A laser experimental device for measuring laser power reduction in submerged environments

Abstract

The present invention belongs to the technical field of laser measurement equipment and provides 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 experimental system comprises a submerged container and a laser power reduction measuring component; a liquid medium is stored in the submerged container, and a sample is submerged in the liquid medium; the laser power reduction measuring component is located below the submerged container; the laser emitted by the laser head irradiates the sample in the submerged container, and the laser power reduction measuring component is used to measure the power reduction of the laser passing through the liquid medium; as a device for measuring laser reduction, the present invention can explore the degree of reduction of laser power and energy under different liquid media, explore the influence of different liquid media on laser power reduction, find the optimal laser power for the corresponding liquid medium, and adjust the laser-assisted rock breaking strategy during drilling accordingly, thereby providing effective data 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 submerged environments, due to the refraction, absorption and scattering characteristics of water, the laser power will be significantly reduced. Therefore, traditional laser experimental devices often have difficulty in accurately measuring the reduction of laser power in submerged environments. This limits the application of laser technology in certain specific fields, such as laser rock breaking.

[0003] Laser-assisted drilling technology, as an emerging drilling method, holds promising application prospects in oil and gas production. However, during oil and gas drilling, liquid media (such as water and drilling fluid) are often present in the wellbore, significantly impacting laser propagation and power transfer. When the laser penetrates the liquid medium, power reduction occurs due to refraction, scattering, and absorption by the liquid, significantly reducing the laser power reaching the rock surface. In practical applications, laser power reduction is often difficult to accurately measure and adjust in real time, thus impacting drilling efficiency and operational safety. Currently, no experimental device for laser rock breaking in a submerged environment exists that can study liquid reduction. Therefore, the present invention provides a device capable of measuring laser reduction, experimentally studying the degree of laser reduction after passing through liquid, and providing an effective theoretical basis for laser rock breaking. Summary of the Invention

[0004] 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:

[0005] 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;

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

[0007] The experimental system includes a submerged container and a laser power reduction measurement component; the submerged container is located in the middle 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;

[0008] The experimental platform includes a cabinet, in which a glass partition and a lower partition are fixedly arranged, 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;

[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 power reduction degree 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 cooler;

[0011] 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.

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

[0013] The shell is fixed in the lower control cavity, and a liquid flow channel is provided in the shell, and the liquid flow channel connects the water inlet and the water outlet for cooling circulation; a lens group is provided 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.

[0014] Furthermore, a cooling water tank and a submerged liquid water tank are provided 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. The other side of the cooling water tank is connected to a cooling closed-loop water circuit through a connecting water pipe. The cooling closed-loop water circuit surrounds the fiber laser.

[0015] 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.

[0016] Furthermore, the submerged container is connected to a water pump through a water inlet and a water outlet, scale lines are provided on the submerged container, and a through hole is provided at the bottom of the submerged container, and a coating sheet for laser passing through is fixedly connected in 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 assembly includes 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 provided in the support tube;

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

[0020] Furthermore, a diffusion glass platform is provided in the diffusion tube, and the diffusion glass platform is in a conical structure, the bottom of the diffusion glass platform abuts against the middle ring, and the top of the diffusion glass platform abuts against the supporting glass plate;

[0021] 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.

[0022] Furthermore, a heat-insulating piston plate is slidably provided in the support tube, a return spring is abutted against the bottom of the heat-insulating piston plate, and the expansion liquid medium is located between the diffusion glass table and the heat-insulating piston plate;

[0023] 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;

[0024] A measuring component for measuring displacement changes of the heat-insulating piston plate 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, the present invention can explore the reduction degree of laser power and its energy in different liquid media, explore the influence of different liquid media on laser power reduction, find the optimal laser power for the corresponding liquid medium, and adjust the laser-assisted rock breaking strategy during drilling accordingly, thus providing effective data for laser rock breaking mining in liquid environments;

[0027] (2) The present invention can simulate the laser rock breaking process in the liquid submersion environment of 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 the feedback, so as to observe the laser rock breaking effect under different submersion conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 3 This is a top view of the middle-level experimental cavity;

[0031] Figure 4 It is the overall schematic diagram of the submerged container;

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

[0033] Figure 6 Schematic diagram of the structure of the optical path adjustment device;

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

[0035] 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-air pressure dial, 12-gas delivery pipeline, 13-blowing head, 14-support tube, 15-diffusion tube, 16-diffusion glass table, 17-submerged 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-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-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

[0036] The following is a combination of 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.

[0037] 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;

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

[0039] The experimental system includes a submerged container 17 and a laser power reduction measurement component; the submerged container 17 is located in the middle 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;

[0040] 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. 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.

[0041] 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.

[0042] The laser head 19 is an existing technology, which is used to emit high-energy laser to irradiate rock samples for laser rock breaking experiments. The submersion container 17 is used to contain different liquid media, which submerge the rock samples, so that the laser emitted by the laser head 19 can perform laser rock breaking experiments on the samples submerged in the liquid environment.

[0043] 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 degree of reduction 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 to make the laser head 19 at the optimal power and the rock sample in the best experimental environment. Through the experiment of the present invention, the influence of different liquid media on the reduction of 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 a liquid environment.

[0044] This invention can simulate the laser rock breaking process in liquid-submerged oil and gas drilling environments indoors. It measures the reduction in laser power due to liquid media at different depths, types, and temperatures, and adjusts laser output parameters based on the feedback. This allows for observation of the laser rock breaking effect under various submerged conditions, demonstrating its high functionality. This allows for research into the impact of submerged environments on laser power and the laser rock breaking process, ultimately improving the theory of laser rock breaking under liquid-submerged conditions.

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

[0046] 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 for the laser head 19 to pass through is provided on the glass partition 26.

[0047] The fiber laser 7 is a prior art laser source for the laser head 19. The optical path adjustment device 20 can be a collimated laser in the prior art, or can be a structure as follows:

[0048] 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;

[0049] The shell 208 is fixed in the lower control cavity 2, and a liquid flow channel is provided 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 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.

[0050] The lens assembly includes, from top to bottom, a collimating lens 204, a focusing lens 205, and a protective lens 206, positioned within a housing 208. These lenses are used to collimate and focus the laser. The water inlet 202 and outlet 203 can be connected to components such as a water pump and a heat sink via pipes, allowing the water to circulate within the liquid flow path of the housing 208, achieving cooling.

[0051] like Figure 5 A cooling water tank 82 and a submerged liquid water tank 83 are provided 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.

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

[0053] The cooling closed-loop water circuit 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 circuit 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 using the first temperature display 88 and the 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-layer experimental cavity 3. The blowing end of the blowing head 13 is 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 tank is connected to a valve 10 and a pressure dial 11, which can adjust the air 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 air pressure balance in the experimental chamber.

[0056] Furthermore, the submerged container 17 is connected to a water pump 28 via a water inlet 173 and a water outlet 172. The submerged container 17 is provided with scale lines 171 and a through-hole at its bottom, into which a coating sheet 18 is fixedly connected, through which the laser passes. The coating sheet 18 is made of a highly transparent material that effectively transmits the laser light, facilitating the measurement of the laser power reduction rate. The water pump 28 can be connected to a water tank, and the liquid medium in the submerged container 17 can be replaced through the water inlet 173 and the water outlet 172.

[0057] Furthermore, it also includes a monitoring system, which includes a camera, an infrared thermometer and a searchlight 22. The camera and the infrared thermometer are installed in the upper monitoring cavity 4, and the searchlight 22 is installed in the middle experimental cavity 3.

[0058] like Figure 2Two cameras and two infrared thermometers can be provided: a first camera 23, a second camera 29, and a first infrared thermometer 24, 30. The first and second cameras 23, 29 face the sample and capture real-time changes in the sample. The first and second infrared thermometers 24, 30 measure changes in the sample's temperature. The searchlight 22 has adjustable light color to aid imaging.

[0059] like Figure 7 The 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. The support tube 14 is provided with an expansion liquid medium 143.

[0060] 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.

[0061] The diffuser 15 and support tube 14 are hollow tubes coaxially arranged. The supporting glass plate 151 supports the submerged container 17. The present invention reflects laser power reduction by adjusting the volume 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 varies accordingly.

[0062] Furthermore, a diffusion glass platform 16 is provided in the diffusion tube 15. The diffusion glass platform 16 has 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.

[0063] 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 light to pass through.

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

[0065] The diffusion tube 15, support tube 14, diffusion glass stage 16, intermediate ring 141, heat conducting block 144 and laser head 19 are coaxially arranged. When only liquid medium is placed in the submerged container 17 without a sample, the laser emitted by the laser head 19 passes through the liquid medium, coating sheet 18, diffusion glass stage 16, intermediate ring 141 in sequence and finally irradiates the expanding liquid medium 143 and heat conducting block 144.

[0066] The function of the diffusion glass table 16 is that when the laser beam hits its top vertex and exits, the laser beam is refracted and diffused, thereby forming a circular spot with an enlarged diameter. The circular spot then irradiates the expansion liquid medium 143 and the heat conductive block 144, thereby dispersing the energy of the laser beam, making the expansion liquid medium 143 and the heat conductive block 144 more evenly heated. The energy concentration of the laser beam is also decomposed to prevent the laser beam from penetrating the heat conductive block 144.

[0067] Furthermore, a heat-insulating piston plate 145 is slidably provided in the support tube 14 , a return spring 146 is abutted against the bottom of 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 ;

[0068] 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. The heat-conducting block 144 is coaxially arranged with the diffusion glass stage 16 .

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

[0070] The bottom of support tube 14 is bolted to base plate 142, with the bottom of return spring 146 abutting against it. Base plate 142 is fixed to lower partition 27. Measuring component 147 utilizes conventional technology, such as a photoelectric sensor or distance sensor. Heat conducting block 144 absorbs and conducts heat to heat and expand liquid medium 143.

[0071] The specific operating principle of the laser power reduction measurement assembly is as follows: when measuring the laser reduction rate of a liquid medium in submerged container 17, the liquid medium is placed in submerged container 17 without a sample, and the laser irradiation time t is set. During this time t, the laser light emitted by laser head 19 sequentially passes through the liquid medium, coating sheet 18, diffusion glass table 16, intermediate ring 141, and ultimately irradiates the expanding liquid medium 143 and heat conductive block 144. The energy of the laser beam causes the temperature of expanding liquid medium 143 and heat conductive block 144 to rise, while the volume of expanding liquid medium 143 gradually increases. This causes thermal insulation piston plate 145 to move downward, compressing return spring 146. After time t is reached, measurement component 147 records the displacement of thermal insulation piston plate 145, which is the volume change of expanding liquid medium 143.

[0072] 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. Then, this position is used as a comparative reference example, and the displacement change of the insulating piston plate 145 with 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, and can assist in adjusting the rock breaking strategy, and can determine which liquid medium has a lower laser reduction rate.

[0073] In addition, the support tube 14 is also provided with a water inlet pipe and a water outlet pipe, which 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 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 its initial position.

[0074] 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.

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

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

[0077] 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.

[0078] 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, the first infrared thermometer 24, and the second infrared thermometer 30 are turned on.

[0079] S5: After irradiation for a predetermined time, 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 turned off at the same time, and the experimental data are stored.

[0080] 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 through to clean the submerged container.

[0081] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the 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 fall within the scope of protection 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 includes a laser head (19); 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 experimental system comprises a submerged container (17) and a laser power reduction measurement component; the submerged container (17) is located in the middle experimental cavity (3), and a liquid medium is stored in the submerged container (17) for submerging a sample in the liquid medium; the laser power reduction measurement component is located below the submerged container (17); 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), and the laser power reduction measurement component is used to measure the power reduction degree of the laser light passing through the liquid medium; The laser generating system further includes 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); the glass partition (26) is provided with an opening (21) for the laser head (19) to pass through; The optical path adjustment device (20) comprises a housing (208), an input optical fiber (201), a first water inlet (202), and a first water outlet (203); The housing (208) is fixed in the lower control cavity (2), and a liquid flow channel is provided in the housing (208), the liquid flow channel being connected to the first water inlet (202) and the first water outlet (203) for cooling circulation; a lens group is provided in the housing (208), the top of the housing (208) is connected to the input optical fiber (201), and the bottom of the housing (208) is connected to the laser head (19); The apparatus further comprises an air blowing system, the air blowing system comprising a gas tank (9), a gas delivery pipe (12) and an air blowing head (13); the gas tank (9) is connected to the air blowing head (13) through the gas delivery pipe (12); the air blowing head (13) is installed in the middle-layer experimental cavity (3), and the air blowing end of the air blowing head (13) faces the output end of the laser head (19); 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).

2. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 1, characterized in that: A cooling water tank (82) and a submerged liquid water tank (83) are provided in the water-cooling machine (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 fiber laser (7).

3. 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 the water pump (28) via a second water inlet (173) and a second water outlet (172). A scale mark (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 light to pass through is fixedly connected in the through hole.

4. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 1, characterized in that: The device also includes a monitoring system, which includes a camera, an infrared thermometer and a searchlight (22). The camera and the infrared thermometer are installed in the upper monitoring cavity (4), and the searchlight (22) is installed in the middle experimental cavity (3).

5. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 1, characterized in that: A diffusion glass platform (16) is provided 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 light to pass through.

6. The laser experimental device for measuring laser power reduction in a submerged environment according to claim 5, characterized in that: A heat-insulating piston plate (145) is slidably provided 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 table (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 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).

Images