A calibration device and system for differential absorption lidar
Patent Information
- Application Number
- CN202521976009.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-09-15
AI Technical Summary
但是，该方案的主要问题在于，其在硬件结构上引入了较高的复杂度
由上述技术方案可知，本申请实施例的差分吸收激光雷达的校正装置包括固定支架和分角盘，所述固定支架配置为环形结构，所述固定支架包括支撑面，所述支撑面设有凹槽，所述分角盘旋转布置于所述凹槽内，所述分角盘配置为非封闭环形结构，其具有中空空间，且开设有沿径向方向的接收缺口，其中，所述固定支架用于与差分吸收激光雷达的安装架连接，所述分角盘用于变换校正信号的接收区域，由于可以将可旋转的分角盘利用固定支架安装在差分吸收激光雷达的安装架上，通过旋转该分角盘变换校正信号的接收区域，得到不同接收区域的校正信号，可以避免引入复杂的硬件结构，可在实现简化了校正装置的同时，保证了对维护后的差分吸收激光雷达的有效地校正。
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Figure CN224732166U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lidar technology, specifically to gas concentration detection lidar technology, differential absorption lidar technology, and other technical fields, and particularly to a correction device and system for differential absorption lidar. Background Technology
[0002] Differential absorption lidar is primarily used for measuring the atmospheric composition concentration profile of a target. During the maintenance of lidar optical components, especially the transmitting system, changes in the output optical characteristics of the differential pair are inevitable. Even if the lidar's near-range inversion results have been corrected using algorithms at the factory, the beam output characteristics of the differential pair have changed after the lidar's optical components are maintained, rendering the original correction algorithms ineffective at near range.
[0003] Currently, the relevant technical solutions utilize multiple telescopes as correction devices to obtain close-range inversion results. However, the main problem with this approach is the high complexity introduced into the hardware structure. As the demand for detection increases, the number of telescopes needs to be increased accordingly, further increasing equipment complexity and cost.
[0004] Therefore, there is an urgent need for a calibration device for differential absorption lidar to effectively calibrate the lidar after maintenance. Utility Model Content
[0005] To address the aforementioned problems in the existing technology, this utility model provides a calibration device and system for differential absorption lidar, which simplifies the calibration device while effectively calibrating the lidar after maintenance.
[0006] This application provides a correction device for a differential absorption lidar, comprising: a fixed bracket and a bisector disk; The fixing bracket is configured as a ring structure, and the fixing bracket includes a support surface, the support surface being provided with a groove; The angle-dividing disk is rotatably arranged in the groove. The angle-dividing disk is configured as a non-closed annular structure with a hollow space and a receiving notch in the radial direction. The fixed bracket is used to connect with the mounting bracket of the differential absorption lidar, and the angle plate is used to change the receiving area of the correction signal.
[0007] Optionally, the groove is arranged on the inner side of the annular structure, and the groove is circular.
[0008] Optionally, the support surface is further provided with a reference mark, which is arranged circumferentially around the outer periphery of the groove.
[0009] Optionally, the number of reference markers is multiple, and the interval angle between each pair of adjacent reference markers is configured as a preset first angle.
[0010] Optionally, the annular structure includes either a circle or a regular polygon.
[0011] Optionally, the support surface is further provided with multiple through holes, and the fixing bracket is detachably connected to the mounting bracket of the differential absorption lidar through the multiple through holes.
[0012] Optionally, the receiving notch is used for the passage of the correction signal, and the opening angle of the receiving notch is configured as a preset second angle.
[0013] Optionally, the upper side of the angle disc is provided with a plurality of handles evenly arranged circumferentially.
[0014] Optionally, the diameter of the hollow space is matched with the structure of the reflector of the differential absorption lidar.
[0015] In another embodiment of this utility model, a calibration system for a differential absorption lidar is provided. The calibration system for the differential absorption lidar includes a mounting bracket for the differential absorption lidar, a reflector for the differential absorption lidar, and a calibration device for the differential absorption lidar as described in the above embodiment. The fixed bracket is connected to the mounting frame of the differential absorption lidar; The hollow space of the angle disk accommodates the reflector of the differential absorption lidar.
[0016] Based on the technical solution provided above, the following beneficial effects can be achieved: As can be seen from the above technical solution, the calibration device for the differential absorption lidar in this application embodiment includes a fixed bracket and a split disk. The fixed bracket is configured as a ring structure and includes a support surface with a groove. The split disk is rotatably arranged in the groove and is configured as a non-closed ring structure with a hollow space and a radially oriented receiving notch. The fixed bracket is used to connect to the mounting frame of the differential absorption lidar, and the split disk is used to change the receiving area of the calibration signal. Since the rotatable split disk can be mounted on the mounting frame of the differential absorption lidar using the fixed bracket, and the receiving area of the calibration signal can be changed by rotating the split disk to obtain calibration signals for different receiving areas, the introduction of complex hardware structures can be avoided. This simplifies the calibration device while ensuring effective calibration of the differential absorption lidar after maintenance.
[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A schematic diagram of the structure of a correction device for a differential absorption lidar provided in one embodiment of this application; Figure 2 A schematic diagram of the structure of the fixing bracket of the correction device for a differential absorption lidar provided in one embodiment of this application; Figure 3 A schematic diagram of the angle disk structure of the correction device for a differential absorption lidar provided in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a differential absorption lidar correction system provided in another embodiment of this application.
[0020] Label Explanation A calibration device for a 10-differential absorption lidar; 11. Fixed bracket; 111 support surface; 112 grooves; 113. The inner surface of the ring structure; 114 Reference Markers; 115 through hole; 12-minute disc; 121 hollow space; 122 receiving gap; 123 handle; Correction system for 20 differential absorption lidar; 21 mounting brackets; 22. Reflector. Detailed Implementation
[0021] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments of the present utility model are now described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.
[0022] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.
[0023] To keep the drawings concise, only the parts related to this utility model are shown schematically in each drawing, and do not represent their actual structure as a product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of this utility model is provided with reference to the accompanying drawings and embodiments.
[0025] In one embodiment, such as Figures 1 to 3 As shown, where, Figure 1 This is a schematic diagram of the correction device for the differential absorption lidar in this embodiment; Figure 2 This is a schematic diagram of the fixed bracket of the correction device for the differential absorption lidar in this embodiment; Figure 3 This is a schematic diagram of the angle disk structure of the correction device for a differential absorption lidar.
[0026] In this embodiment, a differential absorption lidar calibration device 10 is provided, which may include a fixed bracket 11 and a bisector disk 12.
[0027] The fixed bracket 11 is configured as a ring structure, and the fixed bracket 11 includes a support surface 111, the support surface 111 being provided with a groove 112.
[0028] The angle-dividing disk 12 is rotatably arranged in the groove 112. The angle-dividing disk 12 is configured as a non-closed annular structure, which has a hollow space 121 and a receiving notch 122 in the radial direction.
[0029] The fixed bracket 11 is used to connect to the mounting bracket of the differential absorption lidar, and the angle plate 12 is used to change the receiving area of the correction signal.
[0030] Based on the above structure, the differential absorption lidar calibration device in this embodiment has a fixed bracket connected to the mounting frame of the differential absorption lidar and a rotatable angle disk. The angle disk is arranged in the groove of the fixed bracket. By changing the position of the receiving notch of the angle disk, the receiving area of the calibration signal can be changed, and signals for calibration from multiple different angle areas can be obtained. This simplifies the calibration device while ensuring effective calibration of the differential absorption lidar after maintenance.
[0031] In this embodiment, as Figure 1 and Figure 2 As shown, the groove 112 is arranged on the inner side 113 of the annular structure, and the groove 112 is circular.
[0032] Here, the diameter of the angle plate 12 is matched with the diameter of the inner groove 112 of the fixing bracket, thus providing support. In this embodiment, as Figure 1 and Figure 2 As shown, the support surface 111 is also provided with a reference mark 114, which is arranged circumferentially around the outer periphery of the groove 112.
[0033] Preferably, there are multiple reference marks 114, and the interval angle between each pair of adjacent reference marks 114 is configured as a preset first angle.
[0034] For example, such as Figures 1 to 2 As shown, the preset first angle can be 5 degrees. Alternatively, the preset first angle can be the same as the opening angle of the receiving notch.
[0035] In this embodiment, the annular structure includes either a circle or a regular polygon.
[0036] like Figure 1 and Figure 2 As shown, preferably, the annular fixed bracket 11 can be a regular octagon. This makes it easier to assemble with the mounting bracket and improves the stability of the bracket installation.
[0037] In this embodiment, the support surface 111 is also provided with a plurality of through holes 115, and the fixed bracket 11 is detachably connected to the mounting bracket of the differential absorption lidar through the plurality of through holes 115.
[0038] like Figure 1 and Figure 2 As shown, preferably, when the ring-shaped fixing bracket 11 is a regular octagon, the number of through holes 115 is 8. The through holes 115 can be set in the top corner area, or the through holes 115 can be not set in the top corner area.
[0039] Here, the through hole 115 can be used as a mounting hole for inserting or removing bolt studs. The fixing bracket 11 can be screwed into the mounting holes of the differential absorption lidar mounting bracket through multiple through holes 115.
[0040] In this embodiment, as Figure 1 and Figure 3 As shown, the receiving notch 122 of the angle disc 12 is used for the passage of the correction signal, and the opening angle of the receiving notch 122 is configured as a preset second angle.
[0041] Here, the correction signal can be an optical echo signal used for correction. The correction signal can include a first optical echo signal and a second optical echo signal. The first optical echo signal can be an optical echo signal measured using a correction device after the differential absorption lidar has been factory calibrated. The second optical echo signal can be an optical echo signal measured using a correction device after the differential absorption lidar has been maintained.
[0042] Specifically, the preset second angle can be determined based on the calibration test time and the detection distance.
[0043] Understandably, a smaller preset second angle value requires more testing time; a smaller preset second angle value also results in a smaller effective receiving area and a shorter detection distance. Conversely, a preset second angle value that is too large results in fewer sets of correction signals, which may make it difficult to guarantee the effectiveness of the correction.
[0044] Preferably, the preset value of the second angle can be 10 degrees or 20 degrees.
[0045] In this way, the rotatable angle disk with the receiving notch 122 can independently retain different working angle ranges of the telescope.
[0046] In this embodiment, as Figure 1 and Figure 3 As shown, the upper side of the angle plate 12 is provided with a plurality of handles 123 evenly arranged in the circumferential direction.
[0047] Here, a handle 123 is fixed on the angle disc 12 to facilitate the rotation of the angle disc 12.
[0048] In this embodiment, the diameter of the hollow space matches the structure of the reflector of the differential absorption lidar.
[0049] Please see Figure 4 , Figure 4 This is a structural diagram of the correction system for a differential absorption lidar.
[0050] In another embodiment of this utility model, such as Figure 4 As shown, a differential absorption lidar calibration system 20 is provided, including a differential absorption lidar mounting bracket 21, a differential absorption lidar reflector 22, and a differential absorption lidar calibration device 10 as described in the above example.
[0051] The fixed bracket 11 is connected to the mounting bracket 21 of the differential absorption lidar.
[0052] The hollow space 121 of the angle disc 12 ( Figure 4(Not shown) A reflector 22 that houses the differential absorption lidar.
[0053] Here, the reflector 22 of the differential absorption lidar can be a 45-degree reflector, and the hollow space of the angle disk 12 accommodates the reflector 22. The hollow space does not interfere with the structure of the reflector 22, nor does it affect the emission of the light path.
[0054] In this embodiment, the correction system 20 of the differential absorption lidar also includes a telescope for the differential absorption lidar. Figure 4 (Not shown). The telescope of a lidar system may include a primary mirror and a secondary mirror.
[0055] Preferably, the diameter of the hollow space of the dividing disk 12 can be adapted to the structure of the reflecting mirror 22 so that the dividing disk 12 can not interfere with the structure of the reflecting mirror 22 and can better shield the main mirror of the telescope.
[0056] Preferably, the differential absorption lidar can be an ozone lidar with emission wavelengths of 266 nm, 289 nm, and 316 nm. The telescope of the differential absorption lidar is of the Cassegrain type, consisting of a primary mirror and a secondary mirror. The optical echo signal first reaches the primary mirror, and then is captured by the photodetector under the combined reflection and focusing effect of the primary and secondary mirrors.
[0057] like Figure 4 As shown, in this embodiment, the differential absorption lidar calibration device 10 is mounted on the differential absorption lidar to form a differential absorption lidar calibration system 20.
[0058] like Figure 4 As shown, in this embodiment, the groove 112 is arranged on the inner side 113 of the annular structure, and the groove 112 is circular. The diameter of the angle plate 12 is adapted to the diameter of the inner groove 112 ring of the fixed bracket, thus playing a supporting role.
[0059] In this embodiment, as Figure 4 As shown, the support surface 111 is also provided with a reference mark 114, which is arranged circumferentially around the outer periphery of the groove 112.
[0060] Preferably, there are multiple reference marks 114, and the interval angle between each pair of adjacent reference marks 114 is configured as a preset first angle.
[0061] For example, the preset first angle can be 5 degrees. Alternatively, the preset first angle can be the same as the opening angle of the receiving notch.
[0062] In this embodiment, the shape of the ring-shaped fixing bracket 11 may include either a circle or a regular polygon.
[0063] In this embodiment, as Figure 4 As shown, the support surface 111 is also provided with a plurality of through holes 115, and the fixed bracket 11 is detachably connected to the mounting bracket 21 of the differential absorption lidar through the plurality of through holes 115.
[0064] like Figure 4 As shown, preferably, when the ring-shaped fixing bracket 11 is a regular octagon, the number of through holes 115 is 8. The through holes 115 can be set in the top corner area, or the through holes 115 can be not set in the top corner area.
[0065] Here, the through hole 115 can be used for inserting or removing bolt studs. The fixing bracket 11 can be screwed to the mounting bracket 21 of the differential absorption lidar through multiple through holes 115.
[0066] In this embodiment, as Figure 4 As shown, the receiving notch 122 of the angle disc 12 is used for the passage of the correction signal, and the opening angle of the receiving notch 122 is configured as a preset second angle. Here, the correction signal can be an optical echo signal used for correction.
[0067] Specifically, the preset second angle can be determined based on the calibration test time and the detection distance. Preferably, the value of the preset second angle can be 20 degrees.
[0068] In this way, the rotatable angle disk 12 with the receiving notch 122 can independently retain different working angle ranges of the telescope 22.
[0069] It is understandable that in the differential absorption lidar calibration system of this embodiment, based on the calibration objective of the differential absorption lidar calibration device, it needs to selectively retain the effective receiving area of the differential absorption lidar telescope at a certain angle. For example... Figure 4 As shown, 10 degrees was selected as an angular interval, i.e., the receiving area. Here, as... Figure 1 and Figure 4As shown, the correction device of the differential absorption lidar mainly consists of two parts: a fixed bracket and a secant disk. The fixed bracket is a concave annular structure with through holes on the outside for fixing it to the structure of the differential absorption lidar. The concave structure inside the fixed bracket supports the secant disk and allows it to rotate, thus independently maintaining different working angle ranges of the telescope. The secant disk is a non-closed annular structure with a 10-degree opening. Its outer diameter matches the size of the concave annular structure of the fixed bracket, providing support. The aperture of the internal hollow space matches the reflector structure of the differential absorption lidar, preventing interference and effectively shielding the telescope's primary mirror. Reference marks are made on the fixed bracket. Based on the relative relationship between the reference marks and the receiving notch, multiple corresponding angle ranges for receiving correction signals are determined. A rotating handle is fixed on the secant disk for easy rotation.
[0070] Based on the above structure, the differential absorption lidar calibration system in this embodiment includes a mounting frame for the differential absorption lidar, a reflector for the differential absorption lidar, and a calibration device for the differential absorption lidar having a fixed bracket connected to the mounting frame for the differential absorption lidar and a rotatable angle disk. The angle disk is arranged in the groove of the fixed bracket. By changing the position of the receiving notch of the angle disk, the receiving area of the calibration signal can be changed, and signals for calibration from multiple different angle areas can be obtained, thereby ensuring effective calibration of the differential absorption lidar after maintenance.
[0071] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of the present utility model, such as combinations, divisions or repetitions of features, should be included within the scope of protection of this utility model.
Claims
1. A calibration device for a differential absorption lidar, characterized in that, Includes a fixed bracket and a dividing plate; The fixing bracket is configured as a ring structure, and the fixing bracket includes a support surface, the support surface being provided with a groove; The angle-dividing disk is rotatably arranged in the groove. The angle-dividing disk is configured as a non-closed annular structure with a hollow space and a receiving notch in the radial direction. The fixed bracket is used to connect with the mounting bracket of the differential absorption lidar, and the angle plate is used to change the receiving area of the correction signal.
2. The correction device for differential absorption lidar as described in claim 1, characterized in that, The groove is arranged on the inner side of the annular structure, and the groove is circular.
3. The correction device for differential absorption lidar as described in claim 1, characterized in that, The support surface is also provided with reference marks, which are arranged circumferentially around the outer periphery of the groove.
4. The correction device for differential absorption lidar as described in claim 3, characterized in that, The number of reference markers is multiple, and the interval angle between each pair of adjacent reference markers is configured as a preset first angle.
5. The correction device for differential absorption lidar as described in claim 1, characterized in that, The ring structure includes either a circle or a regular polygon.
6. The correction device for differential absorption lidar as described in claim 1, characterized in that, The support surface is also provided with multiple through holes, and the fixed bracket is detachably connected to the mounting bracket of the differential absorption lidar through the multiple through holes.
7. The correction device for differential absorption lidar as described in claim 1, characterized in that, The receiving notch is used for the passage of the correction signal, and the opening angle of the receiving notch is configured as a preset second angle.
8. The correction device for differential absorption lidar as described in claim 1, characterized in that, The upper side of the angle disc is provided with multiple handles evenly arranged circumferentially.
9. The correction device for differential absorption lidar as described in claim 1, characterized in that, The diameter of the hollow space is matched with the structure of the reflector of the differential absorption lidar.
10. A correction system for a differential absorption lidar, characterized in that, The differential absorption lidar calibration system includes a differential absorption lidar mounting bracket, a differential absorption lidar reflector, and a differential absorption lidar calibration device as described in any one of claims 1 to 9. The fixed bracket is connected to the mounting frame of the differential absorption lidar; The hollow space of the angle disk accommodates the reflector of the differential absorption lidar.