Laser experimental apparatus for measuring laser power reduction in submerged environment

Abstract

A laser experimental apparatus for measuring laser power reduction in a submerged environment, belonging to the technical field of laser measurement devices. The apparatus comprises an experimental platform (1), a laser generation system, and an experimental system. The experimental system comprises a submerging container (17) and a laser power reduction measurement assembly. A liquid medium is stored in the submerging container (17), and a sample is submerged in the liquid medium. The laser power reduction measurement assembly is located below the submerging container (17). Laser light emitted by a laser head (19) is irradiated on the sample in the submerging container (17), and the laser power reduction measurement assembly is used to measure a reduction in power of the laser light passing through the liquid medium. In the apparatus, laser power and a degree of energy reduction thereof in different liquid media can be explored, thereby investigating the impact of different liquid media on reductions in laser power, identifying the optimal laser power corresponding to each liquid medium, accordingly adjusting a laser-assisted rock breaking policy in a drilling process, and providing effective data for laser-assisted rock breaking in a liquid environment.

Description

A laser experimental apparatus for measuring laser power reduction in a flooded environment Technical Field

[0001] This invention belongs to the field of laser measurement equipment technology, specifically relating to a laser experimental device for measuring laser power reduction in a flooded environment. Background Technology

[0002] Traditional laser experimental setups typically involve the laser beam propagating in the air, and the measurement environment differs significantly from the actual application environment. In particular, in submerged environments, the laser power is significantly reduced due to the refraction, absorption, and scattering properties of water. Therefore, traditional laser experimental setups often struggle to accurately measure the reduction in laser power in submerged environments, which limits the application of laser technology in certain specific fields, such as laser rock breaking.

[0003] Laser-assisted drilling (LAD) technology, as an emerging drilling method, has promising applications in oil and gas extraction. However, during oil and gas drilling, liquid media (such as water and drilling fluid) typically fill the wellbore, significantly impacting laser propagation and power transmission. When the laser penetrates the liquid medium, power reduction occurs due to refraction, scattering, and absorption, resulting in a substantial decrease in the laser power reaching the rock surface. In practical applications, laser power reduction is often difficult to measure accurately and adjust in real time, affecting drilling efficiency and operational safety. Currently, there is no experimental device for studying laser rock breaking in a flooded environment that can effectively study liquid reduction. Therefore, this invention provides a device capable of measuring laser reduction, experimentally studying the degree of laser reduction after passing through a liquid, and providing a valid theoretical basis for laser rock breaking. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a laser experimental apparatus for measuring laser power reduction in a flooded environment, thereby resolving the issues in the prior art. The technical solution adopted by this invention is as follows:

[0005] A laser experimental apparatus for measuring laser power reduction in a flooded environment includes an experimental platform, a laser generation system, and an experimental system;

[0006] The laser generating system includes a laser head;

[0007] The experimental system includes a submersion container and a laser power reduction measurement component; the submersion container is located in the middle experimental chamber, and the submersion container contains a liquid medium for submerging the sample in the liquid medium; the laser power reduction measurement component is located below the submersion container;

[0008] The experimental platform includes a cabinet, inside which a glass partition and a lower partition are fixedly installed. The glass partition is located above the lower partition, and the glass partition and the lower partition divide the interior of the cabinet into a lower control chamber, a middle experimental chamber and an upper monitoring chamber from bottom to top.

[0009] The laser emitted by the laser head passes through the glass partition from top to bottom and irradiates the sample in the submerged container. The laser power reduction measurement component is used to measure the degree of power reduction of the laser passing through the liquid medium.

[0010] Furthermore, the laser generating system also includes a fiber laser, an optical path adjustment device, and a water chiller;

[0011] The fiber laser is installed in the lower control cavity and is connected to the optical path adjustment device via an optical fiber. The optical path adjustment device is installed in the upper monitoring cavity and its output is connected to the laser head. The fiber laser is connected to the water chiller. An opening is provided on the glass partition for the laser head to pass through.

[0012] Furthermore, the optical path adjustment device includes a housing, an input optical fiber, a water inlet, and a water outlet;

[0013] The outer shell is fixed in the lower control cavity. A liquid flow channel is provided inside the outer shell, which connects the water inlet and the water outlet for cooling circulation. A lens group is provided inside the outer shell. The top of the outer shell is connected to the input optical fiber, and the bottom of the outer shell is connected to the laser head.

[0014] Furthermore, the water chiller is equipped with a cooling water tank and a submerged liquid water tank. One side of the cooling water tank is connected to a heating closed-loop water circuit, which is fitted onto the submerged liquid water tank. The other side of the cooling water tank is connected to a cooling closed-loop water circuit via a connecting water pipe, which surrounds the fiber laser.

[0015] Furthermore, it also includes a blowing system, which includes a gas tank, a gas delivery pipe, and a blowing head; the gas tank is connected to the blowing head through the gas delivery pipe, the blowing head is installed in the middle experimental chamber, and the blowing end of the blowing head faces the output end of the laser head, and the blowing direction can be adjusted through the pipe according to experimental needs.

[0016] Furthermore, the submerged container is connected to a water pump through an inlet and an outlet. The submerged container is provided with scale lines, and a through hole is provided at the bottom of the submerged container. A coating sheet for laser penetration is fixedly connected inside the through hole.

[0017] Furthermore, it also includes a monitoring system, which includes a camera, an infrared thermometer, and a searchlight. The camera and the infrared thermometer are installed in the upper monitoring cavity, and the searchlight is installed in the middle experimental cavity.

[0018] Furthermore, the laser power reduction measurement component includes a vertically arranged diffuser tube and a support tube. The top of the diffuser tube is detachably connected to a support glass plate, on which the submerged container is placed. The bottom of the diffuser tube is connected to the support tube, and an expansion liquid medium is disposed inside the support tube.

[0019] The laser emitted from the laser head is used to irradiate the expanding liquid medium, and the power reduction of the laser is reflected by the volume change of the expanding liquid medium.

[0020] Furthermore, a diffusion glass stage is provided inside the diffusion tube. The diffusion glass stage has a conical structure, with its bottom abutting against the intermediate ring and its top abutting against the supporting glass plate.

[0021] The intermediate ring is located between the diffuser tube and the support tube, and the hollow portion of the intermediate ring is used for laser to pass through.

[0022] Furthermore, a heat-insulating piston plate is slidably disposed inside the support tube, and a return spring is abutted below the heat-insulating piston plate. The expanding liquid medium is located between the diffusion glass stage and the heat-insulating piston plate.

[0023] A heat-conducting block is fixedly connected to the top of the heat-insulating piston plate. The top of the heat-conducting block has a conical structure, and the heat-conducting block is coaxially arranged with the diffusion glass stage.

[0024] A measuring component for measuring the displacement change is provided below the heat-insulating piston plate.

[0025] The present invention has the following beneficial effects:

[0026] (1) As a device for measuring laser reduction, this invention can explore the degree of reduction of laser power and energy under different liquid media, explore the influence of different liquid media on the reduction of laser power, find the optimal laser power for the corresponding liquid media, adjust the laser-assisted rock breaking strategy during drilling, and provide effective data for laser rock breaking mining in liquid environments.

[0027] (2) This invention can simulate the laser rock breaking process in the liquid flooding environment of oil and gas drilling in the room, measure the reduction of laser power by different depths, types and temperatures of liquid media, and adjust the laser output parameters according to the feedback, and observe the laser rock breaking effect under different flooding conditions. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is a top view of the upper monitoring cavity;

[0030] Figure 3 is a top view of the middle layer experimental chamber;

[0031] Figure 4 is a schematic diagram of the entire submerged container;

[0032] Figure 5 is a schematic diagram of the laser cooling structure;

[0033] Figure 6 is a schematic diagram of the optical path adjustment device;

[0034] Figure 7 is a schematic diagram of the laser power reduction measurement component.

[0035] In the diagram: 1-Experimental platform, 2-Lower control chamber, 3-Middle experimental chamber, 4-Upper monitoring chamber, 5-Main control screen, 6-Control system host, 7-Fiber laser, 8-Water chiller, 9-Gas tank, 10-Valve, 11-Pressure gauge, 12-Gas delivery pipeline, 13-Air blowing head, 14-Support tube, 15-Diffuser tube, 16-Diffuser glass stage, 17-Submerged container, 18-Coated sheet, 19-Laser head, 20-Optical path adjustment device, 21-Opening, 22-Searchlight, 23-First camera, 29-Second camera, 24-First infrared thermometer, 30-Second infrared thermometer, 25-Exhaust port, 26-Glass partition, 27-Lower partition, 28-Water pump, 141-Intermediate ring, 142-Base plate, 143-Expanding liquid medium, 144-Heat-conducting block, 145-Heat-insulating piston Plate, 146-Reset spring, 147-Measuring component, Supporting glass plate-151, 71-Cooling water inlet, 72-Cooling water outlet, 73-Cooling closed-loop water circuit, 81-Connecting water pipe, 82-Cooling water tank, 83-Submerged liquid water tank, 84-First cooling pipe interface, 85-Second cooling pipe interface, 86-First heating pipe interface, 87-Second heating pipe interface, 88-First temperature display, 89-Second temperature display, 810-Heating closed-loop water circuit, 811-Water tank inlet, 812-Water tank outlet, 171-Scale line, 173-Inlet, 172-Outlet, 201-Input fiber optic cable, 202-Inlet, 203-Outlet, 204-Collimating lens, 205-Focusing lens, 206-Protective lens, 207-Laser beam, 208-Outer shell. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to Figures 1-7 in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0037] As shown in Figure 1, a laser experimental apparatus for measuring laser power reduction in a flooded environment includes an experimental platform 1, a laser generation system, and an experimental system.

[0038] The laser generating system includes a laser head 19;

[0039] The experimental system includes a submersion container 17 and a laser power reduction measurement component; the submersion container 17 is located inside the middle experimental chamber 3, and the submersion container 17 contains a liquid medium for submerging the sample in the liquid medium; the laser power reduction measurement component is located below the submersion container 17;

[0040] The experimental platform 1 includes a cabinet, in which a glass partition 26 and a lower partition 27 are fixedly installed. The glass partition 26 is located above the lower partition 27. The glass partition 26 and the lower partition 27 divide the interior of the cabinet into a lower control chamber 2, a middle experimental chamber 3 and an upper monitoring chamber 4 from bottom to top.

[0041] The laser emitted by the laser head 19 passes through the glass partition 26 from top to bottom and irradiates the sample inside the submerged container 17. The laser power reduction measurement component is used to measure the degree of power reduction of the laser passing through the liquid medium.

[0042] The laser head 19 is a prior art technology used to emit high-energy laser light to irradiate the rock sample for laser rock breaking experiments. The submerged container 17 is used to hold different liquid media, which submerge the rock sample, so that the laser emitted by the laser head 19 can perform laser rock breaking experiments on the sample submerged in the liquid environment.

[0043] This invention, as a device for measuring laser power reduction, addresses the issue of varying absorption rates of high-energy lasers by different liquid media. It incorporates a laser power reduction measurement component to investigate the degree of laser power and energy reduction under different liquid media and volumes. Based on this reduction, the power of the laser head 19 is adjusted to its optimal power, placing the rock sample in the best experimental environment. Through experiments conducted using this invention, the influence of different liquid media on laser power reduction can be investigated, identifying the optimal laser power for the corresponding liquid medium. This allows for adjustments to the laser-assisted rock-breaking strategy during drilling, providing valuable data for laser rock-breaking mining in liquid environments.

[0044] This invention can simulate the laser rock-breaking process in a liquid-flooded environment during oil and gas drilling indoors. It measures the reduction of laser power by different depths, types, and temperatures of liquid media, and adjusts the laser output parameters based on feedback. It allows observation of the laser rock-breaking effect under different flooding conditions, demonstrating strong functionality. It can also be used to study the influence of the flooding environment on laser power and the laser rock-breaking process, thus improving the theory of laser rock-breaking under liquid-flooded conditions.

[0045] Furthermore, the laser generating system also includes a fiber laser 7, an optical path adjustment device 20, and a water chiller 8;

[0046] The fiber laser 7 is installed in the lower control cavity 2. The fiber laser 7 is connected to the optical path adjustment device 20 via an optical fiber. The optical path adjustment device 20 is installed in the upper monitoring cavity 4. The output end of the optical path adjustment device 20 is connected to the laser head 19. The fiber laser 7 is connected to the water chiller 8. The glass partition 26 is provided with an opening 21 for the laser head 19 to pass through.

[0047] The fiber laser 7 is existing technology and is used to provide a laser source for the laser head 19. The optical path adjustment device 20 can use a collimated laser from the prior art, or it can adopt the following structure:

[0048] As shown in Figure 6, the optical path adjustment device 20 includes a housing 208, an input optical fiber 201, a water inlet 202, and a water outlet 203;

[0049] The outer shell 208 is fixed inside the lower control cavity 2. A liquid flow channel is provided inside the outer shell 208, which connects the water inlet 202 and the water outlet 203 for cooling circulation. A lens group is provided inside the outer shell 208. The top of the outer shell 208 is connected to the input optical fiber 201, and the bottom of the outer shell 208 is connected to the laser head 19.

[0050] The lens assembly includes a collimating lens 204, a focusing lens 205, and a protective lens 206, arranged sequentially from top to bottom inside the housing 208; these are used for laser collimation and focusing. The water inlet 202 and outlet 203 can be connected to components such as a water pump and a cooling tank via pipes, allowing the liquid to circulate within the liquid channels of the housing 208 to achieve a cooling function.

[0051] As shown in Figure 5, the water chiller 8 is equipped with a cooling water tank 82 and a submerged liquid water tank 83. One side of the cooling water tank 82 is connected to a heating closed-loop water circuit 810, which is fitted onto the submerged liquid water tank 83. The other side of the cooling water tank 82 is connected to a cooling closed-loop water circuit 73 via a connecting water pipe 81, which surrounds the fiber laser 7.

[0052] The heating closed-loop water circuit 810 is connected to the cooling water tank 82 via the first heating pipe interface 86 and the second heating pipe interface 87. The cooling closed-loop water circuit 73 is connected to the corresponding connecting water pipes 81 via the cooling water inlet 71 and the cooling water outlet 72. The connecting water pipes 81 are connected to the cooling water tank 82 via the first cooling pipe interface 84 and the second cooling pipe interface 85, respectively. The submerged liquid water tank 83 has a water tank inlet 811 at its top and a water tank outlet 812 at its bottom.

[0053] The cooling closed-loop water path 73 can be located inside or outside the fiber laser 7 to form a water-cooling cycle. This effectively cools the fiber laser 7 and recovers waste heat. The heating closed-loop water path 810 surrounds the submerged liquid tank 83 and can use the recovered waste heat to heat the submerged liquid as needed. The liquid temperature can be monitored by a first temperature display 88 and a second temperature display 89.

[0054] Furthermore, it also includes a blowing system, which includes a gas tank 9, a gas delivery pipe 12, and a blowing head 13; the gas tank 9 is connected to the blowing head 13 through the gas delivery pipe 12, and the blowing head 13 is installed in the middle experimental chamber 3, with the blowing end of the blowing head 13 facing the output end of the laser head 19, and the blowing direction can be adjusted through the gas delivery pipe 12 according to experimental needs.

[0055] The gas cylinder is connected to a valve 10 and a pressure gauge 11, which can adjust the gas pressure. This is used to remove water vapor and impurities during the experiment. The gas can be discharged through the exhaust port 25 to maintain the gas pressure balance in the experimental chamber.

[0056] Furthermore, the submerged container 17 is connected to a water pump 28 via an inlet 173 and an outlet 172. The submerged container 17 is equipped with graduation lines 171, and a through hole is provided at its bottom. A coated sheet 18 for laser transmission is fixedly connected within the through hole. The coated sheet 18 is made of highly transparent material, effectively allowing laser light to pass through, facilitating laser power reduction rate measurement. The water pump 28 can be connected to a water tank, enabling the replacement of the liquid medium within the submerged container 17 via the inlet 173 and outlet 172.

[0057] Furthermore, it also includes a monitoring system, which includes a camera, an infrared thermometer, and a searchlight 13. The camera and the infrared thermometer are installed in the upper monitoring cavity 4, and the searchlight 13 is installed in the middle experimental cavity 3.

[0058] As shown in Figure 2, two cameras and infrared thermometers can be set up, namely a first camera 23, a second camera 29, a first infrared thermometer 24, and a second infrared thermometer 30. The first camera 23 and the second camera 29 are pointed towards the sample to capture real-time changes in the sample. The first infrared thermometer 24 and the second infrared thermometer 30 are used to measure the temperature changes of the sample. The searchlight 13 has an adjustable light color to assist in imaging.

[0059] As shown in Figure 7, the laser power reduction measurement component includes a vertically arranged diffuser tube 15 and a support tube 14. The top of the diffuser tube 15 is detachably connected to a support glass plate 151 by bolts. The submerged container 17 is placed on the support glass plate 151. The bottom of the diffuser tube 15 is connected to the support tube 14. An expansion liquid medium 143 is provided inside the support tube 14.

[0060] The laser emitted by the laser head 19 is used to irradiate the expanding liquid medium 143. The reduced laser power is calculated by the volume change of the expanding liquid medium 143, reflecting the degree of laser power reduction.

[0061] The diffuser tube 15 and the support tube 14 are hollow tube structures and are coaxially distributed. The support glass plate 151 serves to support the submerged container 17. This invention reflects the power reduction of the laser by the volume change of the expanding liquid medium 143. When different liquid media are placed in the submerged container 17, the volume change rate of the expanding liquid medium 143 is different.

[0062] Furthermore, a diffusion glass stage 16 is provided inside the diffusion tube 15. The diffusion glass stage 16 has a conical structure. The bottom of the diffusion glass stage 16 abuts against the intermediate ring 141, and the top of the diffusion glass stage 16 abuts against the supporting glass plate 151.

[0063] The intermediate ring 141 is located between the diffuser tube 15 and the support tube 14, and the hollow portion of the intermediate ring 141 is used for laser to pass through.

[0064] The intermediate ring 141 can be bolted to connect the diffuser tube 15 and the support tube 14. The top and bottom of the diffuser glass stage 16 are respectively secured by the support glass plate 151 and the intermediate ring 141. The bottom of the diffuser glass stage 16 can be configured as a cylindrical structure, and a corresponding sealing ring is provided to achieve a sealing structure below the diffuser glass stage 16, preventing the expanding liquid medium 143 from entering the diffuser tube 15.

[0065] The diffuser tube 15, support tube 14, diffuser glass stage 16, intermediate ring 141, heat-conducting block 144 and laser head 19 are coaxially arranged. When no sample is placed in the submerged container 17, but only the liquid medium is placed, the laser emitted by the laser head 19 passes through the liquid medium, the coating 18, the diffuser glass stage 16, the intermediate ring 141 in sequence and finally irradiates the expanding liquid medium 143 and the heat-conducting block 144.

[0066] The function of the diffusion glass stage 16 is to cause the laser beam to refract and diffuse when it is irradiated at its top vertex and emitted, thereby forming a circular spot with an expanded diameter. The circular spot then irradiates the expansion liquid medium 143 and the heat-conducting block 144, thereby dispersing the energy of the laser beam, making the expansion liquid medium 143 and the heat-conducting block 144 more uniformly heated, and decomposing the energy concentration of the laser beam to prevent the laser beam from penetrating the heat-conducting block 144.

[0067] Furthermore, a heat-insulating piston plate 145 is slidably disposed inside the support tube 14, and a return spring 146 is abutted below the heat-insulating piston plate 145. The expansion liquid medium 143 is located between the diffusion glass stage 16 and the heat-insulating piston plate 145.

[0068] The heat-insulating piston plate 145 is fixedly connected to the top of the heat-conducting block 144, the top of the heat-conducting block 144 is conical, and the heat-conducting block 144 is coaxially arranged with the diffusion glass stage 16.

[0069] A measuring component 147 for measuring the displacement change of the heat-insulating piston plate 145 is provided below the heat-insulating piston plate 145.

[0070] The bottom of the support tube 14 is bolted to the base plate 142, and the bottom of the return spring 146 abuts against the base plate 142. The base plate 142 is fixed to the lower partition 27. The measuring component 147 is existing technology, such as a photoelectric sensor or a distance sensor. The heat-conducting block 144 performs the function of absorbing and conducting heat to heat the expanding liquid medium 143.

[0071] The specific working principle of the laser power reduction measurement component is as follows: When it is necessary to measure the laser reduction rate of the liquid medium in the submerged container 17, the liquid medium is placed in the submerged container 17 without placing a sample. The laser irradiation time t is set. During time t, the laser emitted by the laser head 19 passes through the liquid medium, the coating plate 18, the diffusion glass stage 16, the intermediate ring 141 in sequence, and finally irradiates the expanding liquid medium 143 and the heat-conducting block 144. The energy of the laser beam causes the temperature of the expanding liquid medium 143 and the heat-conducting block 144 to rise. At the same time, the volume of the expanding liquid medium 143 gradually increases, so the heat-insulating piston plate 145 moves downward and compresses the return spring 146. After time t is reached, the measuring component 147 records the displacement of the heat-insulating piston plate 145, which is the volume change of the expanding liquid medium 143.

[0072] By pre-emptively filling the submerged container 17 with no internal medium, the displacement of the heat-insulating piston plate 145 under this empty experimental environment is measured. Then, using this position as a reference example, the displacement changes of the heat-insulating piston plate 145 with the same volume but different liquid media are used as experimental examples. Thus, the displacement change ratio between the experimental examples and the reference examples can be obtained. Through this ratio, the actual laser power after the laser passes through the liquid medium can be roughly calculated, which reflects the degree of laser beam attenuation under different liquid media. This can help adjust the rock-breaking strategy and determine which liquid medium has a lower laser attenuation rate.

[0073] In addition, the support pipe 14 is also equipped with an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are connected to the corresponding pump body and water tank. When the liquid medium in the submerged container 17 is replaced, the high-temperature expansion liquid medium 143 in the support pipe 14 needs to be replaced to keep the initial temperature of the expansion liquid medium 143 the same. In specific implementation, the low-temperature high-temperature expansion liquid medium 143 is introduced by the pump body to replace the high-temperature high-temperature expansion liquid medium 143 until the heat insulation piston plate 145 returns to the initial position.

[0074] The present invention also includes a control system, which includes a main control screen 5 connected to the outside of the experimental platform 1 and a control system host 6 arranged in the lower control cavity 2. The host 6 is connected to other parts through cables to realize adjustment and control.

[0075] The experimental process of laser-assisted rock breaking in this invention is as follows:

[0076] S1. Place the sample in the submerged container 17, turn on the control system, fiber laser 7, water chiller 8, and valve 10, set the laser parameters through the main control screen 5, start the fiber laser 7, and emit a laser beam through the laser head 19.

[0077] S2 sets the water inlet flow rate, and water pump 28 pumps water to raise the liquid level in the submerged container 17 to a certain height, submerging the top of the rock sample. Then, the water inlet valve is closed to maintain the liquid level.

[0078] After the rock is soaked for the predetermined time, S4 starts the fiber laser 7, the laser head 19 emits a laser beam, and at the same time starts the air blowing system, the searchlight 22, the first camera 23, the second camera 29, the first infrared thermometer 24, and the second infrared thermometer 30.

[0079] After the predetermined irradiation time is reached by S5, the fiber laser 7 and the air blowing system are turned off, and the first camera 23, the second camera 29, the first infrared thermometer 24, and the second infrared thermometer 30 are also turned off, and the experimental data is stored.

[0080] After the S5 experiment is completed, open the inlet 173 and outlet 174 to drain the submerged liquid and rinse the submerged container with clean water.

[0081] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, substitutions, or variations made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A laser experiment apparatus for measuring laser power attenuation in a submerged environment, characterized by, Includes experimental platform (1), laser generation system and experimental system; The laser generating system includes a laser head (19); The experimental system includes a submersion container (17) and a laser power reduction measurement component; the submersion container (17) is located inside the middle experimental chamber (3), and the submersion container (17) contains a liquid medium for submerging the sample in the liquid medium; the laser power reduction measurement component is located below the submersion container (17); The experimental platform (1) includes a cabinet, in which a glass partition (26) and a lower partition (27) are fixedly installed. The glass partition (26) is located above the lower partition (27). The glass partition (26) and the lower partition (27) divide the interior of the cabinet into a lower control chamber (2), a middle experimental chamber (3) and an upper monitoring chamber (4) from bottom to top. The laser emitted by the laser head (19) passes through the glass partition (26) from top to bottom and irradiates the sample inside the submerged container (17). The laser power reduction measurement component is used to measure the degree of power reduction of the laser passing through the liquid medium.

2. The apparatus of claim 1, wherein, The laser generating system also includes a fiber laser (7), an optical path adjustment device (20), and a water chiller (8); The fiber laser (7) is installed in the lower control cavity (2). The fiber laser (7) is connected to the optical path adjustment device (20) through an optical fiber. The optical path adjustment device (20) is installed in the upper monitoring cavity (4). The output end of the optical path adjustment device (20) is connected to the laser head (19). The fiber laser (7) is connected to the water chiller (8). The glass partition (26) is provided with an opening (21) through which the laser head (19) passes.

3. The apparatus of claim 2, wherein, The optical path adjustment device (20) includes a housing (208), an input optical fiber (201), a water inlet (202), and a water outlet (203); The outer shell (208) is fixed inside the lower control cavity (2). A liquid flow channel is provided inside the outer shell (208), which connects the water inlet (202) and the water outlet (203) for cooling circulation. A lens group is provided inside the outer shell (208). The top of the outer shell (208) is connected to the input optical fiber (201), and the bottom of the outer shell (208) is connected to the laser head (19).

4. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 2, characterized in that, The water chiller (8) is equipped with a cooling water tank (82) and a submerged liquid water tank (83). One side of the cooling water tank (82) is connected to a heating closed-loop water circuit (810), which is fitted onto the submerged liquid water tank (83). The other side of the cooling water tank (82) is connected to a cooling closed-loop water circuit (73) via a connecting water pipe (81), which surrounds the fiber laser (7).

5. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 1, characterized in that, It also includes a blowing system, which includes a gas tank (9), a gas delivery pipe (12) and a blowing head (13); the gas tank (9) is connected to the blowing head (13) through the gas delivery pipe (12), the blowing head (13) is installed in the middle layer experimental chamber (3), and the blowing end of the blowing head (13) faces the output end of the laser head (19).

6. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 1, characterized in that, The submerged container (17) is connected to the water pump (28) through the inlet (173) and outlet (172). The submerged container (17) is provided with scale lines (171). The bottom of the submerged container (17) is provided with a through hole, and a coating sheet (18) for laser to pass through is fixedly connected in the through hole.

7. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 1, characterized in that, It also includes a monitoring system, which includes a camera, an infrared thermometer and a searchlight (13). The camera and the infrared thermometer are installed in the upper monitoring cavity (4) and the searchlight (13) is installed in the middle experimental cavity (3).

8. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 1, characterized in that, The laser power reduction measurement component includes a vertically arranged diffuser tube (15) and a support tube (14). The top of the diffuser tube (15) is detachably connected to a support glass plate (151). The submerged container (17) is placed on the support glass plate (151). The bottom of the diffuser tube (15) is connected to the support tube (14). An expanding liquid medium (143) is provided inside the support tube (14). The laser emitted by the laser head (19) is used to irradiate the expanding liquid medium (143), and the power reduction of the laser is reflected by the volume change of the expanding liquid medium (143).

9. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 8, characterized in that, A diffusion glass stage (16) is provided inside the diffusion tube (15). The diffusion glass stage (16) has a conical structure. The bottom of the diffusion glass stage (16) abuts against the intermediate ring (141), and the top of the diffusion glass stage (16) abuts against the supporting glass plate (151). The intermediate ring (141) is located between the diffuser tube (15) and the support tube (14), and the hollow part of the intermediate ring (141) is used for laser to pass through.

10. The laser experimental apparatus for measuring laser power reduction in a flooded environment according to claim 9, characterized in that, A heat-insulating piston plate (145) is slidably disposed inside the support tube (14), and a return spring (146) is abutted below the heat-insulating piston plate (145). The expansion liquid medium (143) is located between the diffusion glass stage (16) and the heat-insulating piston plate (145). The heat-insulating piston plate (145) is fixedly connected to the top of the heat-conducting block (144), the top of the heat-conducting block (144) is conical, and the heat-conducting block (144) is coaxially arranged with the diffusion glass stage (16); A measuring component (147) for measuring the displacement change is provided below the heat-insulating piston plate (145).

Images