Laser power meter

Abstract

The utility model discloses a laser power meter which comprises a spherical absorption cavity and a water pipe, the spherical absorption cavity comprises a laser entrance port, at least part of the water pipe is arranged on the outer surface of the spherical absorption cavity, the water pipe comprises a water pipe inlet and a water pipe outlet, and the water pipe inlet and the water pipe outlet are respectively provided with an inlet thermometer and an outlet thermometer. And a flow meter is arranged on the water pipe. According to the laser power meter, the laser damage resistance of the laser power meter can be improved, the measurement result is more stable and reliable, and the power accuracy of measurement can be improved.

Description

Technical Field

[0001] The utility model relates to the field of laser power measurement equipment, in particular to a laser power meter. Background Art

[0002] As the application scope of laser technology continues to expand in many key fields, the output power of lasers is also steadily increasing. Taking fiber lasers as an example, the power of a single fiber laser has exceeded 20kW. With the significant increase in laser power, corresponding laser power measurement instruments are needed to monitor and evaluate its performance.

[0003] The commonly used laser power meters mainly rely on calorimetric technology to determine the power of the laser. However, this method has not yet reached the standard to meet the needs of modern high-power laser measurement in terms of ensuring measurement accuracy, response speed and resistance to damage that may be caused by high-power lasers. Utility Model Content

[0004] The utility model provides a laser power meter, which has the characteristics of strong anti-laser damage ability, high power accuracy and fast response speed.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a laser power meter, which includes a spherical absorption cavity and a water pipe, the spherical absorption cavity includes a laser incident port, at least part of the water pipe is arranged on the outer surface of the spherical absorption cavity, the water pipe includes a water pipe inlet and a water pipe outlet, an inlet thermometer and an outlet thermometer are respectively provided at the water pipe inlet and the water pipe outlet, and a flow meter is also provided on the water pipe.

[0006] Optionally, the laser incident port is provided with a laser head mounting seat.

[0007] Optionally, the ratio of the diameter of the laser incident port to the inner diameter of the spherical absorption cavity is not greater than 0.05.

[0008] Optionally, the outer diameter of the spherical absorption cavity is 500-600 mm, the inner diameter is 480-580 mm, and the diameter of the laser incident port is 20-24 mm.

[0009] Optionally, the inner surface roughness of the spherical absorption cavity is 10-50 microns.

[0010] Optionally, the inner surface of the spherical absorption cavity is coated with a coating that absorbs laser light.

[0011] Optionally, the water pipe is arranged on the outer surface of the spherical absorption chamber in a spirally coiled manner.

[0012] Optionally, the outer surface of the spherical absorption chamber is provided with a groove for accommodating the water pipe, and the water pipe is embedded in the groove.

[0013] Optionally, the laser power meter further includes a heat insulation layer wrapped around the water pipe and the outside of the spherical absorption cavity.

[0014] Optionally, at least one of the spherical absorption chamber and the water pipe is made of copper or iron.

[0015] The beneficial effect of the utility model is that when measuring laser power, the laser power meter uses a water pipe to timely conduct away the heat of the spherical absorption cavity, cools the spherical absorption cavity, and prevents the spherical absorption cavity from being damaged due to excessive temperature, that is, it has a high ability to resist laser damage, prolongs the life of the laser power meter, and makes its measurement results more stable and reliable. In addition, the use of a spherical absorption cavity can make the laser energy absorbed by each area more uniform, thereby improving the accuracy of the measured power. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the laser power meter proposed by the utility model;

[0017] Figure 2 It is a schematic diagram of laser scattering inside the spherical absorption cavity proposed by the utility model.

[0018] In the figure: 1-water pipe inlet; 2-flow meter; 3-inlet thermometer; 4-water pipe; 5-spherical absorption cavity; 6-laser incident port; 7-outlet thermometer; 8-water pipe outlet; 9-thermal insulation layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that when an element is described as "fixed to", "fixed to", or "installed on" another element, it can be directly on the other element, or one or more intermediate elements can exist therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can exist therebetween. The terms "upper", "lower", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only. In this specification, the "installation" includes fixing or restricting a certain element or device to a specific position or place by welding, screwing, clamping, bonding, etc.

[0020] The utility model discloses a laser power meter, which realizes the measurement of laser power by measuring the flow rate and temperature change of water flowing through a spherical absorption cavity. The laser power meter can not only improve the anti-laser damage ability of the laser power meter, but also improve the power accuracy of the measurement, and the measurement result is more stable and reliable.

[0021] like Figure 1As shown, the utility model provides a laser power meter, including a water pipe 4 and a spherical absorption cavity 5, wherein the water pipe 4 is arranged on the outer surface of the spherical absorption cavity 5 and is closely attached to the spherical absorption cavity 5. The spherical absorption cavity 5 includes a laser incident port 6 for introducing the laser to be measured.

[0022] Optionally, a laser head mounting seat (not shown) is provided at the laser incident port 6 for fixing and mounting the laser head.

[0023] Optionally, the spherical absorption cavity 5 and the water pipe are both made of metal with high thermal conductivity as the base material, such as copper or iron, which can further improve the laser power meter's ability to resist laser damage while improving the heat conduction capacity. The outer diameter of the spherical absorption cavity 5 is 500-600 mm, the inner diameter is 480-580 mm, the diameter of the laser incident port 6 is 20-24 mm, and the ratio of the diameter of the laser incident port 6 to the inner diameter of the spherical absorption cavity 5 is not greater than 0.05, which can effectively prevent the laser to be measured from escaping from the spherical absorption cavity 5.

[0024] Optionally, the inner surface of the spherical absorption cavity 5 is roughened to a roughness of 10-50 microns, which is conducive to multiple reflections of the laser in the spherical absorption cavity 5, so that the laser energy absorbed by each area of ​​the spherical absorption cavity 5 is relatively uniform, thereby further improving the power accuracy of the measurement. Optionally, the inner surface of the spherical absorption cavity 5 is coated with a coating that absorbs laser light, such as carbon black or colloidal graphite, to enhance the absorption effect of the spherical absorption cavity 5 on the laser light.

[0025] The water pipe 4 includes a water pipe inlet 1 and a water pipe outlet 8, and an inlet thermometer 3 and an outlet thermometer 7 are respectively provided at the water pipe inlet 1 and the water pipe outlet 8 for real-time monitoring of water temperature changes. A flow meter 2 is also provided on the water pipe for measuring the flow value inside the water pipe 4. Optionally, the flow meter 2 is connected in series at the water pipe inlet 1.

[0026] Optionally, the water pipe 4 is arranged on the outer surface of the spherical absorption cavity 5 in a spiral winding manner. Optionally, the outer surface of the spherical absorption cavity 5 is provided with a groove for accommodating the water pipe 4, and the water pipe 4 is embedded in the groove, which can enhance the heat conduction between the water pipe 4 and the spherical absorption cavity 5 and improve the measurement accuracy. Optionally, the laser power meter also includes a heat insulation layer 9, which is wrapped around the outside of the water pipe 4 and the spherical absorption cavity 5 to thermally isolate the laser power meter from the external environment.

[0027] like Figure 2As shown, when the laser beam irradiates the inner wall of the spherical absorption cavity 5, the laser is partially absorbed and reflected and scattered multiple times until the total energy of the laser is evenly distributed in the entire inner cavity. A water pipe 4 is arranged on the outside of the spherical absorption cavity 5, which is tightly fitted with the spherical absorption cavity 5, so that the heat absorbed by the spherical absorption cavity 5 from the laser is efficiently transferred to the water in the pipe through the water pipe 4. The flowing water can cool the spherical absorption cavity 5 in time, which has a good protective effect on the spherical absorption cavity 5. According to the law of conservation of energy, P×t=C×m×ΔT=C×ρ×V×ΔT=C×ρ×L×t×ΔT, the power of the laser can be calculated from the measured flow value and the temperature difference between the water pipe inlet and the water pipe outlet. Among them, P is the laser power, t is the laser opening time, C is the specific heat capacity of water, m is the mass of water, ΔT is the temperature difference between the water pipe inlet and the water pipe outlet, ρ is the density of water, V is the volume of water, and L is the flow rate of water.

[0028] The laser power meter can not only improve the laser damage resistance of the laser power meter, making the measurement result more stable and reliable, but also improve the power accuracy of the measurement.

[0029] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A laser power meter, characterized in that: The laser power meter includes a spherical absorption cavity and a water pipe, the spherical absorption cavity includes a laser incident port, at least part of the water pipe is arranged on the outer surface of the spherical absorption cavity, the water pipe includes a water pipe inlet and a water pipe outlet, an inlet thermometer and an outlet thermometer are respectively arranged at the water pipe inlet and the water pipe outlet, and a flow meter is also arranged on the water pipe.

2. The laser power meter according to claim 1, characterized in that: The laser incident port is provided with a laser head mounting seat.

3. The laser power meter according to claim 1, characterized in that: The ratio of the diameter of the laser incident port to the inner diameter of the spherical absorption cavity is not greater than 0.

05.

4. The laser power meter according to claim 3, characterized in that: The outer diameter of the spherical absorption cavity is 500-600 mm, the inner diameter is 480-580 mm, and the diameter of the laser incident port is 20-24 mm.

5. The laser power meter according to claim 1, characterized in that: The inner surface roughness of the spherical absorption cavity is 10-50 microns.

6. The laser power meter according to claim 1 or 5, characterized in that: The inner surface of the spherical absorption cavity is coated with a coating that absorbs laser light.

7. The laser power meter according to claim 1, characterized in that: The water pipe is arranged on the outer surface of the spherical absorption chamber in a spirally coiled manner.

8. The laser power meter according to claim 1, characterized in that: The outer surface of the spherical absorption chamber is provided with a groove for accommodating the water pipe, and the water pipe is embedded in the groove.

9. The laser power meter according to claim 1, characterized in that: The laser power meter also includes a heat insulation layer wrapped around the water pipe and the outer side of the spherical absorption cavity.

10. The laser power meter according to claim 1, characterized in that: At least one of the spherical absorption chamber and the water pipe is made of copper or iron.

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