Method, system and device for adjusting lap joint position of laser spot

Abstract

The invention relates to the technical field of laser design, and discloses a laser spot lap joint position adjusting method, system and device. The method comprises the following steps: firstly, reading a laser parameter and a light path configuration parameter, calculating a cleaning width compensation value and a switch light delay parameter, and outputting the switch light delay parameter to a laser to adjust a light spot position; adjusting based on the optimal lap joint rate, reading information such as laser frequency to calculate optimal galvanometer frequency and cleaning speed, and accordingly controlling a galvanometer motor and a mobile platform to realize lap joint of light spots in vibration and cleaning directions. Parameters such as focusing spot diameter are calculated according to light path configuration information, and galvanometer frequency, switch light delay parameters and the like are obtained by combining pulse width, laser frequency and the like. Compared with the prior art, the light spot utilization rate and the cleaning efficiency are improved, the light spot lap joint position adjusting process is simplified, and the operation difficulty is reduced.

Description

Technical Field

[0001] This invention belongs to the field of laser design technology and relates to a method, system and device for adjusting the overlapping position of laser beams. Background Technology

[0002] Because the MOPA fiber laser system can amplify the signal strictly according to the seed signal source coupled into the system, it will not change the relevant characteristics of the laser, such as the center wavelength, pulse waveform and pulse width. The parameter adjustment dimension is higher and the range is wider. It is more adaptable to different application scenarios for different materials and has a larger process window range. It can meet the surface cleaning needs of various materials. Therefore, the MOPA laser is currently the most widely used laser for laser cleaning.

[0003] In laser cleaning operations, the overlap rate of the laser spot is one of the important factors affecting the cleaning efficiency. Ideally, the laser spot should cover the entire surface without residue. Conventional circular laser cleaning methods adjust the overlap rate by changing the laser frequency and the spacing between the laser beams, ultimately achieving complete coverage of the cleaning area. However, research has revealed that this adjustment method does not produce an optimal spot distribution. This is because adjacent spots have parallel centers. To achieve proper overlap and coverage, adjacent spots need to overlap more areas, resulting in a smaller effective area for each spot and reduced laser cleaning efficiency. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention proposes a method, system, and device for adjusting the overlapping position of laser spot.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: On one hand, the present invention provides a method for adjusting the overlap position of laser spot, comprising: The cleaning width compensation value is calculated using laser parameters and optical path configuration parameters. and switching optical delay parameters ; Switch optical delay parameters The laser switch delay ultimately causes the two beams of light traveling back and forth to shift horizontally. The distance is used to adjust the position of the light spot; The overlap rate is adjusted based on the optimal laser spot overlap rate, initially set to... ; The optimal galvanometer frequency is calculated by considering the laser frequency, scan linewidth, and optical path configuration. Cleaning speed ; Based on the galvanometer frequency Control the galvanometer according to the cleaning speed The laser cleaning head is moved to achieve overlap of the laser spots in both the vibration and cleaning directions.

[0006] Furthermore, the laser parameters and optical path configuration parameters are read, and the cleaning width compensation value is calculated. and switching optical delay parameters

[0007] Read the optical path configuration, including the laser fiber core diameter. Focal length of collimating lens and focal length of the focusing field lens Including the information, calculate the diameter of the focused spot. Actual effective diameter of the light spot and cleaning width compensation value The specific formula is as follows: ; ; ; Based on pulse width and laser frequency With cleaning width Calculate the galvanometer frequency and switching optical delay parameters The specific formula is as follows: ; ; Switch optical delay parameters By adjusting the laser switching delay during the reciprocating motion of the galvanometer, the two beams of light traveling back and forth are ultimately shifted horizontally. The distance is adjusted to control the position of the light spot.

[0008] Furthermore, the reading laser frequency Calculate the optimal galvanometer frequency based on the scan linewidth and optical path configuration. Cleaning speed The specific method is as follows: The scan linewidth and optical path configuration include the actual effective diameter of the light spot. and cleaning width ; Based on pulse width and laser frequency With cleaning width Calculate the galvanometer frequency ; ; The system calculates the optimal cleaning speed vwash based on the galvanometer frequency and the diameter of the focused spot. ; Based on the galvanometer frequency Control the galvanometer motor according to the cleaning speed The moving platform is controlled to ensure that the light spots overlap in both the vibration and cleaning directions.

[0009] On the other hand, the present invention provides a laser spot overlap position adjustment system, including a laser cleaning head, a laser, a server, and a control screen, which executes the above-mentioned laser spot overlap position adjustment method as follows: By inputting laser parameters and optical path configuration parameters through the control screen, the server calculates the cleaning width compensation value. and switching optical delay parameters The switching optical delay parameters The output is fed to the laser, and the laser switching delay is adjusted during the round trip of the galvanometer, ultimately causing the two beams to shift horizontally. The distance; By controlling the laser frequency input on the screen Based on the scan linewidth and optical path configuration, the server calculates the optimal galvanometer frequency. Cleaning speed galvanometer frequency The galvanometer motor outputs to the galvanometer, and the cleaning speed... Control the movement of the laser cleaning head.

[0010] On the other hand, the present invention provides a laser spot overlap position adjustment device, which, when operating the above-mentioned laser spot overlap position adjustment system, also includes a mobile platform and a control board on which a laser cleaning head is installed, and the laser cleaning head includes a cleaning head shell; The cleaning head housing is equipped with a focusing field lens, a galvanometer, a reflecting mirror, and a collimating mirror. The cleaning head housing is also equipped with a galvanometer motor for adjusting the galvanometer. After being collimated by the collimating lens, the laser beam is directed towards the reflecting mirror. The laser beam reflected by the reflecting mirror is then adjusted by the galvanometer and directed towards the focusing field mirror for output. The control board reads the laser parameters and optical path configuration parameters input from the control screen, and then switches the optical delay parameters. The output is sent to the laser, and the control board reads the laser frequency input from the control screen. The scan linewidth and optical path are configured and transmitted to the server, and the control board sets the galvanometer frequency. The galvanometer motor outputs to the galvanometer and controls the cleaning speed of the circuit board. Control the movement of the laser cleaning head.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The laser circular spot position adjustment method proposed in this invention effectively improves the spot utilization rate and laser cleaning efficiency. The laser spot overlap position precision adjustment system proposed in this invention automatically calculates the spot position adjustment parameters and adjusts the spot overlap position by inputting laser parameters, which greatly simplifies the operation process of spot overlap position adjustment and reduces the operation difficulty. Attached Figure Description

[0012] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a system structure diagram of the present invention; Figure 3 This is a schematic diagram of the system operation of the present invention; Figure 4 This is a structural diagram of the device of the present invention; Figure 5 This is a cross-sectional view of the device structure of the present invention; Figure 6 This is a diagram showing the effect of light spot overlap before the overlap position is adjusted; Figure 7 This is a diagram showing the effect of light spot overlap after adjusting the overlap position.

[0013] The labels in the attached diagram are: 1. Focusing field lens; 2. Cleaning head housing; 3. Collimating lens; 4. Control board; 5. Galvanometer; 6. Reflector; 7. Galvanometer motor. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figures 1-7 As shown, the technical solution adopted in this invention is as follows.

[0016] like Figure 1 As shown, a method for precisely adjusting the overlap position of laser spots includes: The cleaning width compensation value is calculated using laser parameters and optical path configuration parameters. and switching optical delay parameters .

[0017] Switch optical delay parameters The laser switch delay ultimately causes the two beams of light traveling back and forth to shift horizontally. The distance is adjusted to control the position of the light spot.

[0018] The overlap rate is adjusted based on the optimal laser spot overlap rate. In this embodiment, the initial laser spot overlap rate is set to [value missing]. .

[0019] The optimal galvanometer frequency is calculated by considering the laser frequency, scan linewidth, and optical path configuration. Cleaning speed .

[0020] Based on the galvanometer frequency Control the galvanometer according to the cleaning speed The laser cleaning head is moved to achieve overlap of the laser spots in both the vibration and cleaning directions.

[0021] First, it is necessary to rely on the control board 4 to read the laser parameters and optical path configuration parameters, and calculate the cleaning width compensation value and the switching optical delay parameters.

[0022] Read the optical path configuration, including information such as the laser fiber core diameter, collimating lens focal length, and focusing field lens focal length, and calculate the focused spot diameter, the actual effective spot diameter, and the cleaning width compensation value. The specific formula is as follows: ; ; ; Based on pulse width and laser frequency Calculate the mirror frequency f and the switching optical delay parameters based on the cleaning width L. The specific formula is as follows: ; ; Switch optical delay parameters The output is fed to the laser, and the laser switching delay is adjusted during the round trip of the galvanometer, ultimately causing the two beams to shift horizontally. The distance is adjusted to control the laser beam position. Accurate calculation of these parameters clarifies the beam characteristics during focusing and application, as well as the adjustment amount for the cleaning width. Determining the focused beam diameter and the actual effective beam diameter helps understand the distribution of laser energy on the application surface. The cleaning width compensation value provides a crucial basis for subsequent adjustments to the cleaning effect, ensuring that the cleaning work covers the expected area and avoiding omissions or over-cleaning. A suitable galvanometer frequency ensures that the laser can uniformly cover the cleaning area during scanning, while the switching delay parameter ensures that the laser switching time is synchronized with the beam movement during the galvanometer's reciprocating motion, preventing beam overlap or gaps, thereby improving cleaning quality and efficiency.

[0023] The switching delay parameter is output to the laser, and the laser switching delay is adjusted during the galvanometer's reciprocating motion. This ultimately causes the two beams to shift horizontally by a certain distance, thus adjusting the beam position. By adjusting the switching delay, precise control of the beam position is achieved. This operation ensures that the positional relationship of the two beams meets the cleaning requirements during the galvanometer's reciprocating scanning process, preventing beam overlap or deviation from the predetermined cleaning path, thereby guaranteeing the consistency and uniformity of the cleaning effect and improving the cleaning quality.

[0024] The overlap rate is adjusted based on the optimal laser spot overlap rate, initially set at 20%. Setting an appropriate spot overlap rate is crucial to ensuring cleaning effectiveness. An initial overlap rate of 20% can, to a certain extent, ensure full coverage of the cleaning area and avoid cleaning blind spots. Further optimization of the overlap rate through subsequent parameter adjustments can improve cleaning efficiency and reduce energy waste while maintaining cleaning quality.

[0025] The laser frequency, scan linewidth, and optical path configuration are read to calculate the optimal galvanometer frequency and cleaning speed. The scan linewidth and optical path configuration include the actual effective diameter of the laser spot and the cleaning width. Based on the pulse width, laser frequency, and cleaning width, the galvanometer frequency is calculated.

[0026] The scan linewidth and optical path configuration include the actual effective diameter of the light spot. and cleaning width ; Based on pulse width and laser frequency With cleaning width Calculate the galvanometer frequency ; ; The system calculates the optimal cleaning speed vwash based on the galvanometer frequency and the diameter of the focused spot. ; Based on the galvanometer frequency Control the galvanometer motor according to the cleaning speed The moving platform is controlled to ensure that the laser spots overlap in both the vibration and cleaning directions. Based on the actual laser parameters and required cleaning width, the galvanometer frequency is precisely calculated to ensure that the galvanometer's movement matches the laser's emission frequency, enabling the laser to uniformly cover the cleaning area and improving cleaning uniformity and effectiveness.

[0027] On the other hand, such as Figure 2 , Figure 3 As shown, the present invention provides a laser spot overlap position adjustment system, including a laser cleaning head, a laser, a server, and a control screen.

[0028] The above method for adjusting the overlap position of the laser spot is as follows: By inputting laser parameters and optical path configuration parameters through the control screen, the server calculates the cleaning width compensation value. and switching optical delay parameters The switching optical delay parameters The output is fed to the laser, and the laser switching delay is adjusted during the round trip of the galvanometer, ultimately causing the two beams to shift horizontally. The distance.

[0029] By controlling the laser frequency input on the screen Based on the scan linewidth and optical path configuration, the server calculates the optimal galvanometer frequency. Cleaning speed galvanometer frequency The galvanometer motor outputs to the galvanometer, and the cleaning speed... Control the movement of the laser cleaning head.

[0030] On the other hand, such as Figure 4 , Figure 5 As shown, the present invention provides a laser spot overlap position adjustment device, which also includes a movable platform with a laser cleaning head installed and a control board 4. The laser spot overlap position adjustment device operates the aforementioned laser spot overlap position adjustment system.

[0031] The laser cleaning head includes a cleaning head housing 2. The cleaning head housing 2 is equipped with a focusing field lens 1, a galvanometer 5, a reflector 6, and a collimating lens 3. The cleaning head housing 2 is also equipped with a galvanometer motor 7 for adjusting the galvanometer 5.

[0032] After being collimated by collimating lens 3, the laser beam is directed towards reflecting mirror 6. The laser beam reflected by reflecting mirror 6 is then adjusted by galvanometer 5 and directed towards focusing field mirror 1 for output.

[0033] Control board 4 reads the laser parameters and optical path configuration parameters input from the control screen, and then switches the optical delay parameters. The output is sent to the laser, and control board 4 reads the laser frequency input from the control screen. The scan linewidth and optical path are configured and transmitted to the server. The control board 4 then sets the galvanometer frequency. The output to the galvanometer motor controls the cleaning speed of board 4. Control the movement of the laser cleaning head.

[0034] The spot overlap effect before the improvement provided by the present invention is as follows: Figure 6 As shown, the beam overlap effect after improvement by the method provided by this invention is as follows: Figure 7 As shown, it can be clearly seen that the overlap area of ​​the laser spot is reduced, which effectively improves the utilization rate of the spot and improves the efficiency of laser cleaning.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 method for adjusting the overlap position of a laser spot, characterized in that, Including: The cleaning width compensation value is calculated using laser parameters and optical path configuration parameters. and switching optical delay parameters ; Switch optical delay parameters The output is fed to the laser, and the laser switching delay during the round trip of the galvanometer is adjusted to ultimately cause the two beams to shift horizontally. The distance is used to adjust the position of the light spot; The overlap rate is adjusted based on the laser spot overlap rate, which is initially set to... ; The optimal galvanometer frequency is calculated by considering the laser frequency, scan linewidth, and optical path configuration. Cleaning speed ; Based on the galvanometer frequency Control the galvanometer according to the cleaning speed The laser cleaning head is moved to achieve overlap of the laser spots in both the vibration and cleaning directions.

2. The method for adjusting the overlap position of a laser spot according to claim 1, characterized in that, The laser parameters and optical path configuration parameters are read, and the cleaning width compensation value is calculated. and switching optical delay parameters The specific method is as follows: Read the optical path configuration, including the laser fiber core diameter. Focal length of collimating lens and focal length of the focusing field lens Including the information, calculate the diameter of the focused spot. Actual effective diameter of the light spot and cleaning width compensation value The specific formula is as follows: ； ； ； Based on pulse width and laser frequency With cleaning width Calculate the galvanometer frequency and switching optical delay parameters The specific formula is as follows: ； ； Switch optical delay parameters The output is fed to the laser, and the laser switching delay is adjusted during the round trip of the galvanometer, ultimately causing the two beams to shift horizontally. The distance is adjusted to control the position of the light spot.

3. The method for adjusting the overlap position of a laser spot according to claim 2, characterized in that, The reading laser frequency Calculate the optimal galvanometer frequency based on the scan linewidth and optical path configuration. Cleaning speed The specific method is as follows: The scan linewidth and optical path configuration include the actual effective diameter of the light spot. and cleaning width ; Based on pulse width and laser frequency With cleaning width Calculate the galvanometer frequency ; ； The system calculates the optimal cleaning speed vwash based on the galvanometer frequency and the diameter of the focused spot. ； Based on the galvanometer frequency Control the galvanometer motor according to the cleaning speed The moving platform is controlled to ensure that the light spots overlap in both the vibration and cleaning directions.

4. A laser spot overlap position adjustment system, comprising a laser cleaning head, a laser, a server, and a control screen, characterized in that, The laser spot overlap position adjustment method according to claim 1 is specifically as follows: By inputting laser parameters and optical path configuration parameters through the control screen, the server calculates the cleaning width compensation value. and switching optical delay parameters The switching optical delay parameters The output is fed to the laser, and the laser switching delay is adjusted during the round trip of the galvanometer, ultimately causing the two beams to shift horizontally. The distance; By controlling the laser frequency input on the screen Based on the scan linewidth and optical path configuration, the server calculates the optimal galvanometer frequency. Cleaning speed galvanometer frequency The galvanometer motor outputs to the galvanometer, and the cleaning speed... Control the movement of the laser cleaning head.

5. A laser spot overlap position adjustment device, characterized in that, The laser spot overlap position adjustment system according to claim 4 further includes a mobile platform and control board (4) on which a laser cleaning head is installed, and the laser cleaning head includes a cleaning head shell (2). The cleaning head housing (2) is equipped with a focusing field lens (1), a galvanometer (5), a reflector (6), and a collimating lens (3). The cleaning head housing (2) is also equipped with a galvanometer motor (7) for adjusting the galvanometer (5). After being collimated by the collimating lens (3), the laser beam is directed towards the reflecting mirror (6). The laser beam reflected by the reflecting mirror (6) is then adjusted by the galvanometer (5) and directed towards the focusing field mirror (1) and output. The control board (4) reads the laser parameters and optical path configuration parameters input from the control screen, and the control board (4) sets the switch optical delay parameters. The output is sent to the laser, and the control board (4) reads the laser frequency input from the control screen. The scan linewidth and optical path configuration are transmitted to the server, and the control board (4) sets the galvanometer frequency. The output to the galvanometer motor controls the cleaning speed of the control board (4). Control the movement of the laser cleaning head.

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