Laser experiment device for measuring laser power reduction in submerged environment

Abstract

The invention belongs to the technical field of laser measurement equipment, and provides a laser experiment device for measuring laser power reduction in a submerged environment, which comprises an experiment platform, a laser generation system and an experiment system, the experiment system comprises a submerging container and a laser power reduction measuring assembly. A liquid medium is stored in the submerged container, and the sample is submerged in the liquid medium; the laser power reduction measuring assembly is located below the submerging container. Laser emitted by the laser head irradiates a sample in the submerged container, and the laser power reduction measuring assembly is used for measuring the power reduction of the laser penetrating through the liquid medium; as a device for measuring laser reduction, the laser reduction degree of laser power and energy under different liquid media can be explored, the reduction influence of different liquid media on the laser power can be explored, the optimal laser power corresponding to the liquid media can be found, the laser-assisted rock breaking strategy in the drilling process can be correspondingly adjusted, and the drilling efficiency is improved. And effective data can be provided for laser-assisted rock breaking in a liquid environment.

Description

Technical Field

[0001] The invention belongs to the technical field of laser measurement equipment, and in particular relates to a laser experimental device for measuring laser power reduction in a submerged environment. Background Art

[0002] Traditional laser experimental devices usually propagate laser beams in the air. The measurement environment is quite different from the actual application environment, especially in a submerged environment. Due to the refraction, absorption and scattering characteristics of water, the laser power will be significantly reduced. Therefore, traditional laser experimental devices often find it difficult to accurately measure the reduction of laser power in a submerged environment. This limits the application of laser technology in certain specific fields, such as laser rock breaking.

[0003] As an emerging drilling method, laser-assisted drilling technology has a reliable application prospect in oil and gas production. However, in the process of oil and gas drilling, liquid media (such as water, drilling fluid, etc.) are usually filled in the wellbore, which has a significant impact on the propagation of the laser and the transfer of power. When the laser penetrates the liquid medium, the power is reduced due to the refraction, scattering and absorption of the liquid, which greatly reduces the laser power reaching the rock surface. In practical applications, the reduction of laser power is often difficult to accurately measure and adjust in real time, which affects the drilling efficiency and operation safety. At present, there is no laser rock breaking experimental device in a submerged environment that can study liquid reduction. Therefore, the present invention provides a device that can measure laser reduction, and studies the degree of reduction of the laser after passing through the liquid through an experimental method, providing an effective theoretical basis for laser rock breaking. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a laser experimental device for measuring laser power reduction in a submerged environment to solve the problems in the prior art. The technical solution adopted by the present invention is: A laser experimental device for measuring laser power reduction in a submerged environment, comprising an experimental platform, a laser generating system and an experimental system; The laser generating system comprises a laser head; The experimental system comprises a submerged container and a laser power reduction measurement component; the submerged container is located in the middle layer experimental cavity, and a liquid medium is stored in the submerged container for submerging the sample in the liquid medium; the laser power reduction measurement component is located below the submerged container; The experimental platform comprises a cabinet, a glass partition and a lower partition are fixedly arranged in the cabinet, 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 cavity, a middle experimental cavity and an upper monitoring cavity from bottom to top; 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 power reduction degree of the laser passing through the liquid medium.

[0005] Furthermore, the laser generating system also includes a fiber laser, an optical path adjustment device and a water cooler; The fiber laser is installed in the lower control cavity, the fiber laser is connected to the optical path adjustment device through an optical fiber, the optical path adjustment device is installed in the upper monitoring cavity, and the output end of the optical path adjustment device is connected to the laser head; the fiber laser is connected to the water cooler; an opening for the laser head to pass through is provided on the glass partition.

[0006] Furthermore, the optical path adjustment device includes a housing, an input optical fiber, a water inlet and a water outlet; The shell is fixed in the lower control cavity, and a liquid flow channel is arranged in the shell, and the liquid flow channel connects the water inlet and the water outlet for cooling circulation; a lens group is arranged in the shell, the top of the shell is connected to the input optical fiber, and the bottom of the shell is connected to the laser head.

[0007] Furthermore, a cooling water tank and a submerged liquid water tank are arranged in the water-cooling machine, one side of the cooling water tank is connected to a heating closed-loop water circuit, the heating closed-loop water circuit is sleeved on the submerged liquid water tank, and the other side of the cooling water tank is connected to a cooling closed-loop water circuit through a connecting water pipe, and the cooling closed-loop water circuit surrounds the fiber laser.

[0008] Furthermore, it also includes a blowing system, which includes a gas tank, a gas delivery pipeline and a blowing head; the gas tank is connected to the blowing head through the gas delivery pipeline, and the blowing head is installed in the middle-layer experimental cavity. The blowing end of the blowing head faces the output end of the laser head, and the blowing direction can be adjusted through the pipeline according to experimental needs.

[0009] Furthermore, the submerged container is connected to a water pump via a water inlet and a water outlet, scale lines are provided on the submerged container, a through hole is provided at the bottom of the submerged container, and a coating sheet for laser to pass through is fixedly connected in the through hole.

[0010] 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.

[0011] Furthermore, the laser power reduction measurement assembly comprises a vertically arranged diffusion tube and a support tube, the top of the diffusion tube is detachably connected to a support glass plate, the submerged container is placed on the support glass plate, the bottom of the diffusion tube is connected to the support tube, and an expansion liquid medium is arranged in the support tube; The laser emitted by the laser head is used to irradiate the expansion liquid medium, and the power reduction degree of the laser is reflected by the volume change of the expansion liquid medium.

[0012] Furthermore, a diffusion glass stage is arranged in the diffusion tube, and the diffusion glass stage is in a conical structure, the bottom of the diffusion glass stage abuts against the middle ring, and the top of the diffusion glass stage abuts against the supporting glass plate; The middle ring is located between the diffusion tube and the support tube, and a hollow portion of the middle ring is used for laser to pass through.

[0013] Furthermore, a heat-insulating piston plate is slidably disposed in the support tube, a return spring is abutted below the heat-insulating piston plate, and the expansion liquid medium is located between the diffusion glass table and the heat-insulating piston plate; The top of the heat-insulating piston plate is fixedly connected to a heat-conducting block, the top of the heat-conducting block is a conical structure, and the heat-conducting block is coaxially arranged with the diffusion glass table; A measuring component for measuring the displacement change of the heat-insulating piston plate is arranged below the heat-insulating piston plate.

[0014] The present invention has the following beneficial effects: (1) As a device for measuring laser reduction, the present invention can explore the reduction degree of laser power and its 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 medium, and adjust the laser-assisted rock breaking strategy during drilling accordingly, so as to provide effective data for laser rock breaking mining in liquid environment; (2) The present invention can simulate the laser rock breaking process in the liquid submersion environment in oil and gas drilling indoors, measure the reduction of laser power due to liquid media of different depths, types and temperatures, and adjust the laser output parameters based on feedback, so as to observe the laser rock breaking effect under different submersion conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the upper monitoring cavity; Figure 3 This is a top view of the middle-level experimental cavity; Figure 4 It is the overall schematic diagram of the submerged container; Figure 5This is a schematic diagram of the laser cooling structure; Figure 6 It is a schematic diagram of the structure of the optical path adjustment device; Figure 7 This is a schematic diagram of the laser power reduction measurement component; In the figure: 1-experimental platform, 2-lower control cavity, 3-middle experimental cavity, 4-upper monitoring cavity, 5-master control screen, 6-control system host, 7-fiber laser, 8-water chiller, 9-gas tank, 10-valve, 11-pressure dial, 12-gas delivery pipeline, 13-blowing head, 14-support tube, 15-diffusion tube, 16-diffusion glass table, 17-flooding container, 18-coating sheet, 19-laser head, 20-optical path adjustment device, 21-opening, 22-searchlight, first camera 23, second camera 29, 24-first infrared thermometer, second infrared thermometer 30, 25-exhaust hole, 26-glass partition, 27-lower partition, 28-water pump, 141-middle ring, 142-bottom plate, 143-expansion liquid medium, 144-heat conduction block, 145-insulation 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-flooding 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 meter, 89-second temperature display meter, 810-heating closed-loop water circuit, 811-water tank inlet, 812-water tank outlet, 171-scale line, 173-water inlet, 172-water outlet, 201-input optical fiber, 202-water inlet, 203-water outlet, 204-collimating mirror, 205-focusing mirror, 206-protective mirror, 207-laser beam, 208-housing. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention Figure 1-Figure 7 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0017] like Figure 1 , a laser experimental device for measuring laser power reduction in a submerged environment, comprising an experimental platform 1, a laser generating system and an experimental system; The laser generating system comprises a laser head 19; The experimental system includes a submerged container 17 and a laser power reduction measurement component; the submerged container 17 is located in the middle layer experimental cavity 3, and a liquid medium is stored in the submerged container 17 for submerging the sample in the liquid medium; the laser power reduction measurement component is located below the submerged container 17; The experimental platform 1 includes a cabinet, in which a glass partition 26 and a lower partition 27 are fixedly arranged, the glass partition 26 is located above the lower partition 27, and the glass partition 26 and the lower partition 27 divide the interior of the cabinet into a lower control cavity 2, a middle experimental cavity 3 and an upper monitoring cavity 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 in the submerged container 17. The laser power reduction measurement component is used to measure the power reduction degree of the laser passing through the liquid medium.

[0018] The laser head 19 is a prior art, which is used to emit a high-energy laser to illuminate the rock sample for laser rock breaking experiments. The inside of the submerged container 17 is used to contain 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.

[0019] The present invention is a device for measuring laser reduction. Since different liquid media have different absorption rates of high-energy lasers, the present invention designs a laser power reduction measurement component, which can explore the reduction degree of laser power and its energy under different liquid media and different liquid volumes, and then reversely adjust the power of the laser head 19 according to the reduction degree, so that the laser head 19 is at the optimal power and the rock sample is in the best experimental environment. Through the experiment of the present invention, the reduction effect of different liquid media on laser power can be explored, the optimal laser power corresponding to the liquid medium can be found, and the laser-assisted rock breaking strategy during drilling can be adjusted accordingly, which can provide effective data for laser rock breaking mining in liquid environments.

[0020] The present invention can simulate the laser rock breaking process in the liquid submerged environment in oil and gas drilling indoors, measure the reduction of laser power by liquid media of different depths, types and temperatures, and adjust the laser output parameters according to feedback, so as to observe the laser rock breaking effect under different submerged conditions, and has strong functionality. The influence of the submerged environment on the laser power and the laser rock breaking process can be studied, and the laser rock breaking theory under liquid submerged conditions can be improved.

[0021] Furthermore, the laser generating system further comprises a fiber laser 7, an optical path adjustment device 20 and a water cooler 8; The fiber laser 7 is installed in the lower control cavity 2, and 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, and 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 cooler 8; and an opening 21 is provided on the glass partition 26 for the laser head 19 to pass through.

[0022] The fiber laser 7 is a prior art and is used to provide a laser source for the laser head 19. The optical path adjustment device 20 can adopt a collimated laser in the prior art, or can adopt the following structure: like 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; The shell 208 is fixed in the lower control cavity 2, and a liquid flow channel is arranged in the shell 208, and the liquid flow channel connects the water inlet 202 and the water outlet 203 for cooling circulation; a lens group is arranged in the shell 208, the top of the shell 208 is connected to the input optical fiber 201, and the bottom of the shell 208 is connected to the laser head 19.

[0023] The lens group includes a collimator lens 204, a focusing lens 205, and a protective lens 206 which are sequentially arranged inside the housing 208 from top to bottom, and are used to collimate and focus the laser. The water inlet 202 and the water outlet 203 can be connected to a water pump, a heat sink, and other components through a pipeline, and circulate in the liquid flow channel of the housing 208 to achieve a cooling function.

[0024] like Figure 5 A cooling water tank 82 and a submerged liquid water tank 83 are arranged in the water cooler 8. One side of the cooling water tank 82 is connected to a heating closed-loop water circuit 810. The heating closed-loop water circuit 810 is sleeved on 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 through a connecting water pipe 81. The cooling closed-loop water circuit 73 surrounds the fiber laser 7.

[0025] The heating closed-loop water circuit 810 is connected to the cooling water tank 82 through 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 pipe 81 through the cooling water circuit water inlet 71 and the cooling water circuit water outlet 72, and the connecting water pipe 81 is connected to the cooling water tank 82 through the first cooling pipe interface 84 and the second cooling pipe interface 85. A water tank water inlet 811 is set at the top of the submerged liquid water tank 83, and a water tank water outlet 812 is set at the bottom.

[0026] The cooling closed-loop water circuit 73 can be inside or outside the fiber laser 7 to form a water cooling cycle. The fiber laser 7 is effectively cooled and the waste heat is recovered. The heating closed-loop water circuit 810 surrounds the submerged liquid tank 83 and can heat the submerged liquid by recovering waste heat as needed. The liquid temperature can be monitored by the first temperature display meter 88 and the second temperature display meter 89.

[0027] Furthermore, it also includes a blowing system, which includes a gas tank 9, a gas delivery pipeline 12 and a blowing head 13; the gas tank 9 is connected to the blowing head 13 through the gas delivery pipeline 12, and the blowing head 13 is installed in the middle-level experimental cavity 3, and the blowing end of the blowing head 13 faces the output end of the laser head 19, and the blowing direction can be adjusted through the gas delivery pipeline 12 according to experimental needs.

[0028] The gas tank is connected to a valve 10 and a pressure dial 11, which can adjust the gas pressure and is used to remove water vapor and impurities during the experiment. The gas can be discharged through the exhaust hole 25 to maintain the pressure balance in the experimental chamber.

[0029] Furthermore, the submerged container 17 is connected to the water pump 28 through the water inlet 173 and the water outlet 172. The submerged container 17 is provided with a scale line 171. The bottom of the submerged container 17 is provided with a through hole, and the through hole is fixedly connected with a coating sheet 18 for laser to pass through. The coating sheet 18 is made of highly transparent material and can effectively transmit the laser, which is convenient for measuring the laser power reduction rate. The water pump 28 can be connected to a water tank to achieve the replacement of the liquid medium in the submerged container 17 through the water inlet 173 and the water outlet 172.

[0030] 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.

[0031] like Figure 2 , two cameras and infrared thermometers can be provided, 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 directed toward the sample and used to capture the sample changes in real time. The first infrared thermometer 24 and the second infrared thermometer 30 are used to measure the temperature changes of the sample. The searchlight 13 can adjust the light color to assist in imaging.

[0032] like Figure 7The laser power reduction measurement assembly includes a vertically arranged diffusion tube 15 and a support tube 14. The top of the diffusion 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 diffusion tube 15 is connected to the support tube 14. An expansion liquid medium 143 is arranged in the support tube 14. The laser emitted by the laser head 19 is used to irradiate the expansion liquid medium 143 , and the reduced laser power is calculated by the volume change of the expansion liquid medium 143 , reflecting the degree of laser power reduction.

[0033] The diffusion tube 15 and the support tube 14 are hollow tube structures and are coaxially distributed. The support glass plate 151 plays a role in supporting the submerged container 17. The present invention reflects the power reduction of the laser by the volume change of the expansion liquid medium 143. When different liquid media are placed in the submerged container 17, the volume change rate of the expansion liquid medium 143 is different.

[0034] Furthermore, a diffusion glass stage 16 is disposed in the diffusion tube 15. The diffusion glass stage 16 is in a conical structure. The bottom of the diffusion glass stage 16 abuts against the middle ring 141, and the top of the diffusion glass stage 16 abuts against the supporting glass plate 151. The middle ring 141 is located between the diffusion tube 15 and the support tube 14 , and a hollow portion of the middle ring 141 is used for laser to pass through.

[0035] The intermediate ring 141 can connect the diffusion tube 15 and the support tube 14 by bolts. The top and bottom of the diffusion glass stage 16 are clamped by the support glass plate 151 and the intermediate ring 141 respectively. The bottom of the diffusion glass stage 16 can be set to a cylindrical structure, and a corresponding sealing ring is set to realize a sealing structure under the diffusion glass stage 16, so that the expansion liquid medium 143 cannot enter the diffusion tube 15.

[0036] The diffusion tube 15, the support tube 14, the diffusion glass stage 16, the intermediate ring 141, the heat conductive block 144 and the 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 sheet 18, the diffusion glass stage 16, the intermediate ring 141 in sequence and finally irradiates the expanded liquid medium 143 and the heat conductive block 144.

[0037] The function of the diffusion glass stage 16 is that when the laser beam irradiates the top vertex and emits, the laser beam is refracted and diffused, so that the laser beam forms a circular light spot with an enlarged diameter, and the circular light spot is then irradiated onto the expansion liquid medium 143 and the heat conductive block 144, so as to disperse the energy of the laser beam, so that the expansion liquid medium 143 and the heat conductive block 144 are heated more evenly, and the energy concentration of the laser beam is decomposed to prevent the laser beam from penetrating the heat conductive block 144.

[0038] Furthermore, a heat-insulating piston plate 145 is slidably disposed in the support tube 14 , a return spring 146 is abutted below the heat-insulating piston plate 145 , and the expansion liquid medium 143 is located between the diffusion glass stage 16 and the heat-insulating piston plate 145 ; The top of the heat-insulating piston plate 145 is fixedly connected to a heat-conducting block 144 , the top of the heat-conducting block 144 is a conical structure, and the heat-conducting block 144 is coaxially arranged with the diffusion glass stage 16 ; A measuring component 147 for measuring the displacement change of the heat-insulating piston plate 145 is disposed below the heat-insulating piston plate 145 .

[0039] The bottom of the support tube 14 is connected to the bottom plate 142 by bolts, and the bottom of the return spring 146 abuts against the bottom plate 142. The bottom plate 142 is fixed on the lower partition 27. The measuring component 147 is a prior art, such as a photoelectric sensor, a distance sensor, etc. The heat conducting block 144 realizes the function of absorbing and conducting heat to heat the expansion liquid medium 143.

[0040] The specific working principle of the laser power reduction measurement assembly 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, and the laser irradiation time t is set. During the time t, the laser emitted by the laser head 19 passes through the liquid medium, the coating sheet 18, the diffusion glass table 16, the intermediate ring 141 in sequence and finally irradiates the expansion liquid medium 143 and the heat-conducting block 144. The energy of the laser beam causes the temperature of the expansion liquid medium 143 and the heat-conducting block 144 to rise, and at the same time, the volume of the expansion liquid medium 143 gradually increases, so the heat-insulating piston plate 145 moves downward to compress the reset spring 146. After reaching the time t, the measuring component 147 records the displacement of the heat-insulating piston plate 145, and the displacement of the heat-insulating piston plate 145 is the volume change of the expansion liquid medium 143.

[0041] By pre-empting the submerged container 17 without storing any medium inside, the displacement of the insulating piston plate 145 under this condition is measured in an empty experimental environment, and then the position is used as a comparative reference example, and the displacement change of the insulating piston plate 145 of the same volume of different liquid media is used as an experimental example. The displacement change ratio between the experimental example and the comparative reference example can be obtained. Through this ratio, the actual laser power after the laser passes through the liquid medium can be roughly calculated, which can reflect the degree of reduction of the laser beam under different liquid media, can assist in adjusting the rock breaking strategy, and can determine which liquid medium has a lower laser reduction rate.

[0042] In addition, the support tube 14 is also provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe are connected to the corresponding pump body and the water tank. When the liquid medium in the submerged container 17 is replaced, the high-temperature expansion liquid medium 143 in the support tube 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 input through the pump body to replace the high-temperature high-temperature expansion liquid medium 143 until the insulation piston plate 145 returns to the initial position.

[0043] The present invention also includes a control system, which includes a master 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, and other parts are connected by cables to achieve adjustment and control.

[0044] The experimental process of the laser-assisted rock breaking of the present invention is as follows: S1. Place a sample in the submerged container 17, turn on the control system, fiber laser 7, water cooler 8, valve 10, set laser parameters through the master control screen 5, start the fiber laser 7, and emit a laser beam through the laser head 19.

[0045] S2 sets the water inlet volume, and the water pump 28 is used to pump water so that the liquid level in the submerged container 17 reaches a certain height and submerges the top of the rock sample. The water inlet valve is closed to keep the liquid level unchanged.

[0046] S4 After the rock is soaked for a predetermined time, the fiber laser 7 is started, the laser head 19 emits a laser beam, and the air blowing system is turned on at the same time, and the searchlight 22, the first camera 23, the second camera 29 and the first infrared thermometer 24, the second infrared thermometer 30 are turned on.

[0047] S5: After irradiating for a predetermined time, turn off the fiber laser 7 and the air blowing system, and at the same time turn off the first camera 23, the second camera 29, the first infrared thermometer 24, and the second infrared thermometer 30, and store the experimental data.

[0048] After the S5 experiment is finished, the water inlet 173 and the water outlet 174 are opened to drain the submerged liquid, and clean water is passed to clean the submerged container.

[0049] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A laser experimental device for measuring laser power reduction in a submerged environment, characterized in that: It includes an experimental platform (1), a laser generating system and an experimental system; The laser generating system comprises a laser head (19); The experimental system comprises a submerged container (17) and a laser power reduction measurement component; the submerged container (17) is located in the middle-layer experimental cavity (3); a liquid medium is stored in the submerged container (17) for submerging a sample in the liquid medium; and the laser power reduction measurement component is located below the submerged container (17); The experimental platform (1) comprises a cabinet, wherein a glass partition (26) and a lower partition (27) are fixedly arranged in the cabinet, wherein the glass partition (26) is located above the lower partition (27), and the glass partition (26) and the lower partition (27) divide the interior of the cabinet into a lower control cavity (2), a middle experimental cavity (3) and an upper monitoring cavity (4) from bottom to top. The laser light emitted by the laser head (19) passes through the glass partition (26) from top to bottom and irradiates the sample in the submerged container (17). The laser power reduction measurement component is used to measure the power reduction degree of the laser light passing through the liquid medium.

2. A laser experimental device for measuring laser power reduction in a submerged environment according to claim 1, characterized in that: The laser generating system further comprises a fiber laser (7), an optical path adjustment device (20) and a water cooler (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) via an optical fiber, the optical path adjustment device (20) is installed in the upper monitoring cavity (4), and 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 cooler (8); and the glass partition (26) is provided with an opening (21) for the laser head (19) to pass through.

3. A laser experimental device for measuring laser power reduction in a submerged environment according to claim 2, characterized in that: The optical path adjustment device (20) comprises a housing (208), an input optical fiber (201), a water inlet (202) and a water outlet (203); The shell (208) is fixed in the lower control cavity (2), and a liquid flow channel is provided in the shell (208), the liquid flow channel is connected to the water inlet (202) and the water outlet (203) for cooling circulation; a lens group is provided in the shell (208), the top of the shell (208) is connected to the input optical fiber (201), and the bottom of the shell (208) is connected to the laser head (19).

4. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 2, characterized in that: A cooling water tank (82) and a submerged liquid water tank (83) are arranged in the water chiller (8); one side of the cooling water tank (82) is connected to a heating closed-loop water circuit (810); the heating closed-loop water circuit (810) is sleeved on 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); the cooling closed-loop water circuit (73) surrounds the optical fiber laser (7).

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

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

7. The laser experimental device for measuring laser power reduction in a submerged 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 device for measuring laser power reduction in a submerged environment according to claim 1, characterized in that: The laser power reduction measurement assembly comprises a vertically arranged diffusion tube (15) and a support tube (14); the top of the diffusion 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 diffusion tube (15) is connected to the support tube (14); and an expansion liquid medium (143) is provided in the support tube (14); The laser emitted by the laser head (19) is used to irradiate the expansion liquid medium (143), and the power reduction degree of the laser is reflected by the volume change of the expansion liquid medium (143).

9. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 8, characterized in that: A diffusion glass platform (16) is arranged in the diffusion tube (15); the diffusion glass platform (16) is in a conical structure; the bottom of the diffusion glass platform (16) abuts against the middle ring (141); and the top of the diffusion glass platform (16) abuts against the supporting glass plate (151); The intermediate ring (141) is located between the diffusion tube (15) and the support tube (14), and a hollow portion of the intermediate ring (141) is used for laser to pass through.

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

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