Automatic laser power adjusting device

Abstract

The utility model relates to a laser power automatic adjusting device, comprising a laser attenuator used for adjusting laser power; the beam splitter is used for separating the incident laser, the part, penetrating through the beam splitter, of the incident laser is transmission light, and the part, reflected by the beam splitter, of the incident laser is reflected light; the power meter is mounted on a light path of the reflected light and is used for measuring a power value of the reflected light; and the controller is used for receiving the power value measured by the power meter and controlling the laser attenuator to carry out power adjustment according to the power value. According to the automatic laser power adjusting device, the light power value of the reflected light path is transmitted to the controller through the power meter, the whole laser power is monitored through the controller, and when the laser power is attenuated, the controller can monitor the attenuation condition in time and make a response, so that the laser power is automatically adjusted. The laser processing power is adjusted by adjusting the position of the laser attenuator, and the consistency of the processing effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of laser processing detection, in particular to an automatic control laser power regulating device. Background Art

[0002] Laser beam power detection in optical-mechanical systems is a key technology that can help ensure the stability and performance of the system. The laser beam power directly affects the effect of laser processing, so accurate control of laser power is very important. In laser power detection, the conventional method is to adjust the laser power through the cutoff of the aperture, the absorption-type attenuation plate or the continuously adjustable attenuation plate. However, these methods cannot achieve automatic adjustment of the laser processing power. The laser power is only adjusted actively when the laser processing effect deteriorates. Not only does it require manual measurement of the laser power, but it also requires manual adjustment of the laser power. Since the energy changes caused by the laser's own power attenuation cannot be adjusted in time, it will greatly affect the processing efficiency and even the processing quality. Utility Model Content

[0003] Based on this, it is necessary to provide a laser power automatic adjustment device to address the above problems, which can not only continuously adjust the laser energy, but also eliminate manual operation steps and improve processing efficiency.

[0004] The utility model provides an improved laser power automatic adjustment device, the device comprising:

[0005] Laser attenuator, used to adjust the laser power;

[0006] A beam splitter is used to separate the incident laser light, wherein the portion of the incident laser light that passes through the beam splitter is the transmitted light, and the portion of the incident laser light that is reflected by the beam splitter is the reflected light;

[0007] A power meter, installed on the optical path of the reflected light, for measuring the power value of the reflected light;

[0008] The controller is used to receive the power value measured by the power meter and control the laser attenuator to adjust the power according to the power value.

[0009] In one embodiment, the ratio of the energy of the transmitted light to the energy of the reflected light is a fixed value.

[0010] In one embodiment, the device further comprises an optical shutter, which is electrically connected to the controller and is used to control the laser to enter the power meter.

[0011] In one embodiment, the light shutter includes a rotating electromagnet and a light blocking plate, the rotating electromagnet drives the light blocking plate to rotate, and the light blocking plate controls the entry of laser light by rotating.

[0012] In one embodiment, the laser attenuator includes a half-wave plate and a polarizing prism, and the combination of the half-wave plate and the polarizing prism changes the power of the transmitted laser beam.

[0013] In one of the embodiments, the laser attenuator further includes a hollow rotating motor, the half-wave plate is mounted on the hollow rotating motor, and the hollow rotating motor is electrically connected to the controller.

[0014] The above-mentioned laser power automatic adjustment device transmits the light power value in the reflected light path to the controller through the power meter, and monitors the power of the entire laser processing through the software program of the controller. When the laser power is attenuated, the controller can timely monitor the attenuation and respond. When the laser power is detected to be attenuated, the controller controls the laser attenuator to move to the required position to achieve automatic adjustment of the laser power. The laser processing system will automatically adjust the power to the target power every time it processes the same object, ensuring the consistency of the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the structure of a laser power automatic adjustment device according to an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of a process flow of a method for automatically adjusting laser power according to an embodiment of the present utility model;

[0018] Figure 3 A schematic diagram of a flow chart of a method for automatically adjusting laser power according to another embodiment of the present utility model;

[0019] Figure 4 A schematic diagram of a flow chart of a method for automatically adjusting laser power according to another embodiment of the present utility model;

[0020] Figure 5 The present invention is a flowchart of a method for automatically adjusting laser power according to another embodiment of the present invention.

[0021] Reference numerals:

[0022] 110. Laser attenuator; 111. Half-wave plate; 112. Polarization prism; 113. Hollow rotating motor; 120. Beam splitter; 130. Power meter; 140. Controller; 150. Optical shutter; 151. Rotating electromagnet; 152. Light baffle. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the utility model are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of the present utility model have the same meaning as those commonly understood by technicians in the technical field of the present utility model. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used in the specification of the present utility model includes any and all combinations of one or more related listed items.

[0028] Combine the following Figure 1-Figure 5 The utility model describes a laser power automatic adjustment device and method.

[0029] like Figure 1 As shown, in one embodiment, a laser power automatic adjustment device includes: a laser attenuator 110, a beam splitter 120, a power meter 130 and a controller 140.

[0030] The laser attenuator 110 is used to adjust the laser power.

[0031] The beam splitter 120 is used to split the incident laser light. The portion of the incident laser light that passes through the beam splitter 120 is the transmitted light, and the portion of the incident laser light that is reflected by the beam splitter 120 is the reflected light.

[0032] The power meter 130 is installed on the optical path of the reflected light to measure the power value of the reflected light. Preferably, the power meter 130 is a photon power meter with a measurement range of 10μw to 3w, low noise and fast response.

[0033] The controller 140 has a built-in software program for receiving the power value measured by the power meter and controlling the laser attenuator 110 to adjust the power according to the power value.

[0034] Specifically, the incident laser enters the device from the laser attenuator 110, and the controller 140 has a built-in software program that can preset the target power. After setting the target power, the controller 140 controls the laser attenuator 110 to adjust the power value of the incident laser. After adjustment, part of the laser beam passes through the beam splitter 120 to become transmitted light for subsequent workpiece processing, and part of the laser beam is reflected by the beam splitter 120 to become reflected light. The reflected light enters the power meter 130 to measure the power value, and the power value is transmitted to the controller 140 for real-time monitoring. When the real-time power value received by the controller 140 deviates from the target power value, it indicates that the laser beam is attenuated at this time. The controller 140 controls the laser attenuator 110 to change the power value of the laser beam to complete the automatic adjustment of the laser power.

[0035] The laser power automatic adjustment device of this embodiment transmits the light power value in the reflected light path to the controller 140 through the power meter 130, and monitors the power of the entire laser processing through the software program of the controller 140. When the laser power is attenuated, the controller 140 can monitor the attenuation in time and control the laser attenuator 110 to adjust the power of the laser beam, eliminating the tedious operation of manually measuring the laser power and realizing automatic control and feedback of the laser power.

[0036] In this embodiment, the ratio of the energy of the transmitted light to the energy of the reflected light is a fixed value.

[0037] Specifically, the incident laser reaches the beam splitter 120 after the power is adjusted by the laser attenuator 110. The transmission-reflection ratio of the beam splitter 120 is preferably nine to one, that is, the total laser light path energy is E, then 1 / 10E of the laser energy is reflected by the beam splitter 120 to become reflected light, and 9 / 10E of the laser energy passes through the beam splitter 120 for material processing. The laser power value used for material processing is nine times the value collected by the power meter 130. At this time, the power meter 130 can indirectly calculate the laser power of the transmitted light path after measuring the laser power of the reflected light path.

[0038] The laser power automatic adjustment device of this embodiment uses a power meter 130 to measure the power of the reflected light path to indirectly obtain the power value of the transmitted light path, eliminating the tedious steps of manually detecting the processing laser. It can detect the attenuation data in time when the laser is attenuated, which not only saves labor costs but also ensures the processing quality through real-time monitoring of the laser power.

[0039] In this embodiment, the device further includes a shutter 150, which is electrically connected to the controller 140 to control the laser to enter the power meter 130. The shutter 150 includes a rotating electromagnet 151 and a light shielding plate 152, and the rotating electromagnet 151 drives the light shielding plate 152 to rotate, and the light shielding plate 152 controls the entry of the laser by rotating.

[0040] Specifically, when there is no need to adjust the laser power, the shutter 150 is closed, that is, the light shield 152 is located on the reflected light path to block the reflected light from passing through to protect the power meter 130. When the laser power needs to be adjusted, the controller 140 controls the rotating electromagnet 151 to rotate and drive the light shield 152, and the light shield 152 moves out of the reflected light path, and the reflected light enters the power meter 130.

[0041] The laser power automatic adjustment device of this embodiment prolongs the service life of the power meter 130 by using the light gate 150, realizes automatic opening and closing of the light gate 150 through the control of the controller 140 on the light gate 150, and realizes automatic control of blocking and passing of the laser beam.

[0042] In this embodiment, the laser attenuator 110 includes a half-wave plate 111 and a polarizing prism 112. The combination of the half-wave plate 111 and the polarizing prism 112 changes the power of the laser beam passing through. The laser attenuator 110 also includes a hollow rotating motor 113. The half-wave plate 111 is mounted on the hollow rotating motor 113. The hollow rotating motor 113 is electrically connected to the controller 140.

[0043] Specifically, the target power is set in the controller 140. When the current power monitored by the power meter 130 is inconsistent with the preset target power, the controller 140 controls the laser attenuator 110 to adjust the power of the laser beam. The hollow rotary motor 113 drives the half-wave plate 111 to rotate, so that the P polarized light rotates, and the polarization prism 112 is used to separate the S polarized light and the P polarized light in the orthogonal direction, thereby achieving the purpose of laser power attenuation.

[0044] The laser power automatic adjustment device of this embodiment uses a half-wave plate 111 to rotate the polarization direction of the laser beam, and uses a polarizing plate to select the transmitted polarization direction. The combination of the two can achieve continuous adjustment of light energy. The hollow rotating motor 113 is then electrically connected to the controller 140. The control of the half-wave plate 111 by the hollow rotating motor 113 can achieve continuous automatic adjustment of the laser beam.

[0045] like Figure 2 As shown, in one embodiment, a laser power automatic adjustment method is applied to the above-mentioned laser power automatic adjustment device, comprising:

[0046] Step S210: establishing a linear function relationship between the power value and the laser attenuator position.

[0047] The number of distinguishable steps of the hollow rotary motor in one rotation is set to K, then the number of adjustment steps from the minimum power to the maximum power of the laser attenuator is K / 8. The minimum power position is known to be g min， The maximum power position is g max =g min +K / 8. The number of distinguishable steps of the hollow rotating motor selected in this embodiment is 31200. The maximum power value g of this embodiment is max With minimum power value g min The relationship is g max =g min +3900. Current minimum power value P 0min (Updated during calibration, cannot be set), current maximum power value P 0max (Updated during calibration, cannot be set), power calibration error Q mw (configurable), target power value P t(settable), power collection rate m (settable). Automatic table creation n segments, the software automatically deducts the initial value position, and the attenuator position is equivalent to the range of 0~K / 8. The table is automatically created in the following mode, where the power value of each point is the average of m power values ​​read after the attenuator moves and waits for 5s, and the power value is read after waiting for 20s at point g0. The power value of each segment is shown in Table 1.

[0048]

[0049]

[0050] Table 1

[0051] A linear function table is established based on the corresponding relationship between the laser attenuator position and the power value, see Table 2.

[0052]

[0053] Table 2

[0054] Among them, P n x is the target power value function of the nth segment, g n x is the attenuator position corresponding to the target power value of the nth segment. Read the target power value P t , query P t In which section, if P t -P n ≥0&P t -P n +1<0 determines the function g of this segment n x=(P t -b n ) / k n Similarly, the position of the attenuator is Integer((P t -b n ) / k n ).

[0055] Step S220 , in response to the difference between the first current power and the target power exceeding a first threshold, calculating a position of the laser attenuator corresponding to the target power according to a functional relationship.

[0056] Set the first threshold, the first threshold is the power calibration error Q mw After the function relationship is established, input any target power value within the range into the controller, wait for the laser attenuator to move to the corresponding position in the function table, and check whether the actual power at the current position and the input target power are within the first threshold. If yes, the calibration is considered successful, otherwise it indicates that the calibration has failed. If the calibration fails, the corresponding position of the laser attenuator of the target power is recalculated according to the linear function relationship.

[0057] Step S230, moving the laser attenuator to a corresponding position.

[0058] After recalculating the corresponding position of the laser attenuator of the target power according to the linear function relationship, the controller controls the laser attenuator to move to the corresponding position.

[0059] Step S240 : in response to the difference between the second current power and the target power exceeding the first threshold, the laser attenuator performs automatic calibration.

[0060] After the laser attenuator moves to the corresponding position, the laser power value adjusted by the laser attenuator at this position is detected again to obtain a second current power value. The difference between the second current power value and the target power value is compared with the first threshold. If it is less than or equal to the first threshold, the calibration is deemed to be successful.

[0061] The laser power automatic adjustment device of this embodiment establishes a linear function relationship between the power value and the laser attenuator position. When the current power value reaches the target power value requirement, the laser attenuator can be adjusted through the established linear function relationship to automatically adjust the current power to the required power, thereby completing the automatic control of the laser power, reducing labor costs, and ensuring processing quality.

[0062] like Figure 3 As shown, in one embodiment, the laser attenuator performs automatic calibration, including:

[0063] Step S241, moving the laser attenuator position and recalculating the calibration coefficient.

[0064] When the difference between the second current power and the target power exceeds the first threshold, it is determined that the calibration has failed, and the laser attenuator performs automatic calibration. The laser attenuator returns to the maximum power position and the minimum power position respectively, and the calibration coefficients k and b are calculated respectively.

[0065] Step S242: re-establishing the functional relationship between the power value and the laser attenuator position according to the calibration coefficient.

[0066] After the calibration coefficients k and b are calculated, a new function table is generated based on the calibration coefficients, and the functional relationship between the power value and the laser attenuator position is re-established based on the function table.

[0067] The laser power automatic adjustment method of this embodiment automatically calibrates the laser power automatic adjustment device when the difference between the current power value and the target power value exceeds a first threshold value, reestablishes the linear function relationship between the power value and the laser attenuator, and reduces the generation of system errors.

[0068] like Figure 4 As shown, in one embodiment, the method further includes:

[0069] Step S251 : after the laser attenuator performs automatic calibration, the corresponding position of the laser attenuator of the target power is recalculated according to the functional relationship.

[0070] After the laser attenuator automatic calibration establishes a new linear function relationship, the target power is again brought into the calculation of the laser attenuator position.

[0071] Step S252, moving the laser attenuator to a corresponding position.

[0072] After the target power is brought into the linear function relationship, the corresponding position of the laser attenuator is calculated and then the laser attenuator is moved to the corresponding position.

[0073] Step S253 : in response to the difference between the third current power and the target power exceeding the first threshold, the laser attenuator performs manual calibration.

[0074] After moving the laser attenuator to the corresponding position, the power value of the current laser beam is detected again to obtain a third current power value, and the difference between the third current power value and the target power is compared with the first threshold. If the difference between the third current power value and the target power value is less than or equal to the first threshold (|third current power value - target power value|≤first threshold), it is determined that the calibration is successful; if the difference between the third current power value and the target power value is greater than the first threshold (|third current power value - target power value|>first threshold m), it is determined that the calibration has failed, and the function table calibration is performed manually.

[0075] The manual calibration steps include:

[0076] Step S51, assuming that the new function is y=k c *y0+b c , move the attenuator to g min Position, at this time the minimum power is P 0min , read the current power P min , we get k c *P 0min +b c =P min .

[0077] Step S52, move the attenuator to g max Position, at which the maximum power is P 0max , read the current power P max , we get k c *P 0max +b c =P max .

[0078] Step S53, get k c -(P max -P min ) / (P0max -P 0min );b c =1 / 2P max +P min -k c *(P 0max +P 0min ).

[0079] Step S54, then k l =k l *k c , k2=k2*k c , ..., k n =k n *k c ;

[0080] And b l =k c *b l +b c , b2=k c *b2+b c , ..., b n =k c *b n +b c .

[0081] Step S55, after k and b calibration is completed, the attenuator is moved to the target position again.

[0082] Step S56, comparing the difference between the current power value of the laser attenuator and the target power with the first threshold value to determine whether the calibration is successful. If it is determined that the calibration is unsuccessful, step S241 is re-executed.

[0083] The laser power automatic adjustment method of this embodiment compares the target power with the current power. If they are within the calibration error range (i.e., the first threshold), the calibration is considered to be successful. At this time, the laser power is considered to be stable and can ensure normal processing work. If the comparison between the target power and the current power is outside the calibration error range, it is considered that the laser power is attenuated at this time. At this time, the target power is brought into the controller's software program again to calculate the laser attenuator position and move it to the specified position. The software reads the difference between the current power and the target power again. If the power is within the power calibration error, the calibration is considered to be successful. Otherwise, it is considered to be a calibration failure. The laser attenuator performs automatic calibration, and the laser attenuator returns to the maximum power position and the minimum power position. The laser attenuator position is calculated and moved to the specified position. The software reads the current power and compares the target power. If they are within the power calibration error, the calibration is considered to be successful. If the automatic calibration of the device fails, manual intervention is required for calibration.

[0084] like Figure 5As shown, in one embodiment, a linear functional relationship is established between the power value and the laser attenuator position, including:

[0085] Step S211, obtaining the laser attenuator position and collecting the power value.

[0086] The number of distinguishable steps of the hollow rotary motor in one rotation is set to K, then the number of adjustment steps from the minimum power to the maximum power of the laser attenuator is K / 8. The minimum power position is known to be g min , then the maximum power position is g max =g min +K / 8. The number of distinguishable steps of the hollow rotating motor selected in this embodiment is 31200. The maximum power value g of this embodiment is max With minimum power value g min The relationship is g max =g min +3900. After the parameter setting is completed, the laser attenuator moves to the specified position in sequence according to the set position to read the power value. The positions of the laser attenuator's specified position are 0, 300, 600, 900, ..., 3900.

[0087] Step S212: establishing a function table according to the laser attenuator position and the collected power value.

[0088] The automatic table building is divided into 13 sections. Users can define the number of sections according to accuracy requirements and build a function table corresponding to the laser attenuator position and the current power value.

[0089] Step S213, establishing a linear function relationship according to the function table.

[0090] The k value and the b value are calculated according to the piecewise linear function, thereby establishing a functional relationship between the output power value and the position of the laser attenuator.

[0091] The above-mentioned laser power automatic adjustment method achieves the goal of establishing a function table and automatic power calibration by developing software for the controller to automatically control the laser adjustment device, realizes automatic control of the laser attenuator, ensures the stability of the laser power during laser processing, and effectively improves the processing quality.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A laser power automatic adjustment device, characterized in that: The device comprises: Laser attenuator, used to adjust the laser power; A beam splitter is used to separate the incident laser light, wherein the portion of the incident laser light that passes through the beam splitter is the transmitted light, and the portion of the incident laser light that is reflected by the beam splitter is the reflected light; A power meter, installed on the optical path of the reflected light, for measuring the power value of the reflected light; The controller is used to receive the power value measured by the power meter and control the laser attenuator to adjust the power according to the power value.

2. The laser power automatic adjustment device according to claim 1, characterized in that: The ratio of the energy of the transmitted light to the energy of the reflected light is a fixed value.

3. The laser power automatic adjustment device according to claim 1, characterized in that: The device also includes an optical shutter, which is electrically connected to the controller and is used to control the laser to enter the power meter.

4. The laser power automatic adjustment device according to claim 3, characterized in that: The optical shutter comprises a rotating electromagnet and a light blocking plate. The rotating electromagnet drives the light blocking plate to rotate, and the light blocking plate controls the entry of laser light by rotating.

5. The laser power automatic adjustment device according to claim 1, characterized in that: The laser attenuator comprises a half-wave plate and a polarizing prism, and the combination of the half-wave plate and the polarizing prism changes the power of the transmitted laser beam.

6. The laser power automatic adjustment device according to claim 5, characterized in that: The laser attenuator further comprises a hollow rotating motor, the half-wave plate is mounted on the hollow rotating motor, and the hollow rotating motor is electrically connected to the controller.

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