Test bench and quantum detection equipment

Abstract

The present invention relates to the field of quantum precision measurement technology. The scheme is a detection platform and a quantum detection device for detecting a microwave field generated by a microwave radiation device, wherein the detection platform comprises a platform, a bracket, a probe seat, an optical fiber probe, a bias magnetic source, a magnetic source seat, an electric translation stage and a stage; the scheme utilizes the correspondence between a diamond NV color center and a microwave-light-magnetic field to design a quantum detection device capable of measuring an external microwave field, and the quantum detection device can realize accurate measurement of a microwave field based on the quantum precision measurement technology; by setting a bias magnetic source, the energy level splitting degree of the diamond NV color center can be adjusted, thereby changing its resonance frequency, so that the measurable frequency range of the diamond NV color center is expanded, thereby improving the applicability of the device.

Description

Technical Field

[0001] The invention relates to the technical field of quantum precision measurement, and in particular to a detection platform and quantum detection equipment. Background Art

[0002] In recent years, the research on solid-state spin color center systems in the field of quantum precision has developed rapidly, and a detection method based on optical detection magnetic resonance (ODMR) has been developed. By studying the linear relationship between the microwave magnetic resonance frequency and the external magnetic field, the sensing measurement and quantification of the external magnetic field can be realized; in the solid-state quantum system, the diamond nitrogen-vacancy color center (NV color center) is the most representative system. The NV color center is a point defect in diamond, and the fluorescence emission is very stable.

[0003] This scheme is based on the principle of optical detection magnetic resonance. Considering the correspondence between microwaves, light, and magnetic fields and diamond NV color centers, it is intended to propose a new type of quantum device and its structure that can measure microwave fields. By utilizing the high sensitivity characteristics of diamond NV color centers, high-precision measurement of microwave fields can be achieved. This research result has a wide range of application scenarios and can be used for antenna radiation structure detection, microwave electromagnetic interference detection, etc. Summary of the invention

[0004] The present invention proposes a detection platform and a quantum detection device, which realize accurate measurement of microwave fields through the high sensitivity and high precision characteristics of diamond NV color centers.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A detection platform for detecting a microwave field generated by a microwave radiation device, comprising:

[0007] platform;

[0008] A bracket, arranged on the top of the platform;

[0009] A probe seat, arranged on the bracket;

[0010] An optical fiber probe is mounted on the probe seat, and its structure comprises a first optical fiber and a diamond particle arranged on one end face thereof, wherein the diamond particle contains an NV color center, and the other side of the first optical fiber is used for inputting excitation light and outputting photoluminescence;

[0011] A bias magnetic source, used to apply a bias magnetic field to the diamond grains, wherein when in operation, the bias magnetic field is configured to enable the NV color center to be acted upon by the microwave field to be measured and generate a spin flip;

[0012] A magnetic source seat, which is used to install the bias magnetic source and is configured to adjust the distance between the bias magnetic source and the diamond particles;

[0013] An electric translation stage, disposed on the platform, configured to achieve XYZ three-axis movement of the load;

[0014] The loading platform is arranged on the electric translation platform and is used for placing the microwave radiation device to be tested.

[0015] In the detection station as described above, in some embodiments of the present application, the probe seat comprises:

[0016] A manual screw-in translation stage, which is configured to achieve XYZ three-axis load movement;

[0017] An adapter plate, used for fixing the manual screw-in displacement stage to the bracket;

[0018] A universal cantilever, one end of which is connected to a triaxially displaceable connection portion on the manual screw-in displacement platform;

[0019] The probe clamp is used to clamp the optical fiber probe, which is connected to the other end of the universal cantilever and can be adjusted in any direction through the universal cantilever.

[0020] In some embodiments of the detection platform as described above, the electric translation platform comprises:

[0021] An XY axial electric displacement assembly, which is fixed to the surface of the platform and is configured to achieve XY biaxial load displacement through electric drive;

[0022] The Z-axis manual displacement assembly is fixed to the top of the XY-axis electric displacement assembly and is configured to achieve Z-axis load movement by manual screwing.

[0023] In some embodiments of the detection platform as described above, the bias magnetic source is a permanent magnet; the magnetic source base is a universal arm, which is installed on the bracket or the platform.

[0024] In the detection platform as described above, in some embodiments, the bias magnetic source is a plurality of annular permanent magnets; the magnetic source seat comprises a cylinder and an inner tube, the inner tube is fixed on the probe seat, the inner tube can be connected to the central through hole of the cylinder by a thread, and the central through hole of the inner tube is used to fix the side of the optical fiber probe close to the diamond particles; a plurality of the annular permanent magnets are stacked and sleeved on the outside of the cylinder.

[0025] The inspection platform as described above, in some embodiments, further comprises an industrial camera, and the industrial camera is mounted on the bracket or the platform via a camera mount.

[0026] Another aspect of the present application further provides a quantum detection device, which uses any of the detection platforms described above, and further includes a control cabinet and a host computer electrically connected thereto, wherein the control cabinet includes:

[0027] A laser output module, used for outputting excitation light, wherein the excitation light is configured to be coupled into the first optical fiber for transmission and irradiate the diamond grains to generate photoluminescence;

[0028] A fluorescence collection module, used for collecting the photoinduced fluorescence and forming a detection signal;

[0029] Functional integration module for detection signal preprocessing and drive signal control;

[0030] The host computer is used for human-computer interaction, data processing and visualization imaging, and drive signal input / output.

[0031] The quantum detection device as described above, in some embodiments, further comprises a microwave module electrically connected to the host machine, wherein the microwave module is configured to provide a microwave signal to the microwave radiation device to be tested.

[0032] The quantum detection device as described above, in some embodiments, further comprises an industrial camera electrically connected to the host computer, and the industrial camera is mounted on the bracket or the platform via a camera mount.

[0033] In some embodiments of the quantum detection device as described above, the host computer includes a scanning interval automatic positioning module, which is configured to automatically plan a scanning interval of the object to be tested based on the shooting image of the object to be tested by the industrial camera, and the host computer sends a driving signal according to the planned scanning interval to control the movement of the electric translation stage.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This scheme uses the correspondence between diamond NV color centers and microwave-light-magnetic field to design a quantum detection device that can measure external microwave fields. Based on quantum precision measurement technology, it can achieve accurate measurement of microwave fields. By setting a bias magnetic source, the degree of energy level splitting of the diamond NV color center can be adjusted, thereby changing its resonant frequency, thereby expanding the measurable frequency range of the diamond NV color center and improving the applicability of the device.

[0036] This solution is equipped with a machine learning algorithm that can complete one-click scanning. The object to be measured is placed on the stage, and the host computer can determine the size and specifications of the object to be measured, plan the scanning path, and automatically complete the scanning without manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 It is a three-dimensional schematic diagram of the detection platform in Example 1;

[0039] Figure 2 is a three-dimensional schematic diagram of the probe seat in Example 1;

[0040] Figure 3 ODMR spectra under zero magnetic field and 1.19mT magnetic field;

[0041] Figure 4 A schematic diagram of the structure of the bias magnetic source in the first embodiment;

[0042] Figure 5 is a three-dimensional schematic diagram of the electric translation stage in the first embodiment;

[0043] Figure 6 A three-dimensional schematic diagram of a detection platform including an industrial camera in Example 1;

[0044] Figure 7 is a three-dimensional schematic diagram of a detection station containing two groups of optical fiber probes in Example 1;

[0045] Figure 8 This is a system block diagram of the quantum detection device in Example 2. DETAILED DESCRIPTION

[0046] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0047] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, one or more embodiments are now described with reference to the accompanying drawings, wherein similar reference numerals throughout the text are used to refer to similar components. In the following description, for the purpose of explanation, many specific details are set forth in order to provide a more thorough understanding of one or more embodiments. However, it is clear that in various cases, one or more embodiments can be practiced without these specific details, and the various embodiments can be combined and referenced to each other without contradiction.

[0048] <Example 1>

[0049] See attached Figure 1This embodiment introduces a detection platform for detecting the microwave field generated by a microwave radiation device, including a platform 1, a bracket 2, a probe seat 3, an optical fiber probe 4, a bias magnetic source 5, a magnetic source seat 6, an electric displacement platform 7 and a stage 8.

[0050] In this example, the platform 1 is used as the base of the test bench, and threaded holes are distributed on its surface for fixing and installing equipment components.

[0051] In this example, the bracket 2 is arranged at the top of the platform 1. For a specific structural example, see the attached Figure 1 As shown, it includes a mounting plate and a support rod for supporting the mounting plate; the number of the brackets 2 can be set to one or more as needed.

[0052] In this example, the probe seat 3 is arranged on the bracket 2, which is used to install the optical fiber probe 4. In a preferred structure, see the attached Figure 2 As shown, the probe seat includes a manual screw-in displacement stage 31, an adapter plate 32, a universal cantilever 33 and a probe fixture 34: wherein the manual screw-in displacement stage 31 can realize XYZ three-axis load movement, and its actual types are various. In principle, any displacement structure based on manual screw-in operation can be used, and a device that can achieve micron-level displacement accuracy is preferred; the adapter plate 32 is used to fix the manual screw-in displacement stage 31 to the bracket 1, and a flat plate with holes can be used; one end of the universal cantilever 33 is connected to the three-axial displacement connection part on the manual screw-in displacement stage 31; the probe fixture 34 is used to clamp the optical fiber probe 4, which is connected to the other end of the universal cantilever 33. Any orientation adjustment can be achieved through the universal cantilever 33. It should be known that the structural design of each component in the accompanying drawings is only one of the options. In fact, various types of conventional devices with the same principle and their simple combinations can be replaced by various components in the preferred structure.

[0053] In this example, the optical fiber probe 4 is mounted on the probe holder 3, and its structure includes a first optical fiber 41 and diamond particles 42 arranged on one end surface thereof (see the attached Figure 2 In the structure, the diamond grains 42 contain NV color centers, and the other side of the first optical fiber 41 is used to input excitation light and output photoluminescence. Specifically, for the NV color center, red photoluminescence will be generated when irradiated with a 532nm laser.

[0054] In this example, the bias magnetic source 5 is used to apply a bias magnetic field to the diamond grain 42. When working, the bias magnetic field is configured to enable the NV color center to be acted upon by the microwave field to be measured and produce a spin flip. The magnetic source seat 6 is used to install the bias magnetic source 5, which is configured to adjust the distance between the bias magnetic source 5 and the diamond grain 42. Regarding the NV color center, the use of laser irradiation to the NV color center will produce red fluorescence, and its ground state exists m s =0 state and m s = ±1 state, based on its quantum properties, ms = ±1 state and m s =0 state, the red fluorescence intensity will be weaker, and the microwave signal with a frequency of 2.87 GHz will make m s =0 state to m s = ±1 state transition (i.e., spin flip), that is, when a microwave field with a frequency of 2.87 GHz is applied externally, the red fluorescence will become significantly weaker, see Appendix Figure 3 The spectrum line on the upper side shows that the diamond NV color center will produce a resonant absorption peak at a microwave frequency of 2.87 GHz, and the change in microwave power is also related to the red fluorescence intensity. Therefore, in fact, we can use the diamond NV color center to sense the external microwave field with a frequency of about 2.87 GHz. By sensing the fluorescence change, we can determine whether there is a microwave field of the corresponding frequency in the outside world, or sense the power change of the microwave field (such as determining whether the antenna radiates microwaves evenly, or finding the best microwave radiation area). But in fact, in many detection scenarios, the frequency of the microwave field is not around 2.87 GHz, so it is very necessary to improve the microwave frequency detection range of the detection system. Based on this problem, we combined the characteristics of the NV color center, that is, when an external magnetic field is applied, its ground state m s = ±1 state will undergo Zeeman splitting, which is divided into m s =+1 state and m s = -1 state, at this time the microwave resonance frequency of the diamond NV color center will change. s =+1 state and m s =-1 state will have a microwave resonance frequency, and the two are symmetrical about the frequency 2.87GHz, which is shown in the ODMR spectrum as shown in the following Figure 3 As shown in the spectrum lines on the upper and lower sides, two resonant absorption peaks are generated, and the experiment found that the stronger the external magnetic field, the farther the center distance of the two resonant absorption peaks. In other words, the microwave frequency that can be sensed by the diamond NV color center has changed. Therefore, we designed a bias magnetic source 5 in the scheme, which applies external magnetic fields of different sizes to the diamond NV color center, changes the microwave frequency range that the detection system can perceive, and improves the applicability of the system.

[0055] Regarding the bias magnetic source 5, in some embodiments, as shown in the attached Figure 1 As shown in the figure, it is a block permanent magnet. Regarding the block permanent magnet, it is mainly distinguished from the stacked annular permanent magnet structure mentioned below. Its actual structure is diverse, and it can be a permanent magnet in the shape of a long / cube, cylinder, ring, etc. In this embodiment, the magnetic source seat 6 is a universal arm, which is installed on the bracket 2 or the platform 1.

[0056] Considering that the bias magnetic field provided by the aforementioned block permanent magnet structure is relatively weak, the variable microwave frequency detection range is still not large enough, in some preferred embodiments, the attached Figure 4As shown, the bias magnetic source 5 is a plurality of annular permanent magnets 51; the magnetic source seat 6 comprises a cylinder 61 (preferably an I-shaped) and an inner tube 62, the inner tube 62 is fixed on the probe seat 3, the inner tube 62 can be connected to the central through hole of the cylinder 61 by a thread, and the central through hole of the inner tube 62 is used to fix the side of the optical fiber probe 4 close to the diamond grains 42; a plurality of annular permanent magnets 51 are stacked and sleeved on the outside of the cylinder 61, and when in use, the distance between the annular permanent magnets 51 and the diamond grains 42 can be adjusted by rotating the cylinder 61, thereby adjusting the bias magnetic field strength and increasing the microwave frequency sensing range; in addition, when using a block permanent magnet placed on the side as a bias magnetic source, due to the irregularity of its magnetic field direction, when the permanent magnet is moved, the signal-to-noise ratio of the detection signal may be reduced, and in the aforementioned preferred structural design, no matter how the magnetic ring moves, the diamond is always located on the central axis of the magnetic ring, and at this position, the bias magnetic field direction is uniform and stable, which can ensure the signal-to-noise ratio of the detection signal.

[0057] In some other design schemes, the bias magnetic source can also be an energized coil, which is arranged around the diamond. The periphery here includes the position design of the aforementioned permanent magnet and the position design of the magnetic ring structure.

[0058] Taking into account that in actual detection, the frequency of the external microwave field is often unknown (mainly some detection scenarios do not require knowing the frequency information to achieve detection, such as for microwave interference detection, there is no need to detect the specific microwave frequency. For radiating devices such as microwave antennas, it is only necessary to perceive the microwave power changes caused by design defects), but knowing the microwave frequency can better help analyze the data. In order to obtain this function, in some exemplary scheme designs, combined with the design of the bias magnetic source being an energized coil, the energized coil can be electrically connected to the data processing module, and the data processing module includes an electric-microwave frequency conversion database (the database can be completed in the laboratory, by changing the current in the energized coil, measuring the microwave field of known frequency, and when the measured photoluminescence is the weakest, the current is marked with the microwave of that frequency. By changing the microwave field frequency, the current in the energized coil that can be used for perception corresponding to each microwave frequency is obtained, and the data can be summarized to construct an electric-microwave frequency conversion database). In actual detection, according to the electric-microwave frequency conversion database, the frequency of the microwave field to be measured can be inferred according to the working voltage of the energized coil.

[0059] In this example, the electric translation stage 7 is arranged on the platform 1, which can realize the movement of the load in the three axes of XYZ; in a preferred structural design, as shown in the attached Figure 5As shown, the electric translation stage includes an XY-axis electric translation component 71 and a Z-axis manual translation component 72; wherein, the XY-axis electric translation component 71 is fixed to the surface of the platform 1, and can realize XY biaxial load displacement by electric drive; the Z-axis manual translation component 72 is fixed to the top of the XY-axis electric translation component 71, and can realize Z-axis load movement by manual screwing; it should be known that the structural design of each component in the accompanying drawings is only one of the options. In fact, various types of conventional devices with the same principle and their simple combinations can be replaced by various components in the preferred structure; when in use, the XY-axis electric translation component 71 can be controlled by an external driving signal to realize planar movement, thereby realizing the relative displacement of the object to be tested and the optical fiber probe 4 on a plane. Through the Z-axis manual translation component 72, the height difference between the optical fiber probe 4 and the object to be tested can be quickly adjusted. Although the probe seat 3 can also realize Z-axis displacement, it is different from its micron-level precision adjustment. In this example, the Z-axis manual translation component 72 does not need to realize micron-level precision adjustment, and its displacement adjustment speed is relatively faster, saving the calibration time before detection.

[0060] In this example, the stage 8 is disposed on the electric translation stage 7 and is used to place the microwave radiation device to be tested. Preferably, the stage 8 is made of non-metallic material, such as glass material, which can effectively shield the influence of the electrical equipment on the test.

[0061] As above detection platform, in some embodiments, as attached Figure 6 As shown, it also includes an industrial camera 10, which is installed on the bracket 2 or the platform 1 through a camera holder 9; the distance between the optical fiber probe 4 and the object to be measured can be accurately adjusted through the industrial camera 10; in addition, in some example schemes, a machine learning algorithm is equipped in the external host computer, which can complete one-key scanning, place the object to be measured on the stage 8, and the host computer can determine the size of the object to be measured, plan the scanning path, and automatically complete the scanning without manual operation. Because the resolution involved in this scheme is mostly at the micron level, if it is manually adjusted and the path is manually planned, it will cause too large an error.

[0062] As in the above detection platform, in some embodiments, in order to enrich the detection needs, multiple optical fiber probes 4 can also be used for detection, see the attached Figure 7 In the example, two optical fiber probes 4 are included and two brackets 2 are provided. The optical fiber probes 4 are installed on the brackets 2 on both sides through probe seats, one on the left and one on the right.

[0063] <Example 2>

[0064] See attached Figure 8This embodiment also provides a quantum detection device, which applies the above-mentioned detection and further includes a control cabinet and a host computer electrically connected thereto. The control cabinet includes a laser output module, a fluorescence collection module and a function integration module.

[0065] In this example, the laser output module is used to output excitation light, and the excitation light is configured to be coupled into the first optical fiber 41 for transmission and irradiation of the diamond grains 42 to produce photoluminescence; for the diamond NV color center, the wavelength of the excitation light is generally 532nm, and under this laser irradiation, the diamond NV color center will produce red photoluminescence; an exemplary optical path configuration scheme is that after the excitation light is output from the light source, it can enter the first optical fiber 41 through an optical modulator, an optical fiber coupler, etc.

[0066] In this example, the fluorescence collection module is used to collect photofluorescence and form a detection signal; as some preferred designs, the fluorescence detection module includes a photodiode (such as an avalanche diode) and a filtering structure (filter), and the photofluorescence directed to the photodiode needs to be filtered out by the filtering structure in advance to remove stray light.

[0067] In this example, the functional integration module is used for detection signal preprocessing and drive signal control; for example, detection signal preprocessing includes demodulation, noise reduction and other operations on the signal after photofluorescence collection, so that the final detection signal is adapted to the data processing program in the host computer, and drive signal control refers to receiving and processing the electric translation stage drive signal transmitted by the host computer, so that the electric translation stage works according to instructions.

[0068] In this example, the host computer is used for human-computer interaction, data processing and visualization, and drive signal input / output; in some specific designs, the host computer has stored inside it program methods for microwave field analysis based on detection signals, functional modules for ODMR spectrum line drawing, and control programs that can be used to control the operation of the electric translation stage.

[0069] In some testing scenarios, such as performance testing of microwave radiation structures (such as antennas, microstrip antennas), they often cannot autonomously generate microwave fields for testing. To solve this problem, as a preferred design, it also includes a microwave module electrically connected to the host machine, and the microwave module is used to provide microwave signals to the microwave radiation device to be tested.

[0070] In some other design schemes, an industrial camera electrically connected to a host computer is also included, and the industrial camera is installed on a bracket or platform through a camera mount; further, the host computer includes a scanning interval automatic positioning module, which is configured to automatically plan a scanning interval of the object to be tested according to the shooting image of the object to be tested by the industrial camera, and the host computer sends a driving signal to control the movement of the electric translation stage according to the planned scanning interval. The scanning interval automatic positioning module can complete one-click scanning, and the object to be tested is placed on the stage. The host computer can determine the size and specifications of the object to be tested, plan the scanning path, and automatically complete the scanning without manual operation.

[0071] In a specific example, the interval planning principle of the automatic positioning module of the scanning interval can be: use a machine vision algorithm that combines the maximum inter-class variance method (Otsu) with the improved Linemod-2D algorithm to identify and locate the object to be measured, and use the similar triangle algorithm to complete the length and width measurement of the object to be measured and plan the scanning interval. Otsu is an algorithm for determining the threshold for image binarization segmentation. In layman's terms, it separates the target from the background. It divides the image into two parts, background and foreground, according to the grayscale characteristics of the image. Variance is a measure of the uniformity of grayscale distribution. The larger the variance of the background and foreground, the greater the difference between the two, and the greater the difference between the target and the background of the image. The Linemod-2D algorithm is a 2D graphic matching algorithm. Since the sides of the objects to be measured in this scheme are mostly rectangular, computer processing is used to complete the shape measurement and length and width calculation of the objects to be measured. According to the length and width calculation, the scanning interval is planned. The specific process is as follows:

[0072] S1. The object to be measured is fixed on the stage;

[0073] S2, computer-assisted industrial camera, completes the segmentation of the object to be tested and the background in the image of the object to be tested;

[0074] S3, then use the graphic matching algorithm to complete the shape and length and width calculation of the object to be measured;

[0075] S4. Plan the scanning interval and wait for the measurement to start.

[0076] When the above system is working, taking the detection antenna as an example, it is described in combination with the above-mentioned detection platform structure. The antenna to be tested is placed on the top surface of the stage 8, and the probe seat 3 is adjusted so that the bottom end of the optical fiber probe 4 is located near the top of the antenna. The antenna is connected to an external microwave module to generate a microwave field of a specific frequency. The position of the bias magnetic source 5 is adjusted until the attenuation change of the photoluminescence signal appears on the display screen of the host computer, indicating that the system can now detect the microwave field of this frequency. At this time, the position of the bias magnetic source 5 is fixed and does not move. The upper computer sends a command to control the movement of the electric translation stage 7 so that the optical fiber probe 4 covers the area where the detection antenna is located, and obtains the detection signal of the area where the antenna is located (due to design defects of the antenna, the microwave field power at some positions will be different, which will affect the intensity of the photoluminescence, and the antenna performance can be judged based on this).

[0077] <Example 3>

[0078] This embodiment also discloses a detection method, which uses the quantum detection device as described above, including:

[0079] S1: adjusting the relative position of the optical fiber probe 4 and the external microwave radiation device so that the diamond grains 42 are located in the effective detection area;

[0080] In a specific example, such as detecting a microwave antenna, in order to obtain a more accurate detection effect, the front end diamond grain 42 of the quantum probe is as close to the antenna as possible.

[0081] S2: Start the quantum detection device, adjust the bias magnetic source 5 and observe the fluorescence signal. When the fluorescence signal shows the expected change, stop adjusting the bias magnetic source 5 and maintain it in the current state, and then start the formal detection.

[0082] Specifically, this system operates based on the ODMR method. When the bias magnetic field is of appropriate size, it means that the microwave field of the current frequency can cause the NV color center to produce a spin flip. At this time, the photoluminescence intensity generated by the diamond NV color center will decay (expected change). The change in photoluminescence found by the host computer can be used to determine whether the position of the bias magnetic source 5 is appropriate.

[0083] Combined with the ODMR spectrum, it can be seen that microwaves near a center frequency can cause the NV color center to produce a spin flip, but the microwave field at the center frequency can maximize the spin flip, that is, the photoluminescence attenuation at this time is the strongest, and detection under microwaves of this frequency has a better response sensitivity. Therefore, in some preferred methods, when adjusting the bias magnetic source 5, the change of the fluorescence signal is observed. When the fluorescence signal changes continuously, the adjustment process is stopped at the point where the change amplitude is the largest. At this time, the frequency of the external microwave field can maximize the spin flip of the NV color center, and the responsiveness of the fluorescence signal is optimal.

[0084] 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.

[0085] 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. A test bench for detecting a microwave field to be tested generated by a microwave radiation device, characterized in that: include: platform; A bracket, arranged on the top of the platform; A probe seat, arranged on the bracket; An optical fiber probe is mounted on the probe seat, and its structure comprises a first optical fiber and a diamond particle arranged on one end face thereof, wherein the diamond particle contains an NV color center, and the other side of the first optical fiber is used for inputting excitation light and outputting photoluminescence; A bias magnetic source, used to apply a bias magnetic field to the diamond grains, wherein when in operation, the bias magnetic field is configured to enable the NV color center to be acted upon by the microwave field to be measured and generate a spin flip; A magnetic source seat, which is used to install the bias magnetic source and is configured to adjust the distance between the bias magnetic source and the diamond particles; An electric translation stage, disposed on the platform, configured to achieve XYZ three-axis movement of the load; The loading platform is arranged on the electric translation platform and is used for placing the microwave radiation device to be tested.

2. The detection platform according to claim 1, characterized in that: The probe seat comprises: A manual screw-in translation stage, which is configured to achieve XYZ three-axis load movement; An adapter plate, used for fixing the manual screw-in displacement stage to the bracket; A universal cantilever, one end of which is connected to a triaxially displaceable connection portion on the manual screw-in displacement platform; The probe clamp is used to clamp the optical fiber probe, which is connected to the other end of the universal cantilever and can be adjusted in any direction through the universal cantilever.

3. The detection platform according to claim 1, characterized in that: The electric translation stage comprises: An XY axial electric displacement assembly, which is fixed to the surface of the platform and is configured to achieve XY biaxial load displacement through electric drive; The Z-axis manual displacement assembly is fixed to the top of the XY-axis electric displacement assembly and is configured to achieve Z-axis load movement by manual screwing.

4. The testing station according to claim 1, characterized in that: The bias magnetic source is a block-shaped permanent magnet; the magnetic source seat is a universal arm, which is installed on the bracket or the platform.

5. The testing station according to claim 1, characterized in that: The bias magnetic source is a plurality of annular permanent magnets; the magnetic source seat comprises a cylinder and an inner tube, the inner tube is fixed on the probe seat, the inner tube can be connected to the central through hole of the cylinder by threads, and the central through hole of the inner tube is used to fix the side of the optical fiber probe close to the diamond particles; a plurality of the annular permanent magnets are stacked and sleeved on the outside of the cylinder.

6. The testing station according to claim 1, characterized in that: It also includes an industrial camera, which is installed on the bracket or the platform through a camera seat.

7. A quantum detection device, using the detection platform as described in any one of claims 1 to 5, characterized in that: It also includes a control cabinet and a host computer electrically connected thereto, wherein the control cabinet includes: A laser output module, used for outputting excitation light, wherein the excitation light is configured to be coupled into the first optical fiber for transmission and irradiate the diamond grains to generate photoluminescence; A fluorescence collection module, used for collecting the photoinduced fluorescence and forming a detection signal; Functional integration module for detection signal preprocessing and drive signal control; The host computer is used for human-computer interaction, data processing and visualization imaging, and drive signal input / output.

8. The quantum detection device according to claim 7, characterized in that: It also comprises a microwave module electrically connected to the upper machine, and the microwave module is configured to provide a microwave signal to the microwave radiation device to be tested.

9. The quantum detection device according to claim 7, characterized in that: It also includes an industrial camera electrically connected to the host computer, and the industrial camera is installed on the bracket or the platform through a camera seat.

10. The quantum detection device according to claim 9, characterized in that The host computer includes a scanning interval automatic positioning module, which is configured to automatically plan the scanning interval of the object to be tested based on the shooting image of the object to be tested by the industrial camera. The host computer sends a driving signal according to the planned scanning interval to control the movement of the electric translation stage.

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