Liquid sample table for Brillouin scattering experiment

Abstract

The invention relates to the technical field of optical measurement and fluid experiment equipment, in particular to a liquid sample table for a Brillouin scattering experiment. The liquid sample table for the Brillouin scattering experiment comprises an outer shell, a driving interface, a mounting frame, an inner sleeve, a driving assembly, a suction cup and a rotating assembly, the center of the outer shell is provided with a cylindrical cavity used for containing a rotary flowing liquid sample, and the two sides of the outer shell are provided with rectangular optical windows used for Brillouin scattering light path incidence and signal collection; and constant-temperature liquid is filled between the outer shell and the cylindrical cavity. According to the liquid sample table for the Brillouin scattering experiment, rotation of the inner sleeve and the outer sleeve is achieved through the actual driving assembly, so that axial-circumferential composite flowing and steady-dynamic superposition shearing of a liquid sample are achieved, and the situation of actual fluid in a complex flowing state is simulated more truly; and experimental conditions closer to reality are provided for a Brillouin scattering experiment.

Description

Technical Field

[0001] The present invention relates to the technical field of optical measurement and fluid experimental equipment, and in particular to a liquid sample table for Brillouin scattering experiments. Background Art

[0002] Brillouin scattering, as a high-resolution, non-contact optical technique, has demonstrated unique advantages in the field of materials science, particularly in measuring the acoustic properties of liquids. Through Brillouin scattering experiments, researchers can determine key physical parameters of liquids, such as elastic modulus, acoustic velocity, and viscosity, enabling a deeper understanding of the complex relationship between microstructural rearrangements and viscoelastic behavior during liquid flow. However, existing Brillouin scattering experimental sample stages have significant limitations in design and functionality.

[0003] Most existing Brillouin scattering experimental sample stages adopt a static structural design, that is, the sample stage itself does not have the function of rotating flow control. This design makes it difficult to control the rotational flow of liquid samples during Brillouin scattering experiments, thereby limiting the experimental conditions and failing to fully simulate the physical behavior of real fluids under complex flow states. In particular, when studying the microstructural rearrangement and viscoelastic behavior of liquids in low shear rate rotating flows, the static sample stage cannot meet the experimental requirements, resulting in the accuracy and reliability of the experimental results being affected. Secondly, in Brillouin scattering experiments, the stability of the sample stage is crucial to the accuracy of the experimental results. However, existing sample stages often lack sufficient stability considerations in their design. The internal components of the sample stage may shake or deviate during rotation, resulting in the laser beam being unable to accurately impinge on the sample liquid, or the scattering signal being unable to be effectively collected, thereby affecting the accuracy of the experimental results.

[0004] Therefore, it is necessary to provide a new liquid sample stage for Brillouin scattering experiments to solve the above technical problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a liquid sample stage for Brillouin scattering experiments, which can perform high-precision optical measurements of liquid samples under rotating shear flow conditions. It is compatible with two Brillouin optical path modes: 180° backscattering and 90° right-angle scattering. It is suitable for studying the acoustic properties (such as elastic modulus, sound velocity, viscosity, etc.) of Newtonian fluids and non-Newtonian fluids (such as polymer solutions, biological fluids, etc.), providing experimental support for microfluidics technology, soft matter materials science and industrial fluid process optimization.

[0006] The liquid sample table for Brillouin scattering experiments provided by the present invention includes: an outer shell, a driving interface, a mounting frame, an inner sleeve, a driving assembly, a suction cup and a rotating assembly. The center of the outer shell is provided with a cylindrical cavity for accommodating a rotating flowing liquid sample and rectangular optical windows for Brillouin scattering light path incidence and signal collection arranged on both sides, and a constant temperature liquid is filled between the outer shell and the cylindrical cavity to improve thermal stability. The top of the outer shell is provided with a driving interface for realizing steady-state rotational shear flow of the liquid in the cylindrical cavity. The top of the outer shell is equipped with a mounting frame for supporting the driving system, the interior of the cylindrical cavity is provided with an inner sleeve for shearing the liquid, the outside of the inner sleeve is provided with an outer sleeve, a driving assembly is installed between the mounting frame and the inner sleeve, the driving assembly drives the inner sleeve and the outer sleeve to rotate to drive the liquid flow, forming a basic shear flow field, suction cups are provided at the bottom diagonals of the outer shell, and a rotating assembly is installed between the outer shell and the suction cups, and the rotating assembly drives the suction cups to diffuse outward to stably support the outer shell.

[0007] Preferably, the driving assembly includes: a main motor, a driving gear 1, a driven gear 1 and a connecting rod. The main motor is fixedly connected to the top of the mounting frame, the output end of the main motor passes through the bottom end of the mounting frame and is fixedly connected to the driving gear 1, the side wall of the driving gear 1 is meshed and connected to the driven gear 1, and the axis of the driven gear 1 is fixedly connected to the connecting rod. The top end of the connecting rod is rotatably connected to the mounting frame, and the bottom end thereof is fixedly connected to the top end of the inner sleeve.

[0008] Preferably, a servo motor is fixedly connected to the top of the mounting bracket, and the output end of the servo motor is fixedly connected to the driving tooth 2 through the bottom end of the mounting bracket, and the driving tooth 2 is meshed with the driven tooth 2 on the side close to the driving tooth 1, and the axis of the driven tooth 2 is fixedly connected to the top of the outer sleeve, and the top of the outer sleeve is rotatably connected to the connecting rod.

[0009] Preferably, a cylindrical container for holding a liquid sample is placed inside the cylindrical cavity, and the inner sleeve and the outer sleeve are both placed at the inner axis of the cylindrical container.

[0010] Preferably, the outer walls of the inner sleeve and the outer sleeve are both provided with spiral grooves.

[0011] Preferably, the outer shell is made of transparent acrylic material, and a constant temperature liquid is filled between the outer shell and the cylindrical cavity to improve thermal stability.

[0012] Preferably, the rotating assembly includes: a gear and a rack, a mounting groove is opened near the bottom end of the inner part of the outer shell, a gear is rotatably connected to the center of the mounting groove, and the side walls of the mounting groove are symmetrically slidably connected to the rack, the racks are meshed with the gears, and the ends of the racks are fixedly connected to the corresponding suction cups.

[0013] Preferably, a rotating rod is fixedly connected to the axis of the gear, and the bottom end of the rotating rod extends out of the outer wall of the outer shell.

[0014] Compared with related technologies, the liquid sample stage for Brillouin scattering experiments provided by the present invention has the following beneficial effects:

[0015] The drive assembly actually realizes the rotation of the inner and outer sleeves, thereby driving the liquid sample to form a rotating flow in the cylindrical cavity. The forward rotation of the inner sleeve and the periodic reverse rotation of the outer sleeve cooperate with each other to realize axial-circumferential composite flow and steady-state-dynamic superposition shear in the liquid sample, more realistically simulating the complex flow conditions of actual fluids and providing more realistic experimental conditions for Brillouin scattering experiments.

[0016] At the same time, the sample stage can precisely control the rotation speed and rotation mode of the inner and outer sleeves, thereby adjusting the shear force intensity and variation pattern of the liquid sample, meeting the needs of low shear rate rotational flow research and improving the accuracy and reliability of experimental results.

[0017] The design of the rotating assembly ensures that the sample stage remains stable during subsequent experiments, avoiding problems such as the laser beam not being able to accurately incident on the sample liquid or the scattered signal not being effectively collected due to shaking or deviation, thus ensuring the accuracy of the experimental results.

[0018] The space between the outer shell and the cylindrical cavity is filled with a constant temperature liquid. This design can effectively improve thermal stability. In Brillouin scattering experiments, temperature changes may affect the physical parameters of the liquid sample, thereby affecting the accuracy of the experimental results. Filling with constant temperature liquid can reduce the impact of temperature fluctuations on the liquid sample, allowing the experiment to be carried out in a relatively stable temperature environment, thereby improving the reliability of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a liquid sample stage for Brillouin scattering experiments provided by the present invention;

[0020] Figure 2 for Figure 1 The schematic diagram of the structure of the drive interface shown;

[0021] Figure 3 for Figure 1 A schematic structural diagram of the mounting frame shown;

[0022] Figure 4 for Figure 1 The structural diagram of the outer shell is shown.

[0023] Numbers in the figure: 1. Outer shell; 2. Cylindrical cavity; 3. Rectangular optical window; 4. Drive interface; 5. Mounting bracket; 6. Inner sleeve; 7. Outer sleeve; 8. Suction cup; 9. Main motor; 10. Driving gear 1; 11. Driven gear 1; 12. Connecting rod; 13. Servo motor; 14. Driving gear 2; 15. Driven gear 2; 16. Cylindrical container; 17. Gear; 18. Rack; 19. Rotating rod. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] See also Figures 1 to 4A liquid sample stage for Brillouin scattering experiments, the liquid sample stage for Brillouin scattering experiments comprising: an outer shell 1, a drive interface 4, a mounting frame 5, an inner sleeve 6, a drive assembly, a suction cup 8 and a rotating assembly, a cylindrical cavity 2 for accommodating a rotating flowing liquid sample and rectangular optical windows 3 for Brillouin scattering light path incidence and signal collection arranged on both sides of the outer shell 1, and a constant temperature liquid is filled between the outer shell 1 and the cylindrical cavity 2 to improve thermal stability, and a device for realizing steady-state rotational shear of the liquid in the cylindrical cavity 2 is provided on the top of the outer shell 1. The driving interface 4 of the flow, the top of the outer shell 1 is equipped with a mounting frame 5 for supporting the driving system, the interior of the cylindrical cavity 2 is provided with an inner sleeve 6 for shearing the liquid, the outer sleeve 6 is provided with an outer sleeve 7, a driving component is installed between the mounting frame 5 and the inner sleeve 6, the driving component drives the inner sleeve 6 and the outer sleeve 7 to rotate to drive the liquid flow, forming a basic shear flow field, suction cups 8 are provided at the bottom diagonal positions of the outer shell 1, a rotating component is installed between the outer shell 1 and the suction cup 8, the rotating component drives the suction cup 8 to diffuse outward for stable support of the outer shell 1, the driving component includes : Main motor 9, driving gear 10, driven gear 11 and connecting rod 12, the top of the mounting frame 5 is fixedly connected to the main motor 9, the output end of the main motor 9 passes through the bottom end of the mounting frame 5 and is fixedly connected to the driving gear 10, the side wall of the driving gear 10 is engaged with the driven gear 11, and the axis of the driven gear 11 is fixedly connected to the connecting rod 12, the top of the connecting rod 12 is rotatably connected to the mounting frame 5, and the bottom end thereof is fixedly connected to the top of the inner sleeve 6, the top of the mounting frame 5 is fixedly connected to the servo motor 13, and the output end of the servo motor 13 passes through the bottom end of the mounting frame 5 and is fixedly connected There is a driving tooth 2 14, and the driving tooth 2 14 is meshed with a driven tooth 2 15 on the side close to the driving tooth 1 10. The axis of the driven tooth 2 15 is fixedly connected to the top of the outer sleeve 7, and the top of the outer sleeve 7 is rotatably connected to the connecting rod 12. A cylindrical container 16 for holding a liquid sample is placed inside the cylindrical cavity 2. The inner sleeve 6 and the outer sleeve 7 are both placed at the internal axis of the cylindrical container 16. The outer walls of the inner sleeve 6 and the outer sleeve 7 are both provided with spiral grooves. The outer shell 1 is made of transparent acrylic material, and a constant temperature liquid is filled between the outer shell 1 and the cylindrical cavity 2 to improve thermal stability.

[0027] It should be noted that: when the main motor 9 is started and rotated forward, the main motor 9 is fixed to the top of the mounting frame 5, and its output end passes through the bottom end of the mounting frame 5 and is fixedly connected to a driving gear 10; when the main motor 9 is started, the driving gear 10 rotates accordingly, and drives the driven gear 11 meshing with it to rotate; the driven gear 11 is fixed to the connecting rod 12 at the bottom of the mounting frame 5, so the connecting rod 12 will also rotate accordingly; the bottom of the connecting rod 12 is fixedly connected to the inner sleeve 6, so the inner sleeve 6 will rotate with the connecting rod 12; the outer sleeve 7 is sleeved on the outside of the inner sleeve 6, and the top end is rotatably connected to the connecting rod 12, so that an annular flow channel is formed between the inner sleeve 6 and the outer sleeve 7; a spiral groove is provided on the outer wall of the inner sleeve 6. When the inner sleeve 6 rotates, the spiral groove will drive the liquid sample in the annular flow channel to rotate, thereby forming a shear force;

[0028] The servo motor 13 starts to reverse according to a preset program; the servo motor 13 is fixed to the top of the mounting frame 5, and its output end is fixedly connected to the driving tooth 2 14 through the bottom of the mounting frame 5; the driving tooth 2 14 is engaged with the driven tooth 2 15 fixedly connected to the top of the outer sleeve 7, so when the servo motor 13 is started, it will drive the outer sleeve 7 to rotate, and the rotation direction is opposite to the rotation direction of the inner sleeve 6; the outer wall of the outer sleeve 7 is also provided with a spiral groove; when the outer sleeve 7 rotates, the spiral groove on its outer wall will act on the liquid sample between the cylindrical container 16 and the outer sleeve 7; due to the relative motion between the outer sleeve 7 and the inner sleeve 6, and the spiral groove design on the outer walls of the two, the liquid is not only subjected to circumferential shear force during the flow process, but also to axial flow induced force; this spiral groove induced axial flow and circumferential shear are superimposed on each other to generate a more complex shear force; by precisely controlling the speed and periodic rotation mode of the servo motor 13, the intensity and change law of this complex shear force can be further adjusted, thereby simulating the physical environment under different flow conditions.

[0029] See also Figure 1 and Figure 4 The rotating assembly includes: a gear 17 and a rack 18. A mounting groove is opened near the bottom of the outer shell 1. The central position of the mounting groove is rotatably connected to the gear 17. The side walls of the mounting groove are symmetrically slidably connected to the racks 18. The racks 18 are all meshed with the gear 17. The ends of the racks 18 are fixedly connected to the corresponding suction cups 8. A rotating rod 19 is fixedly connected to the axis of the gear 17. The bottom end of the rotating rod 19 extends out of the outer wall of the outer shell 1;

[0030] It should be noted that: the operator tilts the outer shell 1 and rotates the rotating rod 19 at the bottom of the outer shell 1; the rotating rod 19 is fixedly connected to the gear 17, and when the rotating rod 19 rotates, it will drive the gear 17 in the mounting groove to rotate synchronously; the side walls of the mounting groove are symmetrically slidably connected with the rack 18, and the racks 18 are all meshed with the gear 17; as the gear 17 rotates, the rack 18 will spread outward along the inner wall of the mounting groove due to the meshing action of the gear 17; then, the entire outer shell 1 is pressed downward, so that the suction cup 8 fixedly connected to the end of the rack 18 is firmly adsorbed on the workbench, thereby completing the initial fixation of the sample stage, ensuring that the sample stage remains stable during subsequent experiments, and avoiding the impact of shaking or offset on the experimental results.

[0031] The working principle of the liquid sample stage for Brillouin scattering experiments provided by the present invention is as follows:

[0032] 1. Fixing the sample stage

[0033] First, the operator tilts the outer shell 1 and rotates the rotating rod 19 at the bottom of the outer shell 1; the rotating rod 19 is fixedly connected to the gear 17. When the rotating rod 19 rotates, it drives the gear 17 in the installation groove to rotate synchronously; the side walls of the installation groove are symmetrically slidably connected to the racks 18, and the racks 18 are meshed with the gears 17; as the gears 17 rotate, the racks 18 will spread outward along the inner wall of the installation groove due to the meshing action of the gears 17;

[0034] Next, press the entire outer shell 1 downward so that the suction cup 8 fixed to the end of the rack 18 is firmly adsorbed on the workbench, thereby completing the initial fixation of the sample stage and ensuring that the sample stage remains stable during subsequent experiments to avoid shaking or deviation that affects the experimental results.

[0035] 2. Placement of liquid samples

[0036] After the sample stage is fixed, the cylindrical container 16 containing the liquid sample is placed inside the cylindrical cavity 2; the space between the outer shell 1 and the cylindrical cavity 2 is filled with a constant temperature liquid to improve thermal stability and reduce the impact of temperature changes on the experimental results;

[0037] 3. Installation and connection of drive system

[0038] Insert the mounting bracket 5 with the drive system installed into the drive interface 4 on the top of the outer shell 1; the mounting bracket 5 not only supports the drive system, but also connects to the outer shell 1 through the drive interface 4, ensuring that the drive assembly can accurately drive the inner sleeve 6 and the outer sleeve 7 to rotate. At this time, the outer sleeve 7 and the inner sleeve 6 are both placed at the axis inside the cylindrical container 16, preparing for the subsequent drive liquid flow to generate shear force;

[0039] 4. The driving component drives the liquid to flow and form shear force

[0040] Start the main motor 9 to rotate forward. The main motor 9 is fixed to the top of the mounting frame 5. Its output end passes through the bottom end of the mounting frame 5 and is fixedly connected to the driving gear 10. When the main motor 9 is started, the driving gear 10 rotates accordingly, and drives the driven gear 11 engaged with it to rotate. The driven gear 11 is fixed to the connecting rod 12 at the bottom of the mounting frame 5, so the connecting rod 12 also rotates accordingly. The bottom of the connecting rod 12 is fixedly connected to the inner sleeve 6, so the inner sleeve 6 rotates with the connecting rod 12.

[0041] The outer sleeve 7 is sleeved on the outside of the inner sleeve 6, and the top end is rotatably connected to the connecting rod 12, so that an annular flow channel is formed between the inner sleeve 6 and the outer sleeve 7; the outer wall of the inner sleeve 6 is provided with a spiral groove. When the inner sleeve 6 rotates, the spiral groove drives the liquid sample in the annular flow channel to rotate, thereby generating a shear force;

[0042] At the same time, the servo motor 13 starts to reverse according to a preset program; the servo motor 13 is fixed to the top of the mounting frame 5, and its output end passes through the bottom end of the mounting frame 5 and is fixedly connected to the active tooth 2 14; the active tooth 2 14 is engaged with the driven tooth 2 15 fixedly connected to the top of the outer sleeve 7, so when the servo motor 13 is started, it will drive the outer sleeve 7 to rotate, and the rotation direction is opposite to the rotation direction of the inner sleeve 6; the outer wall of the outer sleeve 7 is also provided with a spiral groove; when the outer sleeve 7 rotates, the spiral groove on its outer wall will act on the liquid sample between the cylindrical container 16 and the outer sleeve 7; due to the relative motion between the outer sleeve 7 and the inner sleeve 6, and the spiral groove design on the outer walls of the two, the liquid is not only subjected to circumferential shear force during the flow process, but also to axial flow induced force; the axial flow induced by this spiral chute and the circumferential shear are superimposed on each other to generate a more complex shear force; by precisely controlling the speed and periodic rotation mode of the servo motor 13, the intensity and change law of this complex shear force can be further adjusted, thereby simulating the physical environment under different flow conditions;

[0043] This composite flow and superimposed shear can more realistically simulate the conditions of actual fluids under complex flow states, providing experimental conditions closer to reality for Brillouin scattering experiments; through the high-frequency Brillouin spectroscopy acquisition system, the transient optical response of the liquid microstructure rearrangement can be captured, thereby more accurately obtaining the liquid's elastic modulus, sound speed, viscosity and other key physical parameters, and deeply understanding the complex relationship between the microstructure rearrangement and viscoelastic behavior of the liquid under flow state, providing strong support for research in the field of materials science.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid sample stage for Brillouin scattering experiments, characterized in that: include: An outer shell (1) is provided at the center of the outer shell (1) with a cylindrical cavity (2) for accommodating a rotating flowing liquid sample and rectangular optical windows (3) for Brillouin scattering light path incidence and signal collection provided on both sides, and a constant temperature liquid is filled between the outer shell (1) and the cylindrical cavity (2) to improve thermal stability; A drive interface (4) is provided on the top of the outer shell (1) for realizing a steady-state rotational shear flow of the liquid in the cylindrical cavity (2); A mounting frame (5) is installed on the top of the outer shell (1) for supporting the drive system; An inner sleeve (6) is provided inside the cylindrical cavity (2) for shearing the liquid, and an outer sleeve (7) is provided outside the inner sleeve (6); A driving assembly is installed between the mounting frame (5) and the inner sleeve (6), and the driving assembly drives the inner sleeve (6) and the outer sleeve (7) to rotate to drive the liquid to flow and form a basic shear flow field; Suction cups (8), with suction cups (8) provided at opposite corners of the bottom of the outer shell (1); A rotating assembly is installed between the outer shell (1) and the suction cup (8), and the rotating assembly drives the suction cup (8) to spread outward to stably support the outer shell (1).

2. The liquid sample stage for Brillouin scattering experiment according to claim 1, characterized in that: The driving assembly comprises: a main motor (9), a driving gear 1 (10), a driven gear 1 (11) and a connecting rod (12); the top of the mounting frame (5) is fixedly connected to the main motor (9); the output end of the main motor (9) passes through the bottom end of the mounting frame (5) and is fixedly connected to the driving gear 1 (10); the side wall of the driving gear 1 (10) is meshedly connected to the driven gear 1 (11); the axis of the driven gear 1 (11) is fixedly connected to the connecting rod (12); the top end of the connecting rod (12) is rotatably connected to the mounting frame (5), and the bottom end thereof is fixedly connected to the top end of the inner sleeve (6).

3. The liquid sample stage for Brillouin scattering experiment according to claim 2, characterized in that: The top end of the mounting frame (5) is fixedly connected to a servo motor (13), the output end of the servo motor (13) passes through the bottom end of the mounting frame (5) and is fixedly connected to a second active tooth (14), the second active tooth (14) is meshedly connected to a second driven tooth (15) on a side close to the first active tooth (10), the axis of the second driven tooth (15) is fixedly connected to the top end of the outer sleeve (7), and the top end of the outer sleeve (7) is rotatably connected to the connecting rod (12).

4. The liquid sample stage for Brillouin scattering experiment according to claim 2, characterized in that: A columnar container (16) for holding a liquid sample is placed inside the cylindrical cavity (2), and the inner sleeve (6) and the outer sleeve (7) are both placed at the inner axis of the columnar container (16).

5. The liquid sample stage for Brillouin scattering experiment according to claim 4, characterized in that: The outer walls of the inner sleeve (6) and the outer sleeve (7) are both provided with spiral grooves.

6. The liquid sample stage for Brillouin scattering experiment according to claim 1, characterized in that: The outer shell (1) is made of transparent acrylic material, and a constant temperature liquid is filled between the outer shell and the cylindrical cavity (2) to improve thermal stability.

7. The liquid sample stage for Brillouin scattering experiment according to claim 1, characterized in that: The rotating assembly comprises: a gear (17) and a rack (18); a mounting groove is provided near the bottom of the outer shell (1); the gear (17) is rotatably connected to the center of the mounting groove; the rack (18) is symmetrically slidably connected to the side wall of the mounting groove; the racks (18) are meshed with the gear (17); and the ends of the racks (18) are fixedly connected to the corresponding suction cups (8).

8. The liquid sample stage for Brillouin scattering experiment according to claim 7, characterized in that: A rotating rod (19) is fixedly connected to the axis of the gear (17), and the bottom end of the rotating rod (19) extends out of the outer wall of the outer shell (1).

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