CN113588136A - Laser power meter - Google Patents
Laser power meter Download PDFInfo
- Publication number
- CN113588136A CN113588136A CN202110958575.4A CN202110958575A CN113588136A CN 113588136 A CN113588136 A CN 113588136A CN 202110958575 A CN202110958575 A CN 202110958575A CN 113588136 A CN113588136 A CN 113588136A
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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 30
- 238000010521 absorption reaction Methods 0.000 claims abstract description 27
- 230000017525 heat dissipation Effects 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 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
- 238000012545 processing Methods 0.000 claims description 4
- 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
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000000306 component Substances 0.000 description 4
- 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
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 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
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 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
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
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
Abstract
The invention discloses a laser power meter which mainly comprises an absorber and a shell. The core part is an absorber, is processed by a whole block of high-heat-conductivity material and comprises an absorption target surface, a flow guide assembly, a heat dissipation assembly and the like. The absorption target surface is opposite to the laser incident port of the shell, and the target surface comprises a series of concentric V-shaped circular grooves for improving the absorption rate of incident laser. The guide assembly comprises a group of guide column arrays, temperature sensors are respectively mounted at two ends of a hole between the guide columns, and the temperature of the hot end and the temperature of the cold end in the absorber can be measured. 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 to improve the heat dissipation efficiency. The shell is provided with a water inlet and a water outlet which are 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 is 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 measuring device, and particularly relates to a high-power laser power meter.
Background
In recent years, high-power laser technology has become mature and widely used in various fields. In the process, the output power of the laser is continuously improved, for example, in the fastest-developing fiber laser in recent years, the output power of a single module reaches more than ten thousand watts, and the output power of multimode laser breaks through 100 kW. With the increase of the laser power level, corresponding laser power measuring equipment needs to be equipped for performance monitoring and evaluation. The conventional high-power laser power meter generally adopts a calorimetric method to measure the laser power, but cannot meet the measurement requirements of the conventional high-power laser in the aspects of measurement accuracy, response speed and laser damage resistance. 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 temperature drift is easy to occur. In addition, the existing laser power meter has large thermal resistance in the heat conduction process, long heat balance time and slow response of the power meter. In addition, the existing laser power meter has low beam expanding ratio to incident laser, and the laser power density on an absorption surface is not uniformly distributed, so that the laser damage resistance is poor, and the probability of damage by laser in the measuring process is very high.
Therefore, it is very necessary to develop a new laser power meter to improve the measurement accuracy and response speed, and also to improve the laser damage resistance of the laser power meter to better meet the measurement requirement of the current high-power laser.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: 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 block of high-thermal-conductivity material, comprises an absorption target surface, a flow guide assembly, a heat dissipation assembly and the like, and can realize the functions of light absorption, light-heat conversion, heat energy conduction, measurement, cooling and the like.
The absorption target surface is opposite to the laser incident port of the shell and comprises a series of concentric V-shaped circular grooves, so that the absorption area of incident laser can be increased, the laser power density is reduced, and the laser damage resistance can be improved. The absorption target surface can also improve the absorption rate of laser through a surface treatment process, so that the measurement accuracy is improved.
The function of the flow-guiding assembly is to measure the temperature inside the absorption body. The flow guide assembly comprises a group of flow guide column arrays, and temperature sensors are respectively mounted 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. And according to the temperature difference between the hot end and the cold end, the power value of the laser to be detected can be obtained through further calculation and analysis.
The heat dissipation assembly is arranged in a running water environment and used for improving the heat dissipation efficiency of the absorber. The running water environment refers to an environment which is communicated with external cooling water and can continuously circulate.
The absorption target surface, the flow guide assembly and the heat dissipation assembly are sequentially arranged along the transmission direction of the laser to be detected and are integrated into a whole, and the absorption target surface, the flow guide assembly and the heat dissipation assembly are processed through a whole block of high-heat-conductivity material. Commonly used 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 housing includes a laser entrance port and an electrical connection port. The rear shell comprises a water inlet and a water outlet which are 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, so that the measurement and analysis of the laser power are realized.
And a sealing rubber ring is arranged at the joint of the rear shell and the absorber and is 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 assembly, so that the measurement of the temperature inside the absorber can be realized, and compared with the conventional method for measuring the surface temperature, the laser power meter has higher measurement accuracy and better stability.
2. The absorber of the laser power meter is processed by a whole block of high-thermal-conductivity material and comprises key functional modules such as an absorption target surface, a flow guide assembly, a heat dissipation assembly and the like, so that the problem of thermal resistance increase caused by assembly thermal contact of a conventional laser power meter is fundamentally avoided, and the response speed of the laser power meter is remarkably improved.
3. The invention adopts the target surface with the V-shaped circular groove structure to absorb the laser, and compared with the traditional plane structure, the laser power density can be greatly reduced, the laser damage threshold value is improved, the target surface absorptivity is improved, and the measurement error is reduced.
Drawings
Fig. 1 is a configuration diagram of an external form of a laser power meter according to an embodiment of the present invention;
fig. 2 is an internal structural view of a laser power meter according to an embodiment of the present invention;
FIG. 3 is a diagram of an absorber front end structure of a laser power meter according to an embodiment of the present invention;
fig. 4 is a structural diagram of an absorber rear end of a laser power meter according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail below with reference to an embodiment in the 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 absorption body 1 is placed inside the housing 2 and the two are fixed together by screws.
The absorber 1 is a core component of the laser power meter, is manufactured by processing a whole block of pure copper, and comprises key functional modules such as an absorption target surface 101, a flow guide component 102 and a heat dissipation component 103.
The front end of the absorber 1 is an absorption target 101 for absorbing the energy of the incident laser light and converting it into thermal energy. In order to improve the absorptivity of incident laser, the absorption target surface 101 is processed into a V-shaped circular groove structure with a sharp bottom, and a surface treatment process is performed on the absorption target surface 101 to improve the absorptivity of the laser.
The absorption body 1 further comprises a flow guiding member 102. The flow guide assembly 102 is a flow guide column array formed by arranging a series of flow guide columns with the same size at equal intervals, and a series of holes are formed between every two adjacent flow guide columns. The end of the flow guide column close to the target surface is a hot end, and the end close to the heat dissipation assembly is a cold end. A plurality of temperature sensors are respectively arranged at the hot end and the cold end of the hole between the adjacent flow guide columns, 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 through calculation, and the power of incident laser can be calculated.
The rear end of the absorber 1 is a heat dissipation assembly 103. The heat dissipation assembly 103 is a heat dissipation plate structure, i.e. a series of heat dissipation plates with equal thickness are arranged at equal intervals. The heat dissipation assembly 103 is placed in a circulating water environment to realize heat dissipation, and the temperature of the absorber 1 is ensured not to exceed the allowed maximum temperature, so that the safety and the normal function of the equipment are ensured.
The middle protruding part of the absorber 1 is a mounting flange and is used for mounting and fixing with the shell. The mounting flange comprises a sealing groove 5 for mounting a sealing rubber ring, and the cooling water is sealed in a closed space around the heat dissipation assembly, so that water leakage is avoided. A series of mounting holes are formed in the periphery of the mounting flange and used for achieving fixation with the shell through screws.
The housing 2 includes a front housing 201 and a rear housing 202. The middle position of the front end of the front shell 201 is provided with a hole as a laser incidence port 3 during measurement. The laser light entrance port 3 is provided concentrically with the absorption target surface 101 of the absorber 1. The side of the front housing 201 also includes an opening for passing an electrical cable connected to the temperature sensor and connecting to an external meter. The rear end of the rear shell 202 is provided with a water inlet 4 and a water outlet 3 respectively for connecting with an external water inlet pipe and an external water outlet pipe.
The shell 2 further comprises a fixing component 6 used for installing and fixing the laser power meter through a corresponding supporting component.
The working process of the laser power meter is as follows:
the laser to be detected is aligned to the laser entrance port 3 of the laser power meter for irradiation, 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 guide assembly 102, the temperature change of the flow guide column is caused, namely the temperature change generated by the absorption of laser energy in the absorber. The temperature signals are collected by a plurality of temperature sensors distributed at the hot end and the cold end, transmitted to an external instrument or a computer system connected with the temperature sensors and responsible for control and display, and subjected to further data analysis processing to obtain the laser power value to be detected. 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-described embodiments are merely illustrative of the embodiments of the present invention, and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solution of the present invention, which may be made by a person skilled in the art without departing from the design concept of the present invention, are intended to fall within the scope of the present invention, which is defined by the appended claims rather than the above description, and all changes which fall within the meaning and range of equivalency of the claims are therefore intended to be embraced therein and any reference signs in the claims are not to be construed as limiting the claims concerned.
Claims (5)
1. A laser power meter comprising an absorber and a housing; the absorber is arranged in the shell and is formed by processing a whole block of high-thermal-conductivity material and comprises an absorption target surface, a flow guide assembly and a heat dissipation assembly; the absorption target surface, the flow guide assembly and the heat dissipation assembly 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 incident port of the shell and comprises a series of concentric V-shaped circular grooves; the guide assembly comprises a group of guide column arrays formed by arranging the same guide columns at equal intervals, a series of holes are formed between every two adjacent guide columns, one end, close to the target surface, of each guide column is a hot end, one end, close to the heat dissipation assembly, of each guide column is a cold end, and the plurality of temperature sensors are respectively installed at the hot ends and the cold ends of the holes between the adjacent guide columns and used for measuring the temperature of the hot ends and the cold ends inside the absorber.
2. The laser power meter according to claim 1, wherein the heat dissipation assembly is disposed in a flowing water environment, wherein the flowing water environment is an environment which is communicated with external cooling water and can continuously circulate.
3. The laser power meter according to claim 1, wherein the housing comprises a front housing and a rear housing, the front housing comprises a laser entrance port and an electrical connection port, and the rear housing comprises a water inlet and a water outlet and is respectively communicated with external cooling water.
4. The laser power meter according to claim 1, wherein 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 the laser power.
5. The laser power meter according to claim 1, wherein a sealing rubber ring is arranged at a joint of the rear housing and the absorber, and is used for sealing and preventing water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958575.4A CN113588136A (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958575.4A CN113588136A (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113588136A true CN113588136A (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110958575.4A Pending CN113588136A (en) | 2021-08-20 | 2021-08-20 | Laser power meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113588136A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543988A (en) * | 2022-02-23 | 2022-05-27 | 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 | A kind of method of testing of polymer hot-fluid depth absorption coefficient development law |
| 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/CN113588136A/en active Pending
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 | A kind of method of testing of polymer hot-fluid depth absorption coefficient development law |
| CN213632420U (en) * | 2020-12-25 | 2021-07-06 | 许澍 | High-precision blackbody radiation source with improved target surface |
Non-Patent Citations (1)
| Title |
|---|
| 魏继锋;胡晓阳;张凯;孙利群;: "高能激光能量直接测量技术及其发展趋势", 红外与激光工程, no. 07, 25 July 2017 (2017-07-25) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543988A (en) * | 2022-02-23 | 2022-05-27 | 武汉锐科光纤激光技术股份有限公司 | Laser power meter |
| 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 |
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