Optical path monitoring and protecting device

Abstract

The invention discloses a light path monitoring protection device, and relates to the technical field of laser, the light path monitoring protection device comprises a substrate, a cover plate and a detection assembly, and the substrate extends along a first direction. According to the technical scheme provided by the invention, the movable photoelectric detector is adopted, so that the position of the photoelectric detector can be flexibly adjusted to adapt to the requirements of different laser devices and light path layouts, and when the laser devices leak light in the working process, because the light intensity of the leaked light is related to the relative position of a light leakage point, the light leakage point can be accurately detected. The farther the distance from the light leakage point is, the weaker the light intensity is; the closer to the light leakage point, the stronger the light intensity. Therefore, through the movable photoelectric detector, the relative position between the photoelectric detector and the light leakage point is changed, the light leakage power on the target surface of the photoelectric detector is adjusted, the photoelectric detector converts a received light signal into an electric signal, the electric signal is amplified, processed and judged through a circuit, and finally the monitoring function is achieved.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and particularly relates to an optical path monitoring and protection device. Background Art

[0002] With the rapid development of the laser industry, the output power of fiber lasers has been continuously increasing. In the optical path of a laser, a photodiode is used to monitor the fusion points, key devices, and light leakage positions in the optical path. However, it has become increasingly difficult to ensure timely power-off protection for the optical path after damage. If the light leakage at the position where the photodiode is placed is too weak, the diode cannot respond, resulting in non-protection or false protection of the optical monitoring. If the scattered light at the position where the photodiode is placed is too strong, the signal intensity of the photodiode is easily saturated, and the signal intensity cannot change with the increase in the light leakage intensity.

[0003] Generally, the measure that can be taken is to add or subtract a ceramic sheet in front of the photodiode to change the light intensity received on the target surface of the diode. However, this measure has drawbacks: firstly, in the position where the light leakage is strong, the ceramic sheet may be burned out by the light leakage; secondly, the aging of the ceramic sheet under long-term laser irradiation will cause changes in the light signal intensity on the target surface of the photodiode, affecting the long-term working stability of the laser and possibly causing false protection of the optical monitoring. Summary of the Invention

[0004] The main object of the present invention is to propose an optical path monitoring and protection device, aiming to improve the protection of the optical path in a timely manner.

[0005] To achieve the above object, the optical path monitoring and protection device proposed by the present invention includes:

[0006] A substrate, extending along a first direction and having an installation surface;

[0007] A cover plate, covering the installation surface of the substrate. An installation cavity is defined between the cover plate and the installation surface of the substrate. The installation cavity extends along the first direction for installing a laser device, and the cover plate is provided with a light-transmitting portion corresponding to the installation cavity; and,

[0008] A detection component, including a photodetector. The photodetector is movably arranged on the cover plate along the first direction, and the photodetector can detect the optical signal of the laser device located in the installation cavity through the light-transmitting portion.

[0009] In an embodiment, the cover plate is detachably connected to the substrate.

[0010] In an embodiment, the detection component further includes a movable seat. The movable seat is movably arranged on the cover plate along the first direction. An installation hole communicating with the light-transmitting portion is formed on the movable seat, and the photodetector is installed in the installation hole.

[0011] In one embodiment, the substrate is provided with a sliding groove extending in a first direction, and a sliding block is provided at a position corresponding to the sliding groove on the movable seat, and the sliding block is slidably disposed in the sliding groove.

[0012] In one embodiment, the sliding grooves are formed on both sides of the substrate along a second direction, the sliding blocks are disposed on one side of the movable seat along a third direction, and the sliding blocks are slidably connected to the sliding grooves.

[0013] In one embodiment, the detection assembly further includes a fixing portion, the fixing portion includes a bolt, the bolt is disposed on one side of the movable seat along the second direction, and passes through the sliding block and abuts against the sliding groove.

[0014] In one embodiment, a first limiting groove is recessed in the mounting surface of the substrate in a direction away from the substrate, and a second limiting groove is recessed in a surface of the cover plate close to the substrate in a direction away from the substrate, and the first limiting groove and the second limiting groove communicate with each other to form the mounting cavity.

[0015] In one embodiment, the light-transmitting portion includes a light-transmitting groove, and the light-transmitting groove communicates with the mounting cavity.

[0016] In one embodiment, a dust-proof sheet is covered above the light-transmitting groove.

[0017] In one embodiment, the inner wall of the mounting cavity is coated with thermal conductive silicone grease.

[0018] Through the adoption of the movable photodetector provided by the technical solution of the present invention, the photodetector can flexibly adjust its position to meet the requirements of different laser devices and optical path layouts. When light leakage occurs during the operation of the laser device, since the light intensity of the light leakage is related to the relative position of the light leakage point, the farther away from the light leakage point, the weaker the light intensity; the closer to the light leakage point, the stronger the light intensity. Therefore, by means of the movable photodetector, the relative position between the photodetector and the light leakage point is changed, the light leakage power on the target surface of the photodetector is adjusted, the photodetector converts the received optical signal into an electrical signal, and the electrical signal is amplified, processed and judged through a circuit, and finally the monitoring function is realized. Furthermore, the problems of false protection or non-protection that may occur in the optical monitoring process of traditional fixed-position photodiodes are reduced. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the optical path monitoring and protection device provided by the present invention;

[0021] Figure 2 For Figure 1 the split structure diagram;

[0022] Figure 3 Schematic diagram of the three-dimensional structure of another embodiment of the optical path monitoring and protection device provided by the present invention;

[0023] Figure 4 Schematic diagram of the three-dimensional bottom view of the connection between the dust-proof sheet and the movable seat in the optical path monitoring and protection device provided by the present invention.

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, optical path monitoring and protection device; 1, substrate; 11, mounting surface; 12, light-transmitting part; 121, light-transmitting groove; 122, dust-proof sheet; 13, sliding groove; 14, first limiting groove; 15, connection groove; 2, cover plate; 21, mounting cavity; 22, second limiting groove; 3, detection component; 31, photodetector; 32, movable seat; 321, sliding block; 33, mounting hole; 34, fixing part; 341, bolt.

[0026] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. 34

[0030] With the rapid development of the laser industry, the output power of fiber lasers has been continuously increasing. When using a photodiode to monitor the fusion points, key devices, and light leakage positions in the laser beam path to ensure timely power-off protection of the beam path after the beam path is damaged, the difficulty is also increasing. If the light leakage at the position where the photodiode is placed is too weak, the diode cannot respond, which may lead to the situation of non-protection or false protection of the light monitoring; if the scattered light at the position where the photodiode is placed is too strong, the signal intensity of the photodiode is easily saturated, and the signal intensity cannot change with the increase of the light leakage intensity.

[0031] Generally, the measure that can be taken is to add or subtract a ceramic sheet in front of the photodiode to change the light intensity received on the target surface of the diode. However, this measure has drawbacks: First, in the position where the light leakage is strong, the ceramic sheet may be burned by the light leakage; Second, the aging of the ceramic sheet under long-term laser irradiation will cause the change of the light signal intensity on the target surface of the photodiode, affecting the long-term working stability of the laser and possibly triggering false protection of the light monitoring.

[0032] The present invention proposes an optical path monitoring and protection device aimed at timely improving the protection of the optical path.

[0033] Please refer to Figure 1 and Figure 2, in an embodiment of the present invention, the optical path monitoring and protection device 100 includes a substrate 1, a cover plate 2, and a detection component 3. The substrate 1 extends along a first direction and has an installation surface 11. The cover plate 2 covers the installation surface 11 of the substrate 1. An installation cavity 21 is defined between the cover plate 2 and the installation surface 11 of the substrate 1. The installation cavity 21 extends along the first direction for installing a laser device, and the cover plate 2 is provided with a light-transmitting portion 12 corresponding to the installation cavity 21. The detection component 3 includes a photodetector 31. The photodetector 31 is movably arranged on the cover plate 2 along the first direction, and the photodetector 31 can detect the optical signal of the laser device located in the installation cavity 21 through the light-transmitting portion 12.

[0034] The technical solution of the present invention adopts the movable photodetector 31, so that the photodetector 31 can flexibly adjust its position to meet the requirements of different laser devices and optical path layouts. When light leakage occurs during the operation of the laser device, since the light intensity of the light leakage is related to the relative position of the light leakage point, the farther away from the light leakage point, the weaker the light intensity; the closer to the light leakage point, the stronger the light intensity. Therefore, through the movable photodetector 31, the relative position between the photodetector 31 and the light leakage point is changed, and the light leakage power on the target surface of the photodetector 31 is adjusted. The photodetector 31 converts the received optical signal into an electrical signal, which is amplified, processed, and judged through a circuit, and finally the monitoring function is realized. Furthermore, it reduces the problems of false protection or non-protection that may occur in the traditional fixed-position photodiode during optical monitoring.

[0035] It can be understood that the setting method of the light-transmitting portion 12 can be to open a hole or a slot, that is, a hole or a slot is opened on the cover plate 2; the light-transmitting portion 12 can also be set as a transparent cover plate 2 to receive the light leakage.

[0036] Specifically, please refer to Figure 4 , in an embodiment, the light-transmitting portion 12 includes a light-transmitting slot 121, and the light-transmitting slot 121 communicates with the installation cavity 21. With such a setting, the light can pass through smoothly through the light-transmitting slot 121, improving the detection efficiency.

[0037] It should be explained that the installation method of the photodetector 31 is fixed installation. For example, epoxy resin AB glue is used, which has high bonding strength, high hardness, high chemical resistance, and anti-yellowing effect, and can be fixed in the movable seat 32 and connected to the control circuit to be used as the adjustable monitoring and protection of the laser. Of course, other mechanical structure fastening methods, such as a clamping structure, can also be used for fixing.

[0038] In order to facilitate the installation of the laser device, in one embodiment, the cover plate 2 is detachably connected to the substrate 1. In this way, it is convenient for the user to easily separate the cover plate 2 from the substrate 1 when needed, thus facilitating operations such as the installation, maintenance, or replacement of the laser device. And through this detachable connection method, not only is the flexibility of the laser device installation improved, but it can also ensure that when the laser device is not in use, the cover plate 2 can be safely fixed on the substrate 1, protecting the laser device from the influence of the external environment, and at the same time facilitating the overall transportation and storage of the device.

[0039] It can be understood that there are various detachable methods between the cover plate 2 and the substrate 1. For example, the two are tightly connected by screws; or a snap component is used to connect the two.

[0040] In one embodiment, the detection component 3 further includes a movable seat 32. The movable seat 32 is movably arranged on the cover plate 2 along a first direction. An installation hole 33 leading to the light-transmitting part 12 is formed on the movable seat 32, and the photodetector 31 is installed in the installation hole 33. In this way, the installation of the photodetector 31 is facilitated through the installation hole 33, so that the photodetector 31 can be accurately positioned, and can effectively receive the light passing through the light-transmitting part 12, improving the accuracy of detection, and at the same time improving the stability and reliability of the entire detection component 3.

[0041] It can be understood that in this embodiment, the movable setting method of the movable seat 32 is not specifically limited, such as a sliding connection.

[0042] Specifically, in one embodiment, the substrate 1 is provided with a sliding groove 13 extending along the first direction. A sliding block 321 is arranged on the movable seat 32 corresponding to the position of the sliding groove 13, and the sliding block 321 is slidably arranged in the sliding groove 13. With such a setting, the sliding block 321 and the sliding groove 13 cooperate with each other, improving the smoothness of the movement of the movable seat 32, so that the movable seat 32 can move smoothly on the substrate 1.

[0043] In order to improve the use effect of the detection component 3 and reduce the light leakage when the movable seat 32 moves, in one embodiment, the sliding groove 13 is opened on both sides of the substrate 1 along a second direction, the sliding blocks 321 are arranged on both sides of the movable seat 32 along a third direction, and the sliding blocks 321 are slidably connected to the sliding groove 13. With such a setting, the stability and sealing performance of the movable seat 32 during movement can be effectively improved, so as to achieve the purpose of reducing light leakage. In addition, the smoothness of the movement of the movable seat 32 can also be improved.

[0044] Considering the situation that the movable seat 32 needs to be fixed after sliding, in one embodiment, the detection component 3 further includes a fixing portion 34. The fixing portion 34 includes a bolt 341. The bolt 341 is disposed on one side of the movable seat 32 along the second direction and passes through and abuts against the sliding groove 13 within the sliding block 321. In this way, after the movable seat 32 completes sliding, the bolt 341 can effectively fix the movable seat 32 stably at the desired position through its fixing effect, which helps to improve the stability and reliability of the entire device and also simplifies subsequent maintenance and adjustment work.

[0045] In some embodiments, the installation cavity 21 can be arranged by grooving on the installation surface 11; it can also be arranged by grooving on both the installation surface 11 and the side of the cover plate 2 opposite to the installation surface 11.

[0046] Specifically, in one embodiment, the installation surface 11 of the substrate 1 is recessed with a first limiting groove 14 in a direction away from the substrate 1, and one side of the cover plate 2 close to the substrate 1 is recessed with a second limiting groove 22 in a direction away from the substrate 1. The first limiting groove 14 communicates with the second limiting groove 22 to form the installation cavity 21. With this setting, through the mutual cooperation of these two limiting grooves, the installation cavity 21 is formed, and the laser device can be placed. While reducing the volume of the overall device, the laser device can also be stably placed, improving the stability of the test.

[0047] It is worth mentioning that in order to adapt to a laser device, such as a cladding light stripper encapsulated in a glass tube, both the first limiting groove 14 and the second limiting groove 22 are set to be semicircular, and the first limiting groove 14 and the second limiting groove 22 are butt - jointed and combined into a circle.

[0048] Please refer to Figure 3 , it is worth mentioning that in order to adapt to a laser device with light leakage points, a quartz optical fiber with light leakage points, the first limiting groove 14 is set to be square, and connection grooves 15 communicating therewith are arranged at both ends of the first limiting groove 14 along the first direction.

[0049] In addition, in one embodiment, a dust - proof sheet 122 is covered above the light - transmitting groove 121. With this setting, it can reduce the entry of dust and other tiny particles into the interior of the light - transmitting groove 121, thereby maintaining the cleanliness and light - transmitting performance of the light - transmitting groove 121 and improving the monitoring sensitivity.

[0050] It should be explained that the material selection and structural design of the dust - proof sheet 122 need to consider light transmittance, durability, and compatibility with the light - transmitting groove 121 to ensure that it can effectively perform its function without causing any negative impact on the normal operation of the light - transmitting groove 121. For example, it can be a transparent plate.

[0051] In one embodiment, the inner wall of the installation cavity 21 is coated with thermal grease. With this arrangement, the heat conduction efficiency can be effectively improved, overheating problems caused by heat accumulation can be reduced, and the operating stability can be enhanced. In addition, the use of thermal grease can also reduce the thermal resistance, making the heat transfer smoother and further improving the heat dissipation performance of the device.

[0052] It should be added that the materials of the substrate 1, the cover plate 2, and the movable seat 32 are set as metals to facilitate heat conduction.

[0053] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An optical path monitoring and protection device, characterized in that, Comprising: A substrate, extending along a first direction and having a mounting surface; A cover plate, covering the mounting surface of the substrate, defining a mounting cavity between the cover plate and the mounting surface of the substrate, the mounting cavity extending along the first direction for mounting a laser device, and the cover plate being provided with a light-transmitting portion corresponding to the mounting cavity; And, A detection component, including a photodetector, the photodetector being movably arranged on the cover plate along the first direction, and the photodetector being able to detect the optical signal of the laser device located in the mounting cavity through the light-transmitting portion.

2. The optical path monitoring and protection device as described in claim 1, characterized in that, The cover plate is detachably connected to the substrate.

3. The optical path monitoring and protection device according to claim 1, characterized in that, The detection component further includes a movable seat, the movable seat being movably arranged on the cover plate along the first direction, an installation hole leading to the light-transmitting portion being formed in the movable seat, and the photodetector being installed in the installation hole.

4. The optical path monitoring and protection device according to claim 3, characterized in that The substrate is provided with a sliding groove extending along the first direction, and the movable seat is provided with a sliding block corresponding to the position of the sliding groove, the sliding block being slidably arranged in the sliding groove.

5. The optical path monitoring and protection device according to claim 4, characterized in that, The sliding groove is formed on both sides of the substrate along a second direction, the sliding block is arranged on one side of the movable seat along a third direction, and the sliding block is slidably connected to the sliding groove.

6. The optical path monitoring and protection device according to claim 5, characterized in that, The detection component further includes a fixing portion, the fixing portion including a bolt, the bolt being arranged on one side of the movable seat along the second direction and passing through the sliding block to abut against the sliding groove.

7. The optical path monitoring and protection device according to claim 1, characterized in that The mounting surface of the substrate is recessed with a first limiting groove in a direction away from the substrate, and one side of the cover plate close to the substrate is recessed with a second limiting groove in a direction away from the substrate, and the first limiting groove and the second limiting groove communicate with each other to form the mounting cavity.

8. The optical path monitoring and protection device according to claim 1, characterized in that, The light-transmitting portion includes a light-transmitting groove, and the light-transmitting groove communicates with the mounting cavity.

9. The optical path monitoring and protection device according to claim 8, wherein, A dust-proof sheet is covered above the light-transmitting groove.

10. The optical path monitoring and protection device according to claim 1, characterized in that, The inner wall of the mounting cavity is coated with thermal conductive silicone grease.

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