A laser power detection device, a regulating system and a laser power regulating method

Abstract

The application belongs to the technical field of laser processing and relates to a laser power detection device, a regulating system and a laser power regulating method.The laser power detection device comprises a base, a light splitting piece and a laser power sensor.The base is provided with a containing cavity, a light inlet, a first light outlet channel and a second light outlet channel, and the light inlet is used for allowing laser to enter;the light splitting piece is located in the containing cavity and is used for dividing the laser entering from the light inlet into first laser emitted along the first light outlet channel and second laser emitted along the second light outlet channel;and the laser power sensor is located in the second light outlet channel and is used for detecting the power of the second laser.When laser enters the containing cavity, it will be divided into the first laser and the second laser by the light splitting piece.The first laser can continue to be used for laser processing, and the second laser is used as a detection source of the laser power sensor.Therefore, the laser power detection device of the application can detect the power of laser while laser processing is performed.

Description

Technical Field

[0001] This application relates to the field of laser processing technology, and more specifically, to a laser power detection device, a laser power adjustment system, and a laser power adjustment method. Background Technology

[0002] During laser processing, the actual power of the laser needs to be equal to the pre-set target power to ensure that the energy fluctuation of the laser during processing is within a certain range, thereby ensuring the accuracy and yield of laser-processed products. Therefore, it is necessary to detect the power of the laser.

[0003] Existing technologies primarily employ laser power meters to detect laser power. This detection method requires repeatedly turning the laser on and off after switching power levels. Through multiple cycles of switching, the laser's light energy is converted into heat, which is then converted into an electrical signal and output to a computer to determine the laser's power. This detection method is time-consuming due to the need for frequent switching when detecting medium- and high-power lasers. Furthermore, this method requires complete laser reception during detection, making simultaneous laser processing impossible.

[0004] In summary, existing laser power testing equipment cannot complete laser power testing during processing, and the testing time is relatively long. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of this application is that the existing laser power detection equipment cannot complete laser power detection during processing, and the detection time is long.

[0006] To solve the above-mentioned technical problems, the embodiments of this application adopt the following solutions:

[0007] A laser power detection device, the laser power detection device comprising:

[0008] The base is provided with a receiving cavity, a light inlet, a first light outlet channel and a second light outlet channel. The light inlet, the first light outlet channel and the second light outlet channel are all connected to the receiving cavity at one end and to the external environment at the other end. The light inlet is used to allow laser light to enter.

[0009] A beam splitter, located in the receiving cavity, is used to split the laser entering from the light inlet into a first laser emitted along the first light outlet channel and a second laser emitted along the second light outlet channel.

[0010] A laser power sensor is located at the end of the second light output channel away from the receiving cavity, and is used to detect the power of the second laser.

[0011] Furthermore, the laser power detection device also includes a first lens and a second lens. The first lens includes a first convex surface and a first flat surface disposed opposite to each other, and the second lens includes a second convex surface and a second flat surface disposed opposite to each other. Both the first lens and the second lens are located in the second light output channel, and the second lens is close to the laser power sensor.

[0012] Wherein, the first convex surface faces the receiving cavity, the second convex surface faces the laser power sensor, the distance from the focal point formed by the first lens through the second laser to the first plane is the first distance, the distance from the focal point to the second convex surface is the second distance, and the first distance is greater than the second distance.

[0013] Furthermore, the laser power detection device also includes a beam homogenizer, which is located between the second lens and the laser power sensor, and is used to disperse and uniformly irradiate the laser emitted from the second lens onto the laser power sensor.

[0014] Furthermore, a shielding part is provided in the second light-emitting channel. The shielding part is located between the second lens and the first lens and is used to shield the second laser. The shielding part is provided with a conical hole that penetrates the shielding part. The cross-sectional area of ​​the conical hole gradually decreases along the direction from the first lens to the second lens, and is used to filter the light at the edge of the second laser.

[0015] Accordingly, this application also provides a laser power adjustment system, the laser power adjustment system comprising:

[0016] A laser emitting module, wherein the laser emitting module is used to emit laser light;

[0017] A laser power detection module is used to split the laser into a first laser and a second laser, detect the power of the second laser, and generate a power signal. The first laser is used for laser processing.

[0018] A control module is configured to generate control commands based on the power signal and transmit the control commands to the laser emitting module to adjust the power of the laser.

[0019] The laser power detection module includes any of the laser power detection devices described in the above embodiments.

[0020] Accordingly, this application provides a laser power adjustment method, the laser power adjustment method comprising:

[0021] The laser is split into a first laser and a second laser;

[0022] Obtain the actual power value, preset target power value, upper compensation limit value, and lower compensation limit value of the second laser;

[0023] The power difference is obtained based on the actual power value and the preset target power value;

[0024] The power difference is compared with the upper compensation limit and the lower compensation limit respectively to obtain control commands;

[0025] The power of the laser is adjusted according to the control command.

[0026] Furthermore, the specific steps for obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser include:

[0027] Obtain the power ratio between the first laser and the second laser;

[0028] Receive the second laser beam, multiply the power of the second laser beam by the power ratio to obtain the actual power value; and / or,

[0029] The compensation upper limit is the preset target power multiplied by a first proportional coefficient, where the first proportional coefficient ranges from 1 to 1.05; and / or,

[0030] The upper limit of the compensation is the preset target power multiplied by a first proportional coefficient, the first proportional coefficient being in the range of 0.95 to 1.

[0031] Further, the steps of comparing the power difference with the upper compensation limit and the lower compensation limit to obtain the control command, and adjusting the power of the laser according to the control command, specifically include:

[0032] Determine whether the power difference is greater than the compensation upper limit. If so, output a first control command as the control instruction; according to the first control command, reduce the power of the laser until the power difference is less than or equal to the compensation upper limit; and / or,

[0033] Determine whether the power difference is less than the compensation lower limit. If so, output the second control instruction as the control instruction. According to the second control instruction, increase the power of the laser until the power difference is greater than or equal to the compensation lower limit.

[0034] Furthermore, the step of obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser also includes:

[0035] The alarm upper limit and alarm lower limit are preset, wherein the alarm upper limit is greater than the compensation upper limit and the alarm lower limit is less than the compensation lower limit;

[0036] The laser power adjustment method further includes the following steps:

[0037] Determine whether the power difference is greater than the compensation upper limit. If so, continue to determine whether the power difference is greater than the alarm upper limit. If so, trigger the first alarm signal.

[0038] Determine whether the power difference is less than the compensation upper limit. If so, continue to determine whether the power difference is less than the alarm lower limit. If so, trigger the second alarm signal.

[0039] Furthermore, the laser is configured with a maximum power.

[0040] The steps of obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser specifically include:

[0041] Set the correction power percentage, which is 1% to 100%;

[0042] The preset target power value is obtained by multiplying the maximum power value by the corrected power percentage.

[0043] Compared with the prior art, the embodiments of this application have the following main advantages:

[0044] When the laser enters the receiving cavity through the light inlet, it is split by the beam splitter into a first laser beam that travels towards the external environment through the first light exit channel and a second laser beam that travels along the second light exit channel to the laser power sensor. At this time, the first laser beam can continue to be used for laser processing, while the second laser beam serves as the detection source for the laser power sensor. Therefore, the laser power detection device of this application embodiment can detect the laser power while performing laser processing. Furthermore, when detecting the laser, the energy of the second laser beam, being a component of the laser beam, is relatively small. Therefore, when the laser power changes, there is no need to re-interrupt the laser power detection. Thus, the laser power detection device of this application embodiment has a short detection time and high efficiency. Attached Figure Description

[0045] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of the laser power detection device according to an embodiment of this application;

[0047] Figure 2 This is another structural schematic diagram of the laser power detection device according to an embodiment of this application;

[0048] Figure 3 This is a cross-sectional schematic diagram of the laser power detection device according to an embodiment of this application;

[0049] Figure 4 A schematic diagram of the laser power adjustment system according to an embodiment of this application;

[0050] Figure 5 This is a flowchart of a laser power adjustment method according to an embodiment of this application.

[0051] Figure label:

[0052] Laser power detection device 10, focal point 20, laser 30, first laser 31, second laser 32, laser emission module 41, laser power detection module 42, control module 43, base 100, first light output channel 101, second light output channel 102, light inlet 103, first base 110, second base 120, shielding part 121, conical hole 122, beam splitter 200, laser power sensor 300, first lens 400, second lens 500, beam homogenizer 600. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0054] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the orientation shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0055] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0056] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0057] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0058] Please refer to Figures 1 to 3 This application provides a laser power detection device 10, which includes:

[0059] The base 100 is provided with a receiving cavity (not marked in the figure), a light inlet 103, a first light outlet channel 101 and a second light outlet channel 102. The light inlet 103, the first light outlet channel 101 and the second light outlet channel 102 are all connected to the receiving cavity at one end and to the external environment at the other end. The light inlet 103 is used to allow the laser 30 to enter.

[0060] Beam splitter 200, located in the receiving cavity, is used to split the laser 30 entering from the light inlet 103 into a first laser 31 emitted along the first light outlet channel 101 and a second laser 32 emitted along the second light outlet channel 102.

[0061] A laser power sensor 300 is located at the end of the second light output channel 102 away from the receiving cavity, and is used to detect the power of the second laser 32.

[0062] In this embodiment, the laser power sensor 300 can only withstand weak laser light and cannot directly withstand medium or high-power laser light used for laser processing for extended periods. When the laser 30 enters the receiving cavity through the light inlet 103, it is split by the beam splitter 200 into a first laser 31 that travels towards the external environment through the first light outlet channel 101, and a second laser 32 that travels along the second light outlet channel 102 to the laser power sensor 300. At this time, the first laser 31 can continue to be used for laser processing, while the second laser 32 serves as the detection source for the laser power sensor 300. Therefore, the laser power detection device 10 of this embodiment can detect the power of the laser 30 while processing it. Furthermore, when detecting the laser 30, the second laser 32, being part of the laser 30, has lower energy and can be adapted to and detected by the laser power sensor 300. Therefore, when the power of the laser 30 changes, there is no need to restart and shut down the laser power detection device 10 to detect the laser 30's power. Thus, the laser power detection device 10 of this embodiment has a short detection time and high efficiency.

[0063] It should be understood that the beam splitter 200 includes at least one of a beam-splitting polarizer, a beam-splitting prism, and a dichroic mirror. The power ratio of the second laser 32 to the laser 30 can be 0.01% to 0.5%, preferably 0.2%. The laser power sensor 300 can convert the energy of the second laser 32 into at least one of voltage, current, and resistance, and then determine the power of the second laser 32 based on the changes in voltage, current, and resistance. After confirming the power ratio of the second laser 32 and the laser 30 based on the selection of the beam splitter 200, the power of the laser 30 and the first laser 31 can be obtained.

[0064] Further, please refer to Figures 1 to 3 The laser power detection device 10 also includes a first lens 400 and a second lens 500. The first lens 400 includes a first convex surface and a first flat surface that are disposed opposite to each other. The second lens 500 includes a second convex surface and a second flat surface that are disposed opposite to each other. Both the first lens 400 and the second lens 500 are located in the second light output channel 102, and the second lens 500 is close to the laser power sensor 300.

[0065] The first convex surface faces the receiving cavity, the second convex surface faces the laser power sensor 300, the distance from the focal point 20 formed by the second laser 32 passing through the first lens 400 to the first plane is the first distance, the distance from the focal point 20 to the second convex surface is the second distance, and the first distance is greater than the second distance.

[0066] In this embodiment, the second laser 32 split by the beam splitter 200 is relatively dispersed and uneven. Therefore, when it directly irradiates the laser power sensor 300, the value detected by the laser power sensor 300 may fluctuate, that is, the detection accuracy is low.

[0067] In the laser power detection device 10 of this embodiment, since the first distance is greater than the second distance, the irradiation range of the second laser 32 emitted from the first plane is greater than the irradiation range when the second laser 32 enters the second convex surface. That is, a Kepler beam-contraction system is formed between the first lens 400 and the second lens 500, thereby reducing the irradiation range of the second laser 32, reducing its dispersion, and thus effectively improving the detection accuracy of the laser power sensor 300.

[0068] It should be understood that, please refer to Figures 1 to 3 The axis of the first lens 400, the second lens 500, and the laser power detection device 10 (along...) Figure 3 The Z-direction (as shown in the figure) can be at a certain distance from the second laser 32 emitted from the self-splitter 200. For example, there is a certain gap between the center of the receiving cavity and the central axis of the second light-emitting channel 102. In this case, the laser 30 received by the laser power sensor 300 is not the central part (high-power part) of the second laser 32, but the part relatively close to the edge (low-power part), thus effectively reducing the power of the second laser 32 received by the laser power detection device 10. The base 100 may include a first base 110 and a second base 120, and the connecting surface between the first base 110 and the second base 120 is the inclined surface shown in convex 3. In this case, by changing the contact area of ​​the inclined surface between the first base 110 and the second base 120, that is, by moving the first base 110 and the second base 120 relative to each other along the X-axis in the figure, the distance between the axis of the first lens 400, the second lens 500 and the laser power detection device 10 and the second laser 32 emitted from the self-splitter 200 can be changed.

[0069] Further, please refer to Figures 1 to 3 The laser power detection device 10 also includes a light homogenizer 600, which is located between the second lens 500 and the laser power sensor 300, and is used to disperse and uniformly irradiate the second laser 32 emitted from the second lens 500 onto the laser power sensor 300.

[0070] In this embodiment, the beam homogenizer 600 enables the second laser 32 to be dispersed and uniformly irradiated onto the laser power sensor 300. Even if the laser 30 entering the light inlet 103 is deflected, the power value of the second laser 32 received by the laser power sensor 300 remains unchanged, thus improving the detection accuracy of the laser power sensor 300.

[0071] It should be understood that the homogenizing element 600 includes at least one of a lens containing a microstructure, an integrating sphere, and a homogenizing rod. An attenuator may also be added between the homogenizing element 600 and the second lens 500, thereby further reducing the power of the second laser 32 received by the laser power sensor 300.

[0072] Further, please refer to Figures 1 to 3 A shielding part 121 is provided in the second light-emitting channel 102. The shielding part 121 is located between the second lens 500 and the first lens 400 and is used to shield the second laser 32. The shielding part 121 is provided with a conical hole 122, which penetrates the shielding part 121. The cross-sectional area of ​​the conical hole 122 gradually decreases along the direction from the first lens 400 to the second lens 500, and is used to filter the light from the edge of the second laser 32.

[0073] In this embodiment, the tapered aperture 122 allows only a portion of the second laser 32 (the portion near the center of the irradiation range) to pass through, thereby using the shielding portion 121 to filter out some of the useless light at the edge of the second laser 32's irradiation range, and avoids interference from scattering light to the laser power sensor 300.

[0074] Accordingly, please refer to Figure 4 This application also provides a laser power adjustment system, which includes:

[0075] Laser emitting module 41, laser emitting module 41 is used to emit laser 30;

[0076] The laser power detection module 42 is used to divide the laser 30 into a first laser 31 and a second laser 32, and to detect the power of the second laser 32 and generate a power signal. The first laser 31 is used for laser 30 processing.

[0077] The control module 43 is used to generate control commands based on the power signal and send the control commands to the laser emitting module 41 to adjust the power of the laser 30.

[0078] The laser power detection module 42 includes any one of the laser power detection devices 10 in the above embodiments.

[0079] In this embodiment, the laser 30 emitted by the laser emitting module 41 to the laser power detection module 42 can be split into a first laser 31 and a second laser 32. Therefore, the power of the laser 30 can be effectively reduced for detection by the laser power sensor 300 in the laser power detection device 10, while simultaneously processing of the product is completed through the first laser 31. The laser power sensor 300 can convert the detected power of the second laser 32 into a power signal. The control module 43 can adjust the power of the laser 30 according to control commands, thereby changing the power of the first laser 31, achieving real-time detection and control of the laser power during laser processing.

[0080] It should be understood that the power signal includes at least one of voltage, current, and resistance. The control module 43 may include a welding control card and a host computer. The welding control card can be connected to the laser power sensor 300 to receive the power signal from the laser power sensor 300 and convert the power signal into information that can be processed by the host computer (computer, etc.). The host computer can determine, based on the power signal, whether it is necessary to increase or decrease the power of the laser 30 emitted by the current laser emitting module 41, thereby controlling the welding control card to manipulate the size of the first laser 31 to achieve a preset power value.

[0081] Accordingly, please refer to Figure 5 This application provides a laser power adjustment method, which includes:

[0082] S100 splits the laser into a first laser and a second laser;

[0083] S200, acquire the actual power value of the second laser, the preset target power value, the upper compensation limit value, and the lower compensation limit value;

[0084] S300 calculates the power difference based on the actual power value and the preset target power value;

[0085] S400 compares the power difference with the upper and lower compensation limits respectively to obtain control commands;

[0086] S500 adjusts the laser power according to control commands.

[0087] In this embodiment, firstly, the laser is split into a first laser and a second laser. Therefore, the first laser can be used for laser welding, and the detection of the second laser does not affect the processing of the first laser. Thus, the laser power adjustment method of this embodiment can detect the laser power in real time. Secondly, since the second laser is split from the first laser, its power is lower and can be detected by laser energy detection structures such as laser power sensors.

[0088] It should be understood that the upper and lower compensation limits can be percentages and / or fixed values. When the upper and lower compensation limits are fixed, the power difference can also be fixed. In this case, if the power difference is greater than the upper compensation limit, the laser power is reduced via control commands. If the power difference is less than the lower compensation limit, the laser power is increased via control commands. When it is determined that the power difference is less than the upper compensation limit, the power difference should continue to be compared with the lower compensation limit.

[0089] Further, please refer to Figure 4 The specific steps for obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser include:

[0090] Obtain the power ratio of the first laser and the second laser;

[0091] Receive the second laser beam, multiply the power of the second laser beam by the power ratio to obtain the actual power value; and / or,

[0092] The compensation upper limit is a preset target power multiplied by a first proportional coefficient, where the first proportional coefficient ranges from 1 to 1.05; and / or,

[0093] The upper limit of compensation is the preset target power multiplied by the first proportional coefficient, which ranges from 0.95 to 1.

[0094] In this embodiment, the power of the second laser is much smaller than that of the first laser, therefore it cannot be equated to the actual power value of the first laser. To calculate the actual power value of the first laser, the power of the second laser needs to be multiplied by the power ratio of the first laser to the second laser. Since the first laser processes the product, its actual power value can also be directly calculated using the power ratio of the first laser to the second laser.

[0095] The power ratio of the first laser and the second laser can be obtained by directly consulting the parameters of the device that splits the laser into the first laser and the second laser. For example, when the laser is split into the first laser and the second laser by a beam-splitting polarizer, the transmittance and extinction ratio of the beam-splitting polarizer can be directly consulted to obtain the power ratio of the second laser and the first laser.

[0096] When the first proportional coefficient is in the range of 1 to 1.05, it can effectively avoid the upper limit of compensation being too large, thus failing to calibrate the laser size, and thereby ensuring that the power of the first laser processing is within the preset range. When the second proportional coefficient is in the range of 0.95 to 1, it can effectively avoid the lower limit of compensation being too large, thus failing to calibrate the laser size, and thereby ensuring that the power of the first laser processing is within the preset range.

[0097] Further, please refer to Figure 5 The steps of comparing the power difference with the upper and lower compensation limits to obtain the control command, and adjusting the laser power according to the control command, are as follows:

[0098] Determine if the power difference is greater than the compensation upper limit. If so, output a first control command as the control instruction; according to the first control command, reduce the laser power until the power difference is less than or equal to the compensation upper limit; and / or,

[0099] Determine whether the power difference is less than the compensation lower limit. If so, output a second control command as the control command. According to the second control command, increase the power of the laser until the power difference is greater than or equal to the compensation lower limit.

[0100] In this embodiment, the difference between the power difference and the upper and lower compensation limits can be used to determine whether to output a first command or a second command, thereby controlling the laser magnitude. It should be understood that the difference between the power difference and the upper compensation limit can be determined first, or the difference between the power difference and the lower compensation limit can be determined first, followed by the upper compensation limit.

[0101] Further, please refer to Figure 5 The steps for obtaining the actual power value, preset target power value, upper compensation limit value, and lower compensation limit value of the second laser also include:

[0102] The alarm upper limit and alarm lower limit are preset. The alarm upper limit is greater than the compensation upper limit, and the alarm lower limit is less than the compensation lower limit.

[0103] The steps of the laser power adjustment method also include:

[0104] Determine if the power difference is greater than the compensation limit. If so, continue to determine if the power difference is greater than the alarm limit. If so, trigger the first alarm signal.

[0105] Determine if the power difference is less than the upper limit of compensation. If so, continue to determine if the power difference is less than the lower limit of alarm. If so, trigger the second alarm signal.

[0106] In this embodiment, the upper and lower alarm limits can promptly remind laser processing operators to inspect the laser-processed products and adjust the laser power in a timely manner to avoid defective products.

[0107] It should be understood that the first alarm signal and the second alarm signal can be at least one of the following: sound signal, light signal, or text signal.

[0108] Further, please refer to Figure 5 The laser has a maximum power setting;

[0109] The specific steps for obtaining the actual power value, preset target power value, upper compensation limit, and lower compensation limit of the second laser include:

[0110] Set the correction power percentage, which can be 1% to 100%.

[0111] Multiply the maximum power value by the correction power percentage to obtain the preset target power value.

[0112] In this embodiment, the laser has a maximum power and a minimum power. Before processing with the laser, a preset target power value can be obtained by setting a correction power percentage. For example, when the maximum power is 6000W, ten correction power percentages can be set: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%. When it is necessary to control the preset target power of the laser, the corresponding correction power percentage can be directly selected without selecting a specific preset target power value. At this time, with the compensation upper limit and compensation lower limit being the first and second proportional coefficients, there is no need to perform further unit conversion on the power difference. Instead, by comparing the percentage difference between the power difference, the compensation upper limit, and the compensation lower limit, it can be directly determined whether the laser size needs to be increased or decreased. It should be understood that the correction power percentage can be set to data such as 11.1% or 11.11%, and its accuracy can be adjusted according to actual needs.

[0113] For further details, please refer to... Figure 5 The laser can be single-mode or dual-mode (lasers with inner and outer rings). When the laser is single-mode, the preset target power can be obtained by using ten percentage points (10% to 100%, spaced 10%) as correction power percentages. However, dual-mode lasers require multiple corrections to obtain the preset target power corresponding to the correction power percentages. This is because when both the inner and outer rings of a dual-mode laser are 3000W lasers, in the first case, the inner ring outputs laser light at 50% correction power percentage and the outer ring at 100% correction power percentage; in the second case, the inner ring outputs laser light at 100% correction power percentage and the outer ring at 50% correction power percentage. Because the light from the inner and outer rings interacts after combination, the total power of the dual-mode laser cannot be calculated by simply superimposing the inner and outer rings. For example, in the first case, the formula for calculating the output power of the dual-mode laser is not 3000W x 50% + 3000W x 100% = 4500W, but may be 4000W. In the second case, the output power of the dual-mode laser is also not 3000W x 100% + 3000W x 50% = 4500W, but may reach 5000W.

[0114] Therefore, when setting the correction power percentage for a dual-mode laser, it is necessary to calculate the correspondence between each correction power percentage of the inner ring and the multiple correction power percentages of the outer ring. Specifically, for example, if the preset target power of the dual-mode laser is calculated using ten percentages from 10% to 100%, then the inner ring correction power percentage needs to be set to 10%, and the outer ring to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% for corresponding calculations. This will yield ten preset target powers. In summary, when the preset target power of the dual-mode laser is set to ten correction power percentages (10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%), there are a total of 100 preset target power sets.

[0115] For further details, please refer to... Figure 5 In this embodiment, since the host computer, welding control card, computer, and other devices cannot directly obtain the actual power value of the second laser, it is usually necessary to convert the actual power value of the second laser into other information when detecting its power. Therefore, this embodiment needs to convert the actual power value into information such as voltage, current, or resistance, and then convert this information into the corresponding laser power in the aforementioned devices. When detecting the actual power of the second laser, the laser power sensor used, after being connected to the external circuit, itself has certain initial values ​​of voltage, current, and resistance.

[0116] To address the impact of initial values ​​on the actual power of the second laser, the initial voltage, initial current, and initial resistance of the laser power sensor can be measured using a multimeter or similar device before detecting the actual power of the second laser. These initial values ​​can then be subtracted from the voltage, current, and resistance calculated from the measured second laser power, thus preventing interference with the laser detection results.

[0117] Further reference Figure 5 In the method of this embodiment, a collection interval can also be set. The collection interval is the interval frequency at which the laser power sensor actively acquires the actual power of the second laser, thereby improving the timeliness of laser power detection as needed.

[0118] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application 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 specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

[0119] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, combinations, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A laser power detection device, characterized in that, The laser power detection device includes: The base is provided with a receiving cavity, a light inlet, a first light outlet channel and a second light outlet channel. The light inlet, the first light outlet channel and the second light outlet channel are all connected to the receiving cavity at one end and to the external environment at the other end. The light inlet is used to allow laser light to enter. A beam splitter, located in the receiving cavity, is used to split the laser entering from the light inlet into a first laser emitted along the first light outlet channel and a second laser emitted along the second light outlet channel. A laser power sensor is located at the end of the second light output channel away from the receiving cavity, and is used to detect the power of the second laser. The laser power detection device further includes a first lens and a second lens. The first lens includes a first convex surface and a first flat surface disposed opposite to each other. The second lens includes a second convex surface and a second flat surface disposed opposite to each other. Both the first lens and the second lens are located in the second light output channel, and the second lens is close to the laser power sensor. The first convex surface faces the receiving cavity, the second convex surface faces the laser power sensor, the distance from the focal point formed by the first lens to the first plane is the first distance, and the distance from the focal point to the second convex surface is the second distance. The first distance is greater than the second distance. The base includes a first base and a second base, and the connecting surface between the first base and the second base is an inclined surface; By moving the first base and the second base relative to each other along the X-axis, the distance between the axis of the first lens, the second lens, and the laser power detection device and the second laser emitted from the beam splitter can be changed.

2. The laser power detection device according to claim 1, characterized in that, The laser power detection device further includes a beam homogenizer, which is located between the second lens and the laser power sensor, and is used to disperse and uniformly irradiate the laser power sensor with the second laser emitted from the second lens.

3. The laser power detection device according to claim 1 or 2, characterized in that, A shielding part is provided in the second light output channel. The shielding part is located between the second lens and the first lens and is used to shield the second laser. The shielding part is provided with a conical hole that penetrates the shielding part. The cross-sectional area of ​​the conical hole gradually decreases along the direction from the first lens to the second lens, so as to filter the light at the edge of the second laser.

4. A laser power adjustment system, characterized in that, The laser power adjustment system includes: A laser emitting module, wherein the laser emitting module is used to emit laser light; A laser power detection module is used to split the laser into a first laser and a second laser, detect the power of the second laser, and generate a power signal. The first laser is used for laser processing. A control module is configured to generate control commands based on the power signal and transmit the control commands to the laser emitting module to adjust the power of the laser. The laser power detection module includes the laser power detection device described in any one of claims 1 to 3.

5. A laser power adjustment method, characterized in that, The laser power adjustment method is applied to the laser power adjustment system as described in claim 4, wherein the laser power adjustment method includes: The laser is split into a first laser and a second laser; Obtain the actual power value, preset target power value, upper compensation limit value, and lower compensation limit value of the second laser; The power difference is obtained based on the actual power value and the preset target power value; The power difference is compared with the upper compensation limit and the lower compensation limit respectively to obtain control commands; The power of the laser is adjusted according to the control command.

6. The laser power adjustment method according to claim 5, characterized in that, The specific steps for obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser include: Obtain the power ratio of the first laser and the second laser; receive the second laser, multiply the power of the second laser by the power ratio to obtain the actual power value; and / or, The compensation upper limit is the preset target power multiplied by a first proportional coefficient, where the first proportional coefficient ranges from 1 to 1.05; and / or, The upper limit of the compensation is the preset target power multiplied by a first proportional coefficient, the first proportional coefficient being in the range of 0.95 to 1.

7. The laser power adjustment method according to claim 5, characterized in that, The step of comparing the power difference with the upper compensation limit and the lower compensation limit respectively to obtain a control command, and adjusting the power of the laser according to the control command, specifically includes: Determine whether the power difference is greater than the compensation upper limit. If so, output a first control command as the control instruction; according to the first control command, reduce the power of the laser until the power difference is less than or equal to the compensation upper limit; and / or, Determine whether the power difference is less than the compensation lower limit; if so, output a second control command as the control command. According to the second control command, the power of the laser is increased until the power difference is greater than or equal to the compensation lower limit.

8. The laser power adjustment method according to claim 5, characterized in that, The step of obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser further includes: The alarm upper limit and alarm lower limit are preset, wherein the alarm upper limit is greater than the compensation upper limit and the alarm lower limit is less than the compensation lower limit; The laser power adjustment method further includes the following steps: Determine whether the power difference is greater than the compensation upper limit. If so, continue to determine whether the power difference is greater than the alarm upper limit. If so, trigger the first alarm signal. Determine whether the power difference is less than the compensation upper limit. If so, continue to determine whether the power difference is less than the alarm lower limit. If so, trigger the second alarm signal.

9. The laser power adjustment method according to any one of claims 5 to 8, characterized in that, The laser is set with a maximum power. The steps of obtaining the actual power value, preset target power value, compensation upper limit value, and compensation lower limit value of the second laser specifically include: Set the correction power percentage, which is 1% to 100%; The preset target power value is obtained by multiplying the maximum power value by the corrected power percentage.

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