CN219798534U - Laser power monitoring device - Google Patents
Laser power monitoring device Download PDFInfo
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- CN219798534U CN219798534U CN202320198538.2U CN202320198538U CN219798534U CN 219798534 U CN219798534 U CN 219798534U CN 202320198538 U CN202320198538 U CN 202320198538U CN 219798534 U CN219798534 U CN 219798534U
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- laser
- detector
- reflecting mirror
- monitoring device
- laser power
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000010287 polarization Effects 0.000 claims abstract description 20
- 238000002834 transmittance Methods 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a laser power monitoring device, which comprises a first high reflector, a second high reflector, a first reflecting mirror, a second reflecting mirror and a third reflecting mirror, wherein the first high reflector is used for reflecting and transmitting laser incident to the surface of the first high reflector; a second high reflecting mirror for reflecting and transmitting the laser light transmitted through the first high reflecting mirror; and a detector for detecting the laser power transmitted through the second high reflecting mirror. In the technical scheme provided by the utility model, the total transmittance of each polarized component of the laser beam after passing through the first high reflecting mirror and the second high reflecting mirror is the same, and when the polarization state of the laser beam is changed, the power of the laser beam incident to the detector is unchanged, namely false detection is not generated, so that the accuracy of the laser power detection result can be improved.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a laser power monitoring device.
Background
With the gradual maturation of high-power laser technology and the gradual reduction of cost, laser cutting and welding gradually become an important processing means in metal sheet metal processing.
In the case of high requirements for consistency of processing quality, such as welding of new energy batteries, it is necessary to ensure that the laser power incident on the workpiece remains constant, which requires monitoring of the laser power. When the laser power is monitored to exceed the preset power range, an alarm signal is sent out to remind a worker of paying attention, or the laser power is automatically compensated.
Currently, a laser power monitoring device in the industry generally includes a high-reflection mirror, a diaphragm, an attenuation sheet, an optical filter and a detector, and a laser beam is transmitted through the high-reflection mirror, sequentially passes through the diaphragm, the attenuation sheet and the optical filter, and is then received by the detector. However, when the existing laser power monitoring device monitors the power of the laser transmitted by the energy-transmitting optical fiber, the intensity distribution, the divergence angle and the polarization state of the laser can be changed by the change of the coiling radius of the energy-transmitting optical fiber, so that the laser power received by the detector of the laser power monitoring device is changed, thereby causing the laser power monitoring device to generate false detection and reducing the accuracy of the detection result.
Disclosure of Invention
The utility model mainly aims to provide a laser power monitoring device, which aims to solve the technical problem of false detection of the existing laser power monitoring device.
In order to achieve the above object, the present utility model provides a laser power monitoring device, comprising:
the first high reflector is used for reflecting and transmitting the laser incident on the surface of the first high reflector, one part of the laser is used for processing a workpiece after being reflected by the first high reflector, and the other part of the laser is transmitted by the first high reflector;
a second high reflecting mirror for reflecting and transmitting the laser light transmitted through the first high reflecting mirror;
a detector for detecting the laser power transmitted through the second high reflecting mirror;
the first high reflecting mirror, the second high reflecting mirror and the detector are sequentially arranged along the transmission direction of laser, and after the laser is transmitted through the first high reflecting mirror and the second high reflecting mirror, the total transmittance of all polarization components of the laser is the same.
In some embodiments, the laser power monitoring device further comprises a focusing mirror for focusing the laser light transmitted through the second high reflector, the focusing mirror being disposed between the second high reflector and the detector.
In some embodiments, the detector is a photodetector, and the laser beam diameter on the detector is less than the sensing region diameter of the detector.
In some embodiments, the laser power monitoring device further includes an attenuation sheet, where the attenuation sheet is disposed between the focusing mirror and the detector, and is used to attenuate the focused laser power to the power detection range of the detector.
In some embodiments, the laser power monitoring device further comprises a filter disposed between the attenuation sheet and the detector.
In some embodiments, the laser power monitoring device further comprises a housing, wherein the first high reflector, the second high reflector, the detector, the focusing mirror, the attenuation sheet and the optical filter are arranged in the housing;
the surface of the shell is provided with a light inlet and a light outlet, the light inlet is used for enabling laser generated by the laser to enter the shell in an incident mode, and the light outlet is used for enabling the laser reflected by the first high reflector to exit outside the shell.
In some embodiments, the incident light of the first high reflector is at an angle of 45 ° to the first high reflector.
In the technical scheme provided by the utility model, the total transmittance of each polarized component of the laser beam after passing through the first high reflecting mirror and the second high reflecting mirror is the same, and when the polarization state of the laser beam is changed, the power of the laser beam incident to the detector is unchanged, namely false detection is not generated, so that the accuracy of the laser power detection result can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a laser power monitoring device according to an embodiment of the utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Referring to fig. 1, the present utility model provides a laser power monitoring device, which includes:
a first high reflector 10 for reflecting and transmitting the laser light incident on the surface thereof, wherein a part of the laser light is used for processing a workpiece after passing through the first high reflector 10, and the other part of the laser light is transmitted to the back surface thereof through the first high reflector 10;
a second high reflecting mirror 20 for secondarily reflecting and transmitting the laser light transmitted through the first high reflecting mirror 10;
a detector 30 for detecting the laser power transmitted through the second high reflecting mirror 20;
the first high reflecting mirror 10, the second high reflecting mirror 20 and the detector 30 are sequentially arranged along the transmission direction of the laser, and after the laser is transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20, the total transmittance of each polarization component of the laser is the same.
In the present embodiment, the first high reflecting mirror 10 and the second high reflecting mirror 20 are 45 ° high reflecting mirrors, and most of the incident laser light is reflected by the first high reflecting mirror 10 for laser processing on the workpiece, such as laser cutting, laser welding, and the like. The remaining part of the incident laser light is transmitted through the first high reflecting mirror 10, and the transmitted laser light is secondarily reflected and transmitted through the second high reflecting mirror 20. The laser light reflected by the second high reflector 20 is the waste light, and the laser light transmitted by the second high reflector 20 is incident on the surface of the detector 30 for the detector 30 to detect the laser power.
Alternatively, the optical characteristics of the first high reflecting mirror 10 and the second high reflecting mirror 20 are the same, such as transmittance, reflectance, and the like, and the second high reflecting mirror 20 is obtained by rotating the first high reflecting mirror 10 by 90 ° about the Z-axis as the rotation axis. As shown in fig. 1, it is assumed that the laser beam 1 has two polarization components, a first polarization component 11 and a second polarization component 12, respectively, the first polarization component 11 being vertically polarized with respect to the first high mirror 10 and being horizontally polarized with respect to the second high mirror 20. The second polarization component 12 is horizontally polarized with respect to the first high mirror 10 and vertically polarized with respect to the second high mirror 20.
Since the first high reflecting mirror 10 and the second high reflecting mirror 20 have the same optical characteristics, the transmittance of the first high reflecting mirror 10 and the second high reflecting mirror 20 for light polarized vertically and the transmittance for light polarized horizontally are assumed to be 0.2% and 0.6%, respectively. Thus, the total transmittance of the first polarization component 11 transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20 is 0.2% by 0.6%, and the total transmittance of the second polarization component 12 transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20 is 0.6% by 0.2%. That is, the total transmittance of the first and second polarization components 11 and 12 of the laser beam 1 after passing through the first and second high reflecting mirrors 10 and 20 is the same, and therefore, even if the polarization state of the laser beam 1 is changed (the power ratio of the first and second polarization components 11 and 12), the power of the laser beam incident on the surface of the detector 30 is not changed, thereby ensuring the accuracy of laser power detection.
In some embodiments, referring to fig. 1, the laser power monitoring device according to the present utility model further includes a focusing mirror 40 for focusing the laser light transmitted through the second high reflector 20, where the focusing mirror 40 is disposed between the second high reflector 20 and the detector 30.
In this embodiment, the focusing mirror 40 focuses the laser light transmitted through the second high reflecting mirror 20, so that the detector 30 can collect the whole of the laser beam 1. Thus, when the intensity distribution and divergence angle of the laser beam 1 are changed, the beam diameter of the laser beam incident on the surface of the detector 30 is changed, but the laser power received by the detector 30 is not changed, so that the accuracy of the detection result can be ensured.
In some embodiments, the detector 30 according to the present utility model is a photodetector 30, and the diameter of the laser beam on the detector 30 is smaller than the diameter of the sensing area of the detector 30.
In this embodiment, since the diameter of the laser beam on the detector 30 is smaller than the diameter of the sensing area of the detector 30, when the intensity distribution and the divergence angle of the laser beam 1 are changed, the laser power received by the detector 30 is unchanged although the beam diameter of the laser beam incident on the surface of the detector 30 is changed, so that the accuracy of the detection result can be ensured. For example, the laser beam diameter on the detector 30 is 5mm and the sensing area of the detector 30 is 10mm.
In some embodiments, the focal length of the focusing lens 40 is 19-21mm, the distance between the detector 30 and the focusing lens 40 is 14-16mm, the diameter of the sensing area of the detector 30 is 9-11mm, and the diameter of the laser beam on the detector 30 is 4-6mm.
In some embodiments, referring to fig. 1, the laser power monitoring device according to the present utility model further includes an attenuation sheet 50, where the attenuation sheet 50 is disposed between the focusing mirror 40 and the detector 30, and is used for attenuating the focused laser power to the power detection range of the detector 30.
In this embodiment, the attenuation sheet 50 attenuates the power of the laser beam so that the power of the laser beam is within the power detection range of the detector 30. For example, the power of the laser beam 1 generated by the laser is 6000W, the total transmittance of the first high reflecting mirror 10 and the second high reflecting mirror 20 to the laser beam 1 is 0.2% ×0.6%, and the total power of the laser beam 1 after being transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20 is 6000×0.2% ×0.6% =72 mW. The power detection range of the detector 30 is 1-10mW, the transmittance of the attenuation sheet 50 is 10%, and the power of the transmitted laser beam attenuated by the attenuation sheet 50 is 7.2mV, which is within the power detection range of the detector 30, so that the transmitted laser beam can be detected by the detector 30.
In some embodiments, referring to fig. 1, the laser power monitoring device according to the present utility model further includes a filter 60, where the filter 60 is disposed between the attenuation sheet 50 and the detector 30, and is used for filtering light outside the incident laser band.
In this embodiment, the filter 60 is used to filter light outside the incident laser band, such as illumination light, so as to avoid the light from striking the surface of the detector 30 and affecting the detection result of the detector 30.
In some embodiments, the transmittance of the attenuation sheet 50 is 9% -11%, and the power detection range of the detector 30 is 1-10mW.
In some embodiments, the laser power monitoring device provided by the present utility model further includes a housing, where the first high reflector 10, the second high reflector 20, the detector 30, the focusing mirror 40, the attenuation sheet 50, and the optical filter 60 are disposed in the housing; the surface of the shell is provided with a light inlet and a light outlet, the light inlet is used for enabling laser generated by the laser to enter the shell in an incident mode, and the light outlet is used for enabling the laser reflected by the first high reflector 10 to be emitted out of the shell.
In this embodiment, the housing is a metal enclosed housing, in which a receiving cavity is formed, and the first high reflecting mirror 10, the second high reflecting mirror 20, the detector 30, the focusing mirror 40, the attenuation sheet 50 and the optical filter 60 are all disposed in the receiving cavity. The surface of casing is provided with light inlet and light outlet, and wherein, light inlet is used for supplying the laser incident that the laser produced to get into in the casing, and light outlet is used for supplying the laser outgoing to the casing outside after the reflection of first high reflector 10. That is, the laser beam generated by the laser is incident to the surface of the first high reflector 10 through the light inlet on the housing, and then is reflected to the surface of the workpiece through the light outlet on the housing.
In some embodiments, the incident light of the first high reflector is at an angle of 45 ° to the first high reflector.
In some embodiments, the reflectivity of both the first and second high reflectors 10 and 20 is greater than 99%.
The principle of the laser power monitoring device is described in the following specific embodiment:
the laser beam 1 generated by the laser has a power of 6000W, a first polarization component 11 of 3000W, a second polarization component 12 of 3000W, and the first and second highly reflective mirrors 10 and 20 each have a transmittance of 0.2% for vertically polarized light and a transmittance of 0.6% for horizontally polarized light. Thus, the power of the first polarization component 11 and the second polarization component 12 of the laser beam 1 transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20 is 3000×0.2% ×0.6%, and the total power of the laser beam 1 transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20 is 6000×0.2% ×0.6% =72 mW.
The power detection range of the detector 30 is 1-10mW, the transmissivity of the attenuation sheet 50 is 10%, the laser beam 1 is focused through the focusing mirror 40 after being transmitted through the first high reflecting mirror 10 and the second high reflecting mirror 20, the focused laser beam attenuates the power of the laser beam through the attenuation sheet 50, the power of the attenuated laser beam is 7.2mW, the power of the attenuated laser beam is in the power detection range of the detector 30, and the attenuated laser beam is incident on the surface of the detector 30 and received by the surface after being filtered through the optical filter 60, so that the power of the laser beam is detected.
Those skilled in the art may combine and combine the features of the different embodiments or examples described in this specification and of the different embodiments or examples without contradiction.
The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.
Claims (7)
1. A laser power monitoring device, comprising:
the first high reflector is used for reflecting and transmitting the laser incident on the surface of the first high reflector, one part of the laser is used for processing a workpiece after being reflected by the first high reflector, and the other part of the laser is transmitted by the first high reflector;
a second high reflecting mirror for secondarily reflecting and transmitting the laser light transmitted through the first high reflecting mirror;
a detector for detecting the laser power transmitted through the second high reflecting mirror;
the first high reflecting mirror, the second high reflecting mirror and the detector are sequentially arranged along the transmission direction of laser, and after the laser is transmitted through the first high reflecting mirror and the second high reflecting mirror, the total transmittance of all polarization components of the laser is the same.
2. The laser power monitoring device according to claim 1, further comprising a focusing mirror for focusing the laser light transmitted through the second high reflecting mirror, the focusing mirror being provided between the second high reflecting mirror and the detector.
3. The laser power monitoring device of claim 2, wherein the detector is a photodetector, and the laser beam diameter on the detector is smaller than the sensing area diameter of the detector.
4. The laser power monitoring device of claim 2, further comprising an attenuation sheet disposed between the focusing mirror and the detector for attenuating the focused laser power to a power detection range of the detector.
5. The laser power monitoring device of claim 4, further comprising a filter disposed between the attenuator and the detector.
6. The laser power monitoring device of claim 5, further comprising a housing, the first high reflector, the second high reflector, the detector, the focusing mirror, the attenuation sheet, and the optical filter being disposed within the housing;
the surface of the shell is provided with a light inlet and a light outlet, the light inlet is used for enabling laser generated by the laser to enter the shell in an incident mode, and the light outlet is used for enabling the laser reflected by the first high reflector to exit outside the shell.
7. The laser power monitoring device of claim 1, wherein the incident light of the first high reflector is at an angle of 45 ° to the first high reflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320198538.2U CN219798534U (en) | 2023-02-13 | 2023-02-13 | Laser power monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320198538.2U CN219798534U (en) | 2023-02-13 | 2023-02-13 | Laser power monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219798534U true CN219798534U (en) | 2023-10-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320198538.2U Active CN219798534U (en) | 2023-02-13 | 2023-02-13 | Laser power monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219798534U (en) |
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2023
- 2023-02-13 CN CN202320198538.2U patent/CN219798534U/en active Active
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