CN113074912B - Device and method for detecting divergence angle of laser - Google Patents
Device and method for detecting divergence angle of laser Download PDFInfo
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- CN113074912B CN113074912B CN202110327894.5A CN202110327894A CN113074912B CN 113074912 B CN113074912 B CN 113074912B CN 202110327894 A CN202110327894 A CN 202110327894A CN 113074912 B CN113074912 B CN 113074912B
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- 239000013307 optical fiber Substances 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 30
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- 238000005259 measurement Methods 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 4
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- 230000005855 radiation Effects 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention belongs to the technical field of lasers, and particularly relates to a device and a method for detecting a divergence angle of a laser. The device comprises a base, a power receiver, a motor screw rod assembly, a diaphragm assembly, a sealing box body and an optical fiber connector; the diaphragm assembly is arranged on the motor screw rod assembly, and the motor screw rod assembly can drive the diaphragm assembly to move back and forth on the motor screw rod assembly; the optical fiber connector and the power receiver are respectively positioned at two sides of the diaphragm assembly, and the optical fiber connector, the diaphragm assembly and the power receiver are positioned on the same optical axis; the power receiver, the diaphragm assembly and the optical fiber connector are all positioned in the sealed box body, and the sealed box and the motor screw rod assembly are fixed on the base. When the divergence angle detection device of the laser provided by the invention is used for measuring the divergence angle, the method is simple, the operation is convenient, the calculation formula is simple, and the measurement result is accurate.
Description
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a device and a method for detecting a divergence angle of a laser.
Background
Lasers have been increasingly used in industry, medical, commercial, scientific, information, military, etc. areas since their discovery in the 20 th century, with industrial applications being the most widespread. In industrial application, the laser is used as a basic device for emitting laser, and the performance and stability of the laser are important, so that the process and the product quality of the back-end industrial processing are affected.
In high-power laser applications, the outgoing laser light of a general laser is incident into a receiving device through an optical fiber or other transmission facilities at a certain angle (divergence angle), and the receiving device performs collimation, focusing, spot-changing and other shaping on the beam of the outgoing laser light of the laser to achieve the beam of processing requirements. The premise of shaping the beam of the emergent laser by the receiving device is that the divergence angle of the emergent laser of the laser is stable and consistent, otherwise, the subsequent shaping possibly has a series of problems of insufficient adjusting range, laser beam exceeding the range of the receiving device, poor processing after shaping and the like. The stability and consistency of the laser divergence angle is very important.
Along with the breaking of the technical barriers, manufacturers of lasers are increased rapidly, the industry standard is different, the quality is uneven, the lasers of the same specification and different manufacturers have different divergence angles; the situation that the divergence angles of lasers of different batches are different exists in the same manufacturer; even in the case of lasers of the same batch from the same manufacturer, the final divergence angle is different due to mass or element differences. If there is no effective detection means for the divergence angle of the laser on the laser source head, various problems in the market application process cannot be rapidly and effectively judged and examined at all. Most of the current devices for detecting the divergence angle of a laser stay in a laboratory stage and cannot be applied to industrial sites. In field inspection applications, devices that can detect the divergence angle of a laser remain blank.
Disclosure of Invention
The invention aims to overcome at least one defect in the prior art, and provides a device and a method for detecting the divergence angle of a laser, which can realize the on-site detection of the divergence angle of the laser and have simple and reliable detection method.
In order to solve the technical problems, the invention adopts the following technical scheme: a laser divergence angle detection device comprises a base, a power receiver, a motor screw rod assembly, a diaphragm assembly, a sealing box body and an optical fiber connector; the diaphragm assembly is arranged on the motor screw rod assembly, and the motor screw rod assembly can drive the diaphragm assembly to move back and forth on the motor screw rod assembly; the optical fiber connector and the power receiver are respectively positioned at two sides of the diaphragm assembly, and the optical fiber connector, the diaphragm assembly and the power receiver are positioned on the same optical axis; the power receiver, the diaphragm assembly and the optical fiber connector are all positioned in the sealing box body, and the sealing box and the motor screw rod assembly are fixed on the base.
In one embodiment, the motor screw rod assembly comprises at least two guide rails, a sliding block, a driving motor, a mounting seat, a screw rod nut and a bearing seat; the two guide rails are fixed on the base in parallel, and a sliding block is slidably arranged on each guide rail; the two ends of the screw rod are respectively connected with the bearing seat in a rotating way through a nut seat, and an output shaft of the driving motor is connected with one end of the screw rod through a coupler so as to drive the screw rod to rotate; the screw rod nut is sleeved on the screw rod and is in threaded connection with the screw rod; the screw rod is positioned between the two guide rails, two ends of the bottom of the mounting seat are respectively connected with the two sliding blocks, the bottom of the mounting seat is also connected with the screw rod nut, and the diaphragm assembly is detachably arranged on the mounting seat.
In one embodiment, a positioning hole for positioning the mounting position of the diaphragm assembly is formed in the mounting seat; the mounting seat is also provided with a pointer.
In one embodiment, the diaphragm assembly comprises a diaphragm and a diaphragm seat; the diaphragm seat is provided with a mounting through hole, and the diaphragm is hermetically arranged in the mounting through hole; the diaphragm seat is detachably arranged on the mounting seat.
In one embodiment, a first channel and a second channel which are communicated with each other and are coaxially arranged are arranged in the diaphragm; the first channel and the second channel are both in a truncated cone-shaped structure, one end of the first channel with a larger aperture is connected with one end of the second channel with a smaller aperture through a circular connecting plate, and a circular boss is formed at the connection position; the minimum diameter value of the first channel is A1, and the maximum diameter value of the first channel is A2; the minimum diameter value of the second channel is B1, and the maximum diameter value is B2.
In one embodiment, a cooling pipe is arranged in the diaphragm seat, the cooling pipe is coiled around the mounting through hole, a water inlet joint and a water outlet joint are arranged on the diaphragm seat, and the water inlet joint and the water outlet joint are respectively connected with two ends of the cooling pipe; the outside of the diaphragm seat is also surrounded with a protective baffle.
In one embodiment, the bottom of the diaphragm seat is provided with a U-shaped clamping groove, through holes are formed in the side walls of the two sides of the U-shaped clamping groove, and a plunger is movably arranged in the through holes; the diaphragm seat is clamped at the top of the mounting seat through the U-shaped clamping groove, limiting guide grooves are formed in the side walls of the two sides of the mounting seat, and the plunger extends into the limiting guide grooves.
In one embodiment, the sealed box body is a box body structure formed by a bottom plate, a top plate, a left side plate, a right side plate, a front side plate and a rear side plate; the left side plate, the right side plate and the top plate are respectively provided with an observation window, and the observation windows are provided with transparent protection plates capable of preventing laser radiation; the front side plate is provided with a first mounting hole, and the optical fiber connector is arranged in the first mounting hole; the rear side plate is provided with a second mounting hole, a first sleeve is fixedly connected in the second mounting hole, a second sleeve is connected with the first sleeve in a threaded manner, and the power receiver is mounted in the second sleeve.
In one embodiment, the first sleeve is in sealing connection with the second mounting hole through a sealing sleeve, and the second sleeve is in sealing connection with the first sleeve through a sealing sleeve; the top plate is also provided with a wall-penetrating water joint.
The invention also provides a laser divergence angle detection method, which uses the laser divergence angle detection device, and comprises the following steps:
s1, designing the size of a diaphragm according to the minimum distance value and the maximum distance value of the diaphragm and an optical fiber joint in a laser divergence angle detection device, namely determining the values of A1, A2, B1 and B2 and the structural size of a circular connecting plate so that laser light striking the circular connecting plate is totally reflected to the periphery, and reflected light cannot enter the end face of an optical fiber;
s2, connecting the laser with the optical fiber connector, mounting the diaphragm on the mounting seat through the diaphragm seat, and enabling the first channel to face the optical fiber connector and the second channel to face the power receiver; setting an initial distance L between the optical fiber connector and the diaphragm, when the distance L between the diaphragm and the optical fiber connector is set, the diaphragm does not shield laser emitted from the optical fiber connector, at the moment, the power which can be detected by the power receiver is the power containing all light beams, and the power at the moment is recorded as Z;
s3, starting a driving motor, slowly adjusting the screw rod to rotate so as to enable the diaphragm to slowly move in a direction away from the optical fiber connector, observing the real-time power change condition of the power receiver, and in the process of moving the diaphragm, part of laser is beaten on the annular connecting plate, and is reflected to the side wall of the first channel through the annular connecting plate, so that reflected laser is prevented from entering the end face of the optical fiber, influencing the measuring result and causing burn to the end face of the optical fiber;
when the value of the power receiver is reduced from Z to the set threshold value N% X Z, 95 < N < 100, the sampling point is reached, the displacement X of the diaphragm at the moment is recorded, and the divergence angle alpha 1 is calculated by the following formula: α1=2×arctan (B1/(2×l+2x));
s3, repeating the step S2, calculating to obtain values of a plurality of groups of divergence angles, and taking an average value as a final laser divergence angle.
Compared with the prior art, the beneficial effects are that: according to the device and the method for detecting the divergence angle of the laser, provided by the invention, the detection of the divergence angle is realized from a laboratory to a factory operation site through the design of the sealed box body, and the application range is wider; by the design of the diaphragm structure, the influence of reflected light in the detection process is effectively avoided, so that the detection is safer and more accurate; the diaphragm assembly and the mounting seat can be rapidly positioned and mounted through the U-shaped clamping groove and the positioning hole, so that the diaphragm assembly can be conveniently replaced, and a larger divergence angle detection range can be obtained; when the divergence angle detection device of the laser provided by the invention is used for measuring the divergence angle, the method is simple, the operation is convenient, the calculation formula is simple, and the measurement result is accurate.
Drawings
Fig. 1 is a schematic view of the overall structure of the laser divergence angle detection apparatus of the present invention.
Fig. 2 is a schematic diagram of the motor lead screw assembly structure of the invention.
Fig. 3 is a schematic view of the structure of the mounting base of the present invention.
Fig. 4 is a schematic view of the diaphragm assembly of the present invention.
Fig. 5 is a schematic view of the structure of the diaphragm of the present invention.
Fig. 6 is a cross-sectional view of A-A of fig. 5 in accordance with the present invention.
FIG. 7 is a schematic view of the seal box structure of the present invention.
Fig. 8 is a schematic view of the detection range of the divergence angle in embodiment 2 of the present invention.
Fig. 9 is a schematic diagram of the invention reflecting laser light through a circular ring shaped web.
Fig. 10 is an enlarged partial schematic view of E of fig. 9 in accordance with the present invention.
Fig. 11 is a schematic view of laser irradiation at the time of divergence angle detection of the present invention.
Fig. 12 is an enlarged partial schematic view of F of fig. 11 in accordance with the present invention.
Reference numerals: 1. a power receiver; 2. a motor screw assembly; 201. a guide rail; 202. a slide block; 203. A driving motor; 204. a mounting base; 205. a screw rod; 206. a screw nut; 207. a bearing seat; 208. a nut seat; 209. a coupling; 210. a pointer; 241. a limiting guide groove; 242. positioning holes; 3. a diaphragm assembly; 31. a diaphragm; 32. a diaphragm seat; 321. a water inlet joint; 322. a water outlet joint; 323. a U-shaped clamping groove; 324. A plunger; 325. a protective baffle; 311. a first channel; 312. a second channel; 313. a circular connecting plate; 4. sealing the box body; 401. a bottom plate; 402. a top plate; 403. a left side plate; 404. a right side plate; 405. a front side plate; 406. a rear side plate; 407. an observation window; 408. a first mounting hole; 409. a second mounting hole; 410. A first sleeve; 411. a second sleeve; 412. a wall penetrating water joint; 5. an optical fiber splice.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship described in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
Example 1
As shown in fig. 1, a laser divergence angle detection device comprises a base, a power receiver 1, a motor screw rod assembly 2, a diaphragm assembly 3, a sealing box 4 and an optical fiber connector 5; the diaphragm assembly 3 is arranged on the motor screw rod assembly 2, and the motor screw rod assembly 2 can drive the diaphragm assembly 3 to move back and forth on the motor screw rod assembly 2; the optical fiber connector 5 and the power receiver 1 are respectively positioned at two sides of the diaphragm assembly 3, and the optical fiber connector 5, the diaphragm assembly 3 and the power receiver 1 are positioned on the same optical axis; the power receiver 1, the diaphragm assembly 3 and the optical fiber connector 5 are all positioned inside a sealed box body 4, and the sealed box and the motor screw rod assembly 2 are fixed on a base. The laser is connected with the optical fiber connector 5 to emit laser, and the power receiver 1 can receive the laser beam and identify the power of the laser beam; the motor screw rod assembly 2 can drive the diaphragm assembly 3 to move, so that the critical value of the divergence angle of the laser beam is identified; all laser detection works are carried out in a sealed environment through the design of the sealed box body 4, so that the device can be used even in the production field under the condition that dust exists in the air. The fiber optic connector 5 may be QBH, QD, q+, etc.
In one embodiment, as shown in fig. 2, the motor lead screw assembly 2 includes at least two guide rails 201, a slider 202, a drive motor 203, a mount 204, a lead screw 205, a lead screw nut 206, and a bearing housing 207; two guide rails 201 are fixed on the base in parallel, and a sliding block 202 is slidably arranged on each guide rail 201; two ends of the screw rod 205 are respectively connected with the bearing seat 207 in a rotating way through the nut seat 208, and an output shaft of the driving motor is connected with one end of the screw rod 205 through the coupler 209, so that the screw rod 205 can be driven to rotate; the screw nut 206 is sleeved on the screw rod 205 and is in threaded connection with the screw rod 205; the lead screw 205 is located the position between two guide rails 201, and the bottom both ends of mount pad 204 are connected with two sliders 202 respectively, and the bottom of mount pad 204 still is connected with screw nut 206, and diaphragm subassembly 3 demountable installation is on mount pad 204. The driving motor 203 is started, the driving screw rod 205 is rotated, the screw rod 205 is rotated to drive the screw rod nut 206 to move along the screw rod 205, the installation seat 204 is installed on the screw rod nut 206 and is connected with the sliding block 202, so that the screw rod nut 206 drives the installation seat 204 to move together when moving, and the sliding block 202 and the guide rail 201 can be arranged to avoid the installation seat 204 from shaking, so that the movement is more stable.
In another embodiment, as shown in fig. 3, a positioning hole 242 for positioning the mounting position of the diaphragm assembly 3 is provided on the mounting seat 204; the mounting base 204 is also provided with a pointer 210. Positioning holes 242 are provided to facilitate quick positioning when the diaphragm assembly 3 is installed; a pointer 210 is provided to facilitate marking to determine the initial position of the diaphragm 31 on the lead screw 205.
In one embodiment, as shown in fig. 4 to 6, the diaphragm assembly 3 includes a diaphragm 31, a diaphragm seat 32; a mounting through hole is arranged on the diaphragm seat 32, and the diaphragm 31 is hermetically arranged in the mounting through hole; the diaphragm mount 32 is detachably mounted on the mount 204.
In one of the embodiments, as shown in fig. 6, a first passage 311 and a second passage 312 which are communicated with each other and coaxially arranged are provided inside the diaphragm 31; the first channel 311 and the second channel 312 are in a truncated cone-shaped structure, one end of the first channel 311 with a larger aperture is connected with one end of the second channel 312 with a smaller aperture through a circular connecting plate 313, and a circular boss is formed at the connection position; the first passage 311 has a minimum diameter value of A1 and a maximum diameter value of A2; the second channel 312 has a minimum diameter value B1 and a maximum diameter value B2. The annular connecting plate 313 serves to connect the first channel 311 and the second channel 312 with different aperture sizes, and to reflect laser light to avoid reflected light from reflecting to the emitting point of the laser light and affecting the measurement result.
In one embodiment, as shown in fig. 4, a cooling pipe is arranged inside the diaphragm seat 32, the cooling pipe is coiled around the mounting through hole, a water inlet joint 321 and a water outlet joint 322 are arranged on the diaphragm seat 32, and the water inlet joint 321 and the water outlet joint 322 are respectively connected with two ends of the cooling pipe; a protective baffle 325 is also provided around the diaphragm seat 32. The diaphragm 31 may be cooled by a cooling water pipe.
In one embodiment, as shown in fig. 4, a U-shaped clamping groove 323 is arranged at the bottom of the diaphragm seat 32, through holes are arranged on the side walls of two sides of the U-shaped clamping groove 323, and a plunger 324 is movably arranged in the through holes; the diaphragm seat 32 is clamped at the top of the mounting seat 204 through a U-shaped clamping groove 323, limiting guide grooves 241 are formed in the side walls of the two sides of the mounting seat 204, and the plunger 324 extends into the limiting guide grooves 241. The diaphragm seat 32 can be rapidly positioned and installed through the U-shaped clamping groove 323, and the plunger 324 is matched with the limiting guide groove 241 to realize limiting and fixing of the diaphragm seat 32.
In one embodiment, as shown in fig. 7, the sealed box 4 is a box structure composed of a bottom plate 401, a top plate 402, a left side plate 403, a right side plate 404, a front side plate 405, and a rear side plate 406; the left side plate 403, the right side plate 404 and the top plate 402 are respectively provided with an observation window 407, and the observation windows 407 are provided with transparent protection plates capable of preventing laser radiation; a first mounting hole 408 is formed in the front side plate 405, and the optical fiber connector 5 is mounted in the first mounting hole 408; the rear side plate 406 is provided with a second mounting hole 409, a first sleeve 410 is fixedly connected to the second mounting hole 409, a second sleeve 411 is screwed to the first sleeve 410, and the power receiver 1 is mounted in the second sleeve 411. The first sleeve 410 and the second sleeve 411 are screwed, and fine adjustment of the position of the power receiver 1 can be achieved by rotating the second sleeve 411.
In one embodiment, the first sleeve 410 is sealingly connected to the second mounting hole 409 by a sealing sleeve, and the second sleeve 411 is sealingly connected to the first sleeve 410 by a sealing sleeve; a through-wall water connector 412 is also provided on the top plate 402. The through-wall water joint 412 has one end for externally connecting a cooling device and the other end for communicating with a cooling pipe.
Example 2
As shown in fig. 8 to 12, the present embodiment provides a laser divergence angle detection method using the laser divergence angle detection apparatus described in embodiment 1, comprising the steps of:
s1, designing the size of the diaphragm 31 according to the minimum distance value and the maximum distance value between the diaphragm 31 and the optical fiber connector 5 in the laser divergence angle detection device, namely determining the values of A1, A2, B1 and B2 and the structural size of the annular connecting plate 313 so that the laser light striking the annular connecting plate 313 is totally reflected to the periphery, and the reflected light does not enter the end face of the optical fiber, as shown in fig. 9 and 10;
s2, connecting a laser with the optical fiber connector 5, mounting the diaphragm 31 on the mounting seat 204 through the diaphragm seat 32, and enabling the first channel 311 to face the optical fiber connector 5 and the second channel 312 to face the power receiver 1; as shown in fig. 8, an initial distance L between the optical fiber connector 5 and the diaphragm 31 is set, when the distance L between the diaphragm 31 and the optical fiber connector 5 is set, the diaphragm 31 does not block the laser light emitted from the optical fiber connector 5, and at this time, the power which can be detected by the power receiver 1 is the power containing all the light beams, and the power at this time is recorded as Z;
s3, starting a driving motor 203, slowly adjusting the rotation of a screw rod 205 to enable a diaphragm 31 to slowly move in a direction away from an optical fiber connector 5, observing the real-time power change condition of a power receiver 1, and in the process of moving the diaphragm 31, part of laser is beaten on a circular connecting plate 313, and is reflected to the side wall of a first channel 311 through the circular connecting plate 313, so that reflected laser is prevented from entering an optical fiber end face, the measurement result is prevented from being influenced, and the optical fiber end face is prevented from being burnt;
when the value of the power receiver 1 decreases from Z to the set threshold value N% X Z, 95 < N < 100, the sampling point is reached, the displacement X of the diaphragm 31 at this time is recorded, and the divergence angle α1 is calculated by: α1=2×arctan (B1/(2×l+2x)); n may be set to 97 or 98.
S3, repeating the step S2, calculating to obtain values of a plurality of groups of divergence angles, and taking an average value as a final laser divergence angle.
The movement stroke of the diaphragm 31 can be designed to be 100mm according to requirements, the movement stroke is set to be 100mm, the volume of the whole device can be reduced, the device is convenient to carry and field operation, and the distance between the starting point position of the diaphragm 31 and the outgoing light is 70mm, and the maximum distance is 170mm. Thus, the range of divergence angle detected by the device can be calculated as: 2x arctan (B1/(2 x 70)). The size of B1 can be changed according to actual requirements, so that the detection of divergence angles in different ranges is realized.
As shown in fig. 9 and 10, through the design of the first channel 311, the second channel 312 and the annular connecting plate 313, the protection design in the detection process is realized, the incident light strikes at the seam allowance position at the joint of the second channel 312 and the first channel 311, is blocked by the annular connecting plate 313, is reflected to the side wall of the first channel 311, avoids direct reflection and enters the light outlet point, is basically absorbed after multiple reflections, and has negligible influence on the light outlet point. Different levels of protection can be achieved by changing the dimensions of A1 and A2.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The laser divergence angle detection device is characterized by comprising a base, a power receiver (1), a motor screw rod assembly (2), a diaphragm assembly (3), a sealing box body (4) and an optical fiber connector (5); the diaphragm assembly (3) is arranged on the motor screw rod assembly (2), and the motor screw rod assembly (2) can drive the diaphragm assembly (3) to move back and forth on the motor screw rod assembly (2); the optical fiber connector (5) and the power receiver (1) are respectively positioned at two sides of the diaphragm assembly (3), and the optical fiber connector (5), the diaphragm assembly (3) and the power receiver (1) are positioned on the same optical axis; the power receiver (1), the diaphragm assembly (3) and the optical fiber connector (5) are all positioned in the sealing box body (4), and the sealing box body (4) and the motor screw rod assembly (2) are fixed on the base; the diaphragm assembly (3) comprises a diaphragm (31) and a diaphragm seat (32); the diaphragm seat (32) is provided with a mounting through hole, and the diaphragm (31) is hermetically arranged in the mounting through hole; the diaphragm seat (32) is detachably arranged on the mounting seat (204); a first channel (311) and a second channel (312) which are communicated with each other and coaxially arranged are arranged in the diaphragm (31); the first channel (311) and the second channel (312) are in a truncated cone-shaped structure, one end of the first channel (311) with larger aperture is connected with one end of the second channel (312) with smaller aperture through a circular connecting plate (313), and a circular boss is formed at the connection part; the minimum diameter value of the first channel (311) is A1, and the maximum diameter value is A2; the minimum diameter value of the second channel (312) is B1, and the maximum diameter value is B2; the annular connecting plate (313) plays a role in reflecting laser, and avoids reflected light from reflecting to an emitting point of the laser.
2. The laser divergence angle detection device according to claim 1, wherein the motor lead screw assembly (2) comprises at least two guide rails (201), a slider (202), a driving motor (203), a mounting seat (204), a lead screw (205), a lead screw nut (206), and a bearing seat (207); the two guide rails (201) are fixed on the base in parallel, and a sliding block (202) is slidably arranged on each guide rail (201); the two ends of the screw rod (205) are respectively connected with the bearing seat (207) in a rotating way through the nut seat (208), and an output shaft of the driving motor (203) is connected with one end of the screw rod (205) through the coupler (209) so as to drive the screw rod (205) to rotate; the screw rod nut (206) is sleeved on the screw rod (205) and is in threaded connection with the screw rod (205); the diaphragm assembly is characterized in that the screw rod (205) is positioned between the two guide rails (201), two ends of the bottom of the mounting seat (204) are respectively connected with the two sliding blocks (202), the bottom of the mounting seat (204) is also connected with the screw rod nut (206), and the diaphragm assembly (3) is detachably arranged on the mounting seat (204).
3. The device for detecting the divergence angle of the laser according to claim 2, wherein a positioning hole (242) for positioning the mounting position of the diaphragm assembly (3) is formed in the mounting base (204); and a pointer (210) is also arranged on the mounting seat (204).
4. The laser divergence angle detection device according to claim 2, wherein a cooling pipe is arranged in the diaphragm seat (32), the cooling pipe is coiled around the installation through hole, a water inlet joint (321) and a water outlet joint (322) are arranged on the diaphragm seat (32), and the water inlet joint (321) and the water outlet joint (322) are respectively connected with two ends of the cooling pipe; a protective baffle (325) is also arranged outside the diaphragm seat (32).
5. The device for detecting the divergence angle of the laser according to claim 2, wherein a U-shaped clamping groove (323) is arranged at the bottom of the diaphragm seat (32), through holes are formed in the side walls of the two sides of the U-shaped clamping groove (323), and a plunger (324) is movably arranged in the through holes; the diaphragm seat (32) is clamped at the top of the mounting seat (204) through the U-shaped clamping groove (323), limiting guide grooves (241) are formed in the side walls of the two sides of the mounting seat (204), and the plunger (324) extends into the limiting guide grooves (241).
6. The laser divergence angle detection apparatus as claimed in any one of claims 2 to 5, wherein the sealed case (4) has a case structure composed of a bottom plate (401), a top plate (402), a left side plate (403), a right side plate (404), a front side plate (405), and a rear side plate (406); the left side plate (403), the right side plate (404) and the top plate (402) are provided with observation windows (407), and the observation windows (407) are provided with transparent protection plates capable of preventing laser radiation; a first mounting hole (408) is formed in the front side plate (405), and the optical fiber connector (5) is mounted in the first mounting hole (408); the rear side plate (406) is provided with a second mounting hole (409), a first sleeve (410) is fixedly connected in the second mounting hole (409), a second sleeve (411) is connected with the first sleeve (410) in a threaded manner, and the power receiver (1) is mounted in the second sleeve (411).
7. The device for detecting a divergence angle of a laser according to claim 6, wherein the first sleeve (410) is sealingly connected to the second mounting hole (409) through a sealing sleeve, and the second sleeve (411) is sealingly connected to the first sleeve (410) through a sealing sleeve; the top plate (402) is also provided with a through-wall water joint (412).
8. A laser divergence angle detection method, characterized by using the laser divergence angle detection apparatus as claimed in any one of claims 2 to 7, comprising the steps of:
s1, designing the size of a diaphragm (31) according to the minimum distance value and the maximum distance value of the diaphragm (31) and an optical fiber connector (5) in a laser divergence angle detection device, namely determining the values of A1, A2, B1 and B2 and the structural size of a circular connecting plate (313) so that laser light striking the circular connecting plate (313) is totally reflected to the periphery, and reflected light cannot enter the end face of an optical fiber;
s2, connecting the laser with the optical fiber connector (5), mounting the diaphragm (31) on the mounting seat (204) through the diaphragm seat (32), and enabling the first channel (311) to face the optical fiber connector (5) and the second channel (312) to face the power receiver (1); setting an initial distance L between the optical fiber connector (5) and the diaphragm (31), when the distance L between the diaphragm (31) and the optical fiber connector (5) is set, the diaphragm (31) does not shield the laser emitted from the optical fiber connector (5), at the moment, the power which can be detected by the power receiver (1) is the power containing all light beams, and the power at the moment is recorded as Z;
s3, starting a driving motor (203), slowly adjusting the rotation of a screw rod (205) to enable a diaphragm (31) to slowly move in a direction away from an optical fiber connector (5), observing the real-time power change condition of a power receiver (1), and in the process of moving the diaphragm (31), part of laser is beaten on a circular connecting plate (313), and is reflected to the side wall of a first channel (311) through the circular connecting plate (313), so that reflected laser is prevented from entering an optical fiber end surface, the measurement result is prevented from being influenced, and the optical fiber end surface is prevented from being burnt;
when the value of the power receiver (1) is reduced from Z to a set threshold value N% X Z, 95 < N < 100, a sampling point is reached, the displacement X of the diaphragm (31) at the moment is recorded, and the divergence angle alpha 1 is calculated by the following formula: α1=2×arctan (B1/(2×l+2x));
s4, repeating the step S2, calculating to obtain values of a plurality of groups of divergence angles, and taking an average value as a final laser divergence angle.
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| CN111122127A (en) * | 2020-03-12 | 2020-05-08 | 佛山市宏石激光技术有限公司 | Method for measuring laser divergence angle |
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| US5430816A (en) * | 1992-10-27 | 1995-07-04 | Matsushita Electric Industrial Co., Ltd. | Multiple split-beam laser processing apparatus generating an array of focused beams |
| US6377410B1 (en) * | 1999-10-01 | 2002-04-23 | Apollo Instruments, Inc. | Optical coupling system for a high-power diode-pumped solid state laser |
| CN101281058A (en) * | 2008-05-12 | 2008-10-08 | 中国科学院安徽光学精密机械研究所 | Laser power dynamic calibration apparatus |
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