CN113588136B - Laser power meter - Google Patents
Laser power meter Download PDFInfo
- Publication number
- CN113588136B CN113588136B CN202110958575.4A CN202110958575A CN113588136B CN 113588136 B CN113588136 B CN 113588136B CN 202110958575 A CN202110958575 A CN 202110958575A CN 113588136 B CN113588136 B CN 113588136B
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- China
- Prior art keywords
- laser
- laser power
- absorber
- power meter
- heat dissipation
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- 239000006096 absorbing agent Substances 0.000 claims abstract description 34
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- 230000017525 heat dissipation Effects 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000003491 array Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 239000000306 component Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/003—Measuring quantity of heat for measuring the power of light beams, e.g. laser beams
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a laser power meter which mainly comprises an absorber and a shell. The core part is an absorber and is formed by processing a whole piece of high-heat-conductivity material, and comprises an absorption target surface, a flow guide component, a heat dissipation component and the like. The absorption target surface is opposite to the laser entrance of the shell and comprises a series of concentric V-shaped circular grooves for improving the absorptivity of the incident laser. The flow guide assembly comprises a group of flow guide column arrays, and temperature sensors are respectively arranged at two ends of a hole between the flow guide columns and can measure the temperature of the hot end and the cold end in the absorber body. And calculating the laser power to be measured according to the measured temperature difference. The heat dissipation assembly is arranged in a running water environment so as to improve heat dissipation efficiency. The shell is provided with a water inlet and a water outlet, and is connected with external cooling water to realize water cooling heat dissipation. The laser power meter adopts an integrated absorber design, so that the heat balance time can be shortened, and the response speed can be improved. Meanwhile, the laser absorption rate of the absorption target surface is high, and the measurement result is more accurate and stable.
Description
Technical Field
The invention belongs to the technical field of laser radiation parameter measurement, relates to a laser power measurement device, and in particular relates to a high-power laser power meter.
Background
In recent years, high-power laser technology is becoming mature and widely used in various fields. In the process, the output power of the laser is continuously improved, for example, the optical fiber laser which is the fastest in recent years, the output power of a single module is over ten thousand watts, and the output power of multimode laser breaks through 100kW. As laser power levels increase, corresponding laser power measurement devices are required to monitor and evaluate performance. The current high-power laser power meter commonly adopts a thermal method to measure the laser power, but the measurement accuracy, response speed and laser damage resistance cannot meet the measurement requirements of the current high-power laser. This is because, on the one hand, most of the existing laser power meters measure the surface temperature of the absorber, not the internal temperature, and therefore, the temperature measurement error is large and the temperature drift easily occurs. In addition, the existing laser power meter has larger thermal resistance in the heat conduction process, long heat balance time and slower response of the power meter. In addition, the existing laser power meter has lower beam expansion of incident laser, uneven laser power density distribution on an absorption surface, poor laser damage resistance and high probability of being damaged by the laser in the measuring process.
Therefore, it is very necessary to develop a novel laser power meter, which improves the measurement accuracy and response speed, and also improves the laser damage resistance of the laser power meter so as to better meet the measurement requirements of the current high-power laser.
Disclosure of Invention
The invention aims to solve the technical problems that: the novel laser power meter is high in measurement accuracy, stable in performance, high in response speed and high in laser damage threshold.
The technical scheme of the invention is as follows:
a laser power meter mainly comprises an absorber and a shell. The absorber is formed by processing a whole piece of high-heat-conductivity material and comprises an absorption target surface, a flow guide component, a heat dissipation component and the like, and can realize the functions of light absorption, photo-thermal conversion, heat energy conduction, measurement, cooling and the like.
The absorption target surface is opposite to the laser entrance of the shell and comprises a series of concentric V-shaped annular grooves, so that the absorption area of incident laser can be increased, the laser power density can be reduced, and the laser damage resistance can be improved. The absorption target surface can also improve the absorptivity of laser through a surface treatment process, so that the measurement accuracy is improved.
The purpose of the flow guide assembly is to measure the temperature inside the absorber. The flow guide assembly comprises a group of flow guide column arrays, and temperature sensors are respectively arranged at two ends of a hole between the flow guide columns and used for measuring the temperature of the hot end and the cold end in the absorber body. According to the temperature difference between the hot end and the cold end, the power value of the laser to be measured can be obtained through further calculation and analysis.
The heat dissipation assembly is arranged in a running water environment and is used for improving the heat dissipation efficiency of the absorber. The running water environment is an environment which is communicated with external cooling water and can continuously circulate.
The absorption target surface, the flow guide component and the heat dissipation component are sequentially arranged along the transmission direction of the laser to be measured and integrated, and are formed by processing a whole piece of high-heat-conductivity material. Commonly employed materials include, but are not limited to, pure copper, oxygen free copper, pure aluminum, aluminum alloys, and the like.
The housing may include a front housing and a rear housing. The front shell comprises a laser entrance port and an electric connection port. The rear shell comprises a water inlet and a water outlet and is respectively communicated with external cooling water.
The laser power meter is connected with an external control and display instrument through a cable or connected with a computer to realize measurement and analysis of laser power.
And a sealing rubber ring is arranged at the joint of the rear shell and the absorber and used for sealing and waterproofing.
Compared with the prior art, the invention has the advantages that:
1. The laser power meter is specially provided with the flow guide component, so that the measurement of the internal temperature of the absorber can be realized, and compared with a conventional method for measuring the surface temperature, the laser power meter is higher in measurement accuracy and better in stability.
2. The absorber of the laser power meter is processed by adopting a whole piece of high-heat-conductivity material and comprises key functional modules such as an absorption target surface, a flow guide component, a heat dissipation component and the like, so that the problem of increased heat resistance caused by assembly thermal contact of the conventional laser power meter is fundamentally avoided, and the response speed of the laser power meter is obviously improved.
3. Compared with the traditional plane structure, the laser absorption device has the advantages that on one hand, the laser power density can be greatly reduced, the laser damage threshold is improved, on the other hand, the absorption rate of the target surface is improved, and the measurement error is reduced.
Drawings
FIG. 1 is a diagram of the external configuration of a laser power meter according to an embodiment of the present invention;
FIG. 2 is an internal block diagram of a laser power meter according to an embodiment of the present invention;
FIG. 3 is a diagram of the front end of an absorber of a laser power meter according to an embodiment of the present invention;
fig. 4 is a view showing a rear end structure of an absorber of a laser power meter according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail with reference to embodiments in the accompanying drawings.
Referring to fig. 1 to 4, a laser power meter of the present embodiment mainly includes an absorber 1 and a case 2. The absorber 1 is placed inside the housing 2, and the absorber and the housing are fixed together by screws.
The absorber 1 is a core component of the laser power meter, is manufactured by processing a whole piece of pure copper, and comprises key functional modules such as an absorption target surface 101, a flow guiding component 102, a heat radiating component 103 and the like.
The absorber 1 has an absorption target surface 101 at the front end thereof for absorbing energy of incident laser light and converting the energy into heat energy. In order to improve the absorptivity of the incident laser, the absorbing target surface 101 is processed into a V-shaped circular groove structure with a sharp bottom, and a surface treatment process is adopted on the absorbing target surface 101 to improve the absorptivity of the absorbing target surface 101 to the laser.
The absorbent body 1 further comprises a baffle assembly 102. The flow guiding component 102 is a flow guiding column array formed by a series of flow guiding columns with the same size and arranged at equal intervals, and a series of holes are arranged between adjacent flow guiding columns. One end of the flow guide column, which is close to the target surface, is a hot end, and one end of the flow guide column, which is close to the heat dissipation assembly, is a cold end. The temperature sensors are respectively arranged at the hot end and the cold end of the hole between the adjacent guide posts, so that the temperature of the hot end and the cold end in the absorber in the heat conduction process can be measured, the temperature difference can be obtained by calculation, and the power of the incident laser can be calculated.
The rear end of the absorber 1 is a heat dissipation component 103. The heat dissipation component 103 is a heat dissipation fin structure, that is, is formed by a series of heat dissipation fins with equal thickness which are arranged at equal intervals. The heat dissipation component 103 is placed in a circulating water environment to realize heat dissipation, so that the temperature of the absorber 1 is ensured not to exceed the allowable highest temperature, and the safety and normal function of equipment are ensured.
The middle protruding part of the absorber 1 is a mounting flange for being mounted and fixed with the shell. The mounting flange comprises a sealing groove 5 for mounting a sealing rubber ring, and cooling water is sealed in a closed space around the heat dissipation assembly, so that water is prevented from leaking. A series of mounting holes are formed in the periphery of the mounting flange and used for fixing the mounting flange and the shell through screws.
The housing 2 includes a front housing 201 and a rear housing 202. The front housing 201 has a hole in the middle of its front end as the laser entrance port 3 for measurement. The laser entrance port 3 is disposed concentrically with the absorption target surface 101 of the absorber 1. The side of the front housing 201 also includes an opening for passing through an electrical cable connected to the temperature sensor and connected to an external meter. The rear end of the rear housing 202 is provided with a water inlet 4 and a water outlet 3 respectively for connecting an external water inlet pipe and an external water outlet pipe.
The housing 2 further comprises a fixing assembly 6 for mounting and fixing the laser power meter via a corresponding support assembly.
The working process of the laser power meter is as follows:
The laser to be measured is irradiated to the laser entrance 3 of the laser power meter, the laser is absorbed by the absorption target surface 101 of the absorber 1, converted into heat, and conducted from the front end to the rear end along the absorber 1, and when the heat flow passes through the flow guiding component 102, the temperature change of the flow guiding column, namely the temperature change of the absorber due to the absorption of the laser energy, is caused. The temperature signal is collected by a plurality of temperature sensors distributed at the hot end and the cold end and is transmitted to an instrument or a computer system connected with the temperature sensors and responsible for control and display, and the laser power value to be measured is obtained through further data analysis and processing. In the working process of the laser power meter, external cooling water cools and dissipates heat of the absorber 1 through the water inlet 4 and the water outlet 3.
The above examples are merely illustrative of embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Various modifications and improvements of the technical solution of the present invention, which do not depart from the design concept of the invention, should be made by those skilled in the art, the scope of the present invention is defined by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference numerals in the claims shall not be regarded as limiting the claims concerned.
Claims (4)
1. A laser power meter, comprising an absorber and a housing; the absorber is arranged in the shell and is processed by adopting a whole piece of high-heat-conductivity material and comprises an absorption target surface, a flow guide component and a heat dissipation component; the absorption target surface, the flow guide component and the heat dissipation component are sequentially arranged along the transmission direction of the laser to be detected and are of an integrated structure; the absorption target surface is opposite to the laser entrance of the shell and comprises a series of concentric V-shaped circular grooves; the air guide assembly comprises a group of air guide column arrays formed by the same air guide columns which are arranged at equal intervals, a series of holes are formed between the adjacent air guide columns, one end, close to the target surface, of each air guide column is a hot end, one end, close to the heat dissipation assembly, of each air guide column is a cold end, and a plurality of temperature sensors are respectively arranged at the hot ends and the cold ends of the holes between the adjacent air guide columns and used for measuring the temperature of the hot ends and the cold ends inside the absorber body; the rear end of the absorber is provided with a heat radiating component, and the heat radiating component is formed by a series of heat radiating fins with equal thickness which are arranged at equal intervals; the heat dissipation assembly is placed in a flowing water environment, wherein the flowing water environment is communicated with external cooling water and can continuously and circularly flow.
2. The laser power meter of claim 1, wherein the housing comprises a front housing and a rear housing, the front housing comprising a laser entrance and an electrical connection, the rear housing comprising a water inlet and a water outlet and being in communication with external cooling water, respectively.
3. A laser power meter according to claim 1, wherein the laser power meter is connected to an external control and display instrument or to a computer by means of a cable, for performing a measurement analysis of the laser power.
4. A laser power meter as claimed in claim 2, wherein a sealing rubber ring is provided at the junction of the rear housing and the absorber for sealing against water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958575.4A CN113588136B (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958575.4A CN113588136B (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113588136A CN113588136A (en) | 2021-11-02 |
| CN113588136B true CN113588136B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110958575.4A Active CN113588136B (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113588136B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543988B (en) * | 2022-02-23 | 2023-11-21 | 武汉锐科光纤激光技术股份有限公司 | Laser power meter |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL100528A0 (en) * | 1991-12-26 | 1992-09-06 | Ephraim Secemski | Laser power meter |
| CN104048755A (en) * | 2014-05-21 | 2014-09-17 | 西北核技术研究所 | Total absorption superlaser energy meter |
| CN203859378U (en) * | 2014-04-22 | 2014-10-01 | 北京瑞尔通激光科技有限公司 | Active cooling-type high-energy laser absorption device |
| CN105388549A (en) * | 2015-12-28 | 2016-03-09 | 中国工程物理研究院应用电子学研究所 | Active cooling high-energy laser absorbing device based on liquid absorption |
| CN105606214A (en) * | 2015-12-28 | 2016-05-25 | 湖南华曙高科技有限责任公司 | Device for calibrating laser power and method |
| CN107356630A (en) * | 2017-07-24 | 2017-11-17 | 南京工业大学 | Method for testing evolution law of polymer heat flow depth absorption coefficient |
| CN108279449A (en) * | 2017-01-05 | 2018-07-13 | 罗伯特·博世有限公司 | High power beam trap |
| CN213632420U (en) * | 2020-12-25 | 2021-07-06 | 许澍 | High-precision blackbody radiation source with improved target surface |
-
2021
- 2021-08-20 CN CN202110958575.4A patent/CN113588136B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL100528A0 (en) * | 1991-12-26 | 1992-09-06 | Ephraim Secemski | Laser power meter |
| CN203859378U (en) * | 2014-04-22 | 2014-10-01 | 北京瑞尔通激光科技有限公司 | Active cooling-type high-energy laser absorption device |
| CN104048755A (en) * | 2014-05-21 | 2014-09-17 | 西北核技术研究所 | Total absorption superlaser energy meter |
| CN105388549A (en) * | 2015-12-28 | 2016-03-09 | 中国工程物理研究院应用电子学研究所 | Active cooling high-energy laser absorbing device based on liquid absorption |
| CN105606214A (en) * | 2015-12-28 | 2016-05-25 | 湖南华曙高科技有限责任公司 | Device for calibrating laser power and method |
| CN108279449A (en) * | 2017-01-05 | 2018-07-13 | 罗伯特·博世有限公司 | High power beam trap |
| CN107356630A (en) * | 2017-07-24 | 2017-11-17 | 南京工业大学 | Method for testing evolution law of polymer heat flow depth absorption coefficient |
| CN213632420U (en) * | 2020-12-25 | 2021-07-06 | 许澍 | High-precision blackbody radiation source with improved target surface |
Non-Patent Citations (1)
| Title |
|---|
| 高能激光能量直接测量技术及其发展趋势;魏继锋;胡晓阳;张凯;孙利群;;红外与激光工程;20170725(07);全文 * |
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| CN113588136A (en) | 2021-11-02 |
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Effective date of registration: 20240612 Address after: 301, 302, 303, Building 2, Xiangyun, Wuxi Xishan Technology Entrepreneurship Park, No. 99 Furong Middle Third Road, Xishan Development Zone, Wuxi City, Jiangsu Province, 214000 Patentee after: Wuxi Excitation Beam Optoelectronic Instrument Co.,Ltd. Country or region after: China Address before: No.32, Section 1, Xianren Road, Youxian District, Mianyang City, Sichuan Province Patentee before: Sichuan Jiliang Photoelectric Instrument Co.,Ltd. Country or region before: China |