Magnetic anomaly detection method, medium, and equipment based on diamond NV color center probe

Abstract

The present invention discloses a magnetic anomaly detection method, medium, and device based on a diamond NV color center probe. The method includes: determining the magnetic measurement direction of the diamond NV color center probe; placing the diamond NV color center probe at a position to be measured, and performing magnetic field measurement on the position to be measured using the diamond NV color center probe according to the magnetic measurement direction to obtain a first measurement result; comparing the first measurement result with a standard magnetic field model corresponding to a target area, wherein the position to be measured is within the target area; if the first measurement result is consistent with the standard magnetic field model, it is determined that no magnetic anomaly exists in the target area; otherwise, it is determined that a magnetic anomaly exists in the target area. This method can improve the accuracy of magnetic anomaly detection.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic field detection, and in particular to a magnetic anomaly detection method, medium, and equipment based on a diamond NV color center probe. Background Art

[0002] The principle of magnetic anomaly detection is based on the Earth's inherent magnetic field. Although the north and south poles of the Earth's magnetic field move dozens of kilometers each year and the strength of the Earth's magnetic field also fluctuates, due to the large volume of the system involved in the Earth's magnetic field, the Earth's magnetic field can be considered a relatively stable magnetic field system in local areas and short periods of time, with a relatively stable surface magnetic field gradient. Normally, the Earth's surface magnetic field gradient varies uniformly. When a large amount of metal accumulates on the seabed or underground, it affects the uniformity of the Earth's surface magnetic field gradient, indicating a magnetic anomaly. This allows the detection of underground metal deposits, as well as submarine shipwrecks and submarines.

[0003] In the related art, the main detection equipment used for magnetic anomaly detection is a high-precision fluxgate magnetometer. Specifically, the mainstream detection method is to decompose the earth's magnetic field vector and measure the earth's magnetic field strength and its gradient changes in three axes respectively. The fluxgate magnetometer can only be used to measure the magnetic field in a single direction. Therefore, a three-component probe based on the fluxgate magnetometer is proposed in the prior art to realize the above-mentioned magnetic anomaly detection scheme. The shortcomings of the above-mentioned prior art are: although the fluxgate magnetometer itself has a high resolution, the overall system error of the three-component fluxgate magnetometer is large. On the one hand, this is because the mechanical structure of the fluxgate installation is difficult to ensure the orthogonality of the three-axis direction, resulting in inaccurate measurement of the magnetic field direction. On the other hand, the excitation signals between multiple fluxgates will interfere with each other and introduce additional noise, resulting in inaccurate measurement of the magnetic field amplitude. There are certain deficiencies in applicability. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, a first object of the present invention is to propose a magnetic anomaly detection method based on a diamond NV color center probe to improve the accuracy of magnetic anomaly detection.

[0005] A second object of the present invention is to provide a computer-readable storage medium.

[0006] A third object of the present invention is to provide an electronic device.

[0007] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a magnetic anomaly detection method based on a diamond NV color center probe, the method comprising: determining the magnetic measurement direction of the diamond NV color center probe; placing the diamond NV color center probe at a position to be measured, and performing magnetic field measurement on the position to be measured through the diamond NV color center probe according to the magnetic measurement direction to obtain a first measurement result; comparing the first measurement result with a standard magnetic field model corresponding to a target area, wherein the position to be measured is in the target area; if the first measurement result is consistent with the standard magnetic field model, it is determined that there is no magnetic anomaly in the target area, otherwise it is determined that there is a magnetic anomaly in the target area.

[0008] To achieve the above objectives, a second embodiment of the present invention proposes a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned magnetic anomaly detection method based on a diamond NV color center probe is implemented.

[0009] To achieve the above-mentioned objectives, the third aspect of the present invention proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the above-mentioned magnetic anomaly detection method based on the diamond NV color center probe is implemented.

[0010] The magnetic anomaly detection method, medium, and device based on the diamond NV color center probe of the embodiment of the present invention can place the diamond NV color center probe at the position to be measured, and measure the magnetic field of the position to be measured according to the pre-acquired magnetic measurement direction of the diamond NV color center probe to obtain a first measurement result, and compare the first measurement result with the standard magnetic field model. If they match, it is determined that there is no magnetic anomaly; if they do not match, it is determined that there is a magnetic anomaly. In this way, it is possible to detect magnetic anomalies using an ensemble NV color center. Since the axes of different NV color centers have a stable angular relationship, this avoids the problem of insufficient overall measurement accuracy of the system due to errors in the orthogonality of each component probe during packaging when conventional magnetic measurements use three components to detect the earth's magnetic field.

[0011] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a flow chart of a magnetic anomaly detection method based on a diamond NV color center probe according to an embodiment of the present invention;

[0013] Figure 2 is a flow chart of a magnetic anomaly detection method based on a diamond NV color center probe according to another embodiment of the present invention;

[0014] Figure 3 Schematic diagram of a method for obtaining the magnetic measurement direction of a diamond NV color center according to an example of the present invention;

[0015] Figure 4 This is a flow chart of a magnetic anomaly detection method based on a diamond NV color center probe, which is an example of the present invention. DETAILED DESCRIPTION

[0016] The following describes, with reference to the accompanying drawings, a magnetic anomaly detection method, medium, and apparatus based on a diamond NV color center probe according to embodiments of the present invention. Throughout, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions. The embodiments described with reference to the accompanying drawings are illustrative only and are not to be construed as limiting the present invention.

[0017] In recent years, with the rapid development of technology in the field of magnetic measurement of diamond NV color centers, the magnetic measurement sensitivity of diamond NV color centers can reach fT / Hz. 1 / 2 The diamond NV color center has broad prospects in the field of magnetic measurement. Microscopically, a diamond NV color center is a quantum system formed by a nitrogen atom replacing a carbon atom in diamond and capturing a surrounding vacancy. By controlling the input of fundamental physical quantities such as light, electricity, and magnetism, the spin of the diamond NV color center can be quantum manipulated. By detecting and analyzing the fluorescence output of the diamond NV color center, the magnetic field strength can be calculated, enabling precise measurement of the magnetic field. Because the NV color centers within the ensemble diamond are distributed in four different directions, and the angles between these directions are strictly accurate and stable under the basic principles of quantum mechanics, the NV color center can accurately measure the direction of the magnetic field. Based on this, the NV color center has extremely high magnetic measurement sensitivity and can accurately measure the amplitude of the magnetic field, thereby improving the shortcomings of the fluxgate in measuring magnetic field direction and amplitude and improving the accuracy of magnetic field measurement.

[0018] Based on this, the present invention proposes a magnetic anomaly detection method, medium, and equipment based on a diamond NV color center probe.

[0019] Figure 1 The present invention is a flowchart of a method for detecting magnetic anomaly based on a diamond NV color center probe according to an embodiment of the present invention.

[0020] like Figure 1 As shown, the magnetic anomaly detection method based on the diamond NV color center probe includes:

[0021] S11, determine the magnetic measurement direction of the diamond NV color center probe.

[0022] Specifically, before performing magnetic measurement using the diamond NV color center probe, it is necessary to first obtain the four main axis directions of the NV color center in the diamond, and use the main axis directions as magnetic measurement directions.

[0023] S12, placing the diamond NV color center probe at a position to be measured, and measuring the magnetic field at the position to be measured through the diamond NV color center probe according to a magnetic measurement direction to obtain a first measurement result.

[0024] Specifically, during routine magnetic anomaly detection, magnetic field measurements can be performed on the measured location. For example, the diamond NV color center probe can be carried on an aircraft to perform magnetic field measurements along a preset flight path or at least a predetermined flight altitude to obtain a first measurement result.

[0025] When measuring the magnetic field, microwaves of different frequencies can be emitted into the diamond. For example, four frequencies can be emitted. These microwaves can be transmitted using a single antenna. This antenna can have multiple input interfaces, allowing multiple wave sources to transmit microwaves of different frequencies through the antenna. Fluorescence signals emitted by the probe are then received. These fluorescence signals are generated by NV centers distributed in four different directions.

[0026] After receiving the fluorescence signal, a preset method is used to distinguish the fluorescence signal. For example, the fluorescence can be distinguished by its polarization and spatial distribution. Fluorescence on different axes has different polarization and spatial distribution. For another example, it can be achieved by frequency modulation of microwaves. The resonant frequencies and microwave frequencies of different axes are generally different. There will be different fluorescence frequencies under different modulation frequencies, and then the signal can be distinguished based on the fluorescence frequency.

[0027] After distinguishing the fluorescence signals emitted by the NV color centers in four different directions, the deviation between the input microwave frequency and the resonance frequency is calculated based on the intensity of the fluorescence signal. Since the microwave frequency is controlled by the computer and the user, the resonance frequency can be calculated based on the deviation, and the magnetic field strength in the axis direction can be calculated based on the resonance frequency. For example, the magnetic field strength in the axis direction can be obtained based on the correspondence between the preset resonance frequency and the magnetic field strength.

[0028] S13: Compare the first measurement result with a standard magnetic field model corresponding to the target area, wherein the position to be measured is in the target area.

[0029] Specifically, the standard magnetic field model is a pre-acquired reference model representing the magnetic field in the absence of anomalies. For example, the standard magnetic field model may be the Earth's magnetic field model. The magnetic field vector in the first measurement result is compared with a reference vector in the standard magnetic field model. The reference vector is the magnetic field components along the X, Y, and Z axes, or the vector sum of the magnetic field components along the X, Y, and Z axes.

[0030] S14, if the first measurement result is consistent with the standard magnetic field model, it is determined that there is no magnetic anomaly in the target area; otherwise, it is determined that there is a magnetic anomaly in the target area.

[0031] Therefore, it is possible to use diamond NV color centers to detect whether there are magnetic anomalies. Since the angle of the diamond NV color center is very stable, the accuracy of the magnetic field measurement direction can be guaranteed, and there is no mutual interference between different measurement angles, which can further improve the accuracy of the magnetic field measurement.

[0032] In one embodiment of the present invention, see Figure 2 The above-mentioned determination of the magnetic measurement direction of the diamond NV color center probe includes:

[0033] S21, placing the diamond NV color center probe in a bias magnetic field of known magnitude and direction.

[0034] Specifically, a detection device for the magnetic measurement direction of the NV color center probe can be pre-set. The method for detecting the magnetic measurement direction of the detection device can be found in Figure 3 When it is necessary to perform magnetic measurement direction detection on a diamond NV color center probe, a bias magnetic field is first emitted to the diamond.

[0035] S22, emitting a measurement laser and a measurement microwave to the diamond NV color center probe, obtaining a fluorescence signal generated by the diamond NV color center probe, and adjusting the frequency of the measurement microwave until four pairs of resonance frequencies are obtained, where each resonance frequency corresponds to a local minimum of the fluorescence intensity.

[0036] Specifically, since the diamond NV color center will emit fluorescence when excited by light of a suitable wavelength, when a microwave is applied to the NV color center, the fluorescence intensity of the NV color center will change, and at a certain microwave frequency, the fluorescence intensity will reach a minimum, that is, there is a fluorescence intensity peak corresponding to a certain microwave frequency on the fluorescence intensity-microwave frequency correspondence curve. If a magnetic field is applied to the NV color center, the fluorescence intensity peak will split into two, and the microwave frequency difference between the two peaks is proportional to the component of the external magnetic field in the axial direction of the NV color center. Therefore, after the diamond is placed in a bias magnetic field, a measurement laser and a measurement microwave can be emitted to it, and the frequency of the measurement microwave can be continuously adjusted. Since the NV color center in each direction will reach a local minimum fluorescence intensity at two microwave frequencies, the fluorescence intensity detected can be monitored during the process of adjusting the microwave frequency until eight local minimum values ​​of fluorescence intensity are found, and four pairs of resonant frequencies corresponding to the eight local minimum values ​​of fluorescence intensity are determined.

[0037] Optionally, the adjustment range of the microwave frequency can be pre-set. After emitting the measurement laser and the measurement microwave to the diamond, the frequency of the measurement microwave is continuously adjusted until the entire adjustment range is covered, thereby finding eight local minima of fluorescence intensity based on the measurement results and determining four pairs of resonant frequencies corresponding to the eight local minima of fluorescence intensity.

[0038] S23, obtaining the magnetic field strength in the corresponding magnetic measurement direction according to each pair of microwave frequencies, and obtaining the magnetic measurement direction according to the magnetic field strength and the magnitude and direction of the bias magnetic field.

[0039] Optionally, a corresponding relationship between the resonance frequency and the magnetic measurement direction may be pre-established, and then after the resonance frequency is obtained, the magnetic measurement direction may be determined by looking up a table.

[0040] It should be noted that if the magnetic measurement directions of the NV color center in four different directions cannot be obtained according to the above four pairs of resonant frequencies, the placement of the diamond NV color center probe can be adjusted and the above process can be carried out again.

[0041] In one embodiment of the present invention, the method for obtaining the standard magnetic field model includes the following steps:

[0042] A1. Perform magnetic field measurement on multiple positions in the target area using a diamond NV color center probe according to a magnetic measurement direction to obtain a second measurement result, and obtain a first corresponding relationship between the second measurement result and the position.

[0043] Specifically, a diamond NV color center probe is placed at multiple locations in the target area, and multiple measurements are performed on each location. For example, probes at multiple different locations can be set up for simultaneous measurement, or a single probe can be used for measurement while moving. After obtaining multiple sets of magnetic field measurement results corresponding to each location, each set of magnetic field measurement results includes magnetic field measurement results in four directions, and the magnetic field measurement results in the four directions are analyzed and processed, and converted to a rectangular coordinate system to obtain a second measurement result. For example, an aircraft can be used to carry a diamond NV color center probe and repeatedly fly along a preset flight path or at least a predetermined flight altitude to obtain multiple sets of magnetic field measurement results corresponding to each location.

[0044] After obtaining the second measurement result, the second measurement result is analyzed, outliers are identified, and an average is calculated. For example, if the standard magnetic field model represents the Earth's magnetic field, the second measurement result can be analyzed using the characteristic that the magnetic field gradient on the Earth's surface varies uniformly. Outliers in the second measurement result that clearly do not conform to this characteristic are eliminated, and the average of multiple groups of measurement results corresponding to the same location in the remaining measurement results is calculated to obtain the processed second measurement result.

[0045] After analyzing and processing the second measurement result, the processed second measurement result is bound to the position to obtain a first corresponding relationship between the second measurement result and the position.

[0046] Optionally, when the first correspondence is obtained based on the processed second measurement result, the processed second measurement result can also be vector synthesized. That is, the second measurement result in the first correspondence can be the magnetic field components along the X, Y, and Z axes, or a synthesized vector.

[0047] A2. Establish a standard magnetic field model based on the first corresponding relationship.

[0048] As an example, if the standard magnetic field model to be established is the Earth's magnetic field model, the standard magnetic field model can be established by utilizing the uniform change of the magnetic field gradient of the Earth's magnetic field.

[0049] In this way, a standard magnetic field model can be obtained, so that after obtaining a first measurement result, whether a magnetic anomaly exists can be determined based on whether the first measurement result is consistent with the standard magnetic field model.

[0050] In one embodiment of the present invention, if the first measurement result does not conform to the standard magnetic field model, the above-mentioned magnetic anomaly detection method based on the diamond NV color center probe further includes: comparing the first measurement result with multiple magnetic anomaly models, and determining the target object causing the magnetic anomaly in the target area based on the comparison result.

[0051] Specifically, the magnetic anomaly model is a pre-acquired representation of the magnetic field under different benchmark detection targets. For example, if the benchmark detection target is a metal agglomerate, the corresponding magnetic anomaly model represents the magnetic field of the target area in the presence of metal agglomerates. Furthermore, if the first measurement result does not match the standard magnetic field model, if a magnetic anomaly model that matches the first measurement result exists, the target object is determined to be the benchmark detection target corresponding to that magnetic anomaly model; if no magnetic anomaly model that matches the first measurement result exists, the target object is determined to be an unknown target.

[0052] Furthermore, if the target object is determined to be a reference detection target corresponding to the magnetic anomaly model, the credibility can also be noted according to preset rules.

[0053] The method for obtaining the magnetic anomaly model includes the following steps:

[0054] B1. After placing different reference detection targets in the target area, the magnetic field is measured at multiple positions in the target area using a diamond NV color center probe according to the magnetic measurement direction to obtain a third measurement result, and a second correspondence between the third measurement result, the position, and the reference detection target is obtained, wherein the reference detection target is used to make the target area magnetically abnormal.

[0055] B2, obtain the magnetic anomaly model based on the second corresponding relationship and the standard magnetic field model.

[0056] Specifically, various types of benchmark detection targets can be artificially set in the target area according to actual needs. For example, if underwater target detection is required in actual applications, the setting conditions included in the artificial setting of the benchmark detection target include: the detection target should cover different volumes, masses, materials, and structures, and the detection target should be in different water depths, motion states, and working states during detection. The benchmark detection target is then detected using a diamond NV color center probe. For example, an aircraft can be used to carry a diamond NV color center probe and fly repeatedly according to a preset flight path or at least a predetermined flight altitude to obtain multiple sets of magnetic field measurement results corresponding to each position, and then a third measurement result corresponding to each position is obtained based on the multiple sets of magnetic field measurement results, thereby obtaining a second corresponding relationship. After obtaining the second corresponding relationship, a magnetic anomaly model can be obtained based on the second corresponding relationship and the standard magnetic field model.

[0057] The magnetic anomaly detection method based on a diamond NV color center probe according to an embodiment of the present invention is described in detail below with reference to a specific example. In this specific example, the standard magnetic field model is the Earth's magnetic field model.

[0058] Specifically, see Figure 4 First, an external magnetic field of defined direction and intensity is set, and the diamond NV center probe is placed within this field. The microwave frequency of the modulated microwave is adjusted, and the fluorescence emitted by the diamond NV center is detected. The resonant frequency is determined based on the local minimum of the fluorescence intensity. The correspondence between the resonant frequency and direction can be pre-set, so that the magnetic measurement direction of the NV center can be determined based on the resonant frequency. This magnetic measurement direction is the axial direction of the NV center. Furthermore, if the magnetic measurement direction of the NV center cannot be determined in a single measurement, the orientation of the diamond can be adjusted and the resonant frequency can be determined again.

[0059] After determining the magnetic measurement direction, the diamond NV center probe can be used to measure the Earth's magnetic field, obtaining the magnetic field strength along the four axes of the NV center. This is then converted into three-dimensional magnetic field strength, yielding a second measurement result. Based on this second measurement result, a curve of the Earth's magnetic field components along the X, Y, and Z axes, or a curve of the Earth's magnetic field vector, is obtained. A standard magnetic field model is then established based on the measurement results.

[0060] After obtaining the standard magnetic field model, a benchmark detection target is set in the target area, and the diamond NV color center probe is used to detect the target area after setting the benchmark detection target to obtain a third detection result. A magnetic anomaly model is established based on the third detection result, the standard magnetic field model, and the detected target object.

[0061] After establishing the standard magnetic field model and the magnetic anomaly model, during daily magnetic anomaly detection, the geomagnetic field data is measured in real time, and a first measurement result is obtained based on the measured data. The first measurement result is compared with the standard magnetic field model and the magnetic anomaly model to determine whether there is a magnetic anomaly, and when there is a magnetic anomaly, the target object of the magnetic anomaly in the target area is determined.

[0062] In summary, the magnetic anomaly detection method based on the diamond NV color center probe of the embodiment of the present invention can place the diamond NV color center probe at the position to be measured, and measure the magnetic field of the position to be measured according to the magnetic measurement direction of the diamond NV color center probe obtained in advance to obtain a first measurement result, and compare the first measurement result with the standard magnetic field model. If they match, it is determined that there is no magnetic anomaly; if they do not match, it is determined that there is a magnetic anomaly. Thus, it is possible to detect magnetic anomalies using the ensemble NV color center, which is not only conducive to the miniaturization of the equipment, but also because the ensemble NV color center naturally has a multi-axial magnetic measurement structure, and a probe can be used to achieve multi-axial magnetic field detection or obtain magnetic field vector information; in addition, there is a stable angular relationship between the axes of different NV color centers, which avoids the problem of insufficient overall measurement accuracy of the system due to errors in the orthogonality of each component probe during packaging when conventional magnetic measurements use three components to detect the earth's magnetic field. Moreover, if it is determined that there is a magnetic anomaly, the first measurement result can also be compared with the magnetic anomaly model to determine the target object of the magnetic anomaly in the target area, thereby achieving better magnetic anomaly detection.

[0063] Furthermore, the present invention provides a computer-readable storage medium.

[0064] In an embodiment of the present invention, a computer program is stored on a computer-readable storage medium. When the computer program is executed by a processor, the above-mentioned magnetic anomaly detection method based on a diamond NV color center probe is implemented.

[0065] The computer-readable storage medium of an embodiment of the present invention, when the computer program thereon is executed by a processor, can measure the magnetic field of the position to be measured according to the magnetic measurement direction of the pre-acquired diamond NV color center probe to obtain a first measurement result, and compare the first measurement result with the standard magnetic field model. If they match, it is determined that there is no magnetic anomaly; if they do not match, it is determined that there is a magnetic anomaly. Thus, it is possible to detect magnetic anomalies using the ensemble NV color center, which is not only conducive to the miniaturization of the equipment, but also because the ensemble NV color center naturally has a multi-axial magnetic measurement structure, and a probe can be used to achieve multi-axial magnetic field detection or obtain magnetic field vector information; in addition, there is a stable angular relationship between the axes of different NV color centers, which avoids the problem of insufficient overall measurement accuracy of the system due to errors in the orthogonality of each component probe during packaging when conventional magnetic measurements use three components to detect the earth's magnetic field. Moreover, if it is determined that there is a magnetic anomaly, the first measurement result can also be compared with the magnetic anomaly model to determine the target object of the magnetic anomaly in the target area, thereby achieving better magnetic anomaly detection.

[0066] Furthermore, the present invention provides an electronic device.

[0067] In an embodiment of the present invention, the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned magnetic anomaly detection method based on the diamond NV color center probe is implemented.

[0068] The electronic device of the embodiment of the present invention, by implementing the above-mentioned magnetic anomaly detection method based on the diamond NV color center probe, can measure the magnetic field of the position to be measured according to the magnetic measurement direction of the diamond NV color center probe obtained in advance to obtain a first measurement result, and compare the first measurement result with the standard magnetic field model. If they match, it is determined that there is no magnetic anomaly; if they do not match, it is determined that there is a magnetic anomaly. Thus, it is possible to detect magnetic anomalies using the ensemble NV color center, which is not only conducive to the miniaturization of the equipment, but also because the ensemble NV color center naturally has a multi-axial magnetic measurement structure, and a probe can be used to achieve multi-axial magnetic field detection or obtain magnetic field vector information; in addition, there is a stable angular relationship between the axes of different NV color centers, which avoids the problem of insufficient overall measurement accuracy of the system due to errors in the orthogonality of each component probe during packaging when conventional magnetic measurements use three components to detect the earth's magnetic field. Moreover, if it is determined that there is a magnetic anomaly, the first measurement result can also be compared with the magnetic anomaly model to determine the target object of the magnetic anomaly in the target area, thereby achieving better magnetic anomaly detection.

[0069] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such an instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0070] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0071] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0072] In the description of this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0074] In the description of this specification, unless otherwise specified, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0075] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0076] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A magnetic anomaly detection method based on a diamond NV color center probe, characterized in that: The method comprises: Determine the magnetic measurement direction of the diamond NV color center probe; placing the diamond NV color center probe at a position to be measured, and measuring the magnetic field of the position to be measured by the diamond NV color center probe according to the magnetic measurement direction to obtain a first measurement result; comparing the first measurement result with a standard magnetic field model corresponding to a target area, wherein the position to be measured is in the target area; If the first measurement result is consistent with the standard magnetic field model, it is determined that there is no magnetic anomaly in the target area; otherwise, it is determined that there is a magnetic anomaly in the target area; Determining the magnetic measurement direction of the diamond NV color center probe includes: placing the diamond NV color center probe in a bias magnetic field of known magnitude and direction; emitting a measurement laser and a measurement microwave toward the diamond NV color center probe, acquiring a fluorescence signal generated by the diamond NV color center probe, and adjusting the frequency of the measurement microwave until four pairs of resonance frequencies are obtained, wherein each resonance frequency corresponds to a local minimum of fluorescence intensity; Obtaining a magnetic field strength in a corresponding magnetic measurement direction according to each pair of microwave frequencies, and obtaining the magnetic measurement direction according to the magnetic field strength and the magnitude and direction of the bias magnetic field; The step of measuring the magnetic field of the position to be measured by the diamond NV color center probe according to the magnetic measurement direction to obtain a first measurement result includes: Microwaves of four frequencies are emitted to the diamond in the diamond NV color center probe, fluorescence signals emitted by the diamond NV color center probe are received, and the fluorescence signals emitted by the NV color center in four different directions are distinguished according to the polarization and spatial distribution of the fluorescence signals, or different frequency modulation is performed on the microwaves of the four frequencies. The deviation between the microwave frequency and the resonance frequency is obtained according to the distinguished fluorescence signals, the magnetic field strength in different directions is obtained according to the deviation, and the magnetic field strength is used as the first measurement result.

2. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 1, characterized in that: The comparing the first measurement result with a standard magnetic field model corresponding to the target area includes: The magnetic field vector in the first measurement result is compared with a reference vector in the standard magnetic field model.

3. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 2, characterized in that: The reference vector is the magnetic field components in the X, Y, and Z axes or the vector sum of the magnetic field components in the X, Y, and Z axes.

4. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 1, characterized in that: The method for obtaining the standard magnetic field model includes: performing magnetic field measurement at a plurality of positions in the target area using the diamond NV color center probe according to the magnetic measurement direction to obtain a second measurement result, and obtaining a first corresponding relationship between the second measurement result and the position; The standard magnetic field model is established according to the first corresponding relationship.

5. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 4, characterized in that: If the first measurement result does not conform to the standard magnetic field model, the method further includes: The first measurement result is compared with a plurality of magnetic anomaly models, and a target object causing the magnetic anomaly in the target area is determined according to the comparison result.

6. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 5, characterized in that: Determining the target object causing the magnetic anomaly in the target area according to the comparison result includes: If there is a magnetic anomaly model that matches the first measurement result, determining the target object as a reference detection target corresponding to the magnetic anomaly model; If there is no magnetic anomaly model that matches the first measurement result, the target object is determined to be an unknown target.

7. The magnetic anomaly detection method based on a diamond NV color center probe according to claim 5, characterized in that: The method for obtaining the magnetic anomaly model includes: After placing different reference detection targets in the target area, performing magnetic field measurements at multiple locations in the target area using the diamond NV color center probe according to the magnetic measurement direction to obtain a third measurement result, and obtaining a second correspondence between the third measurement result, the location, and the reference detection target, wherein the reference detection target is used to cause magnetic anomaly in the target area; The magnetic anomaly model is obtained according to the second corresponding relationship and the standard magnetic field model.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the magnetic anomaly detection method based on a diamond NV color center probe according to any one of claims 1 to 7 is implemented.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for detecting magnetic anomalies based on a diamond NV color center probe according to any one of claims 1 to 7 is implemented.

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