Divergence angle testing device and method

Abstract

The invention discloses a divergence angle testing device and method, and relates to the technical field of laser divergence angle testing, and the divergence angle testing device comprises a control module; a mounting table; the diaphragm is provided with a transmission hole; the optical fiber mounting assembly is mounted on the mounting table in a sliding and lifting manner; a light target; and the moving mechanism is used for driving the optical fiber mounting assembly to move, and the moving mechanism is electrically connected with the control module. According to the technical scheme, the deviation direction and the deviation length of the circle center of the calibration light spot relative to the circle center of the detection target surface are automatically detected through the control module and the light target, then the moving mechanism is controlled through the control module, the optical fiber mounting assembly is made to move, the optical fiber can be automatically adjusted to be coaxial with the transmission hole, and the detection accuracy is improved. And the automatic test of the divergence angle of the laser is realized, and the problem that the operation error is large when the laser is adjusted to be coaxial with the center of the diaphragm is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser divergence angle testing, and in particular to a divergence angle testing device and method. Background Art

[0002] As an important parameter indicator in the production and application of lasers, the laser divergence angle can effectively guide the production process of fiber lasers and provide effective data support for matching better cutting heads, welding heads and other laser processing equipment. During the test of the divergence angle, the operating error when adjusting the laser to be coaxial with the aperture center is large. Summary of the invention

[0003] The main purpose of the present invention is to provide a divergence angle testing device and method, aiming to improve the problem of large operating errors when adjusting the laser to be coaxial with the aperture center.

[0004] To achieve the above object, the divergence angle testing device proposed in the present invention comprises:

[0005] Mounting table;

[0006] An aperture, disposed on the mounting platform, the aperture having a transmission hole;

[0007] An optical fiber installation assembly, arranged on one side of the installation platform, for fixing the optical fiber;

[0008] A moving mechanism is installed on the installation platform, the optical fiber installation assembly is installed on the moving mechanism, the moving mechanism has a first adjustment stroke and a second adjustment stroke perpendicular to each other on a horizontal plane, and a third adjustment stroke arranged in a vertical direction, the first adjustment stroke is arranged parallel to the axis of the transmission hole;

[0009] An optical target assembly, comprising a driving assembly and an optical target, wherein the driving assembly is arranged on a side of the aperture away from the optical fiber mounting assembly, the optical target is mounted on the driving assembly, and the optical target has a detection target surface corresponding to the aperture, a plurality of optical sensing modules are arranged on the detection target surface, and the optical target has a first position and a second position on the mounting platform, and the driving assembly is used to drive the optical target to switch between the first position and the second position; and,

[0010] A control module, electrically connected to the driving assembly and the moving mechanism, for controlling the driving assembly and the moving mechanism to start and stop;

[0011] Wherein, when the light target is located at the first position, the light target is coaxial with the transmission hole, and when the light target is located at the second position, the light target is staggered with the laser light path passing through the transmission hole.

[0012] In one embodiment, the driving structure includes:

[0013] A mounting bracket disposed on the mounting table;

[0014] A driving motor disposed on the mounting bracket, the driving motor being electrically connected to the control module; and,

[0015] A connecting arm connecting the optical target and the output shaft of the driving motor.

[0016] In one embodiment, a first limiting block is provided on the mounting bracket. When the optical target moves to the first position, the connecting arm abuts against the first limiting block.

[0017] In one embodiment, the divergence angle testing device includes a monitoring probe for detecting abnormal laser light, the monitoring probe being electrically connected to the control module.

[0018] In one embodiment, a laser power meter is provided on the mounting table. The laser power meter is located on the side of the detection target surface away from the optical fiber mounting assembly. The side of the laser power meter close to the aperture has a power meter target surface, and the power meter target surface is coaxial with the transmission hole.

[0019] In one embodiment, the control module is electrically connected to the laser power meter, and the control module is configured to receive the power data measured by the laser power meter.

[0020] In one embodiment, the optical fiber mounting assembly includes a supporting seat and a clamping block. The supporting seat is mounted on the moving mechanism. The top side of the supporting seat has a first clamping groove extending along the first adjustment stroke direction for placing the optical fiber, and the clamping block is disposed on the top side of the supporting seat.

[0021] The present invention also provides a divergence angle testing method based on the divergence angle testing device. The divergence angle testing device includes:

[0022] A mounting table;

[0023] An aperture disposed on the mounting table, the aperture having a transmission hole;

[0024] An optical fiber mounting assembly disposed on one side of the mounting table for fixing an optical fiber;

[0025] A moving mechanism mounted on the mounting table, the optical fiber mounting assembly being mounted on the moving mechanism. The moving mechanism has a first adjustment stroke and a second adjustment stroke perpendicular to each other on a horizontal plane, and a third adjustment stroke disposed in the vertical direction. The first adjustment stroke is parallel to the axis of the transmission hole;

[0026] The optical target assembly includes a driving assembly and an optical target. The driving assembly is disposed on a side of the diaphragm away from the optical fiber mounting assembly. The optical target is mounted on the driving assembly, and the optical target has a detection target surface corresponding to the diaphragm. A plurality of light sensing modules are arranged on the detection target surface, and the optical target has a first position and a second position on the mounting table. The driving assembly is configured to drive the optical target to switch between the first position and the second position; and,

[0027] A control module is electrically connected to the driving assembly and the moving mechanism to control the driving assembly and the moving mechanism to start and stop;

[0028] Wherein, when the optical target is in the first position, the optical target is coaxial with the transmission hole. When the optical target is in the second position, the optical target is offset from the laser light path passing through the transmission hole;

[0029] The divergence angle testing method includes:

[0030] Step S1: Fix the optical fiber on the optical fiber mounting assembly so that the laser module under test emits calibration light;

[0031] Step S2: Control the optical target to move to the first position through the control module;

[0032] Step S3: Control the moving mechanism through the control module so that the optical fiber mounting assembly moves along and approaches the diaphragm, so that the calibration light emitted by the optical fiber completely passes through the transmission hole, and the calibration light forms a calibration light spot on the detection target surface;

[0033] Step S4: Control the plurality of light sensing modules through the control module to detect the shape and size of the calibration light spot;

[0034] Step S5: Control the optical fiber mounting assembly to slide along the first adjustment stroke direction through the control module, so that the calibration light spot is circular and the size of the calibration light spot is smaller than the detection target surface;

[0035] Step S6: Control the plurality of light sensing modules through the control module to measure the direction and distance of the offset of the center of the calibration light spot relative to the center of the detection target surface;

[0036] Step S7: Control the optical fiber mounting assembly to move along the second adjustment stroke direction and the third adjustment stroke direction respectively through the control module, so that the emission end of the optical fiber is coaxial with the detection target surface;

[0037] Step S8: Select the number of repetitions and repeat steps S5 - S7 with the number of repetitions;

[0038] Step S9: Through the control module, control the light target to move away from the first position so that the light target avoids the calibration light emitted by the optical fiber.

[0039] Step S10: Turn off the calibration light of the laser module under test, turn on the laser control of the laser module under test, so that the laser under test is emitted from the optical fiber end, select the power under test, and measure the divergence angle at the corresponding power under test.

[0040] In an embodiment, step S7 includes:

[0041] Step S71: Through the control module, obtain the offset direction and distance of the center of the calibration light spot relative to the center of the detection target surface, and decompose it into a first offset amount in the positive direction along the second adjustment stroke direction and a second offset amount in the positive direction along the third adjustment stroke direction.

[0042] Step S72: Through the control module, control the optical fiber mounting assembly to move the first offset amount in the negative direction along the second adjustment stroke direction, and control the optical fiber mounting assembly to move the second offset amount in the negative direction along the third adjustment stroke direction.

[0043] A laser power meter is provided on the mounting table. The laser power meter is located on the side of the detection target surface away from the optical fiber mounting assembly. One side of the laser power meter close to the aperture has a power meter target surface, and the power meter target surface is coaxial with the transmission hole; the control module is electrically connected to the laser power meter, and the control module is used to receive the power data measured by the laser power meter.

[0044] Step S10 includes:

[0045] Step S101: Control the light target to move to the second position so that the laser irradiates the power meter target surface, and measure the laser power of the laser irradiating the power meter target surface through the laser power meter.

[0046] Step S102: Select the test power, and control the movement of the optical fiber mounting assembly so that the power measured by the laser power meter reaches the test power.

[0047] Step S103: Measure the distance between the emission end of the optical fiber and the center point of the transmission hole, and measure the laser divergence angle at the test power according to the aperture of the transmission hole.

[0048] The technical solution of the present invention can detect the size and shape of the light spot irradiated on the detection target surface through the multiple light sensing modules on the detection target surface of the light target. By controlling the moving mechanism through the control module, the optical fiber installation assembly is moved along the first adjustment stroke direction, so that all the laser light can be irradiated on the detection target surface, so that the light spot on the detection target surface is circular and the size of the light spot is not larger than the detection target surface. The multiple light sensing modules cooperate with each other to detect the offset direction and offset length of the center of the light spot relative to the center of the detection target surface. According to the offset direction and offset length of the center of the light spot, the control module controls the moving mechanism to move the optical fiber installation assembly along the second adjustment stroke direction and the third adjustment stroke direction respectively, so that the center of the light spot can be moved to coincide with the center of the detection target surface, thereby adjusting the optical fiber to be coaxial with the center of the diaphragm. By detecting the offset amount of the light emitted by the optical fiber relative to the axis of the diaphragm through the light sensing module, the optical fiber can be adjusted to be coaxial with the transmission hole in an automatic control manner, improving the problem of large operation error when adjusting the laser to be coaxial with the center of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0050] Figure 1 Structural schematic diagram of an embodiment of the divergence angle testing device provided by the present invention;

[0051] Figure 2 For Figure 1 Partial connection structure schematic diagram of the divergence angle testing device in

[0052] Figure 3 For Figure 2 Partial enlarged view at A in

[0053] Figure 4 For Figure 1 Control flow chart of the divergence angle testing device applied in

[0054] Figure 5 For Figure 4 Specific control flow of S7 in

[0055] Figure 6 For Figure 4 Specific control flow of S10 in

[0056] Description of the reference numerals in the drawings:

[0057] 1. Mounting table; 11. First slide rail; 12. First slide seat; 13. Second slide rail; 14. Second slide seat; 15. First lifting rail; 16. Mounting seat; 2. Diaphragm; 21. Transmission hole; 3. Optical fiber mounting assembly; 31. Support seat; 32. Soft pad; 321. First clamping groove; 33. Clamping block; 4. Optical target; 41. Detection target surface; 5. Driving assembly; 51. Mounting frame; 511. First limiting block; 512. Second limiting block; 52. Driving motor; 53. Connecting arm; 6. Control module; 7. Laser power meter; 71. Power meter target surface; 8. Monitoring probe.

[0058] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0062] With the continuous development of laser technology in recent years, the application scenarios of lasers in the field of material processing have become increasingly numerous. The importance and superiority of laser processing technology are mainly reflected in its extensive application fields and high-efficiency, high-precision processing capabilities, which can promote the transformation and upgrading of traditional industries and demonstrate great potential in multiple industries. In particular, fiber lasers play an extremely important role in various processing fields with their advantages of miniaturization, good beam quality, strong long-term stability, and easy realization of high power / high efficiency.

[0063] As an important parameter index in the manufacturing and application process of lasers, accurate test results of the laser divergence angle can not only effectively guide the manufacturing process of fiber lasers but also provide effective data support for matching better laser processing equipment such as cutting heads and welding heads. During the divergence angle test, the coaxiality between the center of the aperture and the laser beam has a very significant impact on the test accuracy of the divergence angle. Relying on personnel to adjust the laser to be coaxial with the transmission hole of the aperture cannot avoid the operation errors brought by the operator, resulting in relatively large operation errors when adjusting the laser to be coaxial with the center of the aperture.

[0064] The present invention proposes a divergence angle test device.

[0065] Please refer to Figure 1 and Figure 2 In an embodiment of the present invention, the divergence angle test device includes:

[0066] Mounting table 1;

[0067] Aperture 2, arranged on the mounting table 1, and the aperture 2 has a transmission hole 21;

[0068] Fiber optic mounting assembly 3, arranged on one side of the mounting table 1 for fixing the optical fiber;

[0069] A moving mechanism, installed on the mounting table 1, and the fiber optic mounting assembly 3 is installed on the moving mechanism. The moving mechanism has a first adjustment stroke and a second adjustment stroke perpendicular to each other on a horizontal plane, and a third adjustment stroke arranged in the vertical direction. The first adjustment stroke is arranged parallel to the axis of the transmission hole 21;

[0070] Light target 4 assembly, including a driving assembly 5 and a light target 4. The driving assembly 5 is arranged on the side of the aperture 2 away from the fiber optic mounting assembly 3. The light target 4 is installed on the driving assembly 5, and the light target 4 has a detection target surface 41 corresponding to the aperture 2. A plurality of light sensing modules are arranged on the detection target surface 41, and the light target 4 has a first position and a second position on the mounting table 1. The driving assembly 5 is used to drive the light target 4 to switch between the first position and the second position; and,

[0071] The control module 6 is electrically connected to the driving component 5 and the moving mechanism for controlling the start and stop of the driving component 5 and the moving mechanism.

[0072] Wherein, when the light target 4 is located at the first position, the light target 4 is coaxial with the transmission hole 21, and when the light target 4 is located at the second position, the light target 4 is offset from the laser light path passing through the transmission hole 21.

[0073] The technical solution of the present invention connects the calibration light source through an optical fiber. Multiple light sensing modules on the detection target surface 41 of the light target 4 can detect the size and shape of the light spot irradiated on the detection target surface 41. By controlling the moving mechanism through the control module 6, the optical fiber installation component 3 is moved along the first adjustment stroke direction, so that the calibration light emitted by the optical fiber can be completely irradiated on the detection target surface 41, forming a calibration light spot on the detection target surface 41, so that the calibration light spot on the detection target surface 41 is circular and the size of the calibration light spot is not larger than the detection target surface 41. Multiple light sensing modules cooperate to detect the offset direction and offset length of the center of the calibration light spot relative to the center of the detection target surface 41. According to the offset direction and offset length of the center of the calibration light spot, by controlling the moving mechanism through the control module, the optical fiber installation component 3 is moved along the second adjustment stroke direction and the third adjustment stroke direction respectively, so that the center of the calibration light spot can be moved to coincide with the center of the detection target surface 41, thereby adjusting the optical fiber to be coaxial with the center of the aperture 2. By detecting the offset amount of the light emitted by the optical fiber relative to the axis of the aperture 2 through the light sensing module, the optical fiber can be adjusted to be coaxial with the transmission hole in an automatic control manner, improving the problem of large operation error when adjusting the laser to be coaxial with the center of the aperture 2.

[0074] Please refer to Figure 1 and Figure 2 , specifically, the detection target surface 41 is a CCD target surface, and the light sensing module is a photodiode (PD). The photodiode can convert the received optical signal into an electrical signal, and the CCD is a charge coupled device.

[0075] A plurality of light detection rings are formed on the detection target surface 41. The plurality of light detection rings are coaxial, and the diameter difference between any two adjacent light detection rings is a determined value. The light detection ring includes a plurality of light sensing modules arranged equidistantly in the circumferential direction of the detection target surface 41. By adjusting the diameter difference between adjacent light detection rings and the number of light sensing modules in each light detection ring, the detection accuracy of the detection target surface 41 for the calibration light spot can be adjusted.

[0076] The driving structure includes:

[0077] Mounting bracket 51, provided on the mounting table 1;

[0078] Drive motor 52, provided on the mounting bracket 51; and,

[0079] Connecting arm 53, connecting the light target 4 and the output shaft of the drive motor 52.

[0080] When the drive motor 52 rotates, the connecting arm 53 can drive the light target 4 to move.

[0081] Specifically, the rotation axis of the drive motor 52 is parallel to the first adjustment travel direction, and a first limit block 511 is provided on the mounting bracket 51. When the light target 4 moves to the first position, the connecting arm 53 abuts against the first limit block 511. When the drive motor 52 rotates and the first connecting arm 53 abuts against the first limit block 511, the limit of the movement of the drive motor 52 is achieved, which is convenient for accurately moving the light target 4 to the first position.

[0082] A first limit groove is provided on one side of the first limit block 511 close to the connecting arm 53. When the connecting arm 53 moves and abuts against the first limit block 511, a part of the connecting arm 53 is located in the first limit groove.

[0083] Please refer to Figure 1 and Figure 2 , a second limit block 512 is further provided on the mounting bracket 51. The connecting arm 53 is located between the first limit block 511 and the second limit block 512. When the light target 4 moves and moves away from the first position, the second limit block 512 can abut against the connecting arm 53 to achieve the limit of the rotation of the connecting arm 53. A second limit groove is provided on one side of the second limit block 512 close to the connecting arm 53. When the connecting arm 53 abuts against the second limit block 512, a part of the connecting arm 53 is located in the second limit groove.

[0084] The divergence angle testing device further includes a control module 6. The control module 6 is used to control the optical fiber mounting assembly 3 to move along the first adjustment travel direction, the second adjustment travel direction, and the third adjustment travel direction respectively. The plurality of light sensing modules are all electrically connected to the control module 6. With the help of the control module 6, the offset of the center of the calibration light spot relative to the detection target surface 41 can be calculated, and then by controlling the movement of the optical fiber mounting assembly 3 through the control module 6, the center of the calibration light spot can be automatically adjusted to coincide with the center of the detection target surface 41, reducing the operation error generated during manual adjustment and improving the accuracy of adjustment.

[0085] Furthermore, the drive motor 52 is electrically connected to the control module 6, and the position of the optical target 4 can be adjusted through the control module 6.

[0086] The control module 6 is preferably a computer, which includes a display screen and an input device. When the calibration light spot is at the first position and the laser irradiates the optical target 4, the display screen can display the shape, size, and position of the calibration light spot on the detection target surface 41, and can accurately obtain the offset direction and length of the center of the calibration light spot relative to the center of the detection target surface 41, facilitating the calculation of the moving direction and distance required for the optical fiber installation assembly 3 when adjusting the center of the calibration light spot to coincide with the center of the detection target surface 41, and controlling the movement of the optical fiber installation assembly 3 to make the center of the calibration light spot coincide with the center of the detection target surface 41.

[0087] The moving direction and distance of the optical fiber installation assembly 3 can be input by the operator through the input device and then drive the optical fiber installation assembly 3 to move, or can be automatically calculated by the computer and automatically drive the optical fiber installation assembly 3 to move.

[0088] A laser power meter 7 is provided on the mounting table 1. The laser power meter 7 is located on the side of the detection target surface 41 away from the optical fiber installation assembly 3. One side of the laser power meter 7 close to the diaphragm 2 has a power meter target surface 71, and the power meter target surface 71 is coaxial with the transmission hole 21. The laser power meter 7 can detect the power of the laser irradiating on the power meter target surface 71, thereby obtaining the power of the laser passing through the transmission hole 21 of the diaphragm 2.

[0089] The control module 6 is electrically connected to the laser power meter 7. The control module 6 is used to receive the power data measured by the laser power meter 7; the control module 6 is also used to control the optical fiber installation assembly 3 to move along the first adjustment stroke direction.

[0090] The laser power meter 7 is detachably arranged on the mounting table 1. By replacing the laser power meter 7 or adjusting the distance between the laser power meter 7 and the diaphragm 2, the size of the laser light spot on the power meter target surface 71 can be controlled so that the size of the laser light spot accounts for 60%-80% of the range of the power meter target surface 71.

[0091] Among them, it should be noted that after the power meter 7 receives a laser with a certain power, it will not immediately display the true power value. It will display the accurate power after a certain period of thermal equilibrium, and at this time, the power value will stabilize. Therefore, the reading time of the power value can be designed through a program, that is, during the test, the time range for reading the power value is determined through the control program. When specifically reading the power value, the reading time range and the power stability are combined to determine the final power value, thereby further ensuring the accuracy of the detection data and improving the test accuracy.

[0092] When measuring the divergence angle at a specific power, first control the laser spot to move away from the first position to prevent the laser from irradiating the light target 4, and then control the movement of the optical fiber installation component 3. When the power parameter obtained by the control module 6 is equal to the specific power, stop moving the optical fiber installation component 3. The divergence angle of the optical fiber at a specific power can be obtained through the position of the optical fiber installation component 3 and the aperture of the transmission hole 21 of the diaphragm 2.

[0093] A first slide rail 11 is provided on the mounting table 1. The first slide rail 11 extends along the first adjustment stroke direction. A first slide seat 12 is slidably mounted on the first slide rail 11. The optical fiber installation component 3 is slidably mounted on the first slide seat 12 along the second adjustment stroke direction, and the optical fiber installation component 3 is vertically installed on the first slide seat 12 along the third adjustment stroke direction. The moving mechanism includes a first driving mechanism. The first driving mechanism is used to drive the first slide seat 12 to move along the first slide rail 11, and the first driving mechanism is electrically connected to the control module 6. The first driving mechanism is a prior art, so the first driving mechanism will not be further disclosed; by controlling the first driving mechanism, the optical fiber installation component 3 can be made to drive the optical fiber to move along the first adjustment stroke direction.

[0094] A second slide rail 13 is provided on the first slide seat 12. The second slide rail 13 extends along the second adjustment stroke direction. A second slide seat 14 is slidably mounted on the second slide rail 13. The optical fiber installation component 3 is vertically installed on the second slide seat 14 along the third adjustment stroke direction. The moving mechanism includes a second driving mechanism. The second driving mechanism is used to drive the second slide seat 14 to move along the second slide rail 13, and the second driving mechanism is electrically connected to the control module 6. The second driving mechanism is a prior art, so the second driving mechanism will not be further disclosed; by controlling the second driving mechanism, the optical fiber installation component 3 can be made to drive the optical fiber to move along the second adjustment stroke direction.

[0095] A first lifting rail 15 is provided on the second sliding seat 14. The first lifting rail 15 extends along the third adjustment stroke direction. The optical fiber mounting assembly 3 includes a mounting seat 16, and the mounting seat 16 is mounted on the first lifting rail 15 in a liftable manner. The moving mechanism includes a third driving mechanism for driving the mounting seat 16 to lift. The third driving mechanism is electrically connected to the control module 6, and since the third driving mechanism is a prior art, no further disclosure of the third driving mechanism is made. The up and down movement of the mounting seat 16 is realized, so as to adjust the position of the optical fiber clamped by the optical fiber mounting assembly 3.

[0096] Please refer to Figure 2 and Figure 3 , the optical fiber mounting assembly 3 includes a supporting seat 31 and a clamping block 33. The top side of the supporting seat 31 has a first clamping groove 321 that extends along the first adjustment stroke direction. The first clamping groove 321 is used for placing the optical fiber, and the clamping block is provided on the top side of the supporting seat 31. After the optical fiber is placed in the first clamping groove 321, the clamping block and the supporting seat 31 can clamp and fix the optical fiber from the upper side.

[0097] Specifically, the supporting seat 31 includes a seat body and a soft pad 32. The seat body is fixedly connected to the mounting seat 16, and the soft pad 32 is detachably and fixedly mounted on the upper side of the seat body. The first clamping groove 321 is opened on the upper side of the soft pad 32, which can reduce the damage to the optical fiber. By replacing different soft pads 32, optical fibers of different sizes can be adapted.

[0098] Among them, a sinking groove is formed by the downward concavity of the upper end surface of the supporting seat 31 and is arranged in a penetrating manner corresponding to the first adjustment forming direction. The soft pad 32 is installed inside the sinking groove. As described above, the soft pad 32 can be replaced, and correspondingly, different first clamping grooves 321 with different radius values are formed on the soft pad 32. In order to further expand the applicable range of the entire optical fiber mounting assembly 3, the actual length of the soft pad 32 and the specific shape of the first clamping groove 321 can also be set according to the actual external structural shape of the test piece. For example, it can be replaced with a corresponding shape for clamping the output optical cable, so that the entire clamping structure can also be used for relevant tests of the output optical cable.

[0099] The size of the transmission hole 21 of the diaphragm 2 is variably set. By changing the size of the transmission hole 21, different optical fibers can be adapted.

[0100] The control of the transmission hole 21 of the diaphragm 2 can be electrically controlled. The diaphragm 2 is electrically connected to the control module 6, and through the control module, the aperture of the transmission hole 21 can be adjusted.

[0101] Please refer to Figure 2 and Figure 3 wherein the optical fiber is connected to a calibration light source and a laser light source. The calibration light source can be a red light source, and the laser light source is the light source of the laser to be measured. When the light target 4 is in the first position, the damage laser light source is interrupted, and calibration light is emitted from the optical fiber, reducing the damage caused by the laser to the light target 4.

[0102] The divergence angle testing device further includes a monitoring probe 8 for detecting abnormal laser, and the monitoring probe is electrically connected to the control module. The monitoring probe 8 includes a filter for filtering out the spectral components in the near-infrared band of the received light and only retaining the visible light band. When the optical fiber is damaged or even burned, abnormal light is generated, and the monitoring probe 8 can detect the abnormal light to facilitate timely problem discovery.

[0103] A buckle is further provided on the mounting bracket 51 for fixing the connecting arm 53, reducing the shaking of the connecting arm 53.

[0104] The present invention also proposes a divergence angle testing method. Please refer to Figures 1 to 6 simultaneously. The divergence angle testing method includes a divergence angle testing device. The specific structure of the divergence angle testing device refers to the above embodiments. Since the present divergence angle testing method adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0105] The divergence angle testing device includes:

[0106] A mounting table 1;

[0107] A diaphragm 2 provided on the mounting table 1, and the diaphragm 2 has a transmission hole 21;

[0108] An optical fiber mounting assembly 3 provided on one side of the mounting table 1 for fixing the optical fiber;

[0109] A moving mechanism installed on the mounting table 1, and the optical fiber mounting assembly 3 is installed on the moving mechanism. The moving mechanism has a first adjustment stroke and a second adjustment stroke perpendicular to each other on a horizontal plane, and a third adjustment stroke arranged in the vertical direction. The first adjustment stroke is arranged parallel to the axis of the transmission hole 21;

[0110] The light target 4 assembly includes a driving assembly 5 and a light target 4. The driving assembly 5 is disposed on a side of the aperture 2 away from the optical fiber mounting assembly 3. The light target 4 is mounted on the driving assembly 5, and the light target 4 has a detection target surface 41 corresponding to the aperture 2. A plurality of light sensing modules are provided on the detection target surface 41, and the light target 4 has a first position and a second position on the mounting table 1. The driving assembly 5 is used to drive the light target 4 to switch between the first position and the second position; and,

[0111] A control module 6 is electrically connected to the driving assembly 5 and the moving mechanism to control the driving assembly 5 and the moving mechanism to start and stop;

[0112] Wherein, when the light target 4 is in the first position, the light target 4 is coaxial with the transmission hole 21. When the light target 4 is in the second position, the light target 4 is offset from the laser light path passing through the transmission hole 21.

[0113] The divergence angle testing method includes:

[0114] Step S1: Fix the optical fiber on the optical fiber mounting assembly and connect the optical fiber to a calibration light source so that the optical fiber emits calibration light;

[0115] Step S2: Control the light target to move to the first position through the control module;

[0116] Step S3: Control the moving mechanism through the control module to move the optical fiber mounting assembly along and close to the aperture so that the calibration light emitted by the optical fiber completely passes through the transmission hole, and the calibration light forms a calibration light spot on the detection target surface;

[0117] Step S4: Control the plurality of light sensing modules through the control module to detect the shape and size of the calibration light spot;

[0118] Step S5: Control the optical fiber mounting assembly to slide along the first adjustment stroke direction through the control module so that the calibration light spot is circular and the size of the calibration light spot is smaller than the detection target surface;

[0119] Step S6: Control the plurality of light sensing modules through the control module to measure the direction and distance of the offset of the center of the calibration light spot relative to the center of the detection target surface;

[0120] Step S7: Control the optical fiber mounting assembly to move along the second adjustment stroke direction and the third adjustment stroke direction respectively through the control module so that the emission end of the optical fiber is coaxial with the detection target surface;

[0121] Step S8: Select the number of repetitions, and repeat Step S5 - Step S7 according to the number of repetitions;

[0122] Step S9: Through the control module, control the light target to move away from the first position so that the light target avoids the calibration light emitted by the optical fiber;

[0123] Step S10: Disconnect the optical fiber from the calibration light source, connect the optical fiber to the laser source, select the power to be measured, and measure the divergence angle at the corresponding power to be measured.

[0124] In Step S8, the number of repetitions depends on the actual situation. Specifically, when the size of the calibration light spot is not less than the detection target surface 41, stop repeating the optical fiber axis adjustment step. By repeating the optical fiber axis adjustment step multiple times, the coaxiality of the optical fiber and the transmission hole 21 of the diaphragm 2 is ensured.

[0125] Further, before moving the light target 4 to the first position, control the calibration light source to turn on and control the laser light source to interrupt, reducing the damage caused by the laser irradiating on the light target 4.

[0126] In Step S5, when a part of the multiple light sensing modules receives the calibration light signal and the outermost circle of light sensing modules does not receive the calibration light signal, it can ensure that the calibration light completely irradiates on the detection target surface 41. The multiple light sensing modules cooperate to detect the center of the calibration light spot.

[0127] Step S7 includes:

[0128] Step S71: Through the control module, obtain the offset direction and distance of the center of the calibration light spot relative to the center of the detection target surface, and decompose it into a first offset amount in the positive direction along the second adjustment stroke direction and a second offset amount in the positive direction along the third adjustment stroke direction;

[0129] Step S72: Through the control module, control the optical fiber mounting assembly to move the first offset amount in the negative direction along the second adjustment stroke direction, and control the optical fiber mounting assembly to move the second offset amount in the negative direction along the third adjustment stroke direction.

[0130] Specifically, the center of the calibration light spot, the axis of the calibration light, and the optical fiber are on the same axis, and the offset amount of the center of the light spot is equal to the offset amount of the optical fiber. The positive direction of the second adjustment stroke direction and the positive direction of the third adjustment stroke direction can be set according to actual needs.

[0131] A laser power meter 7 is provided on the installation table 1. The laser power meter 7 is located on the side of the detection target surface 41 away from the optical fiber installation assembly 3. One side of the laser power meter 7 close to the diaphragm 2 has a power meter target surface 71, and the power meter target surface 71 is coaxial with the transmission hole 21; the control module is electrically connected to the laser power meter, and the control module is used to receive the power data measured by the laser power meter;

[0132] The step S10 includes:

[0133] Step S101: Control the light target to move to the second position so that the laser irradiates the power meter target surface, and measure the laser power of the laser irradiating the power meter target surface through the laser power meter;

[0134] Step S102: Select a test power, and control the movement of the optical fiber installation assembly so that the power measured by the laser power meter reaches the test power;

[0135] Step S103: Measure the distance between the emitting end of the optical fiber and the center point of the transmission hole, and measure the laser divergence angle at the test power according to the aperture of the transmission hole.

[0136] Further, the control module 6 can measure the position of the optical fiber installation assembly 3, so as to obtain the distance between the emitting end of the optical fiber and the center point of the transmission hole 21. By inputting the aperture of the transmission hole 21 into the control module 6, the control module 6 can calculate the laser emission angle at the test power.

[0137] In step S103, the test power is not greater than the power of the laser light source, and the value of the test power can be obtained according to the percentage value of the test power to be measured.

[0138] Specifically, after moving the light target 4 away from the first position, control the laser light source to turn on to ensure that the laser irradiates the power meter target surface 71.

[0139] When controlling the movement of the optical fiber installation assembly 3 and making the laser emitted from the optical fiber completely irradiate the power meter target surface 71, the power of the laser light source connected to the optical fiber can be measured.

[0140] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A divergence angle testing device, characterized in that, include: Mounting table; An aperture, disposed on the mounting platform, the aperture having a transmission hole; An optical fiber installation assembly, arranged on one side of the installation platform, for fixing the optical fiber; A moving mechanism is installed on the installation platform, the optical fiber installation assembly is installed on the moving mechanism, the moving mechanism has a first adjustment stroke and a second adjustment stroke perpendicular to each other on a horizontal plane, and a third adjustment stroke arranged in a vertical direction, the first adjustment stroke is arranged parallel to the axis of the transmission hole; An optical target assembly, comprising a driving assembly and an optical target, wherein the driving assembly is arranged on a side of the aperture away from the optical fiber mounting assembly, the optical target is mounted on the driving assembly, and the optical target has a detection target surface corresponding to the aperture, a plurality of optical sensing modules are arranged on the detection target surface, and the optical target has a first position and a second position on the mounting platform, and the driving assembly is used to drive the optical target to switch between the first position and the second position; as well as, A control module, electrically connected to the driving assembly and the moving mechanism, for controlling the driving assembly and the moving mechanism to start and stop; Wherein, when the light target is located at the first position, the light target is coaxial with the transmission hole, and when the light target is located at the second position, the light target is staggered with the laser light path passing through the transmission hole.

2. The divergence angle testing device according to claim 1, characterized in that, The driving structure comprises: A mounting frame, arranged on the mounting platform; a drive motor, disposed on the mounting frame, the drive motor being electrically connected to the control module; and, A connecting arm connects the light target and the output shaft of the driving motor.

3. The divergence angle testing device according to claim 2, wherein, The mounting frame is provided with a first limit block, and when the light target moves to the first position, the connecting arm abuts against the first limit block.

4. The divergence angle testing device according to claim 1, wherein, The divergence angle testing device comprises a monitoring probe, which is used to detect abnormal laser light and is electrically connected to the control module.

5. The divergence angle testing device according to claim 1, wherein A laser power meter is arranged on the mounting platform and is located on a side of the detection target surface away from the optical fiber mounting assembly. A side of the laser power meter close to the aperture has a power meter target surface, and the power meter target surface is coaxial with the transmission hole.

6. The divergence angle testing device according to claim 5, characterized in that, The control module is electrically connected to the laser power meter, and is used to receive power data measured by the laser power meter.

7. The divergence angle testing device according to claim 1, wherein The optical fiber installation assembly includes a supporting seat and a clamping block. The supporting seat is installed on the moving mechanism. The top side of the supporting seat has a first clamping groove, which extends along the first adjustment stroke direction. The first clamping groove is used to place the optical fiber. The clamping block is arranged on the top side of the supporting seat.

8. A divergence angle testing method, based on the divergence angle testing device according to any one of claims 1 to 7, characterized in that, The divergence angle testing method comprises the following steps: Step S1: fixing the optical fiber on the optical fiber mounting assembly so that the laser module to be tested emits calibration light; Step S2: controlling the light target to move to the first position through a control module; Step S3: controlling the moving mechanism through the control module so that the optical fiber installation assembly moves along the movement and approaches the aperture, so that the calibration light emitted by the optical fiber completely passes through the transmission hole, so that the calibration light forms a calibration light spot on the detection target surface; Step S4: controlling the plurality of light sensing modules to detect the shape and size of the calibration light spot through a control module; Step S5: controlling the optical fiber installation assembly to slide along the first adjustment stroke direction through the control module, so that the calibration light spot is circular and the size of the calibration light spot is smaller than the detection target surface; Step S6: controlling the plurality of light sensing modules through a control module to measure the direction and distance of the center of the calibration light spot offset from the center of the detection target surface; Step S7: controlling the optical fiber installation assembly to move along the second adjustment stroke direction and the third adjustment stroke direction respectively through the control module, so that the emitting end of the optical fiber is coaxial with the detection target surface; Step S8: Select a repetition number, and repeat steps S5 to S7 with the repetition number; Step S9: controlling the light target to move away from the first position through a control module, so that the light target avoids the calibration light emitted by the optical fiber; Step S10: turn off the calibration light of the laser module to be tested, turn on the laser control of the laser module to be tested, so that the laser to be tested is emitted from the optical fiber end, select the power to be tested, and measure the divergence angle corresponding to the power to be tested.

9. The divergence angle test method according to claim 8, characterized in that The step S7 comprises: Step S71: obtaining, by means of a control module, an offset direction and distance of the center of the calibration light spot compared to the center of the detection target surface, so as to decompose the offset into a first offset in a positive direction along the second adjustment stroke direction and a second offset in a positive direction along the third adjustment stroke direction; Step S72: controlling the optical fiber installation assembly to move the first offset amount along the negative direction of the second adjustment stroke direction, and controlling the optical fiber installation assembly to move the second offset amount along the negative direction of the third adjustment stroke direction, through the control module.

10. The divergence angle testing method according to claim 8, characterized in that, A laser power meter is arranged on the mounting table, and the laser power meter is located on a side of the detection target surface away from the optical fiber mounting assembly. A side of the laser power meter close to the aperture has a power meter target surface, and the power meter target surface is coaxial with the transmission hole; The control module is electrically connected to the laser power meter, and the control module is used to receive power data measured by the laser power meter; The step S10 comprises: Step S101: controlling the optical target to move to a second position so that the laser irradiates the target surface of the power meter, and measuring the laser power irradiated by the laser onto the target surface of the power meter by a laser power meter; Step S102: selecting a test power, and controlling the optical fiber installation assembly to move so that the power measured by the laser power meter reaches the test power; Step S103: measuring the distance between the emitting end of the optical fiber and the dot of the transmission hole, and measuring the laser divergence angle under the test power according to the aperture of the transmission hole.

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