CN113074912A - Laser divergence angle detection device and method - Google Patents
Laser divergence angle detection device and method Download PDFInfo
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- CN113074912A CN113074912A CN202110327894.5A CN202110327894A CN113074912A CN 113074912 A CN113074912 A CN 113074912A CN 202110327894 A CN202110327894 A CN 202110327894A CN 113074912 A CN113074912 A CN 113074912A
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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 lead screw assembly, and the motor lead screw assembly can drive the diaphragm assembly to move back and forth on the motor lead screw assembly; the optical fiber connector and the power receiver are respectively positioned on 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 located inside the sealing box body, and the sealing box and the motor screw rod assembly are fixed on the base. When the laser divergence angle detection device provided by the invention is used for divergence angle measurement, 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
Since the discovery of the 20 th century, lasers have gradually entered the fields of industry, medicine, commerce, research, information, and military, among which industrial applications are the most widespread. In industrial application, the performance and stability of a laser as a basic device for emitting laser are very important, and the process and the product quality of the back-end industrial processing are influenced.
In high-power laser applications, the laser beam emitted from a general laser enters a receiving device at a certain angle (divergence angle) through an optical fiber or other transmission facilities, and the receiving device shapes the laser beam emitted from the laser by collimating, focusing, spot-changing and the like, so as to achieve the beam required for processing. The premise that the receiving device shapes the laser beam is that the divergence angle of the laser beam emitted by the laser is stable and consistent, otherwise, the subsequent shaping may have a series of problems such as insufficient adjustment range, laser beam exceeding the range of the receiving device, poor processing after shaping and the like. Stability and uniformity of the laser divergence angle is very important.
With the breaking of the technical barrier, the manufacturers of the laser are increased rapidly, the standards in the industry are different, the quality is different, the laser with the same specification is different in divergence angle in different manufacturers; the same manufacturer has the condition of different laser divergence angles in different batches; even the final divergence angle of the same batch of lasers from the same manufacturer is different due to quality or component differences. If no effective detection means for the divergence angle of the laser is available on the laser source head, various problems occurring in the market application process cannot be judged and investigated quickly and effectively. Most of the existing devices for detecting the divergence angle of the laser stay in a laboratory stage and cannot be applied to an industrial field. In the processing field detection application, equipment for detecting the divergence angle of the laser is still blank.
Disclosure of Invention
In order to overcome at least one defect in the prior art, the invention provides the device and the method for detecting the divergence angle of the laser, which can realize the field 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 technical scheme that: 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 located inside 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 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 each guide rail is provided with a sliding block in a sliding manner; two ends of the screw rod are respectively connected with the bearing seat in a rotating way through the nut seat, and an output shaft of the driving motor is connected with one end of the screw rod through a coupling and can 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 lead screw is located 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 further connected with a lead screw nut, and the diaphragm assembly is detachably mounted on the mounting seat.
In one embodiment, a positioning hole for positioning the mounting position of the diaphragm assembly is arranged on the mounting seat; and a pointer is also arranged on the mounting seat.
In one embodiment, the diaphragm assembly comprises a diaphragm and a diaphragm seat; the diaphragm seat is provided with an installation through hole, and the diaphragm is hermetically arranged in the installation 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 coaxially arranged are arranged in the diaphragm; the first channel and the second channel are both in a round table structure, the end with the larger aperture of the first channel is connected with the end with the smaller aperture of the second channel through a circular connecting plate, and a circular boss is formed at the joint; the minimum diameter value of the first channel is A1, and the maximum diameter value 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 wound around the installation 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; and a protective baffle is arranged outside the diaphragm seat in an enclosing manner.
In one embodiment, the bottom of the diaphragm seat is provided with a U-shaped clamping groove, the side walls of the two sides of the U-shaped clamping groove are provided with through holes, and a plunger is movably arranged in the through holes; the diaphragm seat locate the top of mount pad through the card of U-shaped draw-in groove, the both sides lateral wall of mount pad on be equipped with spacing guide slot, the plunger stretch into in the spacing guide slot.
In one embodiment, the sealed box body is a box body structure consisting of 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 all provided with observation windows, 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 mounted 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 in threaded connection with the first sleeve, and the power receiver is mounted in the second sleeve.
In one embodiment, the first sleeve is connected with the second mounting hole in a sealing mode through a sealing sleeve, and the second sleeve is connected with the first sleeve in a sealing mode through the sealing sleeve; and a wall-through water joint is also arranged on the top plate.
The invention also provides a laser divergence angle detection method, which uses the laser divergence angle detection device and comprises the following steps:
s1, according to the minimum distance value and the maximum distance value between a diaphragm and an optical fiber connector in a laser divergence angle detection device, designing the size of the diaphragm, namely determining the values of A1, A2, B1 and B2 and the structural size of a circular connecting plate, so that all laser on the circular connecting plate is reflected to the periphery, and reflected light cannot enter the end face of the optical fiber;
s2, connecting a laser with an optical fiber connector, installing a diaphragm on an installation seat through a diaphragm seat, and enabling a first channel to face the optical fiber connector and a second channel to face a power receiver; setting an initial distance L between the optical fiber connector and the diaphragm, wherein when the distance between the diaphragm and the optical fiber connector is L, the diaphragm does not shield laser emitted from the optical fiber connector, the power which can be detected by the power receiver at this moment is the power containing all light beams, and the power at this 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 towards the direction far away from the optical fiber connector, and observing the real-time power change condition of the power receiver;
when the value of the power receiver is reduced from Z to the set threshold value N% multiplied by Z, 95 < N < 100, then a 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: α 1 is 2 × arctan (B1/(2 × L +2 x));
and S3, repeating the step S2, calculating to obtain a plurality of groups of divergence angle values, and taking an average value as a final laser divergence angle.
Compared with the prior art, the beneficial effects are: according to the device and the method for detecting the divergence angle of the laser, the divergence angle is detected from a laboratory to a factory operation field through the design of the sealed box body, and the application range is wider; by designing 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 quickly positioned and mounted through the U-shaped clamping groove and the positioning hole, so that the diaphragm assembly is convenient to replace, and a larger divergence angle detection range is obtained; when the laser divergence angle detection device provided by the invention is used for divergence angle measurement, 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 structural diagram of the motor screw rod assembly of the present invention.
Fig. 3 is a schematic view of the structure of the mounting seat of the present invention.
FIG. 4 is a schematic view of the structure of the diaphragm assembly of the present invention.
FIG. 5 is a schematic diagram of the structure of the diaphragm of the present invention.
Fig. 6 is a cross-sectional view a-a of fig. 5 of the present invention.
Fig. 7 is a schematic structural diagram of the sealed box body of the 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 principle of the invention of reflecting laser light through a circular ring-shaped connecting plate.
Fig. 10 is an enlarged partial view of E of fig. 9 according to the present invention.
Fig. 11 is a schematic view of laser irradiation at the time of detection of the divergence angle in the present invention.
Fig. 12 is an enlarged partial view of F of fig. 11 in accordance with the present invention.
Reference numerals: 1. a power receiver; 2. a motor lead screw assembly; 201. a guide rail; 202. a slider; 203. A drive motor; 204. a mounting seat; 205. a screw rod; 206. a feed 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 base 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 illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted 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 includes a base, a power receiver 1, a motor screw assembly 2, a diaphragm assembly 3, a sealed 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 located inside the sealing box body 4, and the sealing box and the motor screw rod assembly 2 are fixed on the base. The laser is connected with the optical fiber connector 5 to realize the emission of laser, and the power receiver 1 can receive laser beams and identify the power of the laser beams; 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 work is carried out under the sealed environment through the design of sealed box 4, can guarantee even in the production site, also can use under the condition that has the dust in the air. The optical fiber connector 5 may be QBH, QD, Q +, etc.
In one embodiment, as shown in fig. 2, the motor screw assembly 2 includes at least two guide rails 201, a slider 202, a driving motor 203, a mounting seat 204, a screw 205, a screw nut 206, and a bearing seat 207; the two guide rails 201 are fixed on the base in parallel, and each guide rail 201 is provided with a sliding block 202 in a sliding manner; two ends of the screw 205 are respectively connected with the bearing seat 207 through the nut seat 208 in a rotating way, and an output shaft of the driving motor is connected with one end of the screw 205 through the coupling 209 and can drive the screw 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 screw 205 is located between the two guide rails 201, two ends of the bottom of the mounting base 204 are respectively connected with the two sliders 202, the bottom of the mounting base 204 is further connected with the screw nut 206, and the diaphragm assembly 3 is detachably mounted on the mounting base 204. The driving motor 203 starts, drives the lead screw 205 to rotate, thereby the lead screw 205 rotates and drives the screw nut 206 to move along the lead screw 205, the mounting seat 204 is installed on the screw nut 206 and is connected with the slider 202, like this, the screw nut 206 drives the mounting seat 204 to move together when moving, the setting of the slider 202 and the guide rail 201 can avoid the mounting seat 204 to rock, and 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 base 204; the mounting base 204 is also provided with a pointer 210. The positioning hole 242 is provided to facilitate quick positioning when the diaphragm assembly 3 is installed; a pointer 210 is provided for 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; the diaphragm seat 32 is provided with an installation through hole, and the diaphragm 31 is hermetically installed in the installation through hole; the diaphragm mount 32 is detachably mounted on the mount 204.
In one embodiment, as shown in fig. 6, the diaphragm 31 is internally provided with a first channel 311 and a second channel 312 which are communicated with each other and coaxially arranged; the first channel 311 and the second channel 312 are both in a round platform structure, the larger aperture end of the first channel 311 is connected with the smaller aperture end of the second channel 312 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 passage 312 has a minimum diameter value of B1 and a maximum diameter value of B2. The circular ring-shaped connecting plate 313 is used for connecting the first channel 311 and the second channel 312 with different apertures, and is used for reflecting laser light, so that reflected light is prevented from being reflected to a laser emitting point to influence a measuring result.
In one embodiment, as shown in fig. 4, a cooling pipe is disposed inside the diaphragm seat 32, the cooling pipe is wound around the installation through hole, a water inlet connector 321 and a water outlet connector 322 are disposed on the diaphragm seat 32, and the water inlet connector 321 and the water outlet connector 322 are respectively connected to two ends of the cooling pipe; a protective baffle 325 is further arranged 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 slot 323 is arranged at the bottom of the diaphragm seat 32, through holes are arranged on both side walls of the U-shaped slot 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, the side walls of the two sides of the mounting seat 204 are provided with a limiting guide groove 241, and the plunger 324 extends into the limiting guide groove 241. The rapid positioning and installation of the diaphragm seat 32 can be realized through the U-shaped clamping groove 323, and the limiting and fixing of the diaphragm seat 32 are realized through the matching of the plunger 324 and the limiting guide groove 241.
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; observation windows 407 are respectively arranged on the left side plate 403, the right side plate 404 and the top plate 402, and transparent protection plates capable of preventing laser radiation are arranged on the observation windows 407; 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; a second mounting hole 409 is formed in the rear side plate 406, a first sleeve 410 is fixedly connected in the second mounting hole 409, a second sleeve 411 is in threaded connection with 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 connected with the second mounting hole 409 in a sealing manner through a sealing sleeve, and the second sleeve 411 is connected with the first sleeve 410 in a sealing manner through a sealing sleeve; the top plate 402 is also provided with a through-wall water connection 412. One end of the through-wall water joint 412 is used for externally connecting a cooling device, and the other end of the through-wall water joint is used 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, including the steps of:
s1, according to the minimum distance value and the maximum distance value between a diaphragm 31 and an optical fiber connector 5 in a laser divergence angle detection device, designing the size of the diaphragm 31, namely determining the values of A1, A2, B1 and B2 and the structural size of a circular ring-shaped connecting plate 313, so that all laser beams striking the circular ring-shaped connecting plate 313 are reflected to the periphery, and the reflected light cannot enter the end face of an optical fiber, as shown in FIGS. 9 and 10;
s2, connecting the laser with the optical fiber connector 5, installing the diaphragm 31 on the installation base 204 through the diaphragm base 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 shield the laser emitted from the optical fiber connector 5, the power that can be detected by the power receiver 1 at this time is the power including all the light beams, and the power at this time is recorded as Z;
s3, starting the driving motor 203, slowly adjusting the screw rod 205 to rotate so as to enable the diaphragm 31 to slowly move towards the direction far away from the optical fiber connector 5, and observing the real-time power change condition of the power receiver 1;
when the value of the power receiver 1 decreases from Z to the set threshold value N% × Z, 95 < N < 100, the sample point is reached, the displacement X of the diaphragm 31 at that time is recorded, and the divergence angle α 1 is calculated by the following equation: α 1 is 2 × arctan (B1/(2 × L +2 x)); n may be set to 97 or 98.
And S3, repeating the step S2, calculating to obtain a plurality of groups of divergence angle values, 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 size of the whole device can be reduced, the device is convenient to carry and operate on site, and the distance from the starting point of the diaphragm 31 to the photoelectric device is 70mm, and the distance is 170 mm. Thus, the range of the device detection divergence angle can be calculated as: 2-octan (B1/(2-70)). gtoreq.s. divergence angle ≧ 2-octan (B1/(2-170)). The detection of different ranges of divergence angles can be realized by changing the size of the B1 according to actual requirements.
As shown in fig. 9 and 10, by the design of the first channel 311, the second channel 312 and the annular connecting plate 313, a protection design in the detection process is realized, incident light hits a 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, and is prevented from directly reflecting to enter a light exit point, the incident light is basically absorbed after being reflected for multiple times, and the influence on the light exit point can be ignored. Different levels of protection can be achieved by altering the size of a1 and a 2.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A laser divergence angle detection device is characterized by comprising a base, a power receiver (1), a motor lead screw 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 located inside the sealing box body (4), and the sealing box body (4) and the motor screw rod assembly (2) are fixed on the base.
2. The laser divergence angle detection device according to claim 1, wherein the motor-screw assembly (2) comprises at least two guide rails (201), a slider (202), a driving motor (203), a mounting seat (204), a screw (205), a 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 arranged on each guide rail (201) in a sliding mode; two ends of the screw rod (205) are respectively connected with a bearing seat (207) through a nut seat (208) in a rotating way, and an output shaft of the driving motor (203) is connected with one end of the screw rod (205) through a coupling (209) and can 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 screw rod (205) is located 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 mounted on the mounting seat (204).
3. The laser divergence angle detection apparatus according to claim 2, wherein a positioning hole (242) for positioning a mounting position of the diaphragm assembly (3) is provided on the mount base (204); and a pointer (210) is also arranged on the mounting seat (204).
4. The laser divergence angle detection apparatus according to claim 3, wherein said diaphragm assembly (3) includes a diaphragm (31), a diaphragm holder (32); the diaphragm seat (32) is provided with an installation through hole, and the diaphragm (31) is hermetically installed in the installation through hole; the diaphragm seat (32) is detachably arranged on the mounting seat (204).
5. The laser divergence angle detection apparatus according to claim 4, wherein a first channel (311) and a second channel (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 both in a round table structure, the larger aperture end of the first channel (311) is connected with the smaller aperture end of the second channel (312) 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 minimum diameter value of the second channel (312) is B1, and the maximum diameter value is B2.
6. The laser divergence angle detection device according to claim 5, wherein a cooling pipe is arranged inside the diaphragm seat (32), the cooling pipe is wound 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).
7. The laser divergence angle detection device according to claim 5, wherein a U-shaped clamping groove (323) is formed in the bottom of the diaphragm seat (32), through holes are formed in side walls of two sides of the U-shaped clamping groove (323), and a plunger (324) is movably mounted in each through hole; the diaphragm seat (32) is clamped at the top of the mounting seat (204) through a U-shaped clamping groove (323), the side walls of two sides of the mounting seat (204) are provided with limiting guide grooves (241), and the plunger (324) extends into the limiting guide grooves (241).
8. The laser divergence angle detection apparatus according to any one of claims 5 to 7, wherein the sealed case (4) has a case structure including 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); observation windows (407) are respectively arranged on the left side plate (403), the right side plate (404) and the top plate (402), and transparent protection plates capable of preventing laser radiation are arranged on the observation windows (407); 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 in threaded connection with the first sleeve (410), and the power receiver (1) is mounted in the second sleeve (411).
9. The laser divergence angle detection device according to claim 8, wherein the first sleeve (410) is hermetically connected with the second mounting hole (409) by a sealing sleeve, and the second sleeve (411) is hermetically connected with the first sleeve (410) by a sealing sleeve; and a wall-through water joint (412) is also arranged on the top plate (402).
10. A laser divergence angle detection method using the laser divergence angle detection apparatus according to any one of claims 5 to 9, comprising the steps of:
s1, according to the minimum distance value and the maximum distance value of a diaphragm (31) and an optical fiber connector (5) in a laser divergence angle detection device, designing the size of the diaphragm (31), namely determining the values of A1, A2, B1 and B2 and the structural size of a circular connecting plate (313), so that all laser beams striking the circular connecting plate (313) are reflected to the periphery, and the reflected light cannot enter the end face of the optical fiber;
s2, connecting the laser with the optical fiber connector (5), installing a diaphragm (31) on the installation base (204) through a diaphragm base (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), wherein when the distance L between the diaphragm (31) and the optical fiber connector (5) is L, the diaphragm (31) does not shield laser emitted from the optical fiber connector (5), the power which can be detected by the power receiver (1) at this moment is the power containing all light beams, and recording the power at this moment as Z;
s3, starting a driving motor (203), slowly adjusting a screw rod (205) to rotate so as to enable a diaphragm (31) to slowly move towards a direction far away from an optical fiber connector (5), and observing the real-time power change condition of a power receiver (1), wherein in the process of moving the diaphragm (31), part of laser is irradiated on a circular ring-shaped connecting plate (313), and the laser is reflected onto the side wall of a first channel (311) through the circular ring-shaped connecting plate (313), so that the reflected laser is prevented from entering the end face of the optical fiber to influence the measurement result and burn the end face of the optical fiber;
when the value of the power receiver (1) is reduced from Z to a set threshold value N% multiplied by Z, 95 < N < 100, a sampling point is reached, the displacement X of the diaphragm (31) at the time is recorded, and the divergence angle alpha 1 is calculated by the following formula: α 1 is 2 × arctan (B1/(2 × L +2 x));
and S3, repeating the step S2, calculating to obtain a plurality of groups of divergence angle values, and taking an average value as a final laser divergence angle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111556307A (en) * | 2020-05-14 | 2020-08-18 | 河海大学常州校区 | High-speed real-time structured light imaging system with adjustable laser power |
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