CN111082291B - Monitoring device for perforation and fiber laser - Google Patents
Monitoring device for perforation and fiber laser Download PDFInfo
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- CN111082291B CN111082291B CN201911134124.8A CN201911134124A CN111082291B CN 111082291 B CN111082291 B CN 111082291B CN 201911134124 A CN201911134124 A CN 201911134124A CN 111082291 B CN111082291 B CN 111082291B
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- voltage signal
- fiber laser
- stripper
- perforation
- punching
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- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 238000012806 monitoring device Methods 0.000 title claims abstract description 18
- 238000005253 cladding Methods 0.000 claims abstract description 54
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000004080 punching Methods 0.000 claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/0007—Applications not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/0014—Monitoring arrangements not otherwise provided for
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a monitoring device for perforation and a fiber laser, wherein the monitoring device comprises a first cladding light stripper, a second cladding light stripper and a first control unit, wherein the first cladding light stripper is used for stripping cladding light entering the fiber laser; the photoelectric monitor is used for monitoring the returned light stripped by the first cladding light stripper and forming a voltage signal output; the controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value or not in real time, and the controller is also used for judging that the punching work is finished and sending a feedback signal when the voltage signal is smaller than the preset threshold value. Through setting up monitoring devices in the perforation technology process, use the inside laser of photoelectric monitoring return to fiber laser to handle, and then monitor the perforation technology process, promote perforation efficiency and guarantee the perforation quality.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a monitoring device for perforation and a fiber laser.
Background
In the application of the optical fiber laser, the perforation process has wide application in the fields of perforation, cutting and the like. The current perforation process is to set the time of laser light emission through a numerical control machine. If the numerical control machine tool sets the perforation time to be too long, the perforation is finished, but the numerical control machine tool still controls the cutting head to stay at the perforation position to emit light, and the perforation efficiency is very low. If the numerical control machine tool sets the perforation time to be too short, perforation is not finished yet, but the numerical control machine tool controls the cutting head to leave the perforation position, so that the perforation quality cannot be guaranteed.
Content of application
The invention aims to provide a perforation monitoring device and an optical fiber laser, and aims to solve the problems that the perforation efficiency is low and the perforation quality cannot be guaranteed.
In order to solve the above technical problem, the present invention is a perforation monitoring device for monitoring a perforation state of a fiber laser, including:
a first cladding light stripper for stripping cladding light entering the fiber laser;
the photoelectric monitor is used for monitoring the returned light stripped by the first cladding light stripper and forming a voltage signal output;
the controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value or not in real time, and the controller is also used for judging that the punching work is finished and sending a feedback signal when the voltage signal is smaller than the preset threshold value.
Further, the preset threshold is adjusted and set according to the target perforation scene.
Further, the photoelectric monitor is arranged at the position of the target distance of the first cladding optical stripper.
In another embodiment of the application, a fiber laser for perforation, comprising a monitoring device for monitoring a state of perforation of the fiber laser, the monitoring device comprising:
a first cladding light stripper for stripping cladding light entering the fiber laser;
and the photoelectric monitor is connected with the first cladding light stripper and used for monitoring the return light stripped by the first cladding light stripper and forming a voltage signal output.
The controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value or not in real time, and the controller is also used for judging that the punching work is finished and sending a feedback signal when the voltage signal is smaller than the preset threshold value.
The laser device further comprises a second cladding light stripper, the second cladding light stripper is connected with the first cladding light stripper, and the second cladding light stripper is used for stripping cladding light in the same direction as the output direction of the laser.
Further, the second cladding light stripper and the first cladding light stripper are arranged at different positions.
Further, still include the laser module, the laser module is connected with second cladding light stripper for the transmission laser.
Furthermore, the output device comprises an absorption unit and a reflection unit, the absorption unit is connected with the reflection unit, the absorption unit is used for absorbing and returning the return light, and the reflection unit is used for reflecting the return light.
Further, a base is arranged at the bottom end of the photoelectric monitor, and the base is used for fixing the photoelectric monitor or adjusting the position of the photoelectric monitor.
Compared with the prior art, the invention has the beneficial effects that: the monitoring device comprises a first cladding light stripper for stripping the cladding light entering the optical fiber laser; the photoelectric monitor is used for monitoring the returned light stripped by the first cladding light stripper and forming a voltage signal output; the controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value or not in real time, and the controller is also used for judging that the punching work is finished and sending a feedback signal when the voltage signal is smaller than the preset threshold value. Through setting up monitoring devices in the perforation technology process, use the inside laser of photoelectric monitoring return to fiber laser to handle, and then monitor the perforation technology process, promote perforation efficiency and guarantee the perforation quality.
Drawings
Fig. 1 is a schematic structural diagram of a fiber laser for monitoring perforation according to an embodiment of the present invention.
Fig. 2 is a signal diagram of a photo monitor in a perforation monitoring process according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an output device according to an embodiment of the present invention.
In the drawings, each reference numeral denotes: 10. a fiber laser; 100. a monitoring device; 110. a photoelectric monitor; 120. a controller; 130. a first clad light stripper; 200. a second cladding light stripper; 300. a laser module; 400. an output device; 410. an absorption unit; 420. a reflection unit; 500. a surface treatment stage; 600. a piercing step; 700. a piercing completion stage; 800. the puncturing threshold is completed.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
When laser light acts on a workpiece, the laser light reflected on the workpiece is coupled into the fiber laser 10 through the output device 400, and the reflected light entering the fiber laser 10 is return light. As shown in fig. 1, a monitoring apparatus 100 for perforation for monitoring the state of perforation of a fiber laser 10 includes a first cladding light stripper 130, a photo monitor 110, and a controller 120. The first clad light stripper 130 is used to strip the clad light entering the fiber laser 10. The photodetector 110 is connected to the first cladding optical stripper 130 for monitoring the returned light passing through the first cladding optical stripper 130 and forming a voltage signal output. The controller 120 is connected to the photo monitor 110, and is configured to receive the voltage signal output by the photo monitor 110 and determine whether the voltage signal is smaller than a preset threshold in real time, and the controller 120 is further configured to determine that the punching operation is completed and send a feedback signal when the voltage signal is smaller than the preset threshold. Specifically, the preset threshold refers to the completion puncturing threshold 900.
The surface of the workpiece emits a different laser at different stages of the perforation. As shown in fig. 2, the X-axis represents time, i.e. represents the temporal course of the perforation. The Y-axis represents the voltage signal output by the photo monitor. The process of drilling can be divided into a surface treatment stage 500, a drilling stage 600 and a drilling completion stage 700 according to the intensity of the laser reflected from the surface of the workpiece. In the surface treatment stage 500, the more laser light that returns back into the fiber laser 10, because the workpiece absorbs less laser light and reflects more laser light. The time for the surface treatment stage 500 is generally short. And after finishing the surface treatment, entering a perforation stage. In the piercing step 600, the workpiece absorbs more laser light, and less laser light returns to the inside of the fiber laser 10. During the pierce completion phase 700, the laser light is transmitted through the hole of the workpiece with substantially no reflection. Further, a completion puncture threshold 800 is set. The controller 120 determines in real time whether the voltage signal is less than the complete punch threshold 800. When the voltage signal is less than the complete punch threshold 800, it is determined that the punching process is complete. After the perforation process is completed, the fiber laser 10 sends a feedback signal. The feedback signal may be a warning light or the sound of a warning. After receiving the feedback signal sent by the fiber laser 10, the numerical control machine rapidly enters the next procedure. Thereby, while guaranteeing the perforation quality, reduce the waiting time of perforation effectively and promote perforation efficiency.
Specifically, the controller 120 determines in real time whether the voltage signal is less than the complete puncturing threshold 800. The case where the voltage signal is not less than the complete puncturing threshold 800 is divided into two. One is that the voltage signal is greater than the complete puncture threshold 800. Second, the voltage signal is equal to the complete puncture threshold 800. When the voltage signal is greater than the complete puncture threshold 800, the surface treatment phase 500 and the puncture phase 600 are in place. When the voltage signal equals the complete puncture threshold 800, it is the critical point for the completion of the puncture. Further, both the workpiece material itself and the thickness of the material can affect the return light of the hole, thereby affecting the signal during the hole piercing process. It is necessary to debug the puncturing and set the completion puncturing threshold 800 according to the actual application process.
In some embodiments, the laser module 300 lases. The second cladding light stripper 200 strips the cladding light in accordance with the laser output direction. Second cladding optical stripper 200 is coupled to first cladding optical stripper 130. The first cladding light stripper 130 and the second cladding light stripper 200 separate the cladding light having the same laser output direction and the return light reflected from the surface of the workpiece in different regions inside the fiber laser 10. The first cladding light stripper 130 and the second cladding light stripper 200 are disposed at different positions, and the returned light reflected from the surface of the workpiece is isolated and monitored from the cladding light in the direction of the laser light emitted from the laser module 300. Since the cladding light that is aligned with the laser output direction and the return light reflected from the surface of the workpiece interfere with each other, the accuracy of the perforation monitoring is affected. More specifically, at least two cladding light strippers can be arranged at different positions to achieve the isolation and monitoring effects.
In some embodiments, the photodetector 110 is positioned at a target distance from the first clad optical stripper 130. The distance between the photodetector 110 and the first clad optical stripper 130 is related to the intensity of light stripped by the first clad optical stripper 130 and the damage threshold of the photodetector. The damage threshold is a light intensity value that disables the photodetector 110. The intensity of the light stripped by the first clad light stripper 130 is relatively high, and the photodetector 110 is easily damaged. When the intensity of light entering the photo detector 110 is too high, the photo detector 110 will fail. The photodetector 110 needs to be spaced from the first clad optical stripper 130 to ensure that the photodetector 110 operates properly. But the distance between the photodetector 110 and the first cladding stripper 130 cannot be too far, otherwise the optical signal is too weak, which affects the signal monitoring. A mount (not shown) is provided on the photodetector 110 to hold the photodetector 110 within the target distance of the first clad optical stripper 130. Or the position of the photo detector 110 is adjusted according to the actual situation.
In another embodiment, fibre laser 10 further comprises output means 400. The output device 400 includes an absorption unit 410 and a reflection unit 420. The output device 400 is used to isolate a portion of the return light. The reflection unit 420 is used to reflect the return light. The absorption unit 410 is used to absorb the return light. The absorption units 410 may be provided in two, and the two absorption units 410 are provided in parallel. The reflection unit 420 is disposed between the absorption units 410 parallel to each other. When part of the return light is reflected by the reflection unit 420 and then absorbed by the absorption unit 410, the effect of isolating the return light is achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A monitoring device for perforation, which is used for monitoring the perforation state of a fiber laser, and is characterized by comprising:
a first cladding light stripper for stripping cladding light entering the fiber laser;
the photoelectric monitor is used for monitoring the returned light stripped by the first cladding light stripper and forming a voltage signal output;
the controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value in real time, and the controller is also used for judging the punching working state according to the voltage signal and the preset threshold value and sending a feedback signal;
the punching working state comprises a surface processing stage, a punching critical point and a punching completion stage, wherein the punching completion stage is performed when the voltage signal is smaller than the preset threshold, the surface processing stage and the punching stage are performed when the voltage signal is larger than the preset threshold, and the punching critical point is performed when the voltage signal is equal to the preset threshold.
2. The monitoring device of claim 1, wherein the preset threshold is adjusted and set according to a target perforation scenario.
3. The monitoring device of claim 1, wherein the photodetector is positioned at a target distance from the first clad optical stripper.
4. A fiber laser for perforation comprising a monitoring device for monitoring the state of perforation of the fiber laser, characterized in that the monitoring device comprises:
a first cladding light stripper for stripping cladding light entering the fiber laser;
the photoelectric monitor is used for monitoring the returned light stripped by the first cladding light stripper and forming a voltage signal output;
the controller is connected with the photoelectric monitor and used for receiving the voltage signal output by the photoelectric monitor and judging whether the voltage signal is smaller than a preset threshold value in real time, and the controller is also used for judging the punching working state according to the voltage signal and the preset threshold value and sending a feedback signal;
the punching working state comprises a surface processing stage, a punching critical point and a punching completion stage, wherein the punching completion stage is performed when the voltage signal is smaller than the preset threshold, the surface processing stage and the punching stage are performed when the voltage signal is larger than the preset threshold, and the punching critical point is performed when the voltage signal is equal to the preset threshold.
5. The fiber laser of claim 4, further comprising a second cladding light stripper connected to the first cladding light stripper for stripping cladding light in the same direction as the laser output direction.
6. The fiber laser of claim 5, wherein the second cladding stripper is disposed at a different location than the first cladding stripper.
7. The fiber laser of claim 6, further comprising a laser module connected to the second cladding stripper for lasing.
8. The fiber laser of claim 7, further comprising an output device coupled to the first cladding stripper, the output device configured to isolate a portion of the returned light.
9. The fiber laser of claim 8, wherein the output device comprises an absorption unit and a reflection unit, the absorption unit and the reflection unit are connected, the absorption unit is used for absorbing the return light, and the reflection unit is used for reflecting the return light.
10. The fiber laser of any of claims 4-9, wherein a base is provided at a bottom end of the photo monitor, the base being used for fixing the photo monitor or adjusting a position of the photo monitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134124.8A CN111082291B (en) | 2019-11-19 | 2019-11-19 | Monitoring device for perforation and fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134124.8A CN111082291B (en) | 2019-11-19 | 2019-11-19 | Monitoring device for perforation and fiber laser |
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| CN111082291A CN111082291A (en) | 2020-04-28 |
| CN111082291B true CN111082291B (en) | 2021-11-09 |
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| CN112162371A (en) * | 2020-09-25 | 2021-01-01 | 武汉锐科光纤激光技术股份有限公司 | Laser energy transmission optical cable |
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| JPH10249566A (en) * | 1997-03-10 | 1998-09-22 | Amada Co Ltd | Laser beam machining method and its device |
| CN105720463A (en) * | 2014-08-01 | 2016-06-29 | 恩耐公司 | Optical fiber, back reflection protection and monitor in laser for optical fiber transmission |
| CN107824989A (en) * | 2017-10-26 | 2018-03-23 | 大族激光科技产业集团股份有限公司 | The detection method and system of a kind of laser beam perforation |
| CN109822228A (en) * | 2019-01-25 | 2019-05-31 | 湖南大科激光有限公司 | A kind of Intelligent optical fiber laser cutting system and its application method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102477C (en) * | 2000-04-21 | 2003-03-05 | 清华大学 | Sound signal sensing method and system for the perforative state of plasma arc welding bath |
| TWI382795B (en) * | 2005-03-04 | 2013-01-11 | Hitachi Via Mechanics Ltd | A method of opening a printed circuit board and an opening device for a printed circuit board |
| CN109993034B (en) * | 2017-12-29 | 2021-06-01 | 大族激光科技产业集团股份有限公司 | Laser perforation detection and judgment method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10249566A (en) * | 1997-03-10 | 1998-09-22 | Amada Co Ltd | Laser beam machining method and its device |
| CN105720463A (en) * | 2014-08-01 | 2016-06-29 | 恩耐公司 | Optical fiber, back reflection protection and monitor in laser for optical fiber transmission |
| CN107824989A (en) * | 2017-10-26 | 2018-03-23 | 大族激光科技产业集团股份有限公司 | The detection method and system of a kind of laser beam perforation |
| CN109822228A (en) * | 2019-01-25 | 2019-05-31 | 湖南大科激光有限公司 | A kind of Intelligent optical fiber laser cutting system and its application method |
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Effective date of registration: 20210415 Address after: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Applicant after: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Applicant after: HAN'S LASER SMART EQUIPMENT GROUP Co.,Ltd. Applicant after: Shenzhen Han's photon laser technology Co.,Ltd. Address before: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Applicant before: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Applicant before: HAN'S LASER SMART EQUIPMENT GROUP Co.,Ltd. |
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