Aeromagnetic measuring device based on NV color center magnetometer

Abstract

The invention relates to the technical field of aeromagnetic measurement, in particular to an aeromagnetic measurement device based on an NV color center magnetometer, which comprises an aircraft, the NV color center magnetometer, a positioning module, a local storage module and a mobile power supply, the NV magnetometer can achieve nT-level high-sensitivity magnetic field detection at normal temperature based on the nitrogen-vacancy color center quantum effect, does not need a complex temperature control system of a traditional optical pump magnetometer, is lower in power consumption and smaller in size, is adaptive to a lightweight unmanned aerial vehicle platform, can directly obtain three-dimensional magnetic field data through the multi-axis vector measurement capability, improves the target space analysis precision, and is suitable for large-scale popularization and application. Moreover, the system is high in electromagnetic interference resistance, is suitable for a complex electromagnetic environment, supports transient field detection through the broadband characteristic, and provides a high-resolution solution for resource exploration and military reconnaissance.

Description

Technical Field

[0001] The invention relates to the field of aeromagnetic measurement, in particular to an aeromagnetic measurement device based on an NV color center magnetometer. Background Art

[0002] Aeromagnetic surveying is a geophysical exploration technology based on magnetometers mounted on flying platforms (such as airplanes and drones). It analyzes the magnetic differences of underground materials by collecting geomagnetic field data and is widely used in resource exploration, geological surveys, and environmental monitoring. Its core value lies in breaking through the temporal and spatial limitations of traditional ground magnetic surveys and achieving efficient and large-scale geological information acquisition. In complex terrain areas (such as plateaus, forests, swamps, deserts, etc.), aeromagnetic technology can quickly cover thousands of square kilometers of area, and the efficiency of a single flight is dozens of times higher than that of manual ground measurements. In addition, aeromagnetic data has a strong ability to identify basement structures, fault zones, and magmatic bodies. Especially in the exploration of oil and gas basins, it can indirectly identify oil storage structures through magnetic anomaly characteristics, providing key basis for drilling site selection. With the iteration of technology, the application scenarios of aeromagnetic are constantly expanding, such as being used for seabed topography inversion in marine geological surveys, locating underwater unexploded ordnance in the military field, and detecting underground relics in archaeological research, showing the potential for multidisciplinary cross-integration.

[0003] However, in the process of aeromagnetic measurement, in order to improve the ability to detect shallow targets, UAVs often adopt a terrain-imitating flight mode (flight altitude less than 50 meters). However, ultra-low-altitude flight is sensitive to terrain undulations and can easily cause collision accidents. Although increasing the flight altitude can expand the coverage range, it will cause the magnetic field signal to attenuate, making it difficult to identify shallow weak magnetic targets. Therefore, it has high requirements for aeromagnetic magnetometers. How to improve the sensitivity of aeromagnetic magnetometers has always been a problem that needs to be studied. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to design an aeromagnetic measurement device with high measurement sensitivity.

[0005] Based on this, the present invention proposes the following technical solution: an aeromagnetic measurement device based on NV color center magnetometer, comprising: - Aircraft; -NV color center magnetometer, carried on the aircraft, which includes: A diamond block containing an ensemble NV color center; A laser polarization module, for outputting linearly polarized excitation light, wherein the linearly polarized excitation light is configured to enter the diamond block from the

[120] crystal direction to excite the NV color center to generate photoluminescence, and the polarization direction of the linearly polarized excitation light is switched in sequence between four groups of optimal excitation angles of the NV axis; A microwave module, used for outputting working microwaves to the diamond block; Photoelectric detection module, used to collect photoluminescence and convert it into magnetic field detection data; - Positioning module, used for real-time positioning of the aircraft and obtaining synchronized longitude and latitude data; -Local storage module, used to locally record magnetic field detection data and synchronize longitude and latitude data; -Mobile power supply, used to power the NV color center magnetometer, positioning module and local storage module.

[0006] In a preferred design, the NV color center magnetometer includes a probe optical fiber, the diamond block is arranged on one side end face of the probe optical fiber, and the excitation light output by the laser polarization module enters the diamond block through the probe optical fiber.

[0007] In a preferred design, the probe optical fiber is a single-mode polarization-maintaining optical fiber.

[0008] In a preferred design, the laser polarization module includes a laser and a fiber polarization scrambler, which are connected by another single-mode polarization-maintaining fiber. The fiber polarization scrambler is connected to the diamond block via a probe fiber. The laser is used to output linearly polarized excitation light, and the fiber polarization scrambler is used to adjust the angle of the linearly polarized excitation light.

[0009] The preferred design also includes a power stabilization circuit, which is used to stabilize the laser output power of the laser.

[0010] In a preferred design, the diamond block is a single crystal diamond, which is a rectangular parallelepiped or a cube, with its upper surface perpendicular to the

[001] crystal direction and one side surface perpendicular to the

[120] crystal direction.

[0011] In a preferred design, the photoelectric detection module includes a TIR lens, a filter and a photoelectric detector. The light emitted from the diamond block is collected by the TIR lens, and the collected light is filtered out by the filter to remove the photofluorescence and then collected by the photoelectric detector.

[0012] In a preferred design, the positioning module adopts a GPS positioning module.

[0013] The preferred design also includes: a magnetic compensation system, which is carried on the aircraft and is used to eliminate the magnetic interference of the aircraft operation on the NV color center magnetometer.

[0014] In a preferred design, the outer side of the power motor of the aircraft is coated with an aluminum film.

[0015] The beneficial effects of the nondestructive testing device of the present invention are as follows: The NV magnetometer is based on the nitrogen-vacancy color center quantum effect, and can achieve nT-level high-sensitivity magnetic field detection at room temperature. It does not require the complex temperature control system of the traditional optical pumping magnetometer, has lower power consumption and smaller size, and is suitable for lightweight UAV platforms. Its multi-axis vector measurement capability can directly obtain three-dimensional magnetic field data and improve the target space resolution accuracy. It is also highly resistant to electromagnetic interference and is suitable for complex electromagnetic environments. Its wide-band characteristics support transient field detection, providing high-resolution solutions for resource exploration and military reconnaissance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention. Among them: Figure 1 Module diagram of an aeromagnetic measurement device in an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the composition of the NV color center magnetometer in an embodiment of the present invention.

[0018] Figure 3 This is the four-axial distribution diagram of diamond NV color center.

[0019] Figure 4 This is an example diagram of a traditional technology using polarized light to excite NV color centers.

[0020] Figure 5 is an ODMR spectrum with eight peaks.

[0021] Figure 6 for Figure 2 Enlarged schematic diagram at point A in the middle.

[0022] Figure 7 Schematic diagram of a TIR lens in an embodiment of the present invention.

[0023] Figure 8 This is the crystal orientation distribution of NV color centers in conventional cubic diamond.

[0024] Fig. 9 (a) is a top view of a diamond block with the top surface perpendicular to the

[001] crystal direction.

[0025] Fig. 9 (b) Two longitudinal cutting lines are marked on the top surface of the diamond block along the

[001] crystal direction.

[0026] Fig. 9 (c) Two transverse cutting lines are marked along the vertical crystal direction on the top surface of the diamond block when cutting it once.

[0027] Fig. 9(d) is a top view of the secondary cut diamond block.

[0028] Fig. 9 (e) is a stereoscopic image of the secondary cut diamond block.

[0029] Reference numerals: 1. Diamond block; 2. Laser polarization module; 3. Microwave module; 4. Photoelectric detection module; 5. Probe optical fiber; 21. Laser; 22. Optical fiber polarization scrambler; 23. Single-mode polarization-maintaining optical fiber; 24. Power stabilization circuit; 31. Microwave source; 32. RF transmission line; 33. Antenna; 41. TIR lens; 42. Filter; 43. Photoelectric detector; 411. Light source hole. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0031] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present invention.

[0032] Reference Figure 1 This embodiment provides an aeromagnetic measurement device based on an NV color center magnetometer, including an aircraft, an NV color center magnetometer, a positioning module, a local storage module and a mobile power supply.

[0033] Among them, the aircraft has become the core carrier of complex terrain magnetic field data collection by virtue of its high efficiency and flexibility in aeromagnetic exploration. It can achieve high-resolution detection of shallow weak magnetic targets (such as thin-layer mines) through terrain-simulating flight (altitude <50 meters), which is dozens of times more efficient than traditional methods, and can operate safely in high-risk areas (unexploded ordnance, contaminated waters); In this case, the DJI Jingwei 600M drone is selected as the aircraft. It has strong power, equipped with a 6-axis power system, can carry 6 kg, and has a maximum take-off weight of 15.1 kg. In terms of fuselage structure, the M600 adopts a modular design, which is quick and convenient to assemble and use. The bearing system of the motor core adopts strict sealing treatment to prevent corrosion by rain and dust; the optimized air cooling system can effectively reduce the temperature of the motor; the specially designed protective structure can prevent foreign matter from entering the motor, allowing the aircraft to continue to work in harsh environments. The M600 is equipped with 6 independent smart batteries, and DJI has tailored a battery management system for it. The aircraft can achieve safe landing in the event of a battery failure; the user can switch any battery to act on the entire system without operating one by one.

[0034] In this example, the NV color center magnetometer is mounted on the aircraft, as shown in the attached Figure 2 As shown, it comprises a diamond block 1, a laser polarization module 2, a microwave module 3 and a photoelectric detection module 4, wherein: the diamond block 1 contains an ensemble NV color center, and the atomic pairs composed of the vacancy and nitrogen atom replacing the carbon atom in the nitrogen vacancy color center also have four different orientations, that is, there are four axial directions, as shown in the attached Figure 3 As shown; a laser polarization module 2 is used to output linearly polarized excitation light, and the linearly polarized excitation light is configured to enter the diamond block 1 from the

[120] crystal direction to excite the NV color center to produce photoluminescence, and the polarization direction of the linearly polarized excitation light is switched in sequence between the four groups of optimal excitation angles of the NV axis; a microwave module 3 is used to output working microwaves to the diamond block 1; a photoelectric detection module 4 is used to collect photoluminescence and convert it into magnetic field detection data.

[0035] Regarding the significance and role of the linearly polarized excitation light incident from the

[120] crystal direction in this application, further explanation is given here: the optical transition of the NV color center has a clear dipole radiation characteristic, and its dipole moment direction is fixed along the

[111] crystal direction of diamond. When the electric field polarization direction of the incident light is parallel to the dipole axis of the NV color center, the excitation efficiency is the highest (∝cos 2 θ, θ is the angle between the polarization direction and the dipole axis); when the polarization direction is perpendicular to the dipole axis, the excitation efficiency approaches zero. Based on this principle, by optimizing the polarization direction to be parallel to the dipole axis, the fluorescence difference of different spin states can be amplified (such as the ODMR signal contrast is increased to ~30%), thereby enhancing the sensitivity of spin state detection and thus improving the sensitivity of the magnetometer.

[0036] Conventionally, the polarization direction can be completely parallel to a single NV axis. The magnetometer constructed in this way can obtain excellent measurement sensitivity in the process of non-vector magnetic field measurement. However, in aeromagnetic measurement, vector magnetic field is indispensable. In order to improve the measurement sensitivity as much as possible, it is necessary to improve the measurement accuracy of magnetic field components in all four NV axes. In traditional technologies, such as the attached Figure 4 As shown, multiple groups of polarizing lenses are distributed around the diamond to achieve parallel or nearly parallel polarization directions with the axes of each NV. However, this structure is scattered and complex and is suitable for use in laboratories. In the actual detection process, based on the requirements of stable measurement and simple structure, the applicant uses a single optical fiber-diamond combined quantum probe for detection.

[0037] For a single fiber-diamond combined quantum probe, the propagation direction of the laser in the fiber is fixed and unique. It is very necessary to achieve the optimal measurement of the laser polarization direction and the four NV axes in sequence by adjusting this single laser propagation direction (orthogonal to the polarization direction).

[0038] To achieve the above purpose, in this application, the linearly polarized excitation light is incident on the diamond from the

[120] crystal direction. Through derivation and calculation, we know that when the linearly polarized light is incident from the

[120] crystal direction, the minimum angle θ between the linearly polarized light and the axes of the four NV color centers is adjusted as follows: For NV1 [1,1,1] and NV4 [-1,-1,1]: the minimum angle θ≈51°; For NV2 [1,-1,-1] and NV3 [-1,1,-1]: the minimum angle θ≈15°.

[0039] In this application, the optimal excitation angles of the four groups of NV axes mentioned above refer to the concept of the minimum angle, but based on the inaccuracy of actual operation and observation, we allow the optimal excitation angle to be close to the minimum angle. In a broader concept, the optimal excitation angle is something we can set based on actual needs. Before testing, we traverse the polarization direction under a known magnetic field to find the optimal excitation angle.

[0040] As mentioned earlier, when measuring, it is necessary to switch between the optimal excitation angles in sequence. Here is a specific explanation. In this application, there are four optimal polarization directions corresponding to the optimal excitation angle. When measuring vectors, four-axis measurement data at the same position is required, so it is necessary to switch the optimal polarization directions one by one in a short time, and the interval time is about 100μs.

[0041] Under this propagation angle design of linearly polarized excitation light, although the polarization direction is not completely parallel to the NV axis, we believe that it also has sufficient measurement sensitivity after comprehensive consideration. When performing aeromagnetic vector measurement, we periodically switch the optimal polarization direction (the polarization direction when the minimum angle θ with the NV axis is reached) to measure the most accurate results of the magnetic field components of the vector magnetic field in the four NV axes respectively. Finally, accurate vector magnetic field information is obtained through calculation of the magnetic field component data in the four axes. For ease of understanding, an analysis of the detection principle is made here. After selecting an optimal polarization direction, theoretically, we can get a value as shown in the attached figure. Figure 5 The ODMR spectrum shown only considers the four peaks on the left, which respectively reflect the magnetic field component information of the four axes NV1-NV4. If we choose to adjust the polarization for the first time to maximize the excitation of the measurement performance of the NV1 axis, the corresponding peak on the obtained ODMR spectrum will more accurately reflect the size of the magnetic field component. At this time, we extract and save the magnetic field component information corresponding to the fourth peak on the left, and then switch the polarization direction to maximize the excitation of the other three axes in turn and perform magnetic field measurements, and extract and save the corresponding magnetic field component information. Finally, we will use these four accurate magnetic field component information to deduce the accurate vector magnetic field information.

[0042] In a specific example, as shown in the attached Figure 2 As shown, the NV color center magnetometer includes a probe optical fiber 5, the diamond block 1 is arranged on one side end face of the probe optical fiber 5, the excitation light output by the laser polarization module 2 enters the diamond block 1 through the probe optical fiber 5, wherein the probe optical fiber is preferably a single-mode polarization-maintaining optical fiber; the laser polarization module includes a laser 21 and an optical fiber polarization scrambler 22, the two are connected by another single-mode polarization-maintaining optical fiber 23, the optical fiber polarization scrambler 22 is connected to the diamond block 1 through the probe optical fiber 5, the laser 21 is used to output linearly polarized excitation light, and the optical fiber polarization scrambler The device 22 is used to adjust the angle of the linearly polarized excitation light, and more preferably, it also includes a power stabilization circuit 24, which is used to stabilize the laser output power of the laser 21; in this example, the microwave module 3 includes a microwave source 31, a radio frequency transmission line 32 and an antenna 33 (preferably a microstrip antenna), the antenna 33 is located near the diamond block 1, and the microwave signal output by the microwave source 31 is transmitted to the antenna 33 through the radio frequency transmission line 32, and radiated to the diamond block 1 through the antenna 33; wherein the photoelectric detection module 4 is a photoelectric detector (such as a photodiode) arranged near the diamond block 1.

[0043] Before the above-mentioned NV color center magnetometer works, it is necessary to traverse the polarization direction under a known magnetic field to find the optimal polarization direction. The optical fiber polarization scrambler 22 obtains different phase delays of polarization components in orthogonal directions by changing the voltages of multiple independent ferroelectric liquid crystal phase retarders, thereby changing the polarization state of light and obtaining any polarization state and polarization state traversal. The switching time between different polarization states is less than 100μs. We determine the optimal polarization direction by observing the fluorescence signal measurement spectrum and record the polarization scrambler parameters at the corresponding position.

[0044] During aeromagnetic measurement, the linearly polarized excitation light output by the laser 21 enters the fiber scrambler 22 through the single-mode polarization-maintaining fiber 23, and then connects to the probe fiber 5 to finally enter the diamond block 1 from the

[120] crystal direction. During this process, the fiber scrambler 22 realizes the measurement process in four different optimal polarization directions through parameter switching, and obtains and saves four sets of magnetic field component information. Finally, these data are bound with the position information and sent to the host. The host calculates the vector magnetic field information by setting the system, and binds it with the position information for the second time to complete the aeromagnetic measurement.

[0045] In a further design, in order to improve the efficiency of fluorescence collection, Figure 6 and Figure 7 As shown, the photoelectric detection module 4 includes a TIR lens 41, a filter 42 and a photodetector 43. The light emitted from the diamond block 1 is collected through the TIR lens 41 (the bottom of the TIR lens 41 includes a light source hole 411, and the diamond block 1 is placed in the light source hole 411). The collected light is filtered out by the filter 42 to remove the photofluorescence and then collected by the photodetector 43. This design can significantly improve the collection rate of the fluorescence signal.

[0046] In the above design, we require that the propagation direction of the excitation light be configured to be incident into the diamond block 1 from the

[120] crystal direction. Conventional diamond blocks containing NV color centers are usually rectangular or cube-shaped, and generally none of their sides are perpendicular to the

[120] crystal direction. Figure 8 As shown, the direction perpendicular to the side surface is generally

[100] crystal direction,

[010] crystal direction or

[001] crystal direction. Obviously, in this case, it is difficult to connect the optical fiber to the diamond block 1 with the

[120] crystal direction. In order to solve this problem, this example also proposes a diamond structure. Specifically, the diamond block 1 is a single crystal diamond, which is a rectangular parallelepiped or a cube, with its upper surface perpendicular to the

[001] crystal direction and one side perpendicular to the

[120] crystal direction. The steps for preparing this diamond structure are exemplarily as follows. Fig. 9 As shown: 1. Prepare a diamond block containing NV color centers, and use an X-ray diffractometer to determine the

[001] and

[120] crystal directions of the diamond crystal, such as Fig. 9As shown in (a), its top surface is perpendicular to the crystal direction

[001] , and the crystal direction

[120] drawn from the top surface perspective is shown by the arrow in the figure; 2. Use laser to carve reference lines on the diamond surface to indicate the longitudinal cutting direction, as shown in the attached Fig. 9 (b) As shown by the upper dotted line, laser cutting is completed according to the dotted line; 3. Continue to mark the horizontal cutting direction, as shown in the attached Fig. 9 (c) As shown by the upper dotted line, laser cutting is completed according to the dotted line; 4. Finally, a rectangular diamond block is obtained, the upper surface of which is perpendicular to the

[001] crystal direction and one side surface is perpendicular to the

[120] crystal direction, as shown in the attached figure. Fig. 9 (d) and 9(e). ‌ After the diamond block 1 is prepared by the above method, its side is aligned with the end face of the single-mode optical fiber and fixed with optical glue.

[0047] In this example, the positioning module is used for real-time positioning of the aircraft to obtain synchronized longitude and latitude data. In a specific example, a GPS positioning module, model ATK-1218-BD, can be used. The NV color center magnetometer and the GPS positioning module can realize software synchronization, and the magnetic field data and GPS longitude and latitude data can be stored in the local storage module.

[0048] In this example, the local storage module is used to locally record magnetic field detection data and synchronize longitude and latitude data, and can be connected to a PC host computer for corresponding data processing; in a specific example, the local storage module can use an STM32F407ZGT6 main control board, which can expand the GPS positioning module and other functional modules to achieve communication with the NV color center magnetometer sensor, and synchronize the NV color center magnetometer data with the GPS data through software to achieve local storage, while supporting data processing and communication with the host computer.

[0049] In this example, the mobile power supply is used to power the NV color center magnetometer, the positioning module, and the local storage module.

[0050] Considering that the quality of data collected by aeromagnetic measurement depends largely on the effect of compensation, the target magnetic anomaly signal decays with the cube or the fourth power of the distance. In the absence of good compensation, the signal of the detected target can be easily completely covered by the interference of the magnetic field of the nearby aircraft. Therefore, the preferred design also includes: a magnetic compensation system, which is carried on the aircraft to eliminate the magnetic interference of the aircraft operation on the NV color center magnetometer; in a specific example, the AARC51 data collection system and adaptive real-time compensator of RMS Instruments can provide the aircraft with real-time compensation for the magnetic interference of the airborne system, so that the high resolution of the high-sensitivity magnetometer can be effectively utilized, and the compensation solves the influence of permanent magnets, electromagnetic induction magnetism and eddy currents, and also eliminates the steering error of the sensor. If there is no such system, the power motor interference is overcome in two ways: one is that the diamond quantum magnetometer probe is hard-connected and suspended to maintain a certain distance from the fuselage, and the other is to consider wrapping the power motor with aluminum film to reduce the interference of the eddy current field generated during the flight.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An aeromagnetic measurement device based on NV color center magnetometer, characterized in that: include: - Aircraft; -NV color center magnetometer, carried on the aircraft, which includes: A diamond block containing an ensemble NV color center; A laser polarization module, for outputting linearly polarized excitation light, wherein the linearly polarized excitation light is configured to enter the diamond block from the [120] crystal direction to excite the NV color center to generate photoluminescence, and the polarization direction of the linearly polarized excitation light is switched in sequence between four groups of optimal excitation angles of the NV axis; A microwave module, used for outputting working microwaves to the diamond block; Photoelectric detection module, used to collect photoluminescence and convert it into magnetic field detection data; - Positioning module, used for real-time positioning of the aircraft and obtaining synchronized longitude and latitude data; -Local storage module, used to locally record magnetic field detection data and synchronize longitude and latitude data; -Mobile power supply, used to power the NV color center magnetometer, positioning module and local storage module.

2. The aeromagnetic measurement device according to claim 1, characterized in that: The NV color center magnetometer comprises a probe optical fiber, the diamond block is arranged on one side end face of the probe optical fiber, and the linearly polarized excitation light output by the laser polarization module enters the diamond block through the probe optical fiber.

3. The aeromagnetic measurement device according to claim 2, characterized in that: The probe optical fiber is a single-mode polarization-maintaining optical fiber.

4. The aeromagnetic measurement device according to claim 3, characterized in that: The laser polarization module includes a laser and an optical fiber polarization scrambler, which are connected by another single-mode polarization-maintaining optical fiber. The optical fiber polarization scrambler is connected to a diamond block via a probe optical fiber. The laser is used to output linearly polarized excitation light, and the optical fiber polarization scrambler is used to adjust the angle of the linearly polarized excitation light.

5. The aeromagnetic measurement device according to claim 4, characterized in that: A power stabilization circuit is also included, which is used to stabilize the laser output power of the laser.

6. The aeromagnetic measurement device according to claim 4, characterized in that: The diamond block is a single crystal diamond, which is a rectangular parallelepiped or a cube, with its upper surface perpendicular to the [001] crystal direction and one side surface perpendicular to the [120] crystal direction.

7. The aeromagnetic measurement device according to claim 1, characterized in that: The photoelectric detection module comprises a TIR lens, a filter and a photoelectric detector. The light emitted from the diamond block is collected by the TIR lens. The collected light is filtered out of the photofluorescence by the filter and then collected by the photoelectric detector.

8. The aeromagnetic measurement device according to claim 1, characterized in that: The positioning module adopts a GPS positioning module.

9. The aeromagnetic measurement device according to claim 1, characterized in that: It also includes: a magnetic compensation system, which is carried on the aircraft and is used to eliminate the magnetic interference of the aircraft operation on the NV color center magnetometer.

10. The aeromagnetic measurement device according to claim 1, characterized in that: The outside of the aircraft's power motor is covered with aluminum film.

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