secondary cabinet 5 includes a power supply laser module 52, a photoelectric detection module 51 and a host 53. The power supply laser module 52 outputs a power supply laser and transmits it to the photocell module 31 through the optical fiber line 41 to charge it. The photoluminescence generated by the diamond NV color center 23 enters the photoelectric detection module 51 through the split light path and the optical fiber line 41 in turn. The photoelectric detection module 51 converts the photoluminescence into a detection signal and outputs it to the host. Preferably, the photoelectric detection module 51 includes a filter and a photodetector, and the filter is used to filter out the excitation light and stray light from the transmitted light signal, so that the pure photoluminescence is filtered out and then sensed by the photodetector and converted into an electrical signal. Embodiment 2

[0032] The above embodiment provides a current measurement device based on an all-optical method. This embodiment further provides a current measurement device based on an optical detection magnetic resonance method (ODMR). Figure 5 The optical fiber probe 21 also includes a microwave antenna 26. The microwave antenna shown in the figure is a wound copper coil, but it can actually be other structures, as well as various types of microstrip antennas; see the attached Figure 6 A microwave source 35 electrically connected to the microwave antenna 21 is also provided in the electromagnetic shielding room 3 , and the microwave source 35 is powered by the photovoltaic cell module 31 .

[0033] In some schemes, a phase-locked amplifier is used to synchronously control the microwave source and the photoelectric detector. However, the phase-locked amplifier is not suitable for being placed in the electromagnetic shielding room 3 at the front end of the detection, and can only be placed in the secondary cabinet 5 at the rear side. In this way, there will be a problem of electrical signals being transmitted before and after the detection, which is not suitable for detection in an ultra-high voltage environment. In order to solve this problem, in a preferred design, see the attached Figure 7 The secondary cabinet 5 also includes a phase-locked amplifier 54 and a first optical transmitter-receiver 55. The electromagnetic shielding room 3 is provided with a second optical transmitter-receiver 36. The phase-locked amplifier 54 is electrically connected to the photoelectric detection module 51 and the host 53 through wires, and is connected to the microwave source 35 through a transmission channel composed of the first optical transmitter-receiver 55, the optical fiber line 41 and the second optical transmitter-receiver 36. The electrical signal to be transmitted to the microwave source 35 is first converted into an optical microwave signal by the first optical transmitter-receiver 55, which is transmitted to the second optical transmitter-receiver 36 through the optical fiber line 41, and then output to the microwave source 35 after being deconstructed into an electrical signal by the second optical transmitter-receiver 36. This design avoids the problem of transmitting electrical signals before and after the detection.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fiber optic probe current measuring device based on remote power supply technology, used to measure the current in a conductor carrying electricity, characterized in that: Include: A primary ring, wherein the shell includes a coaxial virtual circumference, and a plurality of detection installation positions are evenly distributed on the virtual circumference; A plurality of optical fiber probes, which are installed in a one-to-one correspondence at some or all detection installation positions, wherein the optical fiber probes include an optical fiber cone, a solidified glass layer and a diamond NV color center, wherein the diamond NV color center is contained in the solidified glass layer and fixed to the tapered tip of the optical fiber cone; The electromagnetic shielding room is arranged at the bottom of the primary ring, and contains a photocell module, an excitation light module and a split light path. The photocell module supplies power to the excitation light module to output excitation light. The excitation light enters the optical fiber probe after being transmitted through the split light path, and causes the diamond NV color center to generate photoluminescence. An insulator, supported and arranged at the bottom of the electromagnetic shielding room, in which an optical fiber line is installed; The secondary cabinet includes a power supply laser module, a photoelectric detection module and a host. The power supply laser module outputs a power supply laser and transmits it to the photocell module through the optical fiber line to charge it. The photoluminescence generated by the diamond NV color center enters the photoelectric detection module through the split light path and the optical fiber line in turn. The photoelectric detection module converts the photoluminescence into a detection signal and outputs it to the host.

2. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: The cured glass layer is formed by curing silsesquioxane photoresist, and the refractive index of the cured glass layer is lower than the refractive index of the core of the optical fiber cone.

3. The optical fiber probe current measurement device based on remote power supply technology according to claim 1 or 2, characterized in that: The surface of the solidified glass layer is plated with gold or silver.

4. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: It also includes a magnetic concentrator, and the diamond NV color center is arranged in the magnetic concentrator air gap.

5. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: The number of the optical fiber probes is 4n, where n is a positive integer, and the intervals between adjacent optical fiber probes are the same.

6. The optical fiber probe current measurement device based on remote power supply technology according to claim 5, characterized in that: The splitting optical path includes a plurality of fiber circulators and a fiber beam splitter. The fiber beam splitter divides the excitation light into a plurality of paths that are consistent with the number of fiber probes. The number of fiber circulators is consistent with the number of fiber probes. Each fiber circulator includes a first interface connected to the output end of the fiber beam splitter, a second interface connected to the fiber probe, and a third interface connected to the fiber line. The excitation light enters from the first interface and is output from the second interface to the fiber probe. The light transmitted back from the fiber probe enters from the second interface and is output from the third interface to the fiber line, and is finally transmitted to the photoelectric detection module.

7. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: A magnetic shielding ring is also coaxially arranged inside the shell of the primary ring, and the diamond NV color center is located on the inner side of the magnetic shielding ring.

8. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: The primary ring is provided with a clamping piece, and the clamping piece is used to fix the current-carrying conductor to be tested and make it coaxial with the primary ring.

9. The optical fiber probe current measurement device based on remote power supply technology according to claim 1, characterized in that: The optical fiber probe also includes a microwave antenna. The electromagnetic shielding room also includes a microwave source electrically connected to the microwave antenna. The microwave source is powered by a photocell module.

10. The optical fiber probe current measurement device based on remote power supply technology according to claim 9, characterized in that: The secondary cabinet also includes a phase-locked amplifier and a first optical transmitter-receiver. The electromagnetic shielding room is provided with a second optical transmitter-receiver. The phase-locked amplifier is electrically connected to the photoelectric detection module and the host through wires, and is connected to the microwave source through a transmission channel composed of the first optical transmitter-receiver, the optical fiber line and the second optical transmitter-receiver.

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