Optical Fiber Probe Current Measurement Device Based on Remote Power Supply Technology

Abstract

The present invention relates to the field of solid-state spin sensing technology. The solution is an optical fiber probe current measurement device based on remote power supply technology, which is used to measure the magnitude of current in a live conductor. It includes a primary loop, a plurality of optical fiber probes, an electromagnetic shielding chamber, insulators, and a secondary cabinet. With the current measurement device using such optical fiber probes, the power consumption requirement for the laser is reduced, so it can be installed at the detection front end and powered by a photovoltaic cell module, which avoids the problems of remote transmission loss and disturbance of short-wave excitation light. In addition, the higher photoluminescence reflection efficiency is sufficient to effectively collect the photoluminescence at the detection back end, without the need to design a corresponding collection structure at the detection front end, relatively reducing the complexity of the fluorescence collection structure.

Description

Technical Field

[0001] The present invention relates to the technical field of quantum precision measurement, and particularly 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 for the detection of magnetic fields, detection methods mainly based on optical detection magnetic resonance (ODMR) have 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 realized. However, some current studies still focus on theory, and many application problems still need to be solved in the process of productizing related technologies.

[0003] The Chinese authorized invention patent with the publication number CN116660604B discloses a quantum transformer based on optical power supply and communication technology, which includes a rear end, a front end, an insulator, and an optical fiber line connected between the front end and the rear end. The insulator is provided with an insulating channel for installing the optical fiber line. The rear end includes a laser module, an optical receiver, and a host. The front end includes an NV color center probe, a photoelectric detection module, an optical transmitter, a photovoltaic cell module, and an optical path module. The solution uses laser power supply to supply power to the detection electrical components on the high-voltage side, and also uses optical fiber communication technology to transmit the fluorescence detection data back from the high-voltage side. Such a system design can make the detection components on the high and low voltage sides have no electrical signal transmission, improving the safety of system use.

[0004] In the above solution, the intensity of photoinduced fluorescence is insufficient. The photoelectric detection module is designed at the front end to sense the photoinduced fluorescence, and finally the fluorescence signal can be transmitted to the rear end with low loss only through optical fiber communication technology. This design complicates the fluorescence collection step. At the same time, the intensity requirement for the excitation light in this solution is relatively high, that is, the power consumption of the laser is large. It is not suitable to be set at the front end to consume the power of the photovoltaic cell, and the short-wave excitation light emitted by the laser set at the rear 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 an optical fiber probe current measurement device based on remote power supply technology. Summary of the Invention

[0005] The present invention proposes an optical fiber probe current measurement 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:

[0007] An optical fiber probe current measurement device based on remote power supply technology, used to measure the magnitude of the current in a current-carrying conductor, includes:

[0008] A primary loop, within whose shell there is a coaxial virtual circumference, and a number of detection mounting positions are evenly distributed on the virtual circumference;

[0009] A number of optical fiber probes, which are respectively mounted on some or all of the detection mounting positions. The optical fiber probes include optical fiber tapers, solidified glass layers and diamond NV centers. The diamond NV centers are included in the solidified glass layers and fixed at the tapered tips of the optical fiber tapers;

[0010] An electromagnetic shielding chamber is arranged at the bottom of the primary loop. It contains a photovoltaic cell module, an excitation light module and a beam splitting optical path. The photovoltaic cell module supplies power to the excitation light module to output excitation light. The excitation light is transmitted through the beam splitting optical path and then enters the optical fiber probe, causing the diamond NV center to generate photoluminescence;

[0011] An insulator is supported and arranged at the bottom of the electromagnetic shielding chamber, and an optical fiber line is installed therein;

[0012] A secondary cabinet contains an energy-supplying laser module, a photoelectric detection module and a host. The energy-supplying laser module outputs energy-supplying laser and transmits it to the photovoltaic cell module through the optical fiber line for charging. The photoluminescence generated by the diamond NV center sequentially enters the photoelectric detection module through the beam splitting optical path and the optical fiber line, and the photoelectric detection module converts the photoluminescence into a detection signal and outputs it to the host.

[0013] For the optical fiber probe current measurement device as described above, in some embodiments of the present application, the solidified glass layer is formed by curing a silsesquioxane photoresist, and the refractive index of the solidified glass layer is lower than the refractive index of the core of the optical fiber taper.

[0014] For the optical fiber probe current measurement device as described above, in some embodiments of the present application, the surface of the solidified glass layer is coated with gold or silver.

[0015] For the optical fiber probe current measurement device as described above, in some embodiments of the present application, it further includes a magnetic concentrator, and the diamond NV center is arranged in the magnetic concentrating air gap of the magnetic concentrator.

[0016] The fiber optic probe current measurement device as described above. In some embodiments of the present application, there are 4n fiber optic probes, where n is a positive integer, and the spacing between adjacent fiber optic probes is the same. Further, the optical splitting optical path includes a number of fiber optic circulators and a fiber optic splitter. The fiber optic splitter divides the excitation light into several paths that are the same as the number of fiber optic probes. The number of fiber optic circulators is the same as the number of fiber optic probes. Each fiber optic circulator includes a first interface connected to the output end of the fiber optic splitter, a second interface connected to the fiber optic probe, and a third interface connected to the fiber optic line. The excitation light enters from the first interface and is output from the second interface to the fiber optic probe. The light returned from the fiber optic probe enters from the second interface and is output from the third interface to the fiber optic line and finally transmitted to the photoelectric detection module.

[0017] The fiber optic probe current measurement device as described above. In some embodiments of the present application, a magnetic shielding ring is also coaxially provided inside the shell of the primary loop, and the diamond NV center is located inside the magnetic shielding ring.

[0018] The fiber optic probe current measurement device as described above. In some embodiments of the present application, a clamping member is provided on the primary loop, and the clamping member is used to fix the energized conductor to be measured and make it coaxial with the primary loop.

[0019] The fiber optic probe current measurement device as described above. In some embodiments of the present application, a microwave antenna is further included on the fiber optic probe. A microwave source electrically connected to the microwave antenna is also provided inside the electromagnetic shielding room, and the microwave source is powered by a photovoltaic cell module. Further, a lock-in amplifier and a first optical carrier transceiver are further included in the secondary cabinet. A second optical carrier transceiver is provided in the electromagnetic shielding room. The lock-in 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 carrier transceiver, the fiber optic line, and the second optical carrier transceiver.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The present invention wraps the diamond NV center inside the silica glass layer at the tip of the fiber optic taper. The structural design of the fiber optic taper 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, improving the reflection efficiency of the photoluminescence. At the same time, compared with the glue that becomes an organic substance after curing used in the prior art, the glass solidified product formed in this solution does not produce impurity fluorescence, improving the electromagnetic field measurement resolution of the diamond nitrogen vacancy color center fiber optic probe.

[0022] The current measurement device using this kind of optical fiber probe has a reduced power consumption requirement for the laser, so it can be set at the front end of the detection and powered by a photovoltaic cell module. This avoids the problems of remote transmission loss and disturbance of short-wave excitation light. In addition, the higher photoinduced fluorescence reflection efficiency is sufficient to effectively collect the photoinduced fluorescence at the back end of the detection, without the need to design a corresponding collection structure at the front end of the detection, relatively reducing the complexity of the fluorescence collection structure. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the current measurement device in Embodiment 1;

[0025] Figure 2 Cross-sectional schematic diagram of the optical fiber probe in Embodiment 1;

[0026] Figure 3 Schematic diagram of the optical fiber probe with a magnetic concentrator in Embodiment 1;

[0027] Figure 4 Schematic diagram of the device connection at the front end of the detection in Embodiment 1;

[0028] Figure 5 Schematic diagram of the optical fiber probe with a microwave antenna in Embodiment 2;

[0029] Figure 6 Schematic diagram of the device connection at the front end of the detection in Embodiment 2;

[0030] Figure 7 Structural schematic diagram of the current measurement device in Embodiment 2. Detailed Embodiments

[0031] The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, rather than to limit the present application.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, one or more embodiments will now be described with reference to the drawings, in which like reference numerals throughout the text are used to refer to like 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 obvious that in various cases, one or more embodiments can be practiced without these specific details, and the various embodiments can be combined and cross-referenced with each other without contradiction.

[0033] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] 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 in diamond, making the NV color center paramagnetic. In addition, the NV color center can also produce fluorescence under light irradiation, so it is of great significance in the optical and electronic applications of diamond; the formation of the NV color center in diamond usually requires certain treatments, such as introducing nitrogen atoms into the diamond lattice by ion implantation or electron beam irradiation, and then annealing at high temperature to combine the nitrogen atoms with adjacent vacancies to form the NV color center. In addition, other impurities and defects in diamond may also affect the properties of the NV color center, so there are relatively high requirements for the purity and crystal quality of diamond.

[0035] Due to the good fluorescence performance and paramagnetism of the NV color center, it has potential application prospects in the fields of biological labeling, quantum information, magnetic imaging, etc. For example, the NV color center can be used as a fluorescent marker for imaging and detection of cells and tissues, and can also be used as a quantum bit for quantum computing and quantum communication. In addition, due to the paramagnetism of the NV color center, it can be used for magnetic imaging and the development of magnetic sensors. Embodiment 1

[0036] See the attached Figure 1 , this embodiment discloses an optical fiber probe current measurement device based on remote power supply technology, which is used to measure the current magnitude in a live conductor, and includes a primary loop 1, several optical fiber probes 2, an electromagnetic shielding chamber 3, an insulator 4 and a secondary cabinet 5.

[0037] In this example, the primary loop 1 contains a coaxial virtual circumference 13 within its shell. A number of detection installation positions are evenly distributed on the virtual circumference 13. The detection installation positions can be set according to needs, and their quantity does not necessarily have to be the same as the quantity of the optical fiber probes 2. There can be multiple detection installation positions, but only an appropriate number of them are selected for installing the optical fiber probes. Regarding the primary loop 1, it is a ring-shaped shell structure, and the material is preferably permalloy. Its inner hole is a placement channel for the energized conductor to be measured. Its shell can be opened and is divided into two front and rear ring-shaped shells. One of the ring-shaped shells is used as a fixed structure and is connected to the electromagnetic shielding chamber, with a small-diameter channel left between them. This ring-shaped shell can be used as the installation area for the optical fiber probes 2 and does not change with the disassembly of the ring-shaped shell. In a preferred structural design, a magnetic shielding ring 11 is also coaxially provided within the shell of the primary loop 1. The diamond NV center 23 is located inside 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 the ring-shaped shell used as the fixed structure.

[0038] Considering that there will be measurement errors if the distances between multiple optical fiber probes 2 and the energized conductor to be measured are inconsistent (although the loop integral algorithm for multiple probes can eliminate this error to a certain extent, the elimination degree is limited and the elimination effect is proportional to the number of probes), a clamping member 12 is provided on the primary loop 1. The clamping member 12 is used to fix the energized conductor to be measured and make it coaxial with the primary loop 1, so that the distances between each optical fiber probe 2 and the energized conductor to be measured are nearly the same, effectively ensuring the measurement accuracy.

[0039] In this example, a number of optical fiber probes 2 are installed one by one corresponding to some or all of the detection installation positions, that is, one optical fiber probe 2 can be placed in one detection installation position for work. Preferably, the number of optical fiber probes 2 is 4n, where n is a positive integer, and the distances between adjacent optical fiber probes are the same. In this way, the measurement error can be eliminated through the loop integral algorithm; see the appendix Figure 2 The optical fiber probe 2 includes an optical fiber taper 21, a cured glass layer 22, and a diamond NV center 23. The diamond NV center 23 is contained within the cured glass layer 22 and fixed at the tapered tip of the optical fiber taper 21. Regarding the definition of the optical fiber taper 21, Figure 2It is shown as a conical structure (which can also be a frustum of a cone) in [description], but due to the inaccurate operation of actual fiber tapering, this cone also includes non-standard conical structures (non-standard frustum of a cone structures). More generally, the design of the cone is mainly to change the angle between the core interface and the cladding interface so that the pumping light can converge after passing through this part, thereby improving the excitation efficiency of the pumping light. Therefore, any structure that can achieve this effect is included in the fiber taper 21 structure pointed out in this article. For the fiber taper 21, it can be a single-mode fiber or a multi-mode fiber. In some preferred designs, it also includes a magnetic concentrator 25, and the diamond NV center 23 is arranged in the magnetic concentrating air gap of the magnetic concentrator 25. See the appendix Figure 3 , and the magnetic concentrator 25 can be a pair of conical magnetic concentrating devices.

[0040] Regarding the cured glass layer 22, its form requirement is not high, but preferably it is a conical structure, which can improve the reflection and collection efficiency of photoluminescence to a certain extent. In some preferred designs, a reflective material such as gold or silver can also be set on the surface of the cured glass layer 22, which enables the photoluminescence to be efficiently reflected and return along the original optical path for collection, and can also promote the pumping light to reflect back and forth at the front end to excite the diamond NV center, improving the excitation efficiency of the pumping light. This application is different from the optical glue that becomes an organic substance after curing in the prior art. When the cured substance is an organic substance, the pumping light irradiating the organic substance will generate impurity fluorescence, and this part of the fluorescence will be collected together with the photoluminescence generated by the diamond NV center, resulting in a decrease in the measurement accuracy of the diamond NV center. This application uses an optical glue with a glass cured substance to connect the optical fiber and the diamond. Since the cured glass layer 22 does not generate fluorescence under the irradiation of the pumping light, it can effectively reduce the influence of stray fluorescence on the measurement accuracy. Further, considering that the existing organic cured substances have poor etching resistance, the glass layer cured substance of the present invention has the characteristic of etching resistance, improving the durability and reliability of the probe, and ensuring stable performance and long-term use under various harsh environmental conditions.

[0041] In addition, the NV center is located inside the diamond, and the fluorescence generated by it will undergo total internal reflection at the interface between the diamond and the air. Excessive total internal reflection will cause energy loss of the photoluminescence. In this solution, the air is replaced with the cured 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 at the diamond-cured photoresist glass layer interface is worse, and the photoluminescence is more likely to transmit out of the diamond, thereby effectively improving the photoluminescence collection efficiency. In addition, combined with the appendix Figure 2In reality, we select diamond containing NV centers (with a particle size of 10 nm - 500 nm), which is still relatively small compared to the core diameter of the fiber taper 21. Most of the fluorescence directly enters the fiber through the end face of the core for transmission. To avoid total internal reflection at the interface when the photoluminescence enters the core, in a preferred solution, the refractive index of the cured glass layer 22 is designed to be lower than that of the core of the fiber taper 21, so that the conditions for total internal reflection can be destroyed.

[0042] In this example, the cured glass layer 22 is formed by curing a silsesquioxane photoresist. Regarding the process of curing the silsesquioxane photoresist, in a specific implementation case, high-energy electrons or photons are used to cure the silsesquioxane photoresist, and its dose is 400 µC / cm 2 -2000 µC / cm 2 , and the energy is 50 keV - 100 keV; the cured silsesquioxane photoresist changes from a liquid to a silica glass layer (i.e., the cured glass layer 22), and the diamond containing NV centers is fixed at the tip of the fiber taper.

[0043] In this example, the electromagnetic shielding chamber 3 is arranged at the bottom of the primary loop 2. See the appendix Figure 4 , which contains a photovoltaic cell module 31, an excitation light module 32, and a splitting optical path. The photovoltaic cell module 31 supplies power to the excitation light module 32 to output excitation light. The excitation light is transmitted through the splitting optical path and then enters the fiber probe 2, causing the diamond NV centers 23 to generate photoluminescence; for a general fiber-type diamond NV center probe, a relatively large light intensity of the excitation light is required, and the corresponding power consumption of the excitation light laser is large, and the pressure for powering it with the photovoltaic cell module 31 is large. The fiber probe 2 in this solution has a high utilization rate of the excitation light, so a low-power laser can be used to output the excitation light. At this time, the excitation light module 32 can be arranged at the detection front end. This design can also effectively reduce the long-distance transmission loss and disturbance problems of the short-wave excitation light. In addition, the fiber probe 2 has a higher photoluminescence reflection efficiency, which is sufficient to effectively collect the photoluminescence at the detection back end without designing a corresponding collection structure at the detection front end, relatively reducing the complexity of the fluorescence collection structure; regarding the splitting optical path, in a preferred design, it includes several fiber circulators 34 and a fiber splitter 33. The fiber splitter 33 divides the excitation light into several paths with the same 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 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 returned from the fiber probe 2 enters from the second interface and is output from the third interface to the fiber line 41 and finally transmitted to the photoelectric detection module 51; in one case, see the appendix Figure 4, which has four optical fiber probes 2, is equipped with four optical fiber circulators 34 and a 1 / 4 optical fiber beam splitter 33. The circuit connection mode is as shown in the figure and will not be elaborated here.

[0044] In this example, the insulator 4 is supported at the bottom of the electromagnetic shielding chamber 3, and an optical fiber line 41 is installed therein; the type of the insulator 4 can be various, and it should be noted that the structure here Figure 1 is not a limitation to it; the optical fiber line 41 is a combination of multiple optical fibers, similar to an optical cable. In this example, it at least includes two optical fibers for transmitting the pumping laser and transmitting the photoluminescence.

[0045] In this example, the secondary cabinet 5 includes a pumping laser module 52, a photoelectric detection module 51 and a host 53. The pumping laser module 52 outputs the pumping laser, and transmits it to the photovoltaic cell 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 spectroscopic optical path and the optical fiber line 41 in sequence. 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. The filter filters out the pumping light and stray light from the transmitted optical signal, so that the pure photoluminescence is filtered out and then sensed by the photodetector and converted into an electrical signal. Embodiment 2

[0046] The above embodiment provides a current measurement device based on the all-optical method. This example further proposes a current measurement device based on the optically detected magnetic resonance (ODMR) method. Refer to the appendix Figure 5 , and 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 microstrip antennas; refer to the appendix Figure 6 , and a microwave source 35 electrically connected to the microwave antenna 21 is also provided in the electromagnetic shielding chamber 3. The microwave source 35 is powered by the photovoltaic cell module 31.

[0047] In some solutions, a lock-in amplifier is selected to synchronously control the microwave source and the photodetector. However, the lock-in amplifier is not suitable for being placed in the electromagnetic shielding chamber 3 at the detection front end and can only be placed in the secondary cabinet 5 at the rear side. In this way, there will be a problem of transmitting electrical signals between the front and rear ends of the detection, which is not suitable for detection in the UHV environment. To solve this problem, in a preferred design, refer to the appendix Figure 7, the secondary cabinet 5 further includes a lock-in amplifier 54 and a first optical carrier transceiver 55. The electromagnetic shielding chamber 3 is provided with a second optical carrier transceiver 36. The lock-in amplifier 54 is electrically connected to the photoelectric detection module 51 and the host 53 through wires respectively, and is connected to the microwave source 35 through a transmission channel composed of the first optical carrier transceiver 55, the optical fiber line 41 and the second optical carrier transceiver 36. The electrical signal to be transmitted to the microwave source 35 is first converted into an optical carrier microwave signal by the first optical carrier transceiver 55, which is transmitted to the second optical carrier transceiver 36 through the optical fiber line 41, and is restored into an electrical signal by the second optical carrier transceiver 36 and then output to the microwave source 35. This design thus avoids the problem of transmitting electrical signals at the front and back ends of the detection.

[0048] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0049] 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 present invention to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification. The present 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 well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A fiber optic probe current measurement device based on remote power supply technology, which is used to measure the magnitude of current in a live conductor, is characterized in that, Comprising: A primary loop, within whose shell there is a coaxial virtual circumference, and a number of detection mounting positions are evenly distributed on the virtual circumference; A number of optical fiber probes, which are respectively mounted on some or all of the detection mounting positions. The optical fiber probes include optical fiber tapers, cured glass layers and diamond NV color centers. The diamond NV color centers are contained within the cured glass layers and fixed at the tapered tips of the optical fiber tapers. The cured glass layers are formed by curing silicone sesquioxane photoresist, and the refractive index of the cured glass layers is lower than that of the cores of the optical fiber tapers; An electromagnetic shielding chamber is provided at the bottom of the primary loop, and it contains a photovoltaic cell module, an excitation light module and a splitting optical path. The photovoltaic cell module supplies power to the excitation light module to output excitation light. The excitation light is transmitted through the splitting optical path and then enters the optical fiber probe, causing the diamond NV color center to generate photoluminescence; An insulator is supported at the bottom of the electromagnetic shielding chamber, and an optical fiber line is installed therein; A secondary cabinet contains an energy supply laser module, a photoelectric detection module and a host computer. The energy supply laser module outputs energy supply laser, and transmits it through the optical fiber line to the photovoltaic cell module for charging. The photoluminescence generated by the diamond NV color center sequentially passes through the splitting optical path and the optical fiber line and enters the photoelectric detection module. The photoelectric detection module converts the photoluminescence into a detection signal and outputs it to the host computer.

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

3. The fiber optic probe current measurement device based on remote power supply technology according to claim 1, characterized in that, It further includes a magnetic concentrator, and the diamond NV color center is placed in the magnetic concentrating air gap of the magnetic concentrator.

4. The fiber optic 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 spacing between adjacent optical fiber probes is the same.

5. The fiber optic probe current measurement device based on remote power supply technology according to claim 4, characterized in that, The splitting optical path includes a number of optical fiber circulators and an optical fiber splitter. The optical fiber splitter divides the excitation light into several paths equal to the number of optical fiber probes. The number of optical fiber circulators is the same as the number of optical fiber probes. Each optical fiber circulator includes a first interface connected to the output end of the optical fiber splitter, a second interface connected to the optical fiber 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 optical fiber probe. The light returned from the optical fiber probe enters from the second interface and is output from the third interface to the optical fiber line, and finally transmitted to the photoelectric detection module.

6. The fiber optic probe current measurement device based on remote power supply technology according to claim 1, characterized in that, A magnetic shielding ring is also coaxially provided within the shell of the primary loop, and the diamond NV color center is located inside the magnetic shielding ring.

7. The fiber-optic probe current measurement device based on remote power supply technology according to claim 1, characterized in that A clamping member is provided on the primary loop, and the clamping member is used to fix the energized conductor to be measured and make it coaxial with the primary loop.

8. The fiber optic probe current measurement device based on remote power supply technology according to claim 1, characterized in that, The optical fiber probe further includes a microwave antenna, and a microwave source electrically connected to the microwave antenna is also provided within the electromagnetic shielding chamber. The microwave source is powered by the photovoltaic cell module.

9. The fiber optic probe current measurement device based on remote power supply technology according to claim 8, characterized in that, The secondary cabinet further contains a lock-in amplifier and a first optical carrier transceiver. The electromagnetic shielding chamber is provided with a second optical carrier transceiver. The lock-in amplifier is electrically connected to the photoelectric detection module and the host computer through wires respectively, and is connected to the microwave source through a transmission channel composed of the first optical carrier transceiver, the optical fiber line and the second optical carrier transceiver.

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