CN114660512A - Magnetic anomaly detection method, medium and equipment based on diamond NV color center probe - Google Patents
Magnetic anomaly detection method, medium and equipment based on diamond NV color center probe Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims abstract description 165
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- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
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Abstract
The invention discloses a magnetic anomaly detection method, medium and equipment based on a diamond NV color center probe. The method comprises the following steps: 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; and if the first measurement result is consistent with the standard magnetic field model, determining that the target area has no magnetic anomaly, otherwise, determining that the target area has the magnetic anomaly. The method can improve the accuracy of magnetic anomaly detection.
Description
Technical Field
The invention relates to the technical field of magnetic field detection, in particular to a magnetic anomaly detection method, medium and equipment based on a diamond NV color center probe.
Background
The principle of magnetic anomaly detection is based on the self-contained magnetic field of the earth, although the north and south magnetic poles of the earth magnetic field move for tens of kilometers every year and the strength of the earth magnetic field also changes, the earth magnetic field can be regarded as a relatively stable magnetic field system with relatively stable surface magnetic field gradient in local and short time due to the large system volume involved by the earth magnetic field. Generally, the magnetic field gradient on the earth surface is uniformly changed, and when a large mass of metal is gathered at the sea bottom or underground, the uniformity of the magnetic field gradient on the earth surface is influenced, namely, magnetic anomalies are displayed, so that underground metal deposits, submarine sunken vessels, submarines and the like can be detected.
In the related art, the detection equipment mainly adopted for magnetic anomaly detection is a high-precision fluxgate magnetometer, and specifically, the detection method mainly decomposes an earth magnetic field vector to measure the earth magnetic field intensity in three axial directions and the gradient change thereof respectively, and the fluxgate magnetometer can only be used for measuring a magnetic field in a single direction, so that a three-component probe based on the fluxgate magnetometer is provided in the prior art to realize the magnetic anomaly detection scheme. The prior art has the following defects: although the fluxgate magnetometer has high resolution, the overall system error of the three-component fluxgate magnetometer is large, on one hand, because the mechanical structure for installing the fluxgates is difficult to ensure the orthogonality of the three-axis directions, which leads to inaccurate measurement of the magnetic field direction, on the other hand, excitation signals among a plurality of fluxgates interfere with each other to introduce extra noise, which leads to inaccurate measurement of the magnetic field amplitude, and certain defects exist in the applicability.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first purpose of the invention is to provide a magnetic anomaly detection method based on a diamond NV color center probe, so as to improve the accuracy of magnetic anomaly detection.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the invention is to propose an electronic device.
In order to achieve the above purpose, an embodiment of the first aspect of the present invention provides a magnetic anomaly detection method based on a diamond NV color center probe, where 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 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; and if the first measurement result is consistent with the standard magnetic field model, determining that the magnetic anomaly does not exist in the target area, otherwise, determining that the magnetic anomaly exists in the target area.
To achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the above method for detecting magnetic anomalies based on a diamond NV colour centre probe.
In order to achieve the above object, a third embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above method for detecting magnetic anomalies based on a diamond NV color center probe.
According to the magnetic anomaly detection method, medium and equipment based on the diamond NV color center probe, the diamond NV color center probe can be placed at a position to be detected, magnetic field measurement is conducted on the position to be detected according to the pre-obtained magnetic measurement direction of the diamond NV color center probe to obtain a first measurement result, the first measurement result is compared with a standard magnetic field model, if the first measurement result is consistent with the standard magnetic field model, it is determined that magnetic anomaly does not exist, and if the first measurement result is not consistent with the standard magnetic field model, it is determined that magnetic anomaly exists. Therefore, the magnetic anomaly can be detected by adopting the ensemble NV color centers, and the problem of insufficient measurement precision of the whole system caused by errors existing in the process of packaging due to the fact that the orthogonality of all component probes exists when the earth magnetic field is detected by three components in the conventional magnetic measurement is solved because the stable angle relation exists between the axial directions of different NV color centers.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method of magnetic anomaly detection based on a diamond NV color center probe in accordance with one embodiment of the present invention;
FIG. 2 is a flow chart of a method of magnetic anomaly detection based on a diamond NV color center probe according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a method of obtaining a magnetic measurement direction of a diamond NV color center of the present invention;
FIG. 4 is a flow chart of a method for detecting magnetic anomalies based on a diamond NV color center probe according to one example of the present invention.
Detailed Description
The method, medium, and apparatus for detecting magnetic anomalies based on a diamond NV colour centre probe of an embodiment of the present invention are described with reference to the drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described with reference to the drawings are illustrative and should not be construed as limiting the invention.
In recent years, with the rapid development of the technology of the diamond NV color center in the field of magnetic measurement, the magnetic measurement sensitivity of the diamond NV color center can reach fT/Hz1/2And the method has wide prospect in the field of magnetic measurement. The diamond NV color center is in a microstructure, a nitrogen atom replaces a carbon atom in the diamond, a hole around the nitrogen atom is captured to form a quantum system, the quantum control on the spinning of the diamond NV color center can be realized by controlling the input of basic physical quantities such as light, electricity, magnetism and the like, the magnetic field intensity can be calculated by detecting and analyzing the fluorescence output of the diamond NV color center, and the accurate measurement on the magnetic field is realized. Because NV color centers in the ensemble diamond are distributed in 4 different directions, and the included angle between the directions has strict accuracy and stability under the guarantee of the basic principle of quantum mechanics, the NV color centers can accurately measure the direction of a magnetic field. On the basis, the NV color center has extremely high magnetic measurement sensitivity, and the amplitude of the magnetic field can be accurately measured, so that the defects of the fluxgate in the direction and the amplitude of the measured magnetic field are overcome, and the accuracy of magnetic field measurement is improved.
Based on the method, the medium and the equipment, the invention provides a magnetic anomaly detection method based on a diamond NV color center probe.
FIG. 1 is a flow chart of a method for detecting magnetic anomalies based on a diamond NV color center probe in accordance with one embodiment of the present invention.
As shown in fig. 1, the method for detecting magnetic anomaly based on a diamond NV color center probe comprises the following steps:
and S11, determining the magnetic measurement direction of the diamond NV color center probe.
Specifically, before magnetic measurement is performed using the diamond NV colour center probe, it is necessary to first acquire four main axis directions of NV colour centers in the diamond, and take the main axis directions as magnetic measurement directions.
S12, the diamond NV color center probe is placed at the position to be measured, and magnetic field measurement is carried out 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.
Specifically, during the routine magnetic anomaly detection, magnetic field measurement can be performed on the position to be measured, for example, the magnetic field measurement can be performed by using an aircraft carrying the diamond NV color center probe according to a preset flight path or at least a preset flight height, so as to obtain a first measurement result.
In performing the magnetic field measurement, microwaves of different frequencies may be emitted to the diamond, for example, microwaves of four frequencies may be emitted to the diamond. The different frequencies of microwaves may be transmitted to the diamond using one antenna, which may have multiple input interfaces to transmit different frequencies of microwaves to the diamond through the antenna using multiple wave sources. And further receives the fluorescent signals from the probe, which are fluorescent signals from NV colour centres distributed in 4 different directions.
After the fluorescent signal is received, the fluorescent signal is distinguished by a preset method, for example, the fluorescent signal can be distinguished by means of polarization and spatial distribution of the fluorescent light, the fluorescent light with different axes has different polarization and spatial distribution, and for example, the fluorescent signal can be realized by means of frequency modulation of microwaves, the resonance frequency and the microwave frequency of different axes are generally different, different fluorescent frequencies can be obtained under different modulation frequencies, and then the fluorescent signal is distinguished according to the fluorescent frequency.
After the fluorescent signals emitted by the NV color centers in four different directions are distinguished, the deviation between the input microwave frequency and the resonance frequency is calculated according to the intensity of the fluorescent signals, and since the microwave frequency is controlled by a computer and a user, the resonance frequency can be calculated by combining the deviation, so that the magnetic field intensity in the axial direction is calculated according to the resonance frequency, for example, the magnetic field intensity in the axial direction can be obtained according to the preset corresponding relation between the resonance frequency and the magnetic field intensity.
And S13, 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.
Specifically, the standard magnetic field model is a reference model obtained in advance, and represents a magnetic field when there is no abnormality, and may be, for example, an earth magnetic field model. The magnetic field vector in the first measurement is compared to a reference vector in the standard magnetic field model, which is the vector sum of the X, Y, Z triaxial magnetic field components or X, Y, Z triaxial magnetic field components.
And S14, if the first measurement result is consistent with the standard magnetic field model, determining that the magnetic anomaly does not exist in the target area, otherwise, determining that the magnetic anomaly exists in the target area.
From this, can realize utilizing diamond NV color center to detect whether there is magnetic anomaly, because the contained angle of diamond NV color center is very stable, can guarantee the accuracy of magnetic field measurement direction, and do not have mutual interference between the measurement angle of difference, can further promote magnetic field measurement's accuracy.
In one embodiment of the present invention, referring to fig. 2, the determining the magnetic measurement direction of the diamond NV colour center probe comprises:
s21, the diamond NV color center probe is placed in a bias magnetic field with known magnitude and direction.
Specifically, a detection device for detecting the magnetic measurement direction of the NV color center probe may be preset, and a method for detecting the magnetic measurement direction by the detection device may be as shown in fig. 3. When the magnetic measurement direction detection needs to be carried out on the diamond NV color center probe, a bias magnetic field is firstly emitted to the diamond.
S22, emitting a measuring laser and a measuring microwave to the diamond NV color center probe, obtaining a fluorescent signal generated by the diamond NV color center probe, and adjusting the frequency of the measuring microwave until four pairs of resonance frequencies are obtained, wherein each resonance frequency corresponds to a local minimum of fluorescence intensity.
Specifically, because the NV color center of the diamond emits fluorescence when excited by light with a proper wavelength, when a microwave is added to the NV color center, the fluorescence intensity of the NV color center changes, and at a certain microwave frequency, the fluorescence intensity reaches the minimum, that is, a fluorescence intensity peak value corresponding to a certain microwave frequency exists on a fluorescence intensity-microwave frequency correspondence curve. If a magnetic field is applied to the NV color center, the peak of the fluorescence intensity is split into two peaks, and the difference between the two peaks is proportional to the component of the applied magnetic field in the axial direction of the NV color center. Thus, after the diamond is placed in a bias magnetic field, a measuring laser and a measuring microwave can be emitted thereto, and the frequency of the measuring microwave is continuously adjusted. Because the NV color center in each direction reaches the local minimum fluorescence intensity at two microwave frequencies, the detected fluorescence intensity can be monitored in the process of adjusting the microwave frequencies until eight local minimum fluorescence intensities are found, and four pairs of resonance frequencies corresponding to the eight local minimum fluorescence intensities are determined.
Optionally, an adjustment range of the microwave frequency may also be preset, and after the measurement laser and the measurement microwave are emitted to the diamond, the frequency of the measurement microwave is continuously adjusted until the entire adjustment range is covered, so as to find eight local minimum values of the fluorescence intensity according to the measurement result, and determine four pairs of resonance frequencies corresponding to the eight local minimum values of the fluorescence intensity.
And S23, obtaining the magnetic field intensity in the corresponding magnetic measurement direction according to each pair of microwave frequencies, and obtaining the magnetic measurement direction according to the magnetic field intensity and the magnitude and direction of the bias magnetic field.
Optionally, the 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.
If the magnetic measurement directions of the NV color centers in the four different directions cannot be obtained from the four pairs of resonance frequencies, the placement position of the diamond NV color center probe can be adjusted, and the above-described procedure is performed again.
In an embodiment of the present invention, the method for obtaining the standard magnetic field model includes the following steps:
and A1, performing magnetic field measurement on a plurality of positions in the target area through the diamond NV color center probe according to the magnetic measurement direction to obtain a second measurement result, and obtaining a first corresponding relation between the second measurement result and the positions.
Specifically, the diamond NV colour centre probe is placed at a plurality of positions in the target area, and then each position is measured for a plurality of times, for example, a plurality of probes at different positions can be arranged for simultaneous measurement, and for example, one probe can be used for simultaneous measurement while moving. After a plurality of groups of magnetic field measurement results corresponding to each position are obtained, each group of magnetic field measurement results comprises magnetic field measurement results in four directions, the magnetic field measurement results in the four directions are analyzed and processed, and the magnetic field measurement results are converted into a rectangular coordinate system to obtain a second measurement result. For example, an aircraft carrying a diamond NV colour centre probe may be used to repeatedly fly along a predetermined flight path or at least at a predetermined flying height to obtain sets of magnetic field measurements corresponding to each position.
And after a second measurement result is obtained, analyzing the second measurement result, extracting an abnormal value, and taking an average value. For example, if the standard magnetic field model is a model representing the earth magnetic field, the second measurement result may be analyzed by using the property of uniform change of the magnetic field gradient on the earth surface, an abnormal value that obviously does not meet the property in the second measurement result is eliminated, and a plurality of sets of measurement results corresponding to the same position in the remaining measurement results are averaged to obtain the processed second measurement result.
And after the second measurement result is analyzed and processed, binding the processed second measurement result with the position to obtain a first corresponding relation between the second measurement result and the position.
Optionally, when the first corresponding relationship is obtained according to the processed second measurement result, vector synthesis may be performed on the processed second measurement result. That is, the second measurement result in the first correspondence relationship may be the X, Y, Z triaxial magnetic field component or may be a vector after synthesis.
And A2, establishing a standard magnetic field model according to the first corresponding relation.
As an example, if the standard magnetic field model to be established is an earth magnetic field model, the standard magnetic field model may be established by using the uniform change of the magnetic field gradient of the earth magnetic field.
Therefore, the standard magnetic field model can be obtained, and after the first measurement result is obtained through measurement, whether the magnetic anomaly exists or not can be judged according to whether the first measurement result is consistent with the standard magnetic field model or not.
In an embodiment of the invention, if the first measurement result does not match the standard magnetic field model, the method for detecting magnetic anomaly based on the diamond NV color center probe further includes: the first measurement result is compared with a plurality of magnetic anomaly models, and a target object causing magnetic anomaly of the target area is determined according to the comparison result.
Specifically, the magnetic anomaly model is a magnetic field that is acquired in advance and that indicates a different reference detection target, and for example, if the reference detection target is a metal cluster, the magnetic anomaly model corresponding thereto indicates a magnetic field in a target region in the presence of a metal cluster. Further, under the condition that the first measurement result is not in accordance with the standard magnetic field model, if a magnetic anomaly model in accordance with the first measurement result exists, determining that the target object is a reference detection target corresponding to the magnetic anomaly model; and if the magnetic anomaly model which is consistent with the first measurement result does not exist, determining that the target object is an unknown target.
And if the target object is determined to be the reference detection target corresponding to the magnetic anomaly model, the reliability can be remarked according to a preset rule.
The method for acquiring the magnetic anomaly model comprises the following steps:
and B1, after different reference detection targets are placed in the target area, carrying out magnetic field measurement on a plurality of positions in the target area through the diamond NV color center probe according to the magnetic measurement direction to obtain a third measurement result, and obtaining a second corresponding relation among the third measurement result, the positions and the reference detection targets, wherein the reference detection targets are used for enabling the target area to be magnetically abnormal.
And B2, obtaining a magnetic anomaly model according to the second corresponding relation and the standard magnetic field model.
Specifically, various reference detection targets can be manually set in the target area according to actual requirements, for example, if underwater target detection is required in actual application, setting conditions included when the reference detection targets are manually set include: the detection target covers different volumes, qualities, materials and structures, and is in different water depths, motion states and working states during detection. And then, the diamond NV color center probe is used for detecting the reference detection target, for example, an aircraft carrying the diamond NV color center probe can be used for repeatedly flying according to a preset flying path or at least a preset flying height to obtain multiple groups of magnetic field measurement results corresponding to each position, and then a third measurement result corresponding to each position is obtained according to the multiple groups of magnetic field measurement results, so that a second corresponding relation is obtained. And after the second corresponding relation is obtained, a magnetic anomaly model can be obtained according to the second corresponding relation and the standard magnetic field model.
The method for detecting magnetic anomalies based on a diamond NV colour centre probe according to an embodiment of the present invention will be described in detail with reference to a specific example. In this particular example, the standard magnetic field model is the earth magnetic field model.
Specifically, referring to fig. 4, an external magnetic field of defined direction and strength is first set and the diamond NV colour centre probe is placed in the external magnetic field. And adjusting the microwave frequency of the modulated microwave, detecting the fluorescence emitted by the NV color center of the diamond, and obtaining the resonance frequency according to the local minimum value of the fluorescence intensity. The corresponding relation between the resonance frequency and the direction can be preset, so that the magnetic measurement direction of the NV color center can be found according to the resonance frequency, and the magnetic measurement direction is the axial direction of the NV color center. If the magnetic measurement direction of the NV color center cannot be determined by one measurement, the direction of the diamond can be adjusted, and the resonance frequency can be obtained again.
After the magnetic measurement direction is determined, the magnetic field of the earth can be measured by using the diamond NV color center probe, the magnetic field strength of the NV color center in four axial directions is obtained, and the magnetic field strength is converted into a three-dimensional magnetic field strength, so that a second measurement result is obtained. And obtaining magnetic component variation curves of the earth magnetic field in three axial directions of X, Y, Z according to the second measurement result, or obtaining an earth magnetic field vector variation curve, and establishing a standard magnetic field model according to the measurement result.
After the standard magnetic field model is obtained, a reference detection target is arranged in a target area, the diamond NV color center probe is used for detecting the target area after the reference detection target is arranged to obtain a third detection result, and a magnetic anomaly model is established according to the third detection result, the standard magnetic field model and the detected target object.
After a standard magnetic field model and a magnetic anomaly model are established, during daily magnetic anomaly detection, geomagnetic field data are measured in real time, a first measurement result is obtained according to the measured data, the first measurement result is compared with the standard magnetic field model and the magnetic anomaly model, whether magnetic anomaly exists or not is judged, and when the magnetic anomaly exists, a target object with magnetic anomaly in a target area is determined.
To sum up, the method for detecting magnetic anomaly based on the diamond NV color center probe according to the embodiment of the present invention may place the diamond NV color center probe at a to-be-detected position, perform magnetic field measurement on the to-be-detected position according to a pre-obtained magnetic measurement direction of the diamond NV color center probe to obtain a first measurement result, compare the first measurement result with a standard magnetic field model, determine that there is no magnetic anomaly if the first measurement result matches the standard magnetic field model, and determine that there is magnetic anomaly if the first measurement result does not match the standard magnetic field model. Therefore, the magnetic anomaly can be detected by adopting the ensemble NV color center, the miniaturization of equipment is facilitated, a multi-axial magnetic measurement structure is naturally arranged in the ensemble NV color center, and multi-axial magnetic field detection or magnetic field vector information acquisition can be realized by using one probe; in addition, the axial directions of different NV color centers have stable angle relation, so that the problem of insufficient overall measurement accuracy of the system due to the fact that the orthogonality of each component probe has errors in packaging when the earth magnetic field is detected by three components in conventional magnetic measurement is solved. Moreover, if the magnetic anomaly is determined to exist, the first measurement result can be compared with the magnetic anomaly model to determine a target object with magnetic anomaly in the target area, and therefore better magnetic anomaly detection is achieved.
Further, the present invention proposes a computer-readable storage medium.
In an embodiment of the present invention, a computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, the method for detecting a magnetic anomaly based on a diamond NV color center probe as described above is implemented.
When the computer program on the computer-readable storage medium is executed by the processor, the computer program can perform magnetic field measurement on 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 the first measurement result is consistent with the standard magnetic field model, it is determined that magnetic anomaly does not exist, and if the first measurement result is not consistent with the standard magnetic field model, it is determined that magnetic anomaly exists. Therefore, the magnetic anomaly can be detected by adopting the ensemble NV color center, the miniaturization of equipment is facilitated, a multi-axial magnetic measurement structure is naturally arranged in the ensemble NV color center, and multi-axial magnetic field detection or magnetic field vector information acquisition can be realized by using one probe; in addition, the axial directions of different NV color centers have stable angle relation, so that the problem of insufficient overall measurement precision of the system caused by errors existing in the packaging process of orthogonality of all component probes when three components are adopted for detecting the earth magnetic field in conventional magnetic measurement is solved. Moreover, if the magnetic anomaly is determined to exist, the first measurement result can be compared with the magnetic anomaly model to determine a target object with magnetic anomaly in the target area, and therefore better magnetic anomaly detection is achieved.
Further, the invention provides an electronic device.
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, and when the processor executes the computer program, the method for detecting a magnetic anomaly based on a diamond NV color center probe as described above is implemented.
According to the electronic equipment provided by the embodiment of the invention, by implementing the magnetic anomaly detection method based on the diamond NV color center probe, magnetic field measurement can be carried out on the position to be measured according to the pre-obtained magnetic measurement direction of the diamond NV color center probe to obtain a first measurement result, the first measurement result is compared with a standard magnetic field model, if the first measurement result is consistent with the standard magnetic field model, the magnetic anomaly is determined to be absent, and if the first measurement result is inconsistent with the standard magnetic field model, the magnetic anomaly is determined to be present. Therefore, the magnetic anomaly can be detected by adopting the ensemble NV color center, the miniaturization of equipment is facilitated, a multi-axial magnetic measurement structure is naturally arranged in the ensemble NV color center, and multi-axial magnetic field detection or magnetic field vector information acquisition can be realized by using one probe; in addition, the axial directions of different NV color centers have stable angle relation, so that the problem of insufficient overall measurement accuracy of the system due to the fact that the orthogonality of each component probe has errors in packaging when the earth magnetic field is detected by three components in conventional magnetic measurement is solved. Moreover, if the magnetic anomaly is determined to exist, the first measurement result can be compared with the magnetic anomaly model to determine a target object with magnetic anomaly in the target area, and therefore better magnetic anomaly detection is achieved.
It should be noted that the logic and/or steps illustrated in the flowcharts or otherwise described herein may be considered as a sequential list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may 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 an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description herein, the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like refer to orientations and positional relationships based on the orientation shown in the drawings, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description of the present specification, unless otherwise specified, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A magnetic anomaly detection method based on a diamond NV color center probe is characterized by comprising the following steps:
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 carrying out 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;
and if the first measurement result is consistent with the standard magnetic field model, determining that the magnetic anomaly does not exist in the target area, otherwise, determining that the magnetic anomaly exists in the target area.
2. The method of claim 1, wherein the comparing the first measurement result with a standard magnetic field model corresponding to the target region comprises:
comparing the magnetic field vector in the first measurement with a reference vector in the standard magnetic field model.
3. The method of claim 2, wherein the reference vector is a vector sum of X, Y, Z triaxial magnetic field components or X, Y, Z triaxial magnetic field components.
4. The method for detecting the magnetic anomaly based on the NV color center of the diamond according to claim 1, wherein the step of determining the magnetic measurement direction of the NV color center probe of the diamond comprises the following steps:
placing the diamond NV color center probe in a bias magnetic field with known size and direction;
emitting measurement laser and measurement microwaves to the diamond NV color center probe to obtain a fluorescence signal generated by the diamond NV color center probe, and adjusting the frequency of the measurement microwaves until four pairs of resonance frequencies are obtained, wherein each resonance frequency corresponds to a local minimum of fluorescence intensity;
and obtaining the magnetic field intensity in the corresponding magnetic measurement direction according to each pair of microwave frequencies, and obtaining the magnetic measurement direction according to the magnetic field intensity and the magnitude and direction of the bias magnetic field.
5. The method for detecting magnetic anomaly based on the diamond NV color center probe, according to claim 1, wherein the method for obtaining the standard magnetic field model comprises the following steps:
carrying out magnetic field measurement on a plurality of positions in a target area through the diamond NV color center probe according to the magnetic measurement direction to obtain a second measurement result, and obtaining a first corresponding relation between the second measurement result and the positions;
and establishing the standard magnetic field model according to the first corresponding relation.
6. The method of claim 5, wherein if the first measurement does not match the standard magnetic field model, the method further comprises:
and comparing the first measurement result with a plurality of magnetic anomaly models, and determining a target object causing the magnetic anomaly of the target area according to the comparison result.
7. The method for detecting magnetic anomaly based on a diamond NV color center probe, according to claim 6, wherein the step of determining the target object causing the magnetic anomaly of the target area according to the comparison result comprises the following steps:
if a magnetic anomaly model conforming to the first measurement result exists, determining the target object as a reference detection target corresponding to the magnetic anomaly model;
and if the magnetic anomaly model which is consistent with the first measurement result does not exist, determining that the target object is an unknown target.
8. The method for detecting the magnetic anomaly based on the diamond NV color center probe, according to claim 6, wherein the method for obtaining the magnetic anomaly model comprises the following steps:
after different reference detection targets are placed in the target area, performing magnetic field measurement on a plurality of positions in the target area through the diamond NV color center probe according to the magnetic measurement direction to obtain a third measurement result, and obtaining a second corresponding relation among the third measurement result, the positions and the reference detection targets, wherein the reference detection targets are used for enabling the target area to be magnetically abnormal;
and obtaining the magnetic anomaly model according to the second corresponding relation and the standard magnetic field model.
9. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a diamond NV colour centre probe based magnetic anomaly detection method according to any one of claims 1-8.
10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, when executing the computer program, implementing a method of magnetic anomaly detection based on a diamond NV colour centre probe according to any one of claims 1-8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116755006A (en) * | 2023-08-18 | 2023-09-15 | 无锡量子感知技术有限公司 | Method and device for determining magnetic field of permanent magnet |
| CN116859300A (en) * | 2023-09-01 | 2023-10-10 | 华中科技大学 | Quantum sensing frequency tracking control method and system based on diamond NV color center |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116755006A (en) * | 2023-08-18 | 2023-09-15 | 无锡量子感知技术有限公司 | Method and device for determining magnetic field of permanent magnet |
| CN116755006B (en) * | 2023-08-18 | 2023-11-14 | 无锡量子感知技术有限公司 | Method and device for determining magnetic field of permanent magnet |
| CN116859300A (en) * | 2023-09-01 | 2023-10-10 | 华中科技大学 | Quantum sensing frequency tracking control method and system based on diamond NV color center |
| CN116859300B (en) * | 2023-09-01 | 2023-11-17 | 华中科技大学 | Quantum sensing frequency tracking control method and system based on diamond NV color center |
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