Rapid calibration device and method for projection of vehicle-mounted ultra-near field module

Abstract

The invention discloses a vehicle-mounted ultra-near field module projection rapid calibration device and method, and belongs to the technical field of vehicle-mounted optical display. The calibration method comprises the following steps: S1, setting calibration areas in calibration software as a small step area, a large step area and a qualified area; s2, controlling a projection module to carry out image projection; s3, controlling the ultra-near field module to overturn from the initial position to the Hall position, and then controlling the ultra-near field module to overturn by a preset initial value by taking the Hall position as an original point to obtain a first projection image; s4, judging a calibration area where the position reference point of the first projection image is located, and adopting a corresponding ultra-near field module overturning strategy according to the calibration area; and S5, carrying out projection calibration verification. The projection distance calibration efficiency of the production line is improved, and the production takt requirement can be met.

Description

Technical Field

[0001] This invention relates to a rapid calibration device and method for vehicle-mounted ultra-near-field module projection, belonging to the field of vehicle-mounted optical display technology. Background Technology

[0002] Currently, with the continuous development of automotive lighting projection technology, automakers have added interactive functions and scenarios such as dynamic games to the projection of simple information such as images, videos and text at close range to the front of the car. This places high tolerance requirements on the projection distance between the left and right headlights at close range, otherwise it will affect the user experience.

[0003] However, due to factors such as dimensional tolerances and deformation of plastic parts, consistency of Hall sensor positions, and motor accuracy, the initial projection distances of various lamps are inconsistent during actual production calibration. This leads to a wide range of calibration cycle time fluctuations, meaning that the calibration completion time for each product varies considerably, ranging from 60s to 150s. This fails to meet customer production cycle time requirements, resulting in wasted production capacity. Therefore, there is an urgent need to propose a calibration device and method that can shorten the calibration time for each product, thereby reducing the range of calibration cycle time fluctuations and improving production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a vehicle-mounted ultra-near field module projection rapid calibration device and method, which improves the efficiency of projection distance calibration on the production line and can meet the production cycle requirements.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] This invention provides a method for rapid calibration of projection of an on-board ultra-near-field module, specifically including the following steps:

[0007] Step S1: In the calibration software, set the calibration area to small step area, large step area, and qualified area;

[0008] Step S2: Control the projection module to project the image;

[0009] Step S3: Control the ultra-near field module to flip from the initial position to the Hall position, and then control the ultra-near field module to flip the preset initial value with the Hall position as the origin to obtain the first projected image;

[0010] Step S4: Determine the calibration area where the position reference point of the first projected image is located, and adopt the corresponding ultra-near field module flipping strategy according to the calibration area.

[0011] Step S5: Perform projection calibration verification.

[0012] Furthermore, the image in step S2 is a simulated near beam cutoff line chart.

[0013] Furthermore, the location reference point is the inflection point of the simulated low beam cutoff line chart.

[0014] Furthermore, in step 4, determining the calibration area where the position reference point of the first projected image is located, and adopting a corresponding near-field module flipping strategy based on the calibration area, specifically includes the following steps:

[0015] Step S41: Determine whether the position reference point of the first projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S42.

[0016] Step S42: Determine whether the position reference point of the first projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43.

[0017] Step S43: Control the ultra-near field module to flip the large step value to obtain the second projected image;

[0018] Step S44: Determine whether the position reference point of the second projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S45.

[0019] Step S45: Determine whether the position reference point of the second projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43.

[0020] Step S46: Control the ultra-near field module to flip the small step value to obtain the third projection image;

[0021] Step S47: Determine whether the position reference point of the third projected image is within the qualified area. If yes, proceed to step S5; otherwise, repeat step S46.

[0022] Furthermore, in step S5, the projection calibration verification is performed, which specifically includes the following steps:

[0023] Step S51: Calculate the total flip value with the Hall position as the origin;

[0024] Step S52: Control the ultra-near field module to return to the initial position, then control the ultra-near field module to flip from the initial position to the Hall position, and then control the ultra-near field module to flip around the Hall position as the origin to calculate the total flip value, and obtain the fourth projection image;

[0025] Step S53: Determine whether the position reference point of the fourth projected image is within the qualified area. If yes, the projection calibration is qualified; otherwise, the projection calibration is unqualified.

[0026] Furthermore, the formula for calculating the total flip value with the Hall position as the origin is as follows:

[0027] C = A + m × Y1 + n × Y2;

[0028] Where C is the total flip value with the Hall position as the origin;

[0029] A is a preset initial value;

[0030] Y1 represents the large step value;

[0031] m is the number of times the large step value is flipped;

[0032] Y2 is the small step value;

[0033] n is the number of times the small step value is flipped.

[0034] Another aspect of the present invention provides a rapid calibration method for vehicle-mounted ultra-near field module projection, including a projection module, a projection module fixing fixture, an ultra-near field module, an ultra-near field module fixing fixture, an amplifier, a camera, a calibration board, a control component, and calibration software;

[0035] The projection module is fixed on the projection module fixing fixture, the ultra-near field module is fixed on the ultra-near field module fixing fixture, the ultra-near field module and the projection module are coaxially arranged, and the image projected by the projection module passes through the ultra-near field module and the amplifier in sequence before being projected onto the calibration plate.

[0036] The camera is used to capture projected images on the calibration board;

[0037] The calibration software is used to control the projection module to project images, identify the position of the projected image based on the projected image captured by the camera, and then send a projection angle adjustment command to the control component based on the position information of the projected image.

[0038] The control component is used to control the ultra-near field module to adjust the reflection angle according to the projection angle adjustment command.

[0039] Furthermore, the projection module fixing fixture includes a first support member, a guide rail, and a projection module fixing bracket;

[0040] The first support member is provided with a guide rail, the projection module fixing bracket is slidably connected to the guide rail, and the projection module is mounted on the projection module fixing bracket.

[0041] Furthermore, the ultra-near-field module fixing fixture includes a second support member, an ultra-near-field module fixing bracket, and a clamping assembly;

[0042] The second support member is provided with an ultra-near field module fixing bracket and a clamping assembly. The ultra-near field module is disposed in the ultra-near field module fixing bracket, and the clamping assembly is used to clamp and fix the ultra-near field module in the ultra-near field module fixing bracket.

[0043] Furthermore, it also includes a first cabinet and a second cabinet, with the first cabinet located on one side of the second cabinet;

[0044] The first cabinet is equipped with a calibration device, and the calibration software is installed in the calibration device;

[0045] The camera and calibration board are housed in the second cabinet. The second cabinet has a window on the upper side wall near the first cabinet, and the amplifier is embedded in the window.

[0046] By adopting the above technical solution, the present invention has the following beneficial effects:

[0047] This invention innovates upon traditional isochronous projection distance calibration by setting up a large step zone, a small step zone, and a pass / fail zone. When the projected image is in the large step zone, the ultra-near-field module is controlled to flip the large step value; when the projected image is in the small step zone, the ultra-near-field module is controlled to flip the small step value; when the projected image is in the pass / fail zone, the calibration is considered successful. This effectively improves the efficiency of projection distance calibration on the production line and meets production cycle requirements. Simultaneously, the calibration equipment incorporates guide rails to ensure the consistency of the projection module's position during each forward and backward sliding motion, reducing calibration errors and improving calibration accuracy. Furthermore, the calibration equipment includes an ultra-near-field module fixing bracket and clamping components to ensure the consistency of the ultra-near-field module's placement position each time, ensuring that the ultra-near-field module's position does not shift during the calibration process. Attached Figure Description

[0048] Figure 1 This is a front view of the projection module, projection module fixing fixture, ultra-near field module, ultra-near field module fixing fixture, and control component of the present invention.

[0049] Figure 2 This is a structural side view of the projection module, projection module fixing fixture, ultra-near field module, ultra-near field module fixing fixture, and control component of the present invention.

[0050] Figure 3 This is a top view of the projection module, projection module fixing fixture, ultra-near field module, ultra-near field module fixing fixture, and control component of the present invention.

[0051] Figure 4 This is an overall side view of the vehicle-mounted ultra-near field module projection rapid calibration device of the present invention;

[0052] Figure 5 This is an overall front view of the vehicle-mounted ultra-near-field module projection rapid calibration device of the present invention;

[0053] Figure 6 This is a flowchart of the rapid calibration method for vehicle-mounted ultra-near-field module projection according to the present invention. Detailed Implementation

[0054] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0055] Example 1

[0056] like Figure 1 and 4 As shown, this embodiment provides a vehicle-mounted ultra-near-field module projection rapid calibration device, which improves the efficiency of projection calibration on the production line and solves the problem of wide fluctuations in the calibration cycle time caused by errors in the initial projection distance of the lamps. The calibration device of this embodiment includes a projection module 1, a projection module fixing fixture, an ultra-near-field module 3, an ultra-near-field module fixing fixture, a fixing plate 10, an amplifier 5, a camera 9, a calibration plate 11, a control component 6, a calibration cabinet, a calibration device, and calibration software.

[0057] like Figure 4 and 5 As shown, the calibration cabinet includes a first cabinet 7 and a second cabinet 8, with the first cabinet 7 located to one side of the second cabinet 8. The first cabinet 7 houses a calibration device, in which calibration software is installed. The calibration software controls the projection module 1 to project images and identifies the position of the projected image based on the image captured by the camera 9. Then, it sends a projection angle adjustment command to the control component 6 based on the projected image position information. The second cabinet 8 houses the camera 9 and a calibration plate 11. A window is located on the upper side wall of the second cabinet 8 near the first cabinet 7, and an amplifier 5 is embedded in the window. The image projected by the projection module 1 passes sequentially through the ultra-near-field module 3 and the amplifier 5 before being projected onto the calibration plate 11. The camera 9 then captures the projected image on the calibration plate 11. The amplifier 5 can be a magnifying glass to magnify the projected image, improving the accuracy of the projected image recognition. The calibration plate 11 can be a black screen for clearly displaying the projected image. The second cabinet 8 is provided with two fixing slots, and a fixing plate 10 is fixed between the two fixing slots. The fixing plate 10 is used to fix the projection module fixing fixture and the ultra-near field module fixing fixture.

[0058] like Figure 1 , 2As shown in Figure 3, the core internal structure of the ultra-near field module 3 is a reflector. The projection angle is adjusted by adjusting the reflection angle of the reflector. The projection angle adjustment principle of this embodiment is the same as that of the ultra-near field module described in Chinese Utility Model Patent Application No. CN202420172674.9. In that patent, the control component is built into the ultra-near field module, while in this embodiment, the control component 6 is an external structure. The ultra-near field module fixing fixture includes a second support member 41, an ultra-near field module fixing bracket 42, and a clamping component 43. The second support member 41 includes a second support surface 411 and a second support column 412. The second support column 412 is fixed to the fixing plate 10 by screws. The ultra-near field module fixing bracket 42 and the clamping component 43 are provided on the second support surface 411. The ultra-near field module 3 is disposed in the ultra-near field module fixing bracket 42, and the clamping component 43 is used to clamp and fix the ultra-near field module 3 in the ultra-near field module fixing bracket 42. The ultra-near-field module fixing bracket 42 is a contour block for the ultra-near-field module 3, used to fix the ultra-near-field module 3 in place, ensuring the consistency of the ultra-near-field module 3's placement position each time. Since there is still some space inside the contour block after the ultra-near-field module 3 is placed, which may cause slight movement of the ultra-near-field module 3, a clamping assembly 43 is provided to further fix the ultra-near-field module 3. The clamping assembly 43 includes a cylinder 431, a clamping rod 432, and a clamping element 433. One end of the cylinder 431 is fixed to the second support surface 411, and the other end of the cylinder 431 is connected to one end of the clamping rod 432. The other end of the clamping rod 432 is connected to the clamping element 433. Driven by the cylinder 431, the clamping element 433 clamps and fixes the ultra-near-field module 3 in the ultra-near-field module fixing bracket 42.

[0059] like Figure 1 , 2As shown in Figure 3, the projection module 1 is used for image projection and has megapixel count. The projection module fixing fixture includes a first support member 21, a guide rail 22, and a projection module fixing bracket 23. The first support member 21 includes a first support surface 211 and a first support column 212. The first support column 212 is fixed to the fixing plate 10 by screws. The first support column 212 and the second support column 412 are used to raise the projection module 1 and the ultra-near field module 3, respectively, so that the projection module 1, the ultra-near field module 3, and the amplifier 5 are on the same horizontal axis. The guide rail 22 is fixed to the first support surface 211 by screws. The projection module fixing bracket 23 is slidably connected to the guide rail 22, and the projection module 1 is mounted on the projection module fixing bracket 23. During projection calibration, the projection module 1 needs to extend into the interior of the ultra-near-field module 3 so that the image projected by the projection module 1 can directly reach the reflector inside the ultra-near-field module 3, reducing light divergence and improving the accuracy of projection calibration. Therefore, to ensure the consistency of the position of the projection module 1 during each forward and backward sliding motion, a guide rail 22 is provided on the first support surface 211, satisfying the requirement of coaxial setting of the projection module 1 and the ultra-near-field module 3. The projection module 1 and the projection module fixing bracket 23 can be moved along the axial direction of the ultra-near-field module 3 on the guide rail 22 by manual pushing, or a cylinder can be used to drive the projection module 1 and the projection module fixing bracket 23 to move along the axial direction of the ultra-near-field module 3 on the guide rail 22.

[0060] like Figure 1 As shown, the control component 6 is used to control the ultra-near field module 3 to adjust the reflection angle according to the projection angle adjustment command sent by the calibration software, as can be seen in Chinese utility model patent application number CN202420172674.9.

[0061] Example 2

[0062] like Figure 6 As shown, this embodiment provides a calibration method for a vehicle-mounted ultra-near-field module projection rapid calibration device as described in Embodiment 1. It improves upon traditional isochronous calibration by using a "major-minor step" calibration method, combined with a reasonable tolerance range and automatic calibration equipment, increasing calibration efficiency to over 50%, thus meeting production requirements. The specific steps include:

[0063] Step S1: In the calibration software, set the calibration area to a small step area, a large step area, and a qualified area, and start the calibration equipment by pressing the button. For example, when the standard required projection distance is 3.3m, the projection distance of 3.25~3.35m can be set as the qualified area, the projection distance of 3.35~3.65m as the small step area, and the projection distance >3.65m as the large step area.

[0064] Step S2: The calibration software controls the projection module to project images.

[0065] Specifically, the image can be a simulated low beam cutoff line chart, which is used to show the brightness cutoff line of a car's low beam headlights. The low beam cutoff line refers to the boundary line where the light changes from bright to dark when the car's low beam headlights illuminate the ground.

[0066] Step S3: The calibration software controls the ultra-near-field module to flip from its initial position to the Hall position, and then controls the ultra-near-field module to flip around the Hall position as the origin by a preset initial value to obtain the first projected image. The core structure of the ultra-near-field module is a reflector. By flipping the reflector, the reflection angle of the reflector is controlled, thereby adjusting the projection angle and obtaining projected images in different calibration areas.

[0067] Specifically, the initial position is where the light rays projected by the projection module are at a 2° downward angle from the horizontal direction. The Hall sensor in the ultra-near field module is a magnetic sensor used to detect the strength and direction of the magnetic field generated by a permanent magnet or electromagnet. When the direction of the magnetic field is parallel to the Hall sensor, this is the Hall position. The preset initial value can be set according to the actual projection distance requirements.

[0068] Step S4: Acquire the first projected image using a camera and send it to the calibration software for identification. Determine the calibration area where the position reference point of the first projected image is located, and adopt the corresponding ultra-near-field module flipping strategy according to the calibration area. The large step area represents that the number of flipping steps is ≥10 steps, the small step area represents that the number of flipping steps is ≤1 step, and the qualified area represents that the projection calibration is qualified, and the relationship between the number of steps and the projection angle is 1 step ≈ 0.2°.

[0069] Specifically, the location reference point is the inflection point of the simulated low beam cutoff line chart, that is, the turning point of the light and dark boundary line formed by the low beam headlights on the ground.

[0070] Specifically, a corresponding near-field module flipping strategy is adopted based on the calibration area, which includes the following steps:

[0071] Step S41: Determine whether the position reference point of the first projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S42.

[0072] Step S42: Determine whether the position reference point of the first projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43.

[0073] Step S43: Control the ultra-near field module to flip by a large step value, that is, control the reflector to flip by a large step angle to obtain the second projected image;

[0074] Step S44: Determine whether the position reference point of the second projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S45.

[0075] Step S45: Determine whether the position reference point of the second projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43.

[0076] Step S46: Control the ultra-near field module to flip a small step value, that is, control the mirror to flip a small step angle to obtain the third projection image;

[0077] Step S47: Determine whether the position reference point of the third projected image is within the qualified area. If yes, proceed to step S5; otherwise, repeat step S46.

[0078] Step S5: Perform projection calibration verification, that is, re-verify the projection based on the sum of the flip values ​​from the previous steps, specifically including the following steps:

[0079] Step S51: Calculate the total flip value with the Hall position as the origin.

[0080] Specifically, the formula for calculating the total flip value with the Hall position as the origin is as follows:

[0081] C = A + m × Y1 + n × Y2;

[0082] Where C is the total flip value with the Hall position as the origin;

[0083] A is a preset initial value;

[0084] Y1 is a large step value, which can be equal to 0;

[0085] m is the number of times the large step value is flipped;

[0086] Y2 is a small step value, which can be equal to 0;

[0087] n is the number of times the small step value is flipped.

[0088] Step S52: Control the ultra-near field module to return to the initial position, then control the ultra-near field module to flip from the initial position to the Hall position, and then control the ultra-near field module to flip around the Hall position as the origin to calculate the total flip value, and obtain the fourth projection image;

[0089] Step S53: Determine whether the position reference point of the fourth projected image is within the qualified area. If yes, the projection calibration is qualified; otherwise, the projection calibration is unqualified.

[0090] The working principle of this invention is as follows:

[0091] In the calibration software, the calibration area is set as a small step area, a large step area, and a qualified area; the projection module 1 is controlled to project an image; the ultra-near field module 3 is controlled to flip from the initial position to the Hall position, and then the ultra-near field module 3 is controlled to flip with the Hall position as the origin to a preset initial value to obtain the first projected image; the calibration area where the position reference point of the first projected image is located is determined, and the corresponding ultra-near field module flipping strategy is adopted according to the calibration area; projection calibration verification is performed.

[0092] This invention innovates upon traditional constant-step projection distance calibration by setting up a large-step zone, a small-step zone, and a qualified zone. When the projected image is in the large-step zone, the ultra-near-field module 3 is controlled to flip the large-step value; when the projected image is in the small-step zone, the ultra-near-field module 3 is controlled to flip the small-step value; when the projected image is in the qualified zone, the calibration is considered successful. This effectively improves the efficiency of projection distance calibration on the production line and meets production cycle requirements. Simultaneously, the calibration equipment includes a guide rail 22, which ensures the consistency of the projection module 1's position during each forward and backward sliding motion, reducing calibration errors and improving calibration accuracy. Furthermore, the calibration equipment includes an ultra-near-field module fixing bracket 42 and a clamping assembly 43, which ensures the consistency of the ultra-near-field module 3's placement position each time, ensuring that the ultra-near-field module 3's position does not shift during the calibration process.

[0093] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid calibration method for vehicle-mounted ultra-near-field module projection, characterized in that, Specifically, the steps include the following: Step S1: In the calibration software, set the calibration area to small step area, large step area, and qualified area; Step S2: Control the projection module to project the image; Step S3: Control the ultra-near field module to flip from the initial position to the Hall position, and then control the ultra-near field module to flip the preset initial value with the Hall position as the origin to obtain the first projected image; Step S4: Determine the calibration area where the position reference point of the first projected image is located, and adopt the corresponding ultra-near field module flipping strategy according to the calibration area. Step S5: Perform projection calibration verification.

2. The rapid calibration method for vehicle-mounted ultra-near-field module projection according to claim 1, characterized in that, The image in step S2 is a simulated near beam cutoff line chart.

3. The rapid calibration method for vehicle-mounted ultra-near-field module projection according to claim 2, characterized in that, The reference point is the inflection point of the simulated low beam cutoff line chart.

4. The rapid calibration method for vehicle-mounted ultra-near-field module projection according to claim 1, characterized in that, In step 4, the calibration area where the position reference point of the first projected image is located is determined, and the corresponding ultra-near field module flipping strategy is adopted according to the calibration area. Specifically, this includes the following steps: Step S41: Determine whether the position reference point of the first projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S42. Step S42: Determine whether the position reference point of the first projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43. Step S43: Control the ultra-near field module to flip the large step value to obtain the second projected image; Step S44: Determine whether the position reference point of the second projected image is within the qualified area. If yes, proceed to step S5; otherwise, proceed to step S45. Step S45: Determine whether the position reference point of the second projected image is located within the small step area. If yes, proceed to step S46; otherwise, proceed to step S43. Step S46: Control the ultra-near field module to flip the small step value to obtain the third projection image; Step S47: Determine whether the position reference point of the third projected image is within the qualified area. If yes, proceed to step S5; otherwise, repeat step S46.

5. The rapid calibration method for vehicle-mounted ultra-near-field module projection according to claim 1, characterized in that, In step S5, the projection calibration verification is performed, which specifically includes the following steps: Step S51: Calculate the total flip value with the Hall position as the origin; Step S52: Control the ultra-near field module to return to the initial position, then control the ultra-near field module to flip from the initial position to the Hall position, and then control the ultra-near field module to flip around the Hall position as the origin to calculate the total flip value, and obtain the fourth projection image; Step S53: Determine whether the position reference point of the fourth projected image is within the qualified area. If yes, the projection calibration is qualified; otherwise, the projection calibration is unqualified.

6. The rapid calibration method for vehicle-mounted ultra-near-field module projection according to claim 5, characterized in that, The formula for calculating the total flip value with the Hall position as the origin is as follows: C = A + m × Y1 + n × Y2; Where C is the total flip value with the Hall position as the origin; A is a preset initial value; Y1 represents the large step value; m is the number of times the large step value is flipped; Y2 is the small step value; n is the number of times the small step value is flipped.

7. A calibration device applying the rapid calibration method for vehicle-mounted ultra-near-field module projection as described in any one of claims 1 to 6, characterized in that, It includes a projection module (1), a projection module fixture, an ultra-near field module (3), an ultra-near field module fixture, an amplifier (5), a camera (9), a calibration board (11), a control component (6), and calibration software; The projection module (1) is fixed on the projection module fixture, and the ultra-near field module (3) is fixed on the ultra-near field module fixture. The ultra-near field module (3) and the projection module (1) are coaxially arranged. The image projected by the projection module (1) passes through the ultra-near field module (3) and the amplifier (5) in sequence and is then projected onto the calibration plate (11). The camera (9) is used to capture projected images on the calibration plate (11); The calibration software is used to control the projection module (1) to project images, and to identify the position of the projected image based on the projected image captured by the camera (9). Then, it sends a projection angle adjustment command to the control component (6) based on the position information of the projected image. The control component (6) is used to control the ultra-near field module (3) to adjust the reflection angle according to the projection angle adjustment command.

8. The calibration device according to claim 7, characterized in that, The projection module fixing fixture includes a first support (21), a guide rail (22), and a projection module fixing bracket (23); The first support member (21) is provided with a guide rail (22), the projection module fixing bracket (23) is slidably connected to the guide rail (22), and the projection module (1) is set on the projection module fixing bracket (23).

9. The calibration device according to claim 7, characterized in that, The ultra-near field module fixing fixture includes a second support (41), an ultra-near field module fixing bracket (42), and a clamping assembly (43); The second support member (41) is provided with an ultra-near field module fixing bracket (42) and a clamping assembly (43). The ultra-near field module (3) is disposed in the ultra-near field module fixing bracket (42), and the clamping assembly (43) is used to clamp and fix the ultra-near field module (3) in the ultra-near field module fixing bracket (42).

10. The calibration device according to claim 7, characterized in that, It also includes a first cabinet (7) and a second cabinet (8), with the first cabinet (7) located on one side of the second cabinet (8); The first cabinet (7) is equipped with a calibration device, and the calibration software is installed in the calibration device; The camera (9) and calibration plate (11) are installed inside the second cabinet (8). The second cabinet (8) has a window on the upper side wall near the first cabinet (7), and the amplifier (5) is embedded in the window.

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