Wide-area laser target spot tracking device
By designing an interlaced semi-cylindrical target base and a flexible mounting base, the problem of data loss and error caused by cluttered target points in traditional laser scanning is solved, achieving efficient and low-cost laser measurement.
Patent Information
- Application Number
- CN202423135476.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In traditional laser scanning methods, part measurement requires attaching multiple messy magnetic targets, which leads to data loss and large errors, and the process is complex and costly.
The system employs multiple semi-cylindrical target bases, with an interlocking rectangular plane design to ensure that the reflector can reflect the laser from multiple angles. Combined with a flexible mounting base and scale lines, the installation process is simplified and data reliability is improved.
It reduces data loss and errors, reduces the number of target points, lowers development and processing costs, and improves data confidence and measurement accuracy.
Smart Images
Figure CN223636801U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the present application relates to the vehicle measurement technical field, in particular to a wide-area laser tracking target device. BACKGROUND
[0002] At present, in most host factories, the part measurement means gradually becomes rich, and is gradually changed from the contact measurement to the non-contact measurement, and the part size information is acquired through the three coordinates, the laser scanning and the like.
[0003] When the laser scanning mode is used to acquire the part size information, the reflective positioning target points need to be arranged around the part, and a detection reference system is established according to the target points, so as to facilitate the identification of the tracking instrument and ensure that the scanning is completed in the same reference system. In the traditional scanning target point type, a circular sheet type or a cylindrical type with magnetism is generally used, and the scanning target point is adsorbed on the measured object through the magnetic force. 20-30 points need to be pasted on the whole vehicle or large parts, and the pasting positions are disorderly and have poor regularity. SUMMARY
[0004] The embodiment of the present application provides a wide-area laser tracking target device, and relates to the vehicle measurement technical field. Through the plurality of target bases which are staggered with each other, no matter how the scanner is oriented, the single target can always reflect back the effective data. The error caused by the data loss and the layering in the traditional measurement mode is reduced, and the confidence of the data is improved.
[0005] In a first aspect, the embodiment of the present application provides a wide-area laser tracking target device, which comprises a mounting seat and a plurality of target bases.
[0006] The target bases are all in a semicylindrical structure, and a reflective sheet is arranged on the rectangular plane of the target base, and the reflective sheet is used for reflecting the detection laser; the semicircular planes of the target bases are spliced with each other, and the rectangular planes of the adjacent two target bases are staggered with each other, so that the reflective sheet can reflect the detection laser at multiple angles.
[0007] One side of the mounting seat is connected to the semicircular plane of one end target base, and the other side is mounted on a flexible measurement support, so as to fix the mounting seat and the target bases.
[0008] Optionally, according to the wide-area laser tracking target device provided by the present application, the centers of the mounting seat and the target bases are located on the same straight line.
[0009] Optionally, according to the wide-area laser tracking target device provided by the present application, the included angle between the rectangular planes of the adjacent two target bases is 30° to 45°.
[0010] Optionally, the wide-area laser tracking target point device according to the present application, the angle between the rectangular planes of the two adjacent target point bases is 45°.
[0011] Optionally, the wide-area laser tracking target point device according to the present application, the rectangular plane of the target point base is provided with a counterpoint circular groove arranged in a counterbore, and the reflector is arranged in the counterpoint circular groove.
[0012] Optionally, the wide-area laser tracking target point device according to the present application, the reflector is pasted and connected between the counterpoint circular groove.
[0013] Optionally, the wide-area laser tracking target point device according to the present application, the semicircular plane of the target point base away from the other end of the mounting base is further provided with a scale line, the scale line divides the semicircular plane of the target point base into a plurality of regions, and the scale line is used for installation indication of the target point base.
[0014] Optionally, the wide-area laser tracking target point device according to the present application, the angle between the two adjacent scale lines is 30°.
[0015] Optionally, the wide-area laser tracking target point device according to the present application, each region in the semicircular plane of the target point base is provided with a serial number, and the serial numbers of the regions increase in turn in a clockwise direction.
[0016] Optionally, the wide-area laser tracking target point device according to the present application, a threaded hole is arranged at the center of the mounting base, and the threaded hole is used for fixed connection between the mounting base and the flexible measuring support.
[0017] The present application brings the following beneficial effects:
[0018] I. The use of the laser scanning target point can reduce the number of development of the previous circular magnetic counterpoint and cylindrical magnet counterpoint, and reduce the development cost.
[0019] II. The tracking target point device in this form has a cylindrical prototype, fewer processing procedures, easy processing, small size, and reduced manufacturing cost.
[0020] III. Using the laser tracking target point, the carrier can be installed on the fixed bolt position of the support, and the top has a scale line, which can be used as a position reference.
[0021] IV. The installation efficiency of the target point is greatly improved. In the traditional scanning mode, 20-30 points need to be pasted for the whole vehicle or large parts. After the wide-area laser tracking target point is put into use, only 6-7 tracking target point devices need to be installed. No matter how the scanner is oriented, a single target point can always reflect back effective data. The error introduced by data loss, layering and other problems in the traditional measurement method is reduced, and the confidence of the data is improved. [Attached Image Description]
[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 A schematic diagram of a wide-area laser target tracking device provided in this application embodiment;
[0024] Figure 2 This is a schematic diagram showing the distribution of scale lines on the end target base provided in an embodiment of this application.
[0025] Explanation of reference numerals in the attached figures:
[0026] 1-Mounting base; 2-Target base; 3-Reflector; 4-Attachment groove; 5-Scale line; 6-Area.
Detailed Implementation Methods
[0027] To better understand the technical solutions in this specification, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0028] It should be understood that the described embodiments are merely some, not all, of the embodiments in this specification. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without inventive effort are within the scope of protection of this specification.
[0029] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0030] Currently, traditional scanning target points are generally magnetic circular or cylindrical sheets that are magnetically attached to the object being tested. For a whole vehicle or large parts, 20-30 points need to be attached, and the points are placed randomly and without regularity.
[0031] In view of this, according to Figure 1 and Figure 2 As shown, this application provides a wide-area laser tracking target device, including a mounting base 1 and multiple target bases 2. In this embodiment, the tracking target structure is an integral cylindrical structure with a length of 160 mm and a top surface diameter of 30 mm.
[0032] The target base 2 is a semi-cylindrical structure, and a reflector 3 is provided on the rectangular plane of the target base 2. The reflector 3 is used to reflect the detection laser. The semi-circular planes of the target base 2 are spliced together, and the rectangular planes of two adjacent target bases 2 are staggered, so that the reflector 3 can reflect the detection laser from multiple angles.
[0033] In this embodiment, various target shape possibilities, including polyhedra and ellipsoids, are tested to assess the effectiveness of different target base shapes in improving reflectivity and omnidirectional visibility. Through a series of simulation tests and experimental verifications, it was found that while polyhedra possess multi-angle reflection capabilities, their complex manufacturing process increases processing costs by 30%, and manufacturing errors are prone to occur, resulting in poor consistency, thus making them unsuitable for large-scale applications. While ellipsoids show good reflection at certain specific angles, experimental data shows that their reflection data recovery rate fluctuates significantly at different angles, with a maximum deviation of up to 20%, failing to maintain stable reflection performance across all angles and thus failing to meet the expected measurement accuracy requirements.
[0034] To better meet specific application requirements, and considering manufacturing costs, processing difficulty, and ease of on-site operation, a cylindrical design was ultimately chosen. Experimental data shows that the cylindrical design offers advantages in terms of simple and easy processing, low manufacturing costs, and the ability to provide a uniform and sufficient reflective surface across the entire 360° circumference. Experimental data also demonstrates that the cylindrical target design achieves at least 95% effective recovery of reflection data at any angle, thus meeting the omnidirectional reflection requirements of laser scanning and ensuring stable measurement data acquisition across different scanning directions.
[0035] One side of the mounting base 1 is connected to the semi-circular plane of one end of the target base 2, and the other side is mounted on the flexible measuring bracket to fix the mounting base 1 and the target base 2.
[0036] Furthermore, in this embodiment, the target base 2 needs to be rotated circumferentially to adjust the initial orientation of the reflector 3 on each target base 2. Therefore, the centers of the mounting base 1 and the target base 2 in this application are located on the same straight line, so that when the mounting base 1 is rotated, the rotation angle of all other target bases 2 is the same.
[0037] Furthermore, the included angle between the rectangular planes of two adjacent target bases 2 is 30° to 45°.
[0038] Further, as a preferred embodiment, the angle between the rectangular planes of two adjacent target bases 2 in the present application is 45°. In order to reduce the number of target points and ensure the quality of scanning data, the number of target bases 2 is 7. The relative orientations of each layer section differ by 45°. In theory, setting 5 target bases 2 can play a target role within 360°, but in order to improve the reflectivity of effective information, 2 additional auxiliary target bases 2 are added.
[0039] The 7-layer retroreflective sheeting 3 of the target design, of which 5 layers away from the mounting base 1 are the main active layers, and 2 layers close to the mounting base 1 are auxiliary layers, are used to enhance the reflection effect. This hierarchical design not only ensures that the reflection intensity is maximized, but also ensures that the target has excellent performance in various measurement environments by distributing different functional reflection layers. For example, the increase of auxiliary layers can effectively deal with uncertain factors caused by changes in light, angle deviation and aging of the retroreflective sheeting 3, thereby ensuring the stability of the measurement data in different environments. In addition, through this design, the reflection effect can be ensured not to be significantly affected in extreme conditions, such as low light environment or high reflectivity surface, further improving the adaptability of the system and the reliability of the data.
[0040] Further, the rectangular plane of the target base 2 is provided with a target point circular groove 4 set by counterbore, the retroreflective sheeting 3 is arranged in the target point circular groove 4, and the retroreflective sheeting 3 and the target point circular groove 4 are connected by pasting. In the embodiment of the present application, the center of the target point circular groove 4 is located at the center of the rectangular plane of the target base 2. The target point circular groove 4 set by counterbore can effectively position the retroreflective sheeting 3 when the retroreflective sheeting 3 is installed. The retroreflective sheeting 3 and the target point circular groove 4 can be connected by double-sided adhesive or other pasting tools.
[0041] Further, the semicircular plane of the target base 2 at the other end away from the mounting base 1 is also provided with a scale line 5, which divides the semicircular plane of the target base 2 into a plurality of regions 6. The scale line 5 is used for installation indication of the target base 2.
[0042] Further, as a preferred embodiment, the angle between the two adjacent scale lines 5 in the present application is 30°. The target design is based on the demand for omnidirectional reflection capability in the laser measurement process, and its core logic is to provide a unified, efficient and consistent installation method through reasonable geometric distribution and scale reference. In order to meet the demand for efficient measurement, 5 scale lines 5 are designed on the semicircular plane of the end target base 2, and the angle between the two adjacent scale lines 5 is 30°, which divides the top surface into 6 regions 6. These scale lines 5 not only provide position reference for installation, but also ensure the standardization of installation through numbering, reducing errors caused by human subjective factors.
[0043] Further, each area 6 in the semicircular plane of the target base 2 is provided with a serial number, and the serial numbers of the areas 6 are sequentially increased in a clockwise direction, which simplifies the installation process and improves the consistency and accuracy of part measurement.
[0044] Further, a threaded hole is arranged at the center of the mounting base 1, which is used to facilitate the installation of the tracking target device on a flexible measurement support. For whole vehicle measurement, a masking paper can be attached to the bottom of the target, which is directly attracted to the body panel by magnetic force, and the masking paper can also effectively protect the vehicle paint surface from damage.
[0045] When using the tracking target device, first, the circular reflective sheet 3 is pasted in each layer of the pasting point circular groove 4. According to the measurement task, the tracking target is installed on the measurement support or the whole vehicle. Usually, 6 to 7 tracking target devices are used during measurement to ensure that the space formed by the points has at least one three-dimensional linearly independent vector group, which facilitates the construction of a spatial rectangular coordinate system in subsequent scanning. After completing the target arrangement, the positioning target points are collected by the scanner, and the scanning of the part can begin.
[0046] The design innovatively changes the traditional target point that can only be detected in a single direction to a target point that can be detected in all directions through the principle of laser scanning and global tracking of the target point. The improved target point design effectively reduces the workload of repeatedly pasting the reflective sheet 3 and avoids the situation of too many pasted points remaining on the part. In addition, since the target point can be detected in all directions, regardless of how the scanner moves, there are always enough effective target points in space, thereby avoiding the loss and layering of measurement data and ensuring the accuracy of the results.
[0047] The above only describes the preferred embodiments of the present specification and does not limit the present specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present specification shall be included in the scope of protection of the present specification.
Claims
1. A wide-area laser tracking target device, comprising: The mounting base and the plurality of target point bases are provided. The target point bases are all in a semi-cylindrical structure, and a reflective sheet is arranged on the rectangular plane of the target point base, which is used for reflecting detection laser beams; the semi-circular planes of the target point bases are spliced with each other, and the rectangular planes of the adjacent two target point bases are staggered with each other, so that the reflective sheet can reflect detection laser beams at multiple angles. One side of the mounting base is connected to the semi-circular plane of one end target point base, and the other side is mounted on a flexible measuring support to fix the mounting base and the target point bases.
2. The wide-area laser tracking target device of claim 1, wherein, The centers of the mounting base and the target point bases are located on the same straight line.
3. The wide-area laser tracking target device of claim 1, wherein, The included angle between the rectangular planes of the adjacent two target point bases is 30° to 45°.
4. The wide-area laser tracking target device of claim 3, wherein, The included angle between the rectangular planes of the adjacent two target point bases is 45°.
5. The wide-area laser tracking target device of claim 1, wherein, A point-pasting circular groove is arranged in the rectangular plane of the target point base, and the reflective sheet is arranged in the point-pasting circular groove.
6. The wide-area laser tracking target device of claim 5, wherein, The reflective sheet is pasted and connected with the point-pasting circular groove.
7. The wide-area laser tracking target device of claim 1, wherein, The semi-circular plane of the target point base away from the other end of the mounting base is also provided with a scale line, which equally divides the semi-circular plane of the target point base into a plurality of regions, and the scale line is used for installation indication of the target point base.
8. The wide-area laser tracking target device of claim 7, wherein, The included angle between the adjacent two scale lines is 30°.
9. The wide-area laser tracking target device of claim 7, wherein, Each region in the semi-circular plane of the target point base is provided with a serial number, and the serial numbers of the regions are sequentially increased in a clockwise direction.
10. The wide-area laser tracking target device of any one of claims 1 to 9, wherein, A threaded hole is arranged at the center of the mounting base, which is used for fixed connection between the mounting base and the flexible measuring support.