Device and method for measuring shear modulus of linear material based on optical detection technology

Abstract

The invention discloses a device and a method for measuring the shear modulus of a linear material based on an optical detection technology. The device comprises an optical interferometer, a tension meter and a display screen, the light interferometer comprises a bottom plate, high polymerization nylon, a track device, a left end fixing clamp, a movable reflective mirror, a laser pen, a light and beam splitter, a fixed reflective mirror, an observation screen and a right end fixing frame. The display screen is connected with the tension meter through a wire; the high-polymerization nylon is fixed on the left-end fixing clamp; one end of the high-polymerization nylon is connected to the tension meter, and the tension meter is used for measuring force applied to the high-polymerization nylon; the track device comprises a toothless nut, a toothless screw rod and a movable device; the toothless screw rod is connected with the toothless nut in a rotating or moving mode, the toothless screw rod is fixed to the right end fixing frame, the movable device moves on the toothless screw rod, the toothless nut is installed in the movable device, and the movable reflective mirror is installed above the movable device. And the other end of the high-polymerization nylon is connected with the movable reflective mirror.

Description

Technical Field

[0001] The invention belongs to the field of nondestructive testing, and in particular relates to a device and method for measuring the shear modulus of a linear material based on optical testing technology. Background Art

[0002] Optical testing is an important non-destructive testing technology. By detecting the reflection or transmission, interference, diffraction and other information of light, it can evaluate the performance changes and defects of materials. With the rapid development of optical testing technology, optical testing, laser imaging, micro-manipulation of exotic light and other technologies have shown unique and excellent characteristics in communications, medical treatment, material analysis and testing. However, there are also some problems, such as surface irregularity, deformation uniformity, and dynamic measurement stability. Shear modulus is an important physical quantity that describes the ability of solid materials to resist shear deformation, and is one of the bases for selecting mechanical components.

[0003] The measurement of shear modulus is of great significance for studying the mechanical properties, state and life of materials. The key technology of shear modulus measurement is to measure the small strain generated by the material when it is subjected to stress. How to measure shear modulus is an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for measuring the shear modulus of linear materials based on optical detection technology. The device for measuring the shear modulus has the advantages of easy operation and observation, stable phenomenon and relatively accurate results, so as to solve the technical problems of the shortcomings of existing optical detection technology.

[0005] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] A device for measuring the shear modulus of a linear material based on optical detection technology, comprising an optical interferometer, a tensiometer and a display screen; the optical interferometer comprises a bottom plate, high polymer nylon, a track device, a left end fixing clamp, a movable reflector, a laser pen, a beam splitter, a fixed reflector, an observation screen and a right end fixing frame;

[0007] The bottom plate is installed with a tensile gauge, a left-end fixing clamp, a right-end fixing bracket, a beam splitter, a fixed reflector, a laser pen and an observation screen from left to right in sequence;

[0008] The display screen is connected to the dynamometer via a wire;

[0009] High polymer nylon is fixed to the left end fixing clip;

[0010] One end of the high-polymer nylon is connected to a tensile gauge, which is used to measure the force applied to the high-polymer nylon;

[0011] The track device includes a toothless nut, a toothless screw and a movable device; the toothless screw is connected to the toothless nut by rotating or moving, the toothless screw is fixed on the right end fixing frame, the movable device moves on the toothless screw, the toothless nut is installed inside the movable device, and the movable reflector is installed above the movable device;

[0012] The other end of the high polymer nylon is connected to a movable mirror for measuring the shear modulus of the high polymer nylon.

[0013] Furthermore, the optical interferometer also includes a coarse adjustment hand wheel and a fine adjustment hand wheel;

[0014] The fine-tuning hand wheel is fixed on the base plate and connected to the toothless screw to control the movable reflector, and is used to move the movable reflector in the horizontal direction when the moving distance of the movable reflector is less than or equal to the preset moving distance; the coarse-tuning hand wheel is fixed on the base plate, at the left end of the observation screen, and is connected to the toothless screw to control the movable reflector, and is used to move the movable reflector in the horizontal direction when the moving distance of the movable reflector is greater than the preset moving distance.

[0015] Furthermore, the fixing clamp, the movable reflector, the beam splitter and the observation screen are arranged on the same straight line.

[0016] The present invention also discloses an operation method for measuring the shear modulus of a linear material based on optical detection technology, comprising the following steps:

[0017] When conducting the shear modulus measurement experiment, the deformation of the material is monitored in real time through the observation screen; the coarse adjustment hand wheel and the beam splitter perform beam splitting operations on the light emitted by the laser pen; the fixed reflector reflects the light, and the fine adjustment hand wheel makes fine adjustments to the optical path; the movable reflector cooperates with the track device, and the relative movement of the two realizes the movement of position, thereby changing the optical path; high-polymer nylon is used to apply and measure tension; the display screen records the data of applied force and material deformation; finally, the shear modulus is calculated based on the relationship between force value and deformation and combined with the formula.

[0018] Furthermore, the calculation formula of the shear modulus of high polymer nylon is:

[0019]

[0020] Among them, L is the original length of high-polymer nylon, ν is Poisson's ratio, λ is the wavelength of the light source, d is the diameter of high-polymer nylon, Δk is the order of the ring pattern change under different tensions, and ΔF is the change in tension.

[0021] The device and method for measuring the shear modulus of linear materials based on optical detection technology of the present invention have the following advantages:

[0022] 1. High-precision force measurement and uniform force application

[0023] Through the combination of the dynamometer and the track device, the experiment can accurately monitor the force applied to the material and ensure uniform force application, avoiding uneven distribution of force and ensuring the accuracy and reliability of the experimental results.

[0024] 2. Perfect combination of optics and mechanics

[0025] The use of optical interference technology combined with a precise force application system can accurately measure the deformation of the material without contacting the sample, reducing errors and sample damage in traditional methods and improving measurement accuracy.

[0026] 3. Non-contact measurement

[0027] Optical interferometry technology avoids direct contact with the sample, reduces friction and errors, improves measurement accuracy and protects the sample.

[0028] 4. Real-time data feedback and precise control

[0029] By observing the real-time data feedback on the screen and display, the operator can monitor the deformation and applied force at any time to ensure precise control of experimental conditions, timely adjust experimental parameters and avoid experimental errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A block diagram of the shear modulus measuring device of the present invention is provided;

[0031] Figure 2 Schematic diagram of the shear modulus measuring device of the present invention;

[0032] Figure 3 This is a schematic diagram of the tiny deformation caused by shearing of the object to be tested in the present invention;

[0033] Figure 4 is a light path diagram of the optical interferometer of the present invention;

[0034] Figure 5 It is a schematic diagram of a toothless nut of the present invention;

[0035] Figure 6 It is a schematic diagram of the toothless screw of the present invention.

[0036] Explanation of the markings in the figure: 1. Observation screen; 2. Coarse adjustment hand wheel; 3. Beam splitter; 4. Laser pen; 5. Fixed reflector; 6. Fine adjustment hand wheel; 7. Movable reflector; 8. Fixing clamp; 9. High polymer nylon; 10. Tension gauge; 11. Base plate; 12. Display screen; 13. Track device; 14. Right end fixing bracket. DETAILED DESCRIPTION

[0037] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a device and method for measuring the shear modulus of a linear material based on optical detection technology in conjunction with the accompanying drawings.

[0038] A device for measuring the shear modulus of linear materials based on optical detection technology, such as Figure 1 As shown: including an optical interferometer, a tensiometer 10 and a display screen 12; Figure 2 As shown, the optical interferometer includes a base plate 11, high polymer nylon 9, a track device 13, a left end fixing clamp 8, a movable reflector 7, a laser pen 4, a beam splitter 3, a fixed reflector 5, an observation screen 1 and a right end fixing frame 14.

[0039] The dynamometer 10 , the left-end fixing clamp 8 , the right-end fixing bracket 14 , the beam splitter 3 , the fixed reflector 5 , the laser pen 4 and the observation screen 1 are installed on the bottom plate 11 from left to right in sequence.

[0040] The display screen 12 is connected to the tensiometer 10 through a data acquisition system. The display screen 12 displays the collected interference fringe images or mechanical data (such as the force applied by the tensiometer) in real time to help analyze the mechanical behavior of high-polymer nylon 9.

[0041] The display screen 12 is used to display the experimental data in real time, including information such as the applied force, the deformation degree of the material, the change of the interference fringes of the optical interferometer, etc. Through the display screen 12, the operator can monitor the experimental process in real time, adjust the force application method, and obtain the required data.

[0042] The bottom plate 11 provides a stable supporting platform to ensure the fixation and precise position of each component of the experimental device.

[0043] High polymer nylon 9 is fixed on the left end fixing clip 8;

[0044] One end of the high polymer nylon 9 is connected to a tensile gauge 10, which is used to measure the force applied to the high polymer nylon 9; as the applied force changes, the high polymer nylon (9) deforms under the action of the tension, and the optical interferometer monitors these deformations.

[0045] The tension gauge 10 is used to transmit the applied force and ensure the stability of the applied force.

[0046] The main function of the tensile gauge 10 is to change the deformation of the high polymer nylon 9 by applying precise tension, thereby causing changes in the optical path of the interferometer and affecting the interference pattern. The tensile gauge ensures that the applied force is uniform and controllable, providing a basis for subsequent optical interferometry.

[0047] The beam splitter 3 is used to split the laser beam into two parts, one part is used to measure the deformation of the high polymer nylon 9, and the other part is used to feed back the tensile meter 10. The beam splitter 3 is connected to the laser pen 4, and distributes the laser beam to the observation screen 1, the fixed reflector 5, the movable reflector 7, and the tensile meter 10 through optical fibers or mirrors.

[0048] The laser pen 4 provides a laser light source, which is irradiated onto the high-polymer nylon 9 .

[0049] The fixed reflector 5 is used to reflect the laser beam and guide its path onto the material sample, ensuring that the laser beam accurately irradiates the target position.

[0050] The movable reflector 7 can precisely adjust the angle of the laser beam to ensure that the laser beam accurately irradiates the high-polymer nylon 9 .

[0051] The left end fixing clamp 8 ensures that the high polymer nylon 9 does not move during the experiment. The left end fixing clamp 8 is connected to the bottom plate 11 by screws or clamps to ensure that the high polymer nylon 9 is stably fixed.

[0052] The track device 13 is used to adjust the force applied during the experiment to ensure the uniformity of the force application process.

[0053] The right end fixing frame 14 is fixed on the top of the toothless screw rod. The right end fixing frame 14 is connected with the base plate 11 by screws or clamps to ensure that the track device is suspended.

[0054] The track device 13 includes a toothless nut, a toothless screw and a movable device; the toothless screw is connected to the toothless nut by rotation or movement, the toothless screw is fixed on the right end fixing frame 14, the movable device moves on the toothless screw, the toothless nut is installed inside the movable device, and the movable reflector 7 is installed above the movable device; the toothless screw and the toothless nut are connected by a mutually meshing structure. When the toothless screw is connected to the toothless nut by rotation, the special spiral protrusion or groove on the surface of the toothless screw cooperates with the matching spiral structure in the toothless nut, and the rotation of the screw can drive the nut to move in an axial straight line to achieve rotation-linear motion conversion; when the toothless screw is connected to the toothless nut by movement, the specific linear guide structure of the toothless screw is tightly fitted with the toothless nut, and when the screw moves in a straight line, the nut moves synchronously with it by friction or constraint mechanism.

[0055] The function of the toothless nut is to adjust the linear movement of the toothless nut by rotating the screw, thereby changing the magnitude of the pulling force applied to the high-polymer nylon 9.

[0056] The main function of the toothless nut and the toothless screw is to provide a precise and uniform force application method. By rotating the toothless screw, the operator can accurately adjust the force to ensure that the force is evenly distributed on the high-polymer nylon 9, which helps to obtain accurate optical interference data and experimental results.

[0057] The main function of high-polymer nylon 9 is to serve as a material sample for the experiment. It is deformed by the applied external force, and the optical interferometer monitors the deformation of the material in real time through the optical system. By measuring the deformation, the physical properties of the material such as the shear modulus can be further calculated.

[0058] In the optical interferometer experiment, the toothless screw and the toothless nut provide a precise force adjustment mechanism for the experiment. By rotating the toothless nut, the tensioner 10 moves smoothly and accurately applies force to the high-polymer nylon 9. The tensile meter 10 applies external force through the toothless screw and the toothless nut, causing the high-polymer nylon 9 to deform. The optical interferometer captures the deformation of the material in real time by monitoring the interference fringes generated by its deformation. The display screen 12 is connected to the optical interferometer and the tensile meter, and displays the applied force and the degree of deformation of the high-polymer nylon 9 in real time, helping the operator to monitor the experimental process and obtain data. Through the collaborative work of these components, the experiment can accurately measure the shear modulus and other mechanical properties of the high-polymer nylon 9, ensuring the accuracy and reliability of the experimental data.

[0059] The observation screen 1 is used to display the path of the laser beam passing through the beam splitter 3 and to observe the deformation of the material sample (such as high polymer nylon 9).

[0060] The observation screen 1 is usually fixed at a suitable position of the experimental device, so that the operator can clearly see the optical signal and the deformation of the material sample.

[0061] The optical interferometer also includes a coarse adjustment handwheel 2 and a fine adjustment handwheel 6; the coarse adjustment handwheel 2 is used to adjust the rough position of the movable reflector in the device so as to roughly align the path of the laser beam. The coarse adjustment handwheel is connected to the fixed reflector 5 or the movable reflector 7 through a mechanical connection to help the operator quickly adjust the optical path. The fine adjustment handwheel 6 is used to finely adjust the position of the reflector so as to accurately align the laser beam so that it can accurately irradiate the surface of the material. The fine adjustment handwheel 6 is connected to the movable reflector 7 to finely adjust the position of the reflector to ensure that the beam accurately irradiates the material.

[0062] The fine adjustment hand wheel 6 is fixed on the bottom plate 11, connected with the toothless screw to control the movable reflector 7, and is used to move the movable reflector 7 in the horizontal direction when the moving distance of the movable reflector 7 is less than or equal to the preset moving distance; the coarse adjustment hand wheel 2 is fixed on the bottom plate 11, at the left end of the observation screen 1, connected with the toothless screw to control the movable reflector 7, and is used to move the movable reflector 7 in the horizontal direction when the moving distance of the movable reflector 7 is greater than the preset moving distance. The fixing clamp 8, the movable reflector 7, the beam splitter 3 and the observation screen 1 are arranged on the same straight line.

[0063] When conducting the shear modulus measurement experiment, the deformation of the material is monitored in real time by observing the screen 1; the coarse adjustment hand wheel 2 and the beam splitter 3 perform beam splitting operations on the light emitted by the laser pen 4. The beam splitter 3, with its semi-transparent and semi-reflective characteristics, divides the light emitted by the laser pen 4 into two beams, a transmission beam and a reflection beam, and propagates along different optical paths. The coarse adjustment hand wheel 2 drives the movable reflector 7 to move or rotate by rotating, changing the propagation path and optical path difference of the two beams of light, and realizing the adjustment of the split light path. The fixed reflector 5 reflects the light, and the fine adjustment hand wheel 6 makes fine adjustments to the light path. The fine adjustment hand wheel 6 is connected to the toothless screw. When the fine adjustment hand wheel 6 is rotated, the movable reflector 7 can be driven to produce a slight angle change, thereby adjusting the direction of the reflected light. The movable reflector 7 cooperates with the track device 13 to change the optical path; the high polymer nylon 9 is used to apply and measure the tension; the display screen 12 records the data of the applied force and the material deformation; finally, according to the relationship between the force value and the deformation, the shear modulus is calculated in combination with the formula.

[0064] The following is an introduction to the derivation process of the formula.

[0065] After the instrument is installed according to the above process, the high polymer nylon 9 is placed between the left end fixing clamp 8 and the tensioner 10. The left end fixing clamp 8 will be stretched or shortened after receiving external force along the length direction, that is, deformation occurs. Assume that the cross-sectional area of ​​the high polymer nylon 9 is S. Figure 3 As shown in the figure, the length is L, and an external force F is applied along the length direction to stretch the high-polymer nylon 9 by ΔL. The ratio F / S is the force on the unit cross-section, called stress; the ratio ΔL / L is the relative elongation of the high-polymer nylon 9, called strain, which indicates the magnitude of the deformation of the high-polymer nylon 9.

[0066] According to Hooke's law, the stress and strain of high-polymer nylon 9 within the elastic limit are proportional to each other, and the formula is as follows:

[0067]

[0068] Among them, the proportionality coefficient E is the elastic modulus (or Young's modulus) of the material, and its size is only related to the properties of the material itself, and has nothing to do with the external force F, the original length L of the material, and the cross-sectional area S. Rewrite the formula as:

[0069]

[0070] Therefore, the elastic modulus E is equal to the stress caused by the relative change in unit length. The elastic modulus can be calculated using this formula, where:

[0071] L can be measured with general measuring tools.

[0072] F can be calculated from the mass m of the digital dynamometer in the experiment, F = mg, where g is the acceleration due to gravity.

[0073] S can be obtained by measuring the diameter d of the material,

[0074] After substituting S, the formula becomes:

[0075]

[0076] By using the principle of optical interference and the tensile device 10, the elastic modulus of high polymer nylon 9 can be measured. Then:

[0077]

[0078] Since the movement of the movable reflector 7 causes a slight deformation of the high polymer nylon 9, the change in the corresponding spacing is Δd, which is equal to the elongation ΔL of the high polymer nylon 9, that is, Δd = ΔL. Then, formula (4) can be substituted into formula (3), and we have:

[0079]

[0080] The elastic modulus of high-polymer nylon 9 can be calculated by formula (5).

[0081] The shear modulus and elastic modulus are interrelated, and their relationship is also affected by the Poisson's ratio of the material, which is defined as the ratio of the strain in the tensile or compressive direction to the strain in the perpendicular direction. That is, the formula is:

[0082]

[0083] in:

[0084] Transverse strain refers to the degree to which a material deforms (usually contracts) in the perpendicular direction.

[0085] Axial strain refers to the degree of deformation of the material in the tensile direction.

[0086] The strain is usually calculated as:

[0087]

[0088] in:

[0089] ΔL is the change in length of the material after being subjected to force.

[0090] L0 is the original length of the material.

[0091] For this purpose, a track device 13 is introduced, such as Figure 5 and Figure 6As shown, the track device 13 in the track device 13 is composed of a box with a reversing lever, and there are three iron blocks (the middle iron block and the iron blocks on both sides) in the box. A ball bearing is installed inside each iron block, and the inner ring of the bearing contacts the iron rod, which can drive the iron block to rotate around the vertical axis. When the lever is pushed, the middle iron block deflects, and drives the two adjacent iron blocks to translate in the opposite direction through the protruding column on it. When the inner rings of the bearings of these iron blocks contact the iron rod, friction is generated, and then a component force along the axial direction is generated, pushing the box to move on the iron rod. Through the operation of the lever, the deflection direction of the three iron blocks will change instantly, changing the contact point of the bearing and the direction of the friction force, thereby changing the moving direction of the box. By adjusting the installation position of the bearing in the iron block, the position of the contact point of the bearing with the iron rod is changed. Therefore, the direction conversion and the stepless speed regulation function can be realized, thereby changing the size of the push-pull force.

[0092] In summary, the elastic modulus E and Poisson's ratio ν are known, so the relationship between the elastic modulus E, shear modulus G and Poisson's ratio ν is used. The formula is:

[0093]

[0094] Then we can substitute formula (5) into formula (8) and get:

[0095]

[0096] The shear modulus of high-polymer nylon 9 can be calculated using formula (9).

[0097] Assemble the instrument, install the fixing knobs on both ends of the high polymer nylon 9, put one end into the groove of the tensile gauge 10, and the other end into the appropriate groove of the movable reflector 7, and adjust appropriately to keep the line in a horizontal state. Next, adjust the coarse adjustment hand wheel 2, start the optical interferometer, the track device 13 begins to deflect and change the bearing contact mode, and the movable reflector 7 moves, so that the high polymer nylon 9 undergoes a slight deformation, generating a force. At this time, the display screen 12 will directly display the magnitude of the applied force.

[0098] like Figure 4As shown, first adjust the optical interferometer to be roughly horizontal, turn on the helium-neon laser light source (λ=632.8nm), and let the laser enter along the vertical direction of the movable reflector 7. Then, adjust the fixed reflector 5 and the movable reflector 7 through the coarse adjustment hand wheel 2 so that the two are roughly parallel. Adjust the screws on the back of the two and the tension spring screw under the movable reflector 7 to make the fixed reflector 5 roughly parallel, and avoid over-tightening or over-loosening the screws. Lower the observation screen 1, adjust the position of the fixed reflector 5 until the brightest points in the two rows of light spots coincide, and ensure that the fixed reflector 5 is parallel. After observing the interference fringes, adjust the position of the movable reflector 7 so that the center of the ring pattern is aligned with the screen. Turn the coarse adjustment hand wheel 2, record the order Δk of the ring pattern change under different tensions, and draw a relationship graph between the tension and the order change. Finally, calculate the ratio of the tension F to the order Δk. Substitute the known original length L and diameter d of high polymer nylon into the formula to obtain the elastic modulus:

[0099]

[0100] The shear modulus and elastic modulus are interrelated, and their relationship is affected by the Poisson's ratio of the material. In summary, the relationship between the elastic modulus E, shear modulus G and Poisson's ratio ν is:

[0101]

[0102] The shear modulus of high polymer nylon 9 can be calculated using the elastic modulus E:

[0103]

[0104] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A device for measuring the shear modulus of linear materials based on optical detection technology, characterized in that: It comprises an optical interferometer, a tensiometer (10) and a display screen (12); the optical interferometer comprises a base plate (11), high polymer nylon (9), a track device (13), a left end fixing clamp (8), a movable reflector (7), a laser pen (4), a beam splitter (3), a fixed reflector (5), an observation screen (1) and a right end fixing frame (14); The bottom plate (11) is provided with a tensiometer (10), a left-end fixing clamp (8), a right-end fixing frame (14), a beam splitter (3), a fixed reflector (5), a laser pen (4) and an observation screen (1) in sequence from left to right; The display screen (12) is connected to the tensile gauge (10) via a wire; The high polymer nylon (9) is fixed on the left end fixing clamp (8); One end of the high-polymer nylon (9) is connected to a tensile gauge (10), and the tensile gauge (10) is used to measure the force applied to the high-polymer nylon (9); The track device (13) comprises a toothless nut, a toothless screw and a movable device; the toothless screw is connected to the toothless nut by rotation or movement, the toothless screw is fixed on the right end fixing frame (14), the movable device moves on the toothless screw, the toothless nut is installed inside the movable device, and the movable reflector (7) is installed above the movable device; The other end of the high-polymer nylon (9) is connected to a movable reflector (7) for measuring the shear modulus of the high-polymer nylon (9).

2. The device for measuring the shear modulus of linear materials based on optical detection technology according to claim 1, characterized in that: The optical interferometer also includes a coarse adjustment hand wheel (2) and a fine adjustment hand wheel (6); The fine adjustment hand wheel (6) is fixed on the base plate (11), connected with the toothless screw to control the movable reflector (7), and is used to move the movable reflector (7) in the horizontal direction when the moving distance of the movable reflector (7) is less than or equal to the preset moving distance; the coarse adjustment hand wheel (2) is fixed on the base plate (11), at the left end of the observation screen (1), connected with the toothless screw to control the movable reflector (7), and is used to move the movable reflector (7) in the horizontal direction when the moving distance of the movable reflector (7) is greater than the preset moving distance.

3. The device for measuring the shear modulus of linear materials based on optical detection technology according to claim 1, characterized in that: The fixing clamp (8), the movable reflector (7), the light splitting beam splitter (3) and the observation screen (1) are arranged on the same straight line.

4. An operating method for measuring the shear modulus of a linear material based on optical detection technology, used in the device for measuring the shear modulus of a linear material based on optical detection technology as described in claims 1-3, characterized in that: The steps include: When conducting a shear modulus measurement experiment, the deformation of the material is monitored in real time through an observation screen (1); the coarse adjustment hand wheel and the beam splitter (3) perform beam splitting operations on the light emitted by the laser pen (4); the fixed reflector (5) reflects the light, and the fine adjustment hand wheel (6) finely adjusts the light path; the movable reflector (7) cooperates with the track device (13), and the relative movement of the two realizes the movement of the position, thereby changing the light path; the high polymer nylon (9) is used to apply and measure the tension; The display screen (12) records the data of applied force and material deformation; finally, the shear modulus is calculated based on the relationship between the force value and the deformation and the formula.

5. The method for measuring the shear modulus of a linear material based on optical detection technology according to claim 4, characterized in that: The calculation formula of the shear modulus of high polymer nylon (9) is: Wherein, L is the original length of the high polymer nylon (9), ν is the Poisson's ratio, λ is the wavelength of the light source, d is the diameter of the high polymer nylon (9), Δk is the order of the ring pattern change under different tensions, and ΔF is the change in tension.

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