Grounding current detection method and system based on quantum measurement

Abstract

The invention discloses a grounding current detection method and system based on quantum measurement. The method is suitable for a control module of the grounding current detection system based on quantum measurement. The system comprises a quantum state control module, an NV center detection module, a light collection module and a power supply module. The method comprises the following steps: controlling the light collection module to emit laser after the power supply module starts to supply power, so that the NV center detection module is excited by the laser to emit red fluorescence; the quantum state control module is controlled to apply a sweep frequency microwave field to the NV center detection module, so that the NV center detection module performs frequency matching according to the sweep frequency microwave field to generate red fluorescence intensity change; the light collection module is controlled to convert the detected red fluorescence intensity change into a fluorescence intensity signal and transmit the fluorescence intensity signal to the control module; and determining the resonance frequency according to the received fluorescence intensity signal, and then calculating to obtain the grounding current of the to-be-detected system. According to the invention, the safety and accuracy of measurement are improved.

Description

Technical Field

[0001] The present invention relates to the field of quantum application technology, and in particular to a ground current detection method and system based on quantum measurement. Background Art

[0002] The ground current method is a common method for measuring the ground current of electrical equipment or grounding system. Its main purpose is to evaluate the performance of the grounding system or detect faults. With the rapid development of smart grids, new energy power generation and high-density electronic equipment, the ground current of the grounding system has the characteristics of lower amplitude and more complex harmonic components, and the limitations of traditional measurement methods are becoming increasingly prominent. Common ground current measurement methods currently include direct measurement method and clamp ammeter method. The direct measurement method measures the current by directly connecting the ammeter in series with the grounding conductor or grounding lead. The grounding conductor needs to be disconnected, which not only affects the operation of the system but also poses a great safety hazard, especially in high-voltage environments. The clamp ammeter method uses a clamp ammeter clamped on the grounding conductor to measure the current flowing through the conductor. However, when measuring weak ground currents in the microampere to milliampere range, it is susceptible to environmental electromagnetic noise (such as interference from adjacent current-carrying conductors, geomagnetic fluctuations or equipment harmonics), resulting in a decrease in the signal-to-noise ratio and an increase in measurement errors, affecting the accuracy of the measurement results. Summary of the invention

[0003] The embodiments of the present invention provide a ground current detection method and system based on quantum measurement, which can effectively solve the problems of high risk and low accuracy of ground current detection in the prior art.

[0004] An embodiment of the present invention provides a ground current detection method based on quantum measurement, which is applicable to a control module of a ground current detection system based on quantum measurement; the ground current detection system based on quantum measurement also includes: a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module; the control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power supply module, and are arranged in the area where the system to be detected is located; the ground current detection method based on quantum measurement includes:

[0005] After the power supply module starts to supply power, the light collection module is controlled to emit laser, so that the NV center detection module is excited by the laser and emits red fluorescence;

[0006] After the NV center detection module emits red fluorescence, controlling the quantum state manipulation module to apply a swept frequency microwave field to the NV center detection module, so that the NV center detection module performs frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity;

[0007] Controlling the light collection module to detect changes in red fluorescence intensity, so that the light collection module converts the detected changes in red fluorescence intensity into a fluorescence intensity signal, and transmits the fluorescence intensity signal to the control module;

[0008] The fluorescence intensity signal is received, a resonance frequency is determined according to the fluorescence intensity signal, and a ground current of the system to be detected is calculated according to the resonance frequency and a preset vacuum permeability.

[0009] Further, the ground current of the system to be detected is calculated according to the resonant frequency and the preset vacuum permeability, including:

[0010] Obtaining the vertical distance between the ground current detection system based on quantum measurement and the system to be detected;

[0011] Calculate the magnetic field strength according to the zero field splitting, the electron spin gyromagnetic ratio and the resonance frequency corresponding to the NV center detection module;

[0012] The ground current of the system to be detected is calculated according to the magnetic field strength, the preset vacuum magnetic permeability and the vertical distance.

[0013] Furthermore, the light collection module includes: a laser, a photodetector and an optical element;

[0014] The laser is used to emit laser light;

[0015] The photoelectric detector is used to detect the change of red fluorescence intensity and convert the detected change of red fluorescence intensity into a fluorescence intensity signal;

[0016] The optical element is used to change and guide the optical paths of the laser and the red fluorescent light.

[0017] Further, the NV center detection module includes: an NV center probe, a multimode optical fiber and a microwave antenna;

[0018] The NV center probe is used to emit red fluorescence after being excited by the laser, and to perform frequency matching with the detection power according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence;

[0019] The multimode optical fiber is used to receive and transmit laser light to the NV center probe, and receive and transmit the change of red fluorescence intensity to the light collection module for detection;

[0020] The microwave antenna is used to apply the swept-frequency microwave field to the NV center probe.

[0021] Furthermore, the quantum state manipulation module includes: a microwave source, a microwave amplifier and an antenna;

[0022] The microwave source is used to generate an initial frequency-sweeping microwave field according to a preset microwave frequency;

[0023] The microwave amplifier is used to perform gain amplification according to the microwave power of the initial frequency-sweeping microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, thereby obtaining a final frequency-sweeping microwave field;

[0024] The antenna is used to transmit the final swept-frequency microwave field to the NV center detection module.

[0025] Furthermore, the power module includes: a battery pack, a voltage stabilizer, a DC-DC converter and an overload protection chip;

[0026] The battery pack is used to provide voltage;

[0027] The voltage stabilizer is used to output the voltage provided by the battery pack in a stable manner;

[0028] The DC-DC converter is used to convert the voltage output by the voltage regulator into the operating voltage required by the quantum state manipulation module, the NV center detection module, the light collection module and the control module respectively;

[0029] The overload protection chip is used to protect the operating voltage of the quantum state manipulation module, the NV center detection module, the light collection module and the control module.

[0030] As an improvement of the above scheme, another embodiment of the present invention provides a ground current detection system based on quantum measurement, including: a control module, a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module; the control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power supply module, and are arranged in the area where the system to be detected is located;

[0031] The control module is used to control the light collection module to emit laser after the power supply module starts to supply power, so that the NV center detection module is excited by the laser and emits red fluorescence;

[0032] The light collection module is used to emit laser light;

[0033] The NV center detection module is used to emit red fluorescence after being excited by laser;

[0034] The control module is further used to control the quantum state manipulation module to apply a swept-frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence, so that the NV center detection module performs frequency matching according to the swept-frequency microwave field to generate a change in red fluorescence intensity;

[0035] The quantum state manipulation module is used to apply a swept frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence;

[0036] The NV center detection module is further used to perform frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity;

[0037] The control module is further used to control the light collection module to detect the change in red fluorescence intensity, so that the light collection module converts the detected change in red fluorescence intensity into a fluorescence intensity signal; and receives the fluorescence intensity signal;

[0038] The light collection module is further used to convert the detected red fluorescence intensity change into a fluorescence intensity signal, and transmit the fluorescence intensity signal to the control module;

[0039] The control module is further used to receive the fluorescence intensity signal, determine the resonance frequency according to the fluorescence intensity signal, and calculate the ground current of the system to be detected according to the resonance frequency and a preset vacuum permeability.

[0040] By implementing the present invention, at least the following beneficial effects are achieved:

[0041] The invention provides a ground current detection method and system based on quantum measurement. The method can use an NV center detection module to perform quantum measurement, which is arranged in the area where a system to be detected is located. It is not necessary to connect an ammeter for preparatory work, and there is no requirement for the spatial environment. The measurement point in any area of ​​the system to be detected can be selected, which greatly reduces the influence of spatial factors on the selection of the measurement point, and does not need to be measured at a fixed position by a clamping tool. The position can also be moved at any time during the measurement process, thereby reducing the risk of operation and improving the safety of detection. At the same time, a control module, a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module work together. The quantum characteristics of the NV center detection module can detect extremely weak signal changes, and the quantum state transition is regulated by a swept-frequency microwave, which effectively suppresses environmental electromagnetic noise, significantly improves the signal-to-noise ratio, ensures the measurement accuracy in complex scenes, and significantly improves the detection accuracy of the ground current. The quantum state manipulation module applies a swept-frequency microwave field to the NV center detection module, and performs frequency matching, so that the change in red fluorescence intensity can be accurately measured. There is a direct correlation between the change in red fluorescence intensity and the ground current, thereby ensuring the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of a ground current detection method based on quantum measurement provided by one embodiment of the present invention;

[0043] Figure 2 It is a schematic structural diagram of a ground current detection device based on quantum measurement provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1, is a flow chart of a ground current detection method based on quantum measurement provided by an embodiment of the present invention, which is applicable to a control module of a ground current detection system based on quantum measurement; the ground current detection system based on quantum measurement also includes: a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module; the control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power supply module, and are arranged in the area where the system to be detected is located; the ground current detection method based on quantum measurement includes:

[0046] S1. After the power supply module starts to supply power, the light collection module is controlled to emit laser, so that the NV center detection module is excited by the laser and emits red fluorescence;

[0047] Specifically, the power module includes: a battery pack, a voltage stabilizer, a DC-DC converter and an overload protection chip;

[0048] The battery pack is used to provide voltage;

[0049] The voltage stabilizer is used to output the voltage provided by the battery pack in a stable manner;

[0050] The DC-DC converter is used to convert the voltage output by the voltage regulator into the operating voltage required by the quantum state manipulation module, the NV center detection module, the light collection module and the control module respectively;

[0051] The overload protection chip is used to protect the operating voltage of the quantum state manipulation module, the NV center detection module, the light collection module and the control module.

[0052] In a preferred embodiment of the present invention, the control module controls the battery pack in the power module to provide voltage, and then the voltage regulator outputs the voltage provided by the battery pack in a stable manner, and then the DC-DC converter converts the voltage output by the voltage regulator into the working voltage required by the quantum state manipulation module, the NV center detection module, the light collection module and the control module, respectively, and the overload protection chip protects the working voltage of the quantum state manipulation module, the NV center detection module, the light collection module and the control module. The voltage regulator realizes stable voltage output, prevents the measurement efficiency from being reduced due to power supply fluctuations, and improves the stability of the voltage; the DC-DC converter realizes efficient voltage conversion, converting the voltage of the battery pack into the working voltage required by different modules; the overload protection chip is responsible for ensuring the normal working state of the entire system, improving the safety and reliability of the power module, and each part cooperates to provide multiple stable voltage and current outputs for other modules of the system to ensure the reliable operation of the system.

[0053] Specifically, the light collection module includes: a laser, a photodetector and an optical element;

[0054] The laser is used to emit laser light;

[0055] The photoelectric detector is used to detect the change of red fluorescence intensity and convert the detected change of red fluorescence intensity into a fluorescence intensity signal;

[0056] The optical element is used to change and guide the optical paths of the laser and the red fluorescent light.

[0057] Specifically, the NV center detection module includes: an NV center probe, a multimode optical fiber and a microwave antenna;

[0058] The NV center probe is used to emit red fluorescence after being excited by the laser, and to perform frequency matching with the detection power according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence;

[0059] The multimode optical fiber is used to receive and transmit laser light to the NV center probe, and receive and transmit the change of red fluorescence intensity to the light collection module for detection;

[0060] The microwave antenna is used to apply the swept-frequency microwave field to the NV center probe.

[0061] In a preferred embodiment of the present invention, after the power module starts to supply power, the control module controls the laser in the light collection module to emit laser light, so that the NV center probe in the NV center detection module is excited by the laser light and emits red fluorescence. The laser is a 532nm laser that emits 532nm green laser light to provide stable laser excitation for the NV center detection module. The NV center probe is a sensor sensitive element for realizing ground current measurement.

[0062] S2. After the NV center detection module emits red fluorescence, controlling the quantum state manipulation module to apply a swept frequency microwave field to the NV center detection module, so that the NV center detection module performs frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity;

[0063] Specifically, the quantum state manipulation module includes: a microwave source, a microwave amplifier and an antenna;

[0064] The microwave source is used to generate an initial frequency-sweeping microwave field according to a preset microwave frequency;

[0065] The microwave amplifier is used to perform gain amplification according to the microwave power of the initial frequency-sweeping microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, thereby obtaining a final frequency-sweeping microwave field;

[0066] The antenna is used to transmit the final swept-frequency microwave field to the NV center detection module.

[0067] Preferably, the NV (Nitrogen-Vacancy) center probe is a point defect in diamond, consisting of a nitrogen atom and an adjacent vacancy, and has unique quantum properties. The electron spin state of the NV center probe can be expressed by the spin quantum number m s = 0 and m s = ±1. In zero magnetic field, the ground state (3A2) of the NV center probe is m s = 0 and m s = ±1 has an inherent zero field splitting (about 2.87GHz). The external magnetic field will cause m to s = ±1 energy levels split, and the amount of splitting is related to the strength and direction of the magnetic field. The NV center probe will produce photoluminescence (PL) and emit red light under the excitation of 532nm green light. s = 0 and m s = ±1) has different luminous efficiency, where m s= 0 has a higher luminescence efficiency. By applying a swept frequency microwave field to the NV center probe, resonant transitions between different spin states can be achieved. The resonant frequency is determined by the energy level splitting, and the specific value is related to the external magnetic field.

[0068] In a preferred embodiment of the present invention, after the NV center detection module emits red fluorescence, the control module controls the microwave source in the quantum state manipulation module to apply a swept frequency microwave field to the NV center probe of the NV center detection module, so that the NV center probe matches the frequency with the detection power according to the swept frequency microwave field, and produces a change in red fluorescence intensity. When the microwave frequency of the swept frequency microwave field matches the inherent energy level splitting frequency (detection power) of the NV center probe, the spin state of the NV center probe will transition, resulting in a decrease in the efficiency of emitting red fluorescence, thereby producing a change in red fluorescence intensity. The microwave source in the quantum state manipulation module generates an initial swept frequency microwave field according to a preset microwave frequency, and then the microwave amplifier performs gain amplification according to the microwave power of the initial swept frequency microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, and obtains the final swept frequency microwave field; finally, the antenna transmits the final swept frequency microwave field to the NV center detection module and applies it to the NV center probe. The antenna realizes the transmission of microwaves between the two modules under the premise of avoiding the NV center detection module located on the high voltage side and the quantum state manipulation module located on the low voltage side being directly connected.

[0069] S3, controlling the light collection module to detect changes in red fluorescence intensity, so that the light collection module converts the detected changes in red fluorescence intensity into a fluorescence intensity signal, and transmits the fluorescence intensity signal to the control module;

[0070] In a preferred embodiment of the present invention, the red fluorescence intensity change generated by the NV center probe is detected by the photodetector of the light collection module through the optical element in the light collection module, and the detected red fluorescence intensity change is converted into a fluorescence intensity signal, and then the fluorescence intensity signal is transmitted to the control module. The optical element is an optical element in the prior art that changes and guides the laser and red fluorescence light path.

[0071] S4. Receive the fluorescence intensity signal, determine the resonance frequency according to the fluorescence intensity signal, and calculate the ground current of the system to be detected according to the resonance frequency and a preset vacuum permeability.

[0072] Specifically, the ground current of the system to be detected is calculated according to the resonant frequency and the preset vacuum permeability, including:

[0073] Obtaining the vertical distance between the ground current detection system based on quantum measurement and the system to be detected;

[0074] Calculate the magnetic field strength according to the zero field splitting, the electron spin gyromagnetic ratio and the resonance frequency corresponding to the NV center detection module;

[0075] The ground current of the system to be detected is calculated according to the magnetic field strength, the preset vacuum magnetic permeability and the vertical distance.

[0076] In a preferred embodiment of the present invention, the external magnetic field changes the energy level structure of the NV center probe through the Zeeman effect:

[0077] f ± =D±γ e B z

[0078] Where: f ± is the resonance frequency; D is the zero-field splitting corresponding to the NV center detection module (about 2.87 GHz); γ e is the electron spin ratio (about 28 GHz / T); B z is the magnetic field component along the NV center symmetry axis. By measuring the resonant frequency, the magnetic field strength B can be inferred. z The Biot-Savart Law is a basic law in classical electromagnetism that describes the magnetic field generated by electric current. It states that the magnetic field around a point in a current-carrying wire is the sum of the contributions of tiny current elements in the wire to that point. The differential form of the Biot-Savart Law is:

[0079]

[0080] Where: dB is the tiny magnetic field generated by a tiny current element at a certain point in space; μ0 is the magnetic permeability of vacuum; I is the current in the wire; dI is the length direction vector of the current element; is the unit vector pointing from the current element to the observation point; r is the distance from the current element to the observation point, that is, the vertical distance between the ground current detection system based on quantum measurement and the system to be detected. If the current distribution in the wire is continuous, the magnetic field of the entire wire to a certain point is the superposition of the magnetic fields generated by all tiny current elements:

[0081]

[0082] Applying the Biot-Savart law to each current element in an infinitely long straight wire, the magnitude of the magnetic induction intensity is finally obtained:

[0083]

[0084] Where r is the vertical distance from the observation point to the conductor. The ground current of the system to be detected can be calculated based on the magnetic field strength, the preset vacuum magnetic permeability and the vertical distance. The resonant frequency is determined according to the fluorescence intensity signal, and the ground current of the system to be detected is calculated according to the resonant frequency and the preset vacuum magnetic permeability. Optical means are used for detection without direct contact with the system to be detected, thereby avoiding measurement errors caused by factors such as poor contact or contact resistance. This non-contact detection method not only improves the accuracy of the measurement, but also simplifies the operation process and reduces the difficulty of measurement. Due to the rapid response characteristics of quantum measurement technology, changes in ground current can be monitored in real time.

[0085] Schematically, it also includes a communication module, which includes two parts: a wireless communication module and a wired communication interface. The wireless communication module uses Bluetooth 5.0 and Wi-Fi dual modes, and the wired communication interface part adopts the USB 3.0 standard, which can provide a stable high-speed data transmission path.

[0086] In a preferred embodiment of the present invention, a 532nm laser of a light collection module is used to emit 532nm green light to excite the NV center probe, so that it is in a state of emitting red fluorescence; at the same time, a continuous frequency-sweeping microwave field is applied by a microwave source of a quantum state manipulation module, and the frequency-sweeping microwave field is applied to the NV center probe through a microwave amplifier and an antenna. When the microwave frequency matches the inherent energy level splitting frequency (detection frequency) of the NV center probe, the spin state of the NV center probe will transition, resulting in a decrease in the efficiency of emitting red fluorescence. The resonant frequency can be determined by detecting the change in red fluorescence intensity through the photodetector of the light collection module, and finally the ground current of the system to be detected is calculated based on the resonant frequency. Compared with the prior art, quantum measurement using the NV center probe has higher sensitivity and can realize the measurement of weak signals. At the same time, during the measurement process, the interference of background noise can be greatly reduced, and the recognition ability of weak signals is improved. Therefore, this embodiment can improve the measurement accuracy of the ground current, has higher sensitivity under the same working conditions, and has the ability to adapt to low current ranges and complex working conditions. The use of NV centers to prepare optical fiber probes does not require preparatory work and has no requirements for the spatial environment. Any position that the optical fiber can reach can be measured, so the measurement point can be selected arbitrarily, which greatly reduces the influence of spatial factors on the selection of measurement points. In addition, the optical fiber probe can not only measure fixed positions through clamping tools, but also move positions at any time during the measurement process to obtain information at different points. It avoids intrusion into the detection system itself, and the non-invasive measurement method can be measured under the condition that the detection system continues to work without stopping. At the same time, this embodiment does not need to lay out electrodes and conductors in advance, which simplifies the measurement process and does not affect the detection system itself.

[0087] By implementing this embodiment, the NV center detection module is used for quantum measurement, which is set in the area where the system to be detected is located. There is no need to connect an ammeter for preparatory work, and there is no requirement for the spatial environment. The measurement point can be selected in any area of ​​the system to be detected, which greatly reduces the influence of spatial factors on the selection of measurement points. There is no need to use a clamping tool to measure a fixed position, and the position can be moved at any time during the measurement process, thereby reducing the risk of operation and improving the safety of detection. At the same time, the control module, the quantum state manipulation module, the NV center detection module, the light collection module and the power module work together. The quantum characteristics of the NV center detection module can detect extremely weak signal changes, and the quantum state transition is regulated by swept-frequency microwaves to effectively suppress environmental electromagnetic noise, significantly improve the signal-to-noise ratio, ensure the measurement accuracy in complex scenarios, and significantly improve the detection accuracy of the ground current. By applying a swept-frequency microwave field to the NV center detection module through the quantum state manipulation module and performing frequency matching, the change in red fluorescence intensity can be accurately measured. There is a direct correlation between the change in red fluorescence intensity and the ground current, thereby ensuring the accuracy of the measurement result.

[0088] See also Figure 2 , is a schematic diagram of the structure of a ground current detection system based on quantum measurement provided by an embodiment of the present invention, comprising: a control module, a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module; the control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power supply module, and are arranged in the area where the system to be detected is located;

[0089] The control module is used to control the light collection module to emit laser after the power supply module starts to supply power, so that the NV center detection module is excited by the laser and emits red fluorescence;

[0090] The light collection module is used to emit laser light;

[0091] The NV center detection module is used to emit red fluorescence after being excited by laser;

[0092] The control module is further used to control the quantum state manipulation module to apply a swept-frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence, so that the NV center detection module performs frequency matching according to the swept-frequency microwave field to generate a change in red fluorescence intensity;

[0093] The quantum state manipulation module is used to apply a swept frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence;

[0094] The NV center detection module is further used to perform frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity;

[0095] The control module is further used to control the light collection module to detect the change in red fluorescence intensity, so that the light collection module converts the detected change in red fluorescence intensity into a fluorescence intensity signal; and receives the fluorescence intensity signal;

[0096] The light collection module is further used to convert the detected red fluorescence intensity change into a fluorescence intensity signal, and transmit the fluorescence intensity signal to the control module;

[0097] The control module is further used to receive the fluorescence intensity signal, determine the resonance frequency according to the fluorescence intensity signal, and calculate the ground current of the system to be detected according to the resonance frequency and a preset vacuum permeability.

[0098] Specifically, the light collection module includes: a laser, a photodetector and an optical element;

[0099] The laser is used to emit laser light;

[0100] The photoelectric detector is used to detect the change of red fluorescence intensity and convert the detected change of red fluorescence intensity into a fluorescence intensity signal;

[0101] The optical element is used to change and guide the optical paths of the laser and the red fluorescent light.

[0102] Specifically, the NV center detection module includes: an NV center probe, a multimode optical fiber and a microwave antenna;

[0103] The NV center probe is used to emit red fluorescence after being excited by the laser, and to perform frequency matching with the detection power according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence;

[0104] The multimode optical fiber is used to receive and transmit laser light to the NV center probe, and receive and transmit the change of red fluorescence intensity to the light collection module for detection;

[0105] The microwave antenna is used to apply the swept-frequency microwave field to the NV center probe.

[0106] Specifically, the quantum state manipulation module includes: a microwave source, a microwave amplifier and an antenna;

[0107] The microwave source is used to generate an initial frequency-sweeping microwave field according to a preset microwave frequency;

[0108] The microwave amplifier is used to perform gain amplification according to the microwave power of the initial frequency-sweeping microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, thereby obtaining a final frequency-sweeping microwave field;

[0109] The antenna is used to transmit the final swept-frequency microwave field to the NV center detection module.

[0110] The present invention provides a ground current detection system based on quantum measurement. According to the control module, after the power supply module starts to supply power, the light collection module is controlled to emit laser, so that the NV center detection module is excited by the laser and emits red fluorescence; according to the light collection module, laser is emitted; after being excited by the laser, the NV center detection module emits red fluorescence; through the control module, after the NV center detection module emits red fluorescence, the quantum state manipulation module is controlled to apply a swept frequency microwave field to the NV center detection module, so that the NV center detection module performs frequency matching according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence; through the quantum state manipulation module, after the NV center detection module emits red fluorescence, The NV center detection module applies a swept-frequency microwave field; in the NV center detection module, frequency matching is performed according to the swept-frequency microwave field to generate a change in red fluorescence intensity; through the control module, the light collection module is controlled to detect the change in red fluorescence intensity, so that the light collection module converts the detected change in red fluorescence intensity into a fluorescence intensity signal; and the fluorescence intensity signal is received; according to the light collection module, the detected change in red fluorescence intensity is converted into a fluorescence intensity signal, and the fluorescence intensity signal is transmitted to the control module; finally, the fluorescence intensity signal is received through the control module, the resonance frequency is determined according to the fluorescence intensity signal, and the grounding current of the system to be detected is calculated according to the resonance frequency and a preset vacuum permeability. The NV center detection module is used for quantum measurement and is set in the area where the system to be detected is located. There is no need to connect an ammeter for preparatory work and there are no requirements for the spatial environment. The measurement point can be selected in any area of ​​the system to be detected, which greatly reduces the influence of spatial factors on the selection of measurement points. There is no need to use a clamping tool to measure a fixed position, and the position can be moved at any time during the measurement process, which reduces the risk of operation and improves the safety of detection. At the same time, the control module, quantum state manipulation module, NV center detection module, light collection module and power module work together. The quantum characteristics of the NV center detection module can detect extremely weak signal changes. The quantum state transition is regulated by swept-frequency microwaves to effectively suppress environmental electromagnetic noise, significantly improve the signal-to-noise ratio, ensure the measurement accuracy in complex scenarios, and significantly improve the detection accuracy of the ground current. The quantum state manipulation module applies a swept-frequency microwave field to the NV center detection module and performs frequency matching, so that the change in red fluorescence intensity can be accurately measured. There is a direct correlation between the change in red fluorescence intensity and the ground current, thereby ensuring the accuracy of the measurement results.

[0111] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A ground current detection method based on quantum measurement, characterized in that: A control module suitable for a ground current detection system based on quantum measurement; the ground current detection system based on quantum measurement also includes: a quantum state manipulation module, an NV center detection module, a light collection module and a power supply module; the control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power supply module, and are arranged in the area where the system to be detected is located; The ground current detection method based on quantum measurement includes: After the power supply module starts to supply power, the light collection module is controlled to emit laser, so that the NV center detection module is excited by the laser and emits red fluorescence; After the NV center detection module emits red fluorescence, controlling the quantum state manipulation module to apply a swept frequency microwave field to the NV center detection module, so that the NV center detection module performs frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity; Controlling the light collection module to detect changes in red fluorescence intensity, so that the light collection module converts the detected changes in red fluorescence intensity into a fluorescence intensity signal, and transmits the fluorescence intensity signal to the control module; The fluorescence intensity signal is received, a resonance frequency is determined according to the fluorescence intensity signal, and a ground current of the system to be detected is calculated according to the resonance frequency and a preset vacuum permeability.

2. A ground current detection method based on quantum measurement as claimed in claim 1, characterized in that: The ground current of the system to be detected is calculated according to the resonant frequency and the preset vacuum permeability, including: Obtaining the vertical distance between the ground current detection system based on quantum measurement and the system to be detected; Calculate the magnetic field strength according to the zero field splitting, the electron spin gyromagnetic ratio and the resonance frequency corresponding to the NV center detection module; The ground current of the system to be detected is calculated according to the magnetic field strength, the preset vacuum magnetic permeability and the vertical distance.

3. A ground current detection method based on quantum measurement as claimed in claim 1, characterized in that: The light collection module includes: a laser, a photodetector and an optical element; The laser is used to emit laser light; The photoelectric detector is used to detect the change of red fluorescence intensity and convert the detected change of red fluorescence intensity into a fluorescence intensity signal; The optical element is used to change and guide the optical paths of the laser and the red fluorescent light.

4. A ground current detection method based on quantum measurement as claimed in claim 1, characterized in that: The NV center detection module includes: an NV center probe, a multimode optical fiber and a microwave antenna; The NV center probe is used to emit red fluorescence after being excited by the laser, and to perform frequency matching with the detection power according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence; The multimode optical fiber is used to receive and transmit laser light to the NV center probe, and receive and transmit the change of red fluorescence intensity to the light collection module for detection; The microwave antenna is used to apply the swept-frequency microwave field to the NV center probe.

5. A ground current detection method based on quantum measurement as claimed in claim 1, characterized in that: The quantum state manipulation module includes: a microwave source, a microwave amplifier and an antenna; The microwave source is used to generate an initial frequency-sweeping microwave field according to a preset microwave frequency; The microwave amplifier is used to perform gain amplification according to the microwave power of the initial frequency-sweeping microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, thereby obtaining a final frequency-sweeping microwave field; The antenna is used to transmit the final swept-frequency microwave field to the NV center detection module.

6. A ground current detection method based on quantum measurement as claimed in claim 1, characterized in that: The power module includes: a battery pack, a voltage stabilizer, a DC-DC converter and an overload protection chip; The battery pack is used to provide voltage; The voltage stabilizer is used to output the voltage provided by the battery pack in a stable manner; The DC-DC converter is used to convert the voltage output by the voltage regulator into the operating voltage required by the quantum state manipulation module, the NV center detection module, the light collection module and the control module respectively; The overload protection chip is used to protect the operating voltage of the quantum state manipulation module, the NV center detection module, the light collection module and the control module.

7. A ground current detection system based on quantum measurement, characterized in that: include: Control module, quantum state manipulation module, NV center detection module, light collection module and power module; The control module is connected to the quantum state manipulation module and the light collection module; the NV center detection module is connected to the quantum state manipulation module and the light collection module; the control module, the quantum state manipulation module, the NV center detection module, the light collection module are connected to the power module, and are arranged in the area where the system to be detected is located; The control module is used to control the light collection module to emit laser after the power supply module starts to supply power, so that the NV center detection module is excited by the laser and emits red fluorescence; The light collection module is used to emit laser light; The NV center detection module is used to emit red fluorescence after being excited by laser; The control module is further used to control the quantum state manipulation module to apply a swept-frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence, so that the NV center detection module performs frequency matching according to the swept-frequency microwave field to generate a change in red fluorescence intensity; The quantum state manipulation module is used to apply a swept frequency microwave field to the NV center detection module after the NV center detection module emits red fluorescence; The NV center detection module is further used to perform frequency matching according to the swept frequency microwave field to generate a change in red fluorescence intensity; The control module is further used to control the light collection module to detect the change in red fluorescence intensity, so that the light collection module converts the detected change in red fluorescence intensity into a fluorescence intensity signal; and receives the fluorescence intensity signal; The light collection module is further used to convert the detected red fluorescence intensity change into a fluorescence intensity signal, and transmit the fluorescence intensity signal to the control module; The control module is further used to receive the fluorescence intensity signal, determine the resonance frequency according to the fluorescence intensity signal, and calculate the ground current of the system to be detected according to the resonance frequency and a preset vacuum permeability.

8. A ground current detection system based on quantum measurement as claimed in claim 7, characterized in that: The light collection module includes: a laser, a photodetector and an optical element; The laser is used to emit laser light; The photoelectric detector is used to detect the change of red fluorescence intensity and convert the detected change of red fluorescence intensity into a fluorescence intensity signal; The optical element is used to change and guide the optical paths of the laser and the red fluorescent light.

9. A ground current detection system based on quantum measurement as claimed in claim 7, characterized in that: The NV center detection module includes: an NV center probe, a multimode optical fiber and a microwave antenna; The NV center probe is used to emit red fluorescence after being excited by the laser, and to perform frequency matching with the detection power according to the swept frequency microwave field to generate a change in the intensity of the red fluorescence; The multimode optical fiber is used to receive and transmit laser light to the NV center probe, and receive and transmit the change of red fluorescence intensity to the light collection module for detection; The microwave antenna is used to apply the swept-frequency microwave field to the NV center probe.

10. A ground current detection system based on quantum measurement as claimed in claim 7, characterized in that: The quantum state manipulation module includes: a microwave source, a microwave amplifier and an antenna; The microwave source is used to generate an initial frequency-sweeping microwave field according to a preset microwave frequency; The microwave amplifier is used to perform gain amplification according to the microwave power of the initial frequency-sweeping microwave field, so that the microwave power after gain amplification reaches the detection power of the NV center detection module, thereby obtaining a final frequency-sweeping microwave field; The antenna is used to transmit the final swept-frequency microwave field to the NV center detection module.

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