Current measurement method and device based on NV color center, electronic equipment, storage medium and computer program product

Abstract

The invention provides a current measurement method and device based on an NV color center, electronic equipment, a storage medium and a computer program product, and relates to the technical field of quantum sensing measurement. The current measurement method comprises the following steps: exciting an NV color center based on a laser signal; applying a microwave signal with a fixed frequency to the NV color center; the relative distance between the NV color center and the wire to be measured is adjusted until magnetic resonance occurs between the microwave signal with the fixed frequency and the spin energy level of the NV color center; and under the condition of magnetic resonance, current information of the to-be-detected wire is determined according to the relative distance between the NV color center and the to-be-detected wire. Resonance conditions can be matched by adjusting the position of the NV color center (namely, the mode of changing the magnetic field) based on the fixed microwave frequency, and the problem of measurement errors caused by difference of the microwave frequency can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of quantum sensing measurement. Specifically, the present invention relates to a method and device for measuring current based on NV centers, an electronic device, a storage medium, and a computer program product. Background Art

[0002] The diamond nitrogen-vacancy center (NV: Nitrogen vacancy, hereinafter referred to as NV center) is a structure composed of a nitrogen atom substituting for a carbon atom position in the diamond lattice and an adjacent lattice vacancy. Due to its unique optical and spin properties, the NV center has important application potential in the fields of quantum information processing and quantum sensing technology.

[0003] By using a laser to excite the NV center, it can be transitioned from the ground state to the excited state, and then return to the ground state through fluorescence emission. During this process, if a microwave signal matching the transition frequency of the ground state spin energy level is applied, the NV center will undergo magnetic resonance, resulting in a significant change in fluorescence intensity. By detecting the change in fluorescence intensity, a magnetic resonance signal can be obtained, thereby enabling the detection of an external magnetic field. For example, according to the Zeeman effect, an external magnetic field will cause the spin energy levels of the NV center to split, and the degree of splitting is linearly related to the magnetic field strength. Therefore, by accurately measuring the degree of spin energy level splitting, such as measuring the frequency shift or broadening change of the ODMR (Optically Detected Magnetic Resonance Spectrum) spectrum line, the strength and direction of the external magnetic field can be determined, and then the current generating the external magnetic field can be measured.

[0004] However, the inventors of the present invention have found that due to the attenuation in the transmission of microwave signals, and the degree of attenuation changes with the microwave frequency. Therefore, when the measured current changes, it will cause the magnetic field detected by the NV center to also change, resulting in a change in the microwave frequency at which magnetic resonance occurs, which is different from the microwave frequency applied to the NV center, leading to measurement errors.

[0005] The content of the background art section is only the technology known to the applicant and does not of course represent the prior art in this field. Summary of the Invention

[0006] According to one aspect of the present invention, the present invention provides a method for measuring current based on NV centers, including: exciting the NV center based on a laser signal; applying a microwave signal with a fixed frequency to the NV center; adjusting the relative distance between the NV center and the wire to be measured until the microwave signal with a fixed frequency undergoes magnetic resonance with the spin energy levels of the NV center; in the case of magnetic resonance, determining the current information of the wire to be measured according to the relative distance between the NV center and the wire to be measured.

[0007] According to some embodiments of the present invention, the NV color center is disposed on the displacement control module, and the distance between the NV color center and the wire to be measured is adjusted until the microwave signal with a fixed frequency and the spin energy level of the NV color center generate magnetic resonance, including: collecting the fluorescence signal of the NV color center; modulating and demodulating the fluorescence signal to generate a control command; driving the displacement control module according to the control command, so that the displacement control module drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire to be measured.

[0008] According to some embodiments of the present invention, adjusting the relative distance between the NV color center and the wire to be measured until the microwave signal with a fixed frequency and the spin energy level of the NV color center reach magnetic resonance includes: determining whether magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV color center.

[0009] According to another aspect of the present invention, the present invention provides a current measurement device based on an NV color center, including a laser module, a microwave module, a displacement control module, and a control module. The laser module excites the NV color center based on a laser signal; the microwave module applies a microwave signal with a fixed frequency to the NV color center; the displacement control module adjusts the relative distance between the NV color center and the wire to be measured until the microwave signal with a fixed frequency and the spin energy level of the NV color center generate magnetic resonance; the control module determines the current information of the wire to be measured according to the relative distance between the NV color center and the wire to be measured when magnetic resonance occurs.

[0010] According to some embodiments of the present invention, the current measurement device further includes a photoelectric detection module and a phase-locked module. The photoelectric detection module collects the fluorescence signal of the NV color center; the phase-locked module modulates and demodulates the fluorescence signal to generate a control command, and drives the displacement control module according to the control command, so that the displacement control module drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire to be measured.

[0011] According to some embodiments of the present invention, the photoelectric detection module determines whether magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV color center.

[0012] According to some embodiments of the present invention, the displacement control module includes at least one of a stepper motor, a push rod motor, an electric push rod, and a piezoelectric ceramic; the phase-locked module includes a lock-in amplifier.

[0013] According to another aspect of the present invention, the present invention further provides an electronic device. The electronic device includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, enabling the one or more processors to implement the current measurement method as described above.

[0014] According to another aspect of the present invention, the present invention also provides a non-volatile computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, it can implement the current measurement method as described above.

[0015] According to another aspect of the present invention, the present invention also provides a computer program product. The computer program product includes: a computer program stored on a computer-readable storage medium; the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is made to execute the current measurement method as described above.

[0016] Beneficial effects

[0017] The present invention can excite the NV color center based on a laser signal, apply a microwave signal with a fixed frequency to the NV color center, and then adjust the relative distance between the NV color center and the wire to be measured until the microwave signal with a fixed frequency resonates with the spin energy level of the NV color center. In the case of resonance, the current information of the wire to be measured is determined according to the relative distance between the NV color center and the wire to be measured.

[0018] The present invention can match the resonance condition by adjusting the position of the NV color center (i.e., changing the magnetic field) based on a fixed microwave frequency, which can avoid the problem of measurement error caused by differences in microwave frequencies. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0020] Figure 1 A schematic flowchart showing the current measurement method according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram showing a wire to be measured according to an embodiment of the present invention;

[0022] Figure 3 Another schematic flowchart showing the current measurement method according to an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram showing the current measurement device according to an embodiment of the present invention.

[0024] Description of the reference numerals:

[0025] Current measurement device 1; Laser module 10; Microwave module 20; Displacement control module 30; Control module 40; Photoelectric detection module 50; Phase-locked module 60. Detailed Implementation Modes

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Identical reference numerals in the figures denote identical or similar parts, and thus their repeated description will be omitted.

[0027] The features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. may be employed. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0028] Furthermore, 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 is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0029] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] The basic principle of measuring current based on the NV color center is as follows: The NV color center is placed as a sensing unit for measuring current near the current to be measured. The current to be measured generates a magnetic field around it, and this magnetic field acts on the electron spin energy levels of the NV color center. Then, the NV color center is excited from the ground state to the excited state by laser, and the fluorescence signal of its de-excitation is detected. When the applied microwave frequency resonates with the transition frequency of the ground state spin energy level of the NV color center, the fluorescence intensity will change significantly. By scanning the microwave frequency and monitoring the fluorescence change, the nuclear magnetic resonance spectrum line can be obtained. The offset of the resonance frequency is proportional to the external magnetic field strength, and thus the magnitude of the current to be measured can be deduced.

[0032] When the current to be measured changes, the magnetic field generated around the current to be measured also changes accordingly. Therefore, it is necessary to adjust the microwave frequency to find the resonant microwave frequency corresponding to the magnetic field generated after the current change, so that the magnitude of the measured current can be determined according to this resonant microwave.

[0033] However, the inventors of the present invention have found that due to attenuation in the transmission of microwave signals, and the degree of attenuation changes with the microwave frequency. Therefore, when the measured current changes, it will cause the magnetic field detected by the NV center to also change, resulting in a change in the microwave frequency at which magnetic resonance occurs, which is different from the microwave frequency applied to the NV center, leading to measurement errors.

[0034] For example, currently the microwave frequency resonant with the NV center is determined by the fluorescence signal detected by a photodetector. However, due to the different attenuation degrees of microwave transmissions at different frequencies, when the microwave source outputs a constant power and at different microwave frequencies, the microwave power applied to the NV center is different, resulting in a deviation between the resonant microwave frequency determined by the fluorescence signal intensity and the true microwave frequency resonant with the NV center, thus generating measurement errors.

[0035] Based on this, according to one aspect of the present invention, the present invention provides a current measurement method based on the NV center. Figure 1 A flowchart showing the current measurement method according to an embodiment of the present invention is as follows. Figure 1 As shown, the current measurement method may include steps S100 - S400.

[0036] Exemplarily, the current measurement method may be executed by a current measurement device with computing capabilities.

[0037] According to an exemplary embodiment, in step S100, the current measurement device excites the NV center based on a laser signal. For example, the current measurement device may emit a laser signal. The laser signal can excite the NV center to transition from the ground state to the excited state.

[0038] It can be understood here that the NV center can be used as a current measurement sensing unit and placed near the wire to be measured to achieve the measurement of the current in the wire to be measured. Exemplarily, the NV center can be regarded as a detection probe.

[0039] In step S200, the current measurement device applies a microwave signal with a fixed frequency to the NV center.

[0040] For example, the current measurement device can emit microwave signals. The ground state (electronic spin state) of the NV color center will undergo Zeeman splitting in a magnetic field, forming different energy levels (such as |0> and |±1>, etc.). When a microwave signal with a certain frequency is applied to the NV color center and the frequency of the microwave signal matches the energy difference (i.e., the resonance frequency) between the spin energy levels of the NV color center, it will induce a transition of the spin state (such as |0> → |±1>).

[0041] Exemplarily, the frequency of the applied microwave signal is fixed. This fixed frequency can be custom-set according to user requirements.

[0042] In step S300, the current measurement device adjusts the relative distance between the NV color center and the wire under test until the microwave signal with a fixed frequency undergoes magnetic resonance with the spin energy levels of the NV color center.

[0043] For example, the NV color center can be arranged on the displacement control module. The current measurement device can drive the displacement control module to move in a direction closer to or farther away from the wire under test, thereby adjusting the distance between the NV color center and the wire under test.

[0044] In step S400, when magnetic resonance occurs, the current measurement device determines the current information of the wire under test according to the relative distance between the NV color center and the wire under test.

[0045] Figure 2 A schematic diagram of the wire under test showing an embodiment of the present invention.

[0046] For example, as Figure 2 shown, due to the electromagnetic effect, a certain magnetic field distribution will be formed around the wire under test after it is energized. When current passes through the wire under test, the electrons inside the wire under test start to move under the action of the electric field force, and these moving electrons will generate a magnetic field. The magnetic field direction of this magnetic field is perpendicular to the current direction, the magnitude of this magnetic field is proportional to the current, and is inversely proportional to the perpendicular distance from the wire under test.

[0047] As an embodiment, the calculation formula for the magnetic field magnitude around an infinitely long straight wire can be:[[]]END]]

[0048]

[0049] where B is the magnetic field strength, μ0 is the vacuum permeability (a constant), I is the current magnitude, and r is the relative distance between the NV color center and the wire under test.

[0050] That is, in the prior art, the relative distance r between the NV color center and the wire under test is a fixed value. By measuring the magnetic field strength B, the current I of the wire under test can be determined.

[0051] However, the inventors found that when the current changes, it will cause the magnetic field detected by the NV color center to change, resulting in a change in the microwave frequency at which magnetic resonance occurs, which is different from the microwave frequency applied to the NV color center, leading to measurement errors.

[0052] In the case where the microwave signal applied to the NV color center is a fixed frequency, the present invention adjusts the relative distance r between the NV color center and the wire to be measured through the displacement control module until the spin energy level of the NV color center resonates with the microwave signal of this fixed frequency. Such a setting can make the magnetic field strength B at the NV color center (i.e., the detection probe) constant. Then, in the case of magnetic resonance, the current measurement device can determine the current information of the wire to be measured based on Formula 1 according to the current relative distance r between the NV color center and the wire to be measured and the magnetic field strength B.

[0053] Compared with the microwave signal in the prior art that scans the microwave frequency to find the resonance frequency, the present invention can apply a fixed microwave frequency to the NV color center, which can make the microwave power applied to the NV color center also fixed. Then, the resonance frequency determined by the fluorescence signal intensity is accurate, thereby avoiding the generation of measurement errors.

[0054] The present invention can avoid the problem of measurement errors caused by differences in microwave frequencies by adjusting the position of the NV color center to match the resonance conditions.

[0055] Figure 3 Another schematic flowchart of the current measurement method according to an embodiment of the present invention is shown.

[0056] Optionally, as Figure 3 shown, step S300 may further include steps S310 - S330.

[0057] In step S310, the current measurement device collects the fluorescence signal of the NV color center.

[0058] For example, the current measurement device can collect the fluorescence signal of the NV color center to detect the intensity change of the fluorescence signal.

[0059] In step S320, the current measurement device modulates and demodulates the fluorescence signal to generate a control command.

[0060] In step S330, the current measurement device drives the displacement control module according to the control command, so that the displacement control module drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire to be measured.

[0061] For example, the current measurement device can use modulation and demodulation techniques (such as frequency modulation microwave and lock-in amplification) to extract the differential signal of the fluorescence signal and lock the resonance point. The current measurement device can generate a corresponding control instruction according to the fluorescence signal and send the control instruction to the displacement control module in the current measurement device. The NV color center is set on the displacement control module, and when the displacement control module moves, it will drive the movement of the NV color center.

[0062] Exemplarily, by controlling the movement of the displacement control module, the current measurement device can move the distance between the NV color center and the wire to be measured from near to far or from far to near, and by detecting the fluorescence intensity signal in real time, a spectrum line with the horizontal axis being the distance between the NV color center and the wire to be measured and the vertical axis being the fluorescence signal intensity can be obtained.

[0063] The current measurement device can determine the relative distance r between the NV color center and the wire to be measured when resonating with the fixed microwave frequency according to the spectrum line.

[0064] Exemplarily, when the current in the wire to be measured changes, the current measurement device can control the displacement control module to keep the relative distance r between the NV color center and the wire to be measured always at the resonance position, and the magnitude of the current in the wire to be measured can be calculated through the relative distance r between the NV color center and the wire to be measured.

[0065] Through the above embodiments, the present invention can extract the resonance information in the fluorescence signal from high-frequency noise based on modulation and demodulation techniques (such as lock-in amplification), and can suppress interference such as ambient light and laser fluctuations through narrowband filtering. And the present invention can control the movement of the displacement control module (i.e., the NV color center) based on the modulated and demodulated fluorescence signal to adjust the relative distance r between the NV color center and the wire to be measured.

[0066] Optionally, in step S300, the current measurement device determines whether magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV color center.

[0067] For example, the current measurement device can detect the fluorescence intensity of the fluorescence signal of the NV color center in real time, and determine that magnetic resonance has occurred when the fluorescence intensity meets a preset condition.

[0068] Exemplarily, the current measurement device adjusts the relative distance r between the NV color center and the wire to be measured through the displacement control module. When the fluorescence intensity shows a resonance valley at the fixed microwave frequency, the current measurement device can determine that magnetic resonance has occurred and stop adjusting the relative distance r between the NV color center and the wire to be measured.

[0069] According to one aspect of the present invention, the present invention provides a current measurement device based on an NV color center. Figure 4 The structural schematic diagram of the current measurement device showing the embodiments of the present invention.

[0070] According to the exemplary embodiment, as Figure 4 shown, the current measurement device 1 may include a laser module 10, a microwave module 20, a displacement control module 30, and a control module 40.

[0071] The laser module 10 excites the NV color center based on a laser signal. For example, the laser module 10 may emit a laser signal. This laser signal can excite the NV color center, causing it to transition from the ground state to the excited state.

[0072] It can be understood here that, as Figure 4 shown, the NV color center can be used as a current measurement sensing unit and placed near the wire to be measured to achieve the measurement of the current in the wire to be measured. Exemplarily, the NV color center can be regarded as a detection probe.

[0073] The microwave module 20 applies a microwave signal with a fixed frequency to the NV color center.

[0074] For example, the microwave module 20 may emit a microwave signal. The ground state (electron spin state) of the NV color center will undergo Zeeman splitting in a magnetic field, forming different energy levels (such as |0> and |±1>, etc.). When the NV color center is applied with a microwave signal of a certain frequency, and the frequency of this microwave signal matches the energy difference (i.e., the resonance frequency) between the spin energy levels of the NV color center, it will induce a transition of the spin state (such as |0> → |±1>).

[0075] Exemplarily, the frequency of the applied microwave signal is fixed. This fixed frequency can be custom-set according to user requirements.

[0076] The displacement control module 30 adjusts the relative distance between the NV color center and the wire to be measured until the microwave signal with a fixed frequency undergoes magnetic resonance with the spin energy levels of the NV color center.

[0077] For example, the NV color center can be arranged on the displacement control module. The displacement control module 30 can move in a direction closer to or farther from the wire to be measured, thereby adjusting the distance between the NV color center and the wire to be measured.

[0078] The control module 40 determines the current information of the wire to be measured according to the relative distance between the NV color center and the wire to be measured in the case of magnetic resonance.

[0079] For example, as Figure 2 shown, due to the electromagnetic effect, a certain magnetic field distribution will be formed around the wire to be measured after it is energized. When current passes through the wire to be measured, the electrons inside the wire to be measured start to move under the action of the electric field force, and these moving electrons will generate a magnetic field. The magnetic field direction of this magnetic field is perpendicular to the current direction, and the magnitude of this magnetic field is proportional to, and inversely proportional to the perpendicular distance from the wire to be measured.

[0080] As an example, the calculation formula for the magnitude of the magnetic field around an infinitely long straight wire can be:

[0081]

[0082] where B is the magnetic field strength, μ0 is the magnetic permeability of vacuum (a constant), I is the magnitude of the current, and r is the relative distance between the NV center and the wire to be measured.

[0083] That is, in the prior art, the relative distance r between the NV center and the wire to be measured is a fixed value. By measuring the magnetic field strength B, the current I of the wire to be measured can be determined.

[0084] However, the inventor found that when the current changes, it will cause the magnetic field detected by the NV center to change, so that the microwave frequency at which magnetic resonance occurs also changes, which is different from the microwave frequency applied to the NV center, resulting in measurement errors.

[0085] In the present invention, when the microwave signal applied to the NV center is a fixed frequency, the relative distance r between the NV center and the wire to be measured is adjusted by the displacement control module 30 until the spin energy level of the NV center resonates with the microwave signal of the fixed frequency. Such a setting can make the magnetic field strength B at the NV center (i.e., the detection probe) constant. Then, in the case of magnetic resonance, the control module 40 can determine the current information of the wire to be measured based on Formula 1 according to the current relative distance r between the NV center and the wire to be measured and the magnetic field B.

[0086] Compared with the microwave signal that searches for the resonance frequency by scanning the microwave frequency in the prior art, the present invention can apply a fixed microwave frequency to the NV center, which can make the microwave power applied to the NV center also fixed. Then, the resonance frequency determined by the fluorescence signal intensity is accurate, thereby avoiding the generation of measurement errors.

[0087] The present invention can avoid the problem of measurement errors caused by differences in microwave frequencies by adjusting the position of the NV center to match the resonance conditions.

[0088] Optionally, as Figure 4 shown, the current measuring device 1 may further include a photoelectric detection module 50 and a phase-locked module 60.

[0089] The photoelectric detection module 50 collects the fluorescence signal of the NV center.

[0090] For example, the photoelectric detection module 50 can collect the fluorescence signal of the NV center to detect the intensity change of the fluorescence signal.

[0091] The phase-locked module 60 modulates and demodulates the fluorescence signal to generate a control command.

[0092] The phase-locked module 60 drives the displacement control module 30 according to the control instruction, so that the displacement control module 30 drives the movement of the NV center, to adjust the relative distance between the NV center and the wire to be measured.

[0093] For example, the phase-locked module 60 can use modulation and demodulation techniques (such as frequency modulation microwave and lock-in amplification) to extract the differential signal of the fluorescence signal and lock the resonance point. The phase-locked module 60 can generate a corresponding control instruction according to the fluorescence signal and send the control instruction to the displacement control module 30. The NV center is arranged on the displacement control module 30. When the displacement control module 30 moves, it will drive the movement of the NV center.

[0094] Exemplarily, by controlling the movement of the displacement control module 30, the phase-locked module 60 can move the distance between the NV center and the wire to be measured from near to far or from far to near. And the photoelectric detection module 50 can obtain a spectrum line with the horizontal axis being the distance between the NV center and the wire to be measured and the vertical axis being the fluorescence signal intensity by detecting the fluorescence intensity signal in real time.

[0095] The control module 40 can determine the relative distance r between the NV center and the wire to be measured when resonating with the fixed microwave frequency according to the spectrum line.

[0096] Exemplarily, when the current in the wire under test changes, the phase-locked module 60 can control the displacement control module 30 to keep the relative distance r between the NV center and the wire to be measured always at the resonance position. The control module 40 can calculate the magnitude of the current in the wire to be measured through the relative distance r between the NV center and the wire to be measured.

[0097] Through the above embodiments, the present invention can extract the resonance information (related to microwave frequency) in the fluorescence signal from high-frequency noise based on modulation and demodulation techniques (such as lock-in amplification), and can suppress interference such as ambient light and laser fluctuation through narrow-band filtering. And the present invention can control the movement of the displacement control module (i.e., the NV center) based on the modulated and demodulated fluorescence signal to adjust the relative distance r between the NV center and the wire to be measured.

[0098] Optionally, the photoelectric detection module 50 determines whether magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV center.

[0099] For example, the photoelectric detection module 50 can detect the fluorescence intensity of the fluorescence signal of the NV center in real time, and determine that magnetic resonance has occurred when the fluorescence intensity meets the preset conditions.

[0100] Exemplarily, the current measurement device 1 adjusts the relative distance r between the NV center and the wire to be measured through the displacement control module 30. When a resonance valley appears in the fluorescence intensity at this fixed microwave frequency, the photoelectric detection module 50 can determine that magnetic resonance has occurred, and then the displacement control module 30 stops adjusting the relative distance r between the NV center and the wire to be measured.

[0101] Optionally, the displacement control module 30 includes at least one of a stepper motor, a push rod motor, an electric push rod, and a piezoelectric ceramic. The phase-locked module 60 may include a lock-in amplifier.

[0102] Exemplarily, the method for the displacement control module 30 to measure the relative distance data includes, but is not limited to, methods such as a code disk, a grating scale, or laser ranging. The present invention places no restrictions on this.

[0103] According to another aspect of the present invention, the present invention also provides an electronic device. The electronic device includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors can implement the current measurement method as described above.

[0104] According to another aspect of the present invention, the present invention also provides a non-volatile computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, it can implement the current measurement method as described above.

[0105] According to another aspect of the present invention, the present invention also provides a computer program product. The computer program product includes: a computer program stored on a computer-readable storage medium; the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the current measurement method as described above.

[0106] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions of the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A current measurement method based on NV color centers, characterized in that, Including: Exciting the NV color center based on a laser signal; Applying a microwave signal with a fixed frequency to the NV color center; Adjusting the relative distance between the NV color center and the wire under test until magnetic resonance occurs between the microwave signal with the fixed frequency and the spin energy levels of the NV color center; In the case where the magnetic resonance occurs, determining the current information of the wire under test according to the relative distance between the NV color center and the wire under test.

2. The current measurement method according to claim 1, wherein The NV color center is arranged on a displacement control module, and the adjusting the distance between the NV color center and the wire under test until magnetic resonance occurs between the microwave signal with the fixed frequency and the spin energy levels of the NV color center includes: Collecting the fluorescence signal of the NV color center; Modulating and demodulating the fluorescence signal to generate a control instruction; Driving the displacement control module according to the control instruction, so that the displacement control module drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire under test.

3. The current measurement method according to claim 2, characterized in that The adjusting the relative distance between the NV color center and the wire under test until magnetic resonance is achieved between the microwave signal with the fixed frequency and the spin energy levels of the NV color center includes: Determining whether the magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV color center.

4. A current measurement device based on NV centers, characterized in that, Including: A laser module that excites the NV color center based on a laser signal; A microwave module that applies a microwave signal with a fixed frequency to the NV color center; A displacement control module that adjusts the relative distance between the NV color center and the wire under test until magnetic resonance occurs between the microwave signal with the fixed frequency and the spin energy levels of the NV color center; A control module that, in the case where the magnetic resonance occurs, determines the current information of the wire under test according to the relative distance between the NV color center and the wire under test.

5. The current measurement device according to claim 4, characterized in that, The current measuring device further includes: An optoelectronic detection module that collects the fluorescence signal of the NV color center; A phase-locked module that modulates and demodulates the fluorescence signal to generate a control instruction, and drives the displacement control module according to the control instruction, so that the displacement control module drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire under test.

6. The current measurement device according to claim 5, wherein, The optoelectronic detection module determines whether the magnetic resonance occurs according to the intensity change of the fluorescence signal of the NV color center.

7. The current measuring device according to claim 5, characterized in that The displacement control module includes at least one of a stepper motor, a push rod motor, an electric push rod, and a piezoelectric ceramic; The phase-locked module includes a lock-in amplifier.

8. An electronic device, characterized in that, Including: One or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the current measuring method according to any one of claims 1-3.

9. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the current measuring method according to any one of claims 1-3.

10. A computer program product, characterized in that, Including a computer program stored on a computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the current measuring method according to any one of claims 1-3.

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