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 in a preset frequency range to the NV color center to determine a magnetic resonance spectral line corresponding to the preset frequency range; determining a resonance microwave frequency closest to a preset frequency range according to the magnetic resonance spectral line; adjusting the relative distance between the NV color center and the to-be-measured wire according to the size of the resonance microwave frequency; and determining current information of the to-be-detected wire according to the relative distance between the NV color center and the to-be-detected wire. By adjusting the relative distance between the NV color center and the wire to be measured, the resonance microwave frequency can be adjusted to be within the frequency range capable of being output by the microwave source, and therefore the measuring range of the current measuring device is enlarged.

Description

Technical Field

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

[0002] A nitrogen vacancy (NV) color center in diamond consists of a nitrogen atom replacing a carbon atom in the diamond lattice, and a neighboring vacancy. Due to their unique optical and spin properties, NV color centers have significant potential for applications in quantum information processing and quantum sensing technologies.

[0003] By using a laser to excite the NV center, it can be made to transition from the ground state to the excited state, and then return to the ground state through fluorescence emission. In this process, if a microwave signal that matches the frequency of the ground state spin energy level transition is applied, the NV center will undergo magnetic resonance, resulting in a significant change in the fluorescence intensity. By detecting the change in fluorescence intensity, the magnetic resonance signal can be obtained, thereby enabling the detection of the external magnetic field. For example, according to the Zeeman effect, the external magnetic field will cause the spin energy level 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 that generates the external magnetic field can be measured.

[0004] However, the inventors discovered that due to electromagnetic effects, when the current in the conductor being measured is high, the magnetic field it generates is also large, causing the microwave frequency that resonates with the NV center to be too high or too low. However, when this microwave frequency exceeds the output frequency range of the microwave source, current measurement becomes impossible. This limits the range of current measurement devices, making it impossible to measure a wide range of currents, from tiny to large.

[0005] The contents of the background technology section are merely technologies known to the public and do not necessarily represent the existing technologies 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 color centers, including: exciting NV color centers based on a laser signal; applying a microwave signal within a preset frequency range to the NV color centers to determine a magnetic resonance spectrum line corresponding to the preset frequency range; determining a resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectrum line; adjusting the relative distance between the NV color centers and the wire to be measured according to the magnitude of the resonance microwave frequency; and determining the current information of the wire to be measured according to the relative distance between the NV color centers and the wire to be measured.

[0007] According to some embodiments of the present invention, the NV color centers are arranged on a displacement control module. Adjusting the relative distance between the NV color centers and the wire to be measured according to the magnitude of the resonance microwave frequency includes: generating a displacement control instruction according to the magnitude of the resonance microwave frequency; driving the displacement control module according to the displacement control instruction, so that the displacement control module drives the movement of the NV color centers to adjust the relative distance between the NV color centers and the wire to be measured.

[0008] According to some embodiments of the present invention, the method for measuring current further includes: collecting the fluorescence signal of the NV color centers; modulating and demodulating the fluorescence signal to generate a frequency control instruction; and applying a microwave signal with a resonance microwave frequency to the NV color centers according to the frequency control instruction.

[0009] According to another aspect of the present invention, the present invention provides a device for measuring current based on NV color centers, including a laser module, a displacement control module, a microwave module, a photoelectric detection module, and a control module. The laser module excites the NV color centers based on a laser signal; the microwave module applies a microwave signal within a preset frequency range to the NV color centers; the photoelectric detection module determines a magnetic resonance spectrum line corresponding to the preset frequency range; the control module determines a resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectrum line; the displacement control module adjusts the relative distance between the NV color centers and the wire to be measured according to the magnitude of the resonance microwave frequency; and the control module determines the current information of the wire to be measured according to the relative distance between the NV color centers and the wire to be measured.

[0010] According to some embodiments of the present invention, the NV color centers are arranged on the displacement control module. The control module generates a displacement control instruction according to the magnitude of the resonance microwave frequency; the control module also drives the displacement control module according to the displacement control instruction, so that the displacement control module drives the movement of the NV color centers to adjust the relative distance between the NV color centers and the wire to be measured.

[0011] According to some embodiments of the present invention, the device for measuring current further includes: a phase-locked module that modulates and demodulates the fluorescence signal of the NV color centers collected by the photoelectric detection module to generate a frequency control instruction; and the microwave module applies a microwave signal with a resonance microwave frequency to the NV color centers according to the frequency control instruction.

[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 also provides an electronic device. The electronic device includes: one or more processors; a storage device for storing one or more programs, which when executed by the one or more processors, enable 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] By adjusting the relative distance between the NV color center and the wire to be measured, the present invention can adjust the resonance microwave frequency to within the frequency range that the microwave source can output, thereby increasing the measurement range of the current measurement device. And the present invention can change the relative distance between the NV color center and the wire to be measured from a fixed quantity to a variable quantity, and can jointly calculate the magnitude of the current in the wire to be measured with the resonance microwave frequency. Description of the drawings

[0018] 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, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0019] Figure 1 A schematic flowchart showing the current measurement method according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram showing the relationship between the magnetic field and the resonance microwave frequency according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram showing a wire to be measured according to an embodiment of the present invention;

[0022] Figure 4Another flowchart showing the current measurement method according to an embodiment of the present invention;

[0023] Figure 5 Another flowchart showing the current measurement method according to an embodiment of the present invention;

[0024] Figure 6 Schematic structural diagram of a current measurement device according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] Current measurement device 1; Laser module 10; Microwave module 20; Photoelectric detection module 30; Control module 40; Displacement control module 50; Phase-locked module 60. Detailed implementation manners

[0027] 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. Like reference numerals in the figures denote like or similar parts, and thus their repeated description will be omitted.

[0028] The features, structures, or characteristics described may be combined in one or more embodiments in any suitable manner. 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 recognize that the technical solutions of the present disclosure can be practiced without one or more of these specific details, or may be implemented using other means, components, materials, devices, etc. In such cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0029] In addition, the terms "comprising" and "having", as well as any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0030] The terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order.

[0031] Combined with the accompanying drawings in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0032] 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 a 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.

[0033] In the prior art, the distance between the NV color center and the wire to be measured is fixed. When the current in the wire to be measured changes, the magnetic field at the NV color center also changes accordingly. At this time, by adjusting the microwave frequency, the resonance microwave frequency corresponding to the changed magnetic field can be found, and then the magnitude of the current to be measured can be calculated based on this resonance microwave frequency.

[0034] However, the inventors of the present invention have found that based on the electromagnetic effect, when the current in the wire to be measured is large, the generated magnetic field is also large, resulting in the microwave frequency resonating with the NV color center being too large or too small. But when this microwave frequency exceeds the range of frequencies that the microwave source can output, it will lead to the inability to measure the current. As a result, the measurement range of the current measurement device is limited, and it is impossible to achieve a large-range measurement from a small current to a large current.

[0035] Based on this, on the one hand of the present invention, the present invention provides a current measurement method based on the NV color center. Figure 1 A flowchart showing the current measurement method of an embodiment of the present invention is as follows. As Figure 1 shown, the current measurement method may include steps S100 - S500.

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

[0037] According to the exemplary embodiment, in step S100, the current measurement device excites the NV color center based on a laser signal.

[0038] For example, the current measurement device may emit a laser signal. This laser signal can excite the NV color center to transition from the ground state to the excited state.

[0039] It can be understood here that the NV color center can be used as a current measurement sensing unit and placed near the wire to be measured to measure the current of the wire to be measured. Exemplarily, the NV color center can be regarded as a detection probe.

[0040] Figure 2 Show a schematic diagram of the relationship between the magnetic field and the resonance microwave frequency in an embodiment of the present invention.

[0041] In step S200, the current measurement device applies a microwave signal within a preset frequency range to the NV color center to determine the magnetic resonance spectrum line corresponding to the preset frequency range.

[0042] For example, the current measurement device can apply a microwave signal to the NV color center and record the fluorescence signal intensity of the NV color center corresponding to the microwave signal. The preset frequency range can be the frequency range of the microwave signal that the current measurement device can output.

[0043] Exemplarily, the ground state (electron spin state) of the NV color center will undergo Zeeman splitting in a magnetic field to form 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 the microwave signal matches the energy difference between the spin energy levels of the NV color center (i.e., the resonance microwave frequency), it will induce a transition of the spin state (such as |0>→|±1>). Therefore, the current measurement device can obtain the corresponding magnetic resonance spectrum line (i.e., the ODMR spectrum line) by applying a microwave signal to the NV color center and then scanning the microwave frequency and synchronously recording the fluorescence signal intensity of the NV color center.

[0044] As an embodiment, as Figure 2 shown, the abscissa is the frequency of the applied microwave signal, and the ordinate is the fluorescence signal intensity of the NV color center. Figure 2 Show the magnetic resonance spectrum lines corresponding to the NV color center in magnetic fields of different magnitudes (such as B = 0, B = 2.8 mT, B = 5.8 mT, B = 8.3 mT, etc.).

[0045] In step S300, the current measurement device determines the resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectrum line.

[0046] For example, as Figure 2 shown, when the magnetic field at the NV color center is not zero, there will be two resonance microwave frequencies in its magnetic resonance spectrum line, such as ω1 and ω2. Then the current measurement device determines a resonance microwave frequency among ω1 and ω2 that is closest to the two limits of the preset frequency range.

[0047] Exemplarily, as Figure 2As shown, assuming that the preset frequency range of the current measurement device is (2600 MHz to 3200 MHz), the current measurement device determines a resonance microwave frequency that is closest to the lower limit value of 2600 MHz of the preset frequency range, or a resonance microwave frequency that is closest to the upper limit value of 3200 MHz of the preset frequency range.

[0048] In step S400, the current measurement device adjusts the relative distance between the NV center and the wire under test according to the magnitude of the resonance microwave frequency.

[0049] For example, when the resonance microwave frequency is relatively close to the limit value of the preset frequency range (i.e., the frequency range that the current measurement device can output), the current measurement device can increase the current measurement range of the current measurement device by adjusting (increasing or decreasing) the relative distance between the NV center and the wire under test.

[0050] In step S500, the current measurement device determines the current information of the wire under test according to the relative distance between the NV center and the wire under test.

[0051] Figure 3 A schematic diagram of the wire under test according to an embodiment of the present invention is shown.

[0052] For example, as Figure 3 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.

[0053] As an embodiment, the calculation formula for the magnetic field magnitude around an infinitely long straight wire can be:

[0054]

[0055] where B is the magnetic field strength, μ0 is the vacuum magnetic permeability (a constant), I is the current magnitude, and r is the relative distance between the NV center and the wire under test.

[0056] That is, in the prior art, the relative distance r between the NV center and the wire under test is a fixed value, and by measuring the magnetic field strength B, the current I of the wire under test can be determined.

[0057] However, the inventor found that in the case of a large current, the magnetic field detected at the NV center also becomes larger, so that the resonance microwave frequency at which magnetic resonance occurs also changes (such as increasing or decreasing). And in the case where the resonance microwave frequency exceeds the frequency range that the microwave source can output, the measurement of this current cannot be realized.

[0058] By adjusting the relative distance r between the NV color center and the wire to be measured, the present invention can correspondingly decrease or increase the magnetic field strength B, and further adjust the required resonance microwave frequency so as to adjust the resonance microwave frequency within the frequency range that can be output by the microwave source.

[0059] According to an exemplary embodiment, the current measurement device can determine the magnetic field strength B at the NV color center based on the resonance microwave frequency. Thus, based on the magnetic field strength B and the relative distance r, the current measurement device can determine the current I of the wire to be measured according to Formula 1.

[0060] Compared with the prior art, by adjusting the relative distance between the NV color center and the wire to be measured, the present invention can adjust the resonance microwave frequency within the frequency range that can be output by the microwave source, thereby increasing the measurement range of the current measurement device. In addition, the present invention can change the relative distance between the NV color center and the wire to be measured from a fixed quantity to a variable quantity, and can jointly calculate the magnitude of the current in the wire to be measured with the resonance microwave frequency.

[0061] Figure 4 Another schematic flowchart of the current measurement method according to an embodiment of the present invention is shown.

[0062] Optionally, as Figure 4 shown, step S400 may further include steps S410 - S420.

[0063] In step S410, the current measurement device generates a displacement control command according to the magnitude of the resonance microwave frequency.

[0064] In step S420, the current measurement device drives the displacement control module according to the displacement 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.

[0065] For example, the NV color center may be disposed on the displacement control module. The current measurement device generates a corresponding displacement control command according to the magnitude of the resonance microwave frequency. The displacement control command can drive the displacement control module to move in the direction close to the wire to be measured, thereby reducing the distance between the NV color center and the wire to be measured. The displacement control command can also drive the displacement control module to move in the direction away from the wire to be measured, thereby increasing the distance between the NV color center and the wire to be measured.

[0066] Through the above embodiments, by setting the displacement control module, the present invention can accurately adjust the relative distance between the NV color center and the wire to be measured.

[0067] Figure 5 Another schematic flowchart of the current measurement method according to an embodiment of the present invention is shown.

[0068] Optionally, as Figure 5As shown, the current measurement method may further include steps S600 - S800.

[0069] In step S600, the current measurement device collects the fluorescence signal of the NV color center.

[0070] In step S700, the current measurement device modulates and demodulates the fluorescence signal to generate a frequency control command.

[0071] In step S800, the current measurement device applies a microwave signal with a resonant microwave frequency to the NV color center according to the frequency control command.

[0072] 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. For example, the current measurement device can use modulation and demodulation techniques (such as frequency - modulated 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 frequency control command according to the resonance point to control the fixed output of the resonance microwave that resonates with the NV color center according to the frequency control command, so as to obtain the corresponding resonance microwave frequency.

[0073] With such a setting, in the case where the current to be measured changes, the present invention can lock the resonance position in real time through the phase - locked technology without having to perform a complete sweep spectrum measurement again. Through the phase - locked technology, the NV color center can be in a resonance state in real time.

[0074] Through the above - mentioned 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 narrow - band filtering. And the present invention can control the current measurement device to output a resonance microwave that resonates with the NV color center in real time based on the modulated and demodulated fluorescence signal.

[0075] According to one aspect of the present invention, the present invention provides a current measurement device based on an NV color center. Figure 6 The structural schematic diagram of the current measurement device showing the embodiments of the present invention is shown.

[0076] According to the exemplary embodiment, as Figure 6 shown, the current measurement device 1 may include an NV color center, a laser module 10, a microwave module 20, a photoelectric detection module 30, a control module 40, and a displacement control module 50.

[0077] According to the exemplary embodiment, the laser module 10 excites the NV color center based on a laser signal.

[0078] For example, the laser module 10 can emit a laser signal. The laser signal can excite the NV color center to transition from the ground state to the excited state.

[0079] It can be understood here that the NV color center can be used as a current measurement sensing unit and placed near the wire to be measured to measure the current of the wire to be measured. Exemplarily, the NV color center can be regarded as a detection probe.

[0080] The microwave module 20 applies a microwave signal within a preset frequency range to the NV color center. The photoelectric detection module 30 determines the magnetic resonance spectral line corresponding to the preset frequency range.

[0081] For example, the microwave module 20 can apply a microwave signal to the NV color center, and the photoelectric detection module 30 can record the fluorescence signal intensity of the NV color center corresponding to the microwave signal. The preset frequency range can be the frequency range of the microwave signal that the microwave module 20 can output.

[0082] Exemplarily, the ground state (electron spin state) of the NV color center will undergo Zeeman splitting in a magnetic field to form 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 the microwave signal matches the energy difference between the spin energy levels of the NV color center (i.e., the resonance microwave frequency), it will induce a transition of the spin state (such as |0> → |±1>). Therefore, the microwave module 20 applies a microwave signal to the NV color center, and then the photoelectric detection module 30 can obtain the corresponding magnetic resonance spectral line (i.e., the ODMR spectral line) by scanning the microwave frequency and synchronously recording the fluorescence signal intensity of the NV color center.

[0083] As an embodiment, as Figure 2 shown, the abscissa is the frequency of the applied microwave signal, and the ordinate is the fluorescence signal intensity of the NV color center. Figure 2 shows the magnetic resonance spectral lines corresponding to the NV color center in magnetic fields of different magnitudes (such as B = 0, B = 2.8 mT, B = 5.8 mT, B = 8.3 mT, etc.).

[0084] The control module 40 determines the resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectral line.

[0085] For example, as Figure 2 shown, when the magnetic field at the NV color center is not zero, there will be two resonance microwave frequencies in its magnetic resonance spectral line, such as ω1 and ω2. Then the control module 40 determines one resonance microwave frequency that is closest to the two limit values of the preset frequency range between ω1 and ω2.

[0086] Exemplarily, as Figure 2 shown, assuming that the preset frequency range of the microwave module 20 is (2600 MHz to 3200 MHz), then the control module 40 determines one resonance microwave frequency that is closest to the lower limit value of 2600 MHz of the preset frequency range, or one resonance microwave frequency that is closest to the upper limit value of 3200 MHz of the preset frequency range.

[0087] The displacement control module 50 adjusts the relative distance between the NV color center and the wire under test according to the magnitude of the resonant microwave frequency.

[0088] For example, when the resonant microwave frequency is relatively close to the limit value of the preset frequency range (i.e., the frequency range that the current measuring device can output), the displacement control module 50 can increase the current measurement range of the current measuring device by adjusting (increasing or decreasing) the relative distance between the NV color center and the wire under test.

[0089] The control module 40 determines the current information of the wire under test according to the relative distance between the NV color center and the wire under test.

[0090] Figure 3 A schematic diagram of the wire under test showing an embodiment of the present invention.

[0091] For example, as Figure 3 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.

[0092] As an embodiment, the calculation formula for the magnetic field magnitude around an infinitely long straight wire can be:

[0093]

[0094] where B is the magnetic field strength, μ0 is the vacuum magnetic permeability (a constant), I is the current magnitude, and r is the relative distance between the NV color center and the wire under test.

[0095] That is, in the prior art, the relative distance r between the NV color center and the wire under test is a fixed value, and by measuring the magnetic field strength B, the current I of the wire under test can be determined.

[0096] However, the inventor found that when the current is large, the magnetic field detected at the NV color center also becomes large, causing the resonant microwave frequency at which magnetic resonance occurs to change (increase or decrease). In the case where this resonant microwave frequency exceeds the microwave frequency range that the microwave source can output, the measurement of this current cannot be achieved.

[0097] The present invention can correspondingly reduce or increase the magnetic field strength B by adjusting the relative distance r between the NV color center and the wire under test, and thus can adjust the required resonant microwave frequency to adjust this resonant microwave frequency within the frequency range that the microwave source can output.

[0098] According to an exemplary embodiment, the control module 40 can determine the magnetic field strength B at the NV color center based on the resonance microwave frequency. Thus, based on the magnetic field strength B and the relative distance r, the control module 40 can determine the current I of the wire to be measured according to Formula 1.

[0099] Compared with the prior art, in the present invention, by adjusting the relative distance between the NV color center and the wire to be measured, the resonance microwave frequency can be adjusted within the frequency range that the microwave source can output, thereby increasing the measurement range of the current measuring device. And in the present invention, the relative distance between the NV color center and the wire to be measured can be changed from a fixed quantity to a variable quantity, and the magnitude of the current in the wire to be measured can be deduced jointly with the resonance microwave frequency.

[0100] Optionally, the control module 40 generates a displacement control instruction according to the magnitude of the resonance microwave frequency. The control module 40 drives the displacement control module 50 according to the displacement control instruction, so that the displacement control module 50 drives the movement of the NV color center to adjust the relative distance between the NV color center and the wire to be measured.

[0101] For example, the NV color center can be arranged on the displacement control module 50. The control module 40 generates a corresponding displacement control instruction according to the magnitude of the resonance microwave frequency. The displacement control instruction can drive the displacement control module 50 to move in the direction close to the wire to be measured, thereby reducing the distance between the NV color center and the wire to be measured. The displacement control instruction can also drive the displacement control module 50 to move in the direction away from the wire to be measured, thereby increasing the distance between the NV color center and the wire to be measured.

[0102] Through the above embodiments, in the present invention, by arranging the displacement control module, the relative distance between the NV color center and the wire to be measured can be accurately adjusted.

[0103] Optionally, as Figure 6 shown, the current measuring device 1 may further include a phase-locked module 60.

[0104] The photoelectric detection module 30 collects the fluorescence signal of the NV color center.

[0105] The phase-locked module 60 modulates and demodulates the fluorescence signal to generate a frequency control instruction.

[0106] The control module 40 controls the microwave module 20 to apply a microwave signal with a resonance microwave frequency to the NV color center according to the frequency control instruction.

[0107] For example, the photoelectric detection module 30 can collect the fluorescence signal of the NV color center to detect the intensity change of the fluorescence signal. For example, the phase-locked module 60 can extract the differential signal of the fluorescence signal by using modulation and demodulation techniques (such as frequency modulation microwave and lock-in amplification) to lock the resonance point. The control module 40 can generate a corresponding frequency control instruction according to the resonance point, and control the microwave module 20 to fixedly output the resonance microwave that resonates with the NV color center according to the frequency control instruction, so as to obtain the corresponding resonance microwave frequency.

[0108] With such a setting, in the case where the current to be measured changes, the present invention can lock the resonance position in real time through the phase-locked technology without having to perform a complete spectrum sweep measurement again. Through the phase-locked technology, the NV color center can be kept in the resonance state in real time.

[0109] 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 current measurement device to output the resonance microwave that resonates with the NV color center in real time based on the modulated and demodulated fluorescence signal.

[0110] Optionally, the displacement control module 50 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 can include a lock-in amplifier.

[0111] Exemplarily, the manner in which the displacement control module 50 measures the relative distance data includes but is not limited to methods such as a code disk, a grating scale, or laser ranging, and the present invention does not limit this.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or perform equivalent replacements on 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 within a preset frequency range to the NV color center to determine a magnetic resonance spectral line corresponding to the preset frequency range; Determining a resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectral line; Adjusting the relative distance between the NV color center and the wire under test according to the magnitude of the resonance microwave frequency; Determining 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. Adjusting the relative distance between the NV color center and the wire under test according to the magnitude of the resonance microwave frequency includes: Generating a displacement control instruction according to the magnitude of the resonance microwave frequency; Driving the displacement control module according to the displacement 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 1, wherein The current measurement method further includes: Collecting a fluorescence signal of the NV color center; Modulating and demodulating the fluorescence signal to generate a frequency control instruction; Applying a microwave signal with the resonance microwave frequency to the NV color center according to the frequency control instruction.

4. A current measurement device based on NV color centers, characterized in that Including: A laser module for exciting the NV color center based on a laser signal; A microwave module for applying a microwave signal within a preset frequency range to the NV color center; An optoelectronic detection module for determining a magnetic resonance spectral line corresponding to the preset frequency range; A control module for determining a resonance microwave frequency closest to the preset frequency range according to the magnetic resonance spectral line; A displacement control module for adjusting the relative distance between the NV color center and the wire under test according to the magnitude of the resonance microwave frequency; The control module determines 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 measuring device according to claim 4, characterized in that, The NV color center is arranged on the displacement control module. The control module generates a displacement control instruction according to the magnitude of the resonance microwave frequency; The control module further drives the displacement control module according to the displacement 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 4, characterized in that The current measurement device further includes: A phase-locked module for modulating and demodulating the fluorescence signal of the NV color center collected by the optoelectronic detection module to generate a frequency control instruction; The microwave module applies a microwave signal with the resonance microwave frequency to the NV color center according to the frequency control instruction.

7. The current measurement device according to claim 6, 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 measurement 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 measurement method according to any one of claims 1-3.

10. A computer program product, characterized in that, Comprising a computer program stored on a computer-readable storage medium, the computer program including program instructions which, when executed by a computer, cause the computer to execute the current measurement method according to any one of claims 1-3.

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