Linear expansion coefficient tester with optical interference structure

Abstract

The utility model provides a linear expansion coefficient tester with an optical interference structure, and solves the technical problems that infinitesimal displacement during solid expansion cannot be amplified in the prior art, and more visual observation is not facilitated. The linear expansion coefficient tester with the optical interference structure comprises a digital display temperature controller and further comprises a mounting mechanism for placing a test sample, the digital display temperature controller is connected with the mounting mechanism to heat and control the temperature of the test sample, the end part of the test sample is connected with a laser transmitter, and the laser transmitter is connected with the optical interference structure. And a single-slit plate, a double-slit plate and a curtain plate for laser irradiation are sequentially arranged right above the laser transmitter at intervals. The measurement sample is heated at different temperatures and then subjected to double-slit interference of laser to measure corresponding stripes, the linear expansion coefficient is measured through stripe intervals at different temperatures, infinitesimal displacement during solid expansion is amplified, more visual observation is facilitated, and the linear expansion coefficient of a material can be measured very accurately.

Description

Technical Field

[0001] The utility model relates to the field of linear expansion coefficient measuring instruments, in particular to a linear expansion coefficient measuring instrument with an optical interference structure. Background Art

[0002] With the development of science and technology, the measurement and calculation methods of linear expansion coefficient have been continuously improved and perfected. Michelson interferometer method, micrometer method, bridge method, reading microscope method and other methods are usually used to measure the corresponding small displacement changes. The above methods have their own advantages and disadvantages. For example, the micrometer method is easy to operate and the principle is simple and easy to understand, but it has high precision requirements. Due to its own mechanical structure and other reasons, the error is relatively large; while the Michelson interferometer method has high measurement accuracy, but its anti-interference ability is weak, and the requirements for the experimental environment are high. Slight disturbances in the experiment, such as the shaking of the table, will cause errors.

[0003] In order to solve the above-mentioned problems of inaccurate measurement data and weak anti-interference ability caused by parallax in the readings of the mechanical structure itself, the optical lever mirror method is currently mainly used. For example, the Chinese utility model patent with an authorization announcement date of 2022.4.19 and an authorization announcement number of CN216350456U discloses a device for measuring the linear expansion coefficient of metal using equal thickness interference. The device for measuring the linear expansion coefficient of metal using equal thickness interference includes a base, a temperature control component, a laser, a beam splitter and a CCD camera module. A height-adjustable and horizontal support plate is provided on the base, and a lower optical glass plate and an upper optical glass plate for combining to form an air wedge are stacked on the support plate. The lower optical glass plate and the metal rod to be measured are both arranged below the upper optical glass plate, and the beam splitter and the CCD camera module are both arranged on the laser light path emitted by the laser.

[0004] Although the above device solves the problems of inaccurate measurement data and weak anti-interference ability of the existing metal linear expansion coefficient measurement device, it cannot amplify the tiny displacement during solid expansion, which is not conducive to more intuitive observation. Utility Model Content

[0005] To this end, the utility model proposes a linear expansion coefficient measuring instrument with an optical interference structure, which solves the technical problem that the prior art cannot amplify the tiny displacement of solid expansion, which is not conducive to more intuitive observation.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A linear expansion coefficient measuring instrument with an optical interference structure includes a digital temperature controller and a mounting mechanism for placing a test sample. The digital temperature controller is connected to the mounting mechanism to heat and control the temperature of the test sample. The end of the test sample is connected to a laser emitter, and a single-slit plate, a double-slit plate, and a curtain plate for laser irradiation are sequentially arranged above the laser emitter. After the measurement sample is heated at different temperatures, the corresponding stripes are measured by double-slit interference of the laser. The linear expansion coefficient is measured by the stripe spacing at different temperatures, and the tiny displacement when the solid expands is magnified, which is conducive to more intuitive observation, and the linear expansion coefficient of the material can be measured very accurately.

[0008] Furthermore, the installation mechanism includes a uniform heat-conducting tube for placing the measured sample, and the outer circumference of the uniform heat-conducting tube is sequentially provided with a heating coil and a heat-insulating tube connected to a digital temperature controller. By adding a uniform heat-conducting tube, a heating coil and a heat-insulating tube to the installation mechanism, uniform heating and temperature control of the test sample can be achieved. The uniform heat-conducting tube can transfer heat to the test sample evenly to ensure the overall temperature uniformity of the sample; the heating coil can provide a constant heating power so that the temperature can be precisely controlled; the heat-insulating tube can reduce heat loss and improve the accuracy of the measurement. These designs can effectively eliminate the errors caused by uneven temperature and ensure the accuracy and reliability of the measurement results.

[0009] Furthermore, a support ring is provided on the inner wall of the uniform heat-conducting pipe, and the measurement sample is slidably arranged in the support ring. The support ring can provide support and fixation for the measurement sample to prevent it from deflecting or vibrating. By sliding the measurement sample in the support ring, it can be ensured that the contact between the sample and the uniform heat-conducting pipe is close, thereby achieving a better heat conduction effect. Such a design can reduce heat loss and non-uniformity, and improve the accuracy and reliability of the measurement results.

[0010] Furthermore, both ends of the uniform heat-conducting pipe are fixedly connected with columnar clips, and the columnar clips are plugged into the inner wall of the uniform heat-conducting pipe and the inner wall of the insulation pipe. The existence of the columnar clips can make the connection between the uniform heat-conducting pipe and the insulation pipe more secure, which can effectively prevent heat leakage and improve heat conduction efficiency.

[0011] Furthermore, a heat-insulating rod is provided between the laser emitter and the test sample. The presence of the heat-insulating rod can effectively reduce the heat transfer from the laser emitter to the test sample. This can ensure that the test sample maintains a relatively stable temperature during laser irradiation, thereby reducing the impact of temperature on the test results. The heat-insulating rod can also prevent the laser emitter from being disturbed by the heat of the test sample, thereby improving the accuracy of the test.

[0012] Furthermore, the heat-insulating rod is slidably extended from the columnar buckle, and the length of the heat-insulating rod can be flexibly adjusted to adapt to test samples of different sizes.

[0013] Furthermore, the lower end of the laser emitter is connected to a base, the lower end of the base is provided with a base, and the base is slidably connected to the upper part of the base. The laser emitter can be installed and fixed on the test equipment more stably. The connection method of the base can realize the convenient installation and disassembly of the laser emitter, and improve the convenience of operation. At the same time, the sliding connection of the base allows the laser emitter to be adjusted in different positions to meet different experimental requirements.

[0014] Furthermore, a connecting plate is connected to the upper end of the base, and the ends of the single-slit plate, double-slit plate and curtain plate are fixedly connected to one side of the connecting plate. The connecting plate is fixedly connected to the ends of the single-slit plate, double-slit plate and curtain plate to achieve their stable fixation. This design allows the single-slit plate, double-slit plate and curtain plate to maintain a solid position under the support of the connecting plate, effectively preventing them from moving or loosening.

[0015] Furthermore, the base is mounted with a bracket, the bracket is perpendicular to the base, and the uniform heat conduction pipe, the measurement sample, and one end of the insulation pipe are fixedly connected to the bracket and parallel to the base. By fixing the bracket on the base and placing the mounting mechanism on the bracket, a more stable installation and support is achieved. The fixed connection of the bracket provides a strong supporting force, which can effectively prevent the shaking and movement of the mounting mechanism. This structural design allows the mounting mechanism to remain stable under the support of the bracket, thereby improving the stability and reliability of the test equipment.

[0016] Furthermore, the uniform heat pipe is connected to a temperature sensor, and the temperature sensor is electrically connected to the digital temperature controller. This enables the test equipment to accurately control and adjust the temperature of the uniform heat pipe, thereby ensuring temperature stability and consistency during the test. The combination of the temperature sensor and the digital temperature controller allows the operator to conveniently monitor and adjust the temperature, thereby improving the control accuracy of the test equipment.

[0017] The beneficial effects of the utility model are:

[0018] In the embodiment of the utility model, the measurement sample is connected to the installation mechanism, and the double-slit mechanism is irradiated by a laser perpendicular to the measurement sample, so that the fringes after the laser interference can be measured, and the heating ring is controlled by the digital display temperature controller to heat the uniform heat conduction tube to achieve heating of the measurement sample, and a temperature sensor is connected in the uniform heat conduction tube, and the heating temperature of the measurement sample can be detected in real time by the temperature sensor, which is convenient for temperature regulation, and the measurement sample is heated at different temperatures and then the double-slit interference of the laser is performed to measure the corresponding fringes, and the linear expansion coefficient is measured by the fringes spacing at different temperatures, and the tiny displacement when the solid expands is magnified, which is conducive to more intuitive observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model.

[0020] Figure 2 Figure 2 is a diagram of the present utility model.

[0021] Figure 3 for Figure 2 A is an enlarged view of the middle image.

[0022] Figure 4 for Figure 2 Enlarged view of B.

[0023] Figure 5 This is a schematic diagram of the measurement sample connection of the utility model.

[0024] Figure 6 It is a schematic diagram of the experimental principle of the utility model.

[0025] Description of reference numerals:

[0026] 1. Base, 2. Bracket, 3. Heating coil, 4. Uniform heat conduction pipe, 5. Measuring sample, 6. Insulation pipe, 7. Temperature sensor, 8. Insulation rod, 9. Double-slit mechanism, 10. Digital temperature controller, 11. Columnar clip, 12. Support ring, 13. Base, 14. Laser emitter, 15. Single-slit plate, 16. Double-slit plate, 17. Curtain plate, 18. Connecting plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific implementation methods and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Embodiment 1, a linear expansion coefficient measuring instrument having an optical interference structure, such as Figure 1As shown, it includes a digital temperature controller 10 and a mounting mechanism for placing a test sample. The digital temperature controller 10 is connected to the mounting mechanism to heat and control the temperature of the test sample. The end of the test sample is connected to a laser emitter 14. A single-slit plate 15, a double-slit plate 16, and a curtain plate 17 for laser irradiation are sequentially arranged above the laser emitter 14. After the measurement sample 5 is heated at different temperatures, the corresponding stripes are measured by double-slit interference of the laser. The linear expansion coefficient is measured by the stripe spacing at different temperatures, and the tiny displacement during solid expansion is magnified, which is conducive to more intuitive observation, and the linear expansion coefficient of the material can be measured very accurately.

[0030] Example 2, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 , Figure 2 As shown, the difference from Example 1 is that the installation mechanism includes a uniform heat pipe 4 for placing the measurement sample 5, and the outer periphery of the uniform heat pipe 4 is sequentially provided with a heating coil 3 and a thermal insulation tube 6 connected to a digital display temperature controller 10. By adding the uniform heat pipe 4, the heating coil 3 and the thermal insulation tube 6 to the installation mechanism, uniform heating and temperature control of the test sample can be achieved. The uniform heat pipe 4 can transfer heat to the test sample evenly to ensure the overall temperature uniformity of the sample; the heating coil 3 can provide a constant heating power so that the temperature can be precisely controlled; the thermal insulation tube 6 can reduce heat loss and improve the accuracy of the measurement. These designs can effectively eliminate the errors caused by uneven temperature and ensure the accuracy and reliability of the measurement results.

[0031] Example 3, as a preferred embodiment of a linear expansion coefficient measuring instrument with an optical interference structure, Figure 2 , Figure 5 As shown, the difference from Example 2 is that a support ring 12 is provided on the inner wall of the uniform heat pipe 4, and the measurement sample 5 is slidably inserted into the support ring 12. The support ring 12 can provide support and fixation for the measurement sample 5 to prevent it from deflecting or vibrating. By sliding the measurement sample 5 into the support ring 12, it can ensure that the contact between the sample and the uniform heat pipe 4 is close, thereby achieving a better heat conduction effect. Such a design can reduce heat loss and unevenness, and improve the accuracy and reliability of the measurement results.

[0032] Example 4, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 , Figure 2As shown, the difference from Example 3 is that both ends of the uniform heat-conducting pipe 4 are fixedly connected with columnar fasteners 11, and the columnar fasteners 11 are respectively inserted into the inner wall of the uniform heat-conducting pipe 4 and the inner wall of the insulation pipe 6. The existence of the columnar fasteners 11 can make the connection between the uniform heat-conducting pipe 4 and the insulation pipe 6 more secure. This can effectively prevent heat leakage and improve heat conduction efficiency.

[0033] Example 5, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 , Figure 3 As shown, the difference from Example 4 is that a heat-insulating rod 8 is provided between the laser emitter 14 and the test sample. The presence of the heat-insulating rod 8 can effectively reduce the heat transfer from the laser emitter 14 to the test sample. This can ensure that the test sample maintains a relatively stable temperature during laser irradiation, thereby reducing the impact of temperature on the test results. The heat-insulating rod 8 can also prevent the laser emitter 14 from being disturbed by the heat of the test sample, thereby improving the accuracy of the test.

[0034] Example 6, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 3 As shown, the difference from embodiment 5 is that the heat-insulating rod 8 slides out of the columnar buckle 11. The length of the heat-insulating rod 8 can be flexibly adjusted to adapt to test samples of different sizes.

[0035] Example 7, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 As shown, the difference from the above embodiment is that the lower end of the laser emitter 14 is connected to a base 13, the lower end of the base 13 is provided with a base 1, and the base 13 is slidably connected to the upper part of the base 1. The laser emitter 14 can be installed and fixed on the test equipment more stably. The connection method of the base 13 can realize the convenient installation and disassembly of the laser emitter 14, and improve the convenience of operation. At the same time, the sliding connection of the base 1 allows the laser emitter 14 to be adjusted in different positions to meet different experimental requirements.

[0036] Example 8, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 As shown, the difference from Example 7 is that a connecting plate 18 is connected to the upper end of the base 1, and the ends of the single-slit plate 15, the double-slit plate 16 and the curtain plate 17 are fixedly connected to one side of the connecting plate 18. The connecting plate 18 is fixedly connected to the ends of the single-slit plate 15, the double-slit plate 16 and the curtain plate 17 to achieve their stable fixation. This design allows the single-slit plate 15, the double-slit plate 16 and the curtain plate 17 to maintain a solid position under the support of the connecting plate 18, effectively preventing them from moving or loosening.

[0037] Example 9, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 , Figure 2 As shown, the difference from Example 8 is that the base 1 is mounted with a bracket 2, the bracket 2 is perpendicular to the base 1, and one end of the uniform heat pipe 4, the measurement sample 5, and the insulation pipe 6 are fixedly connected to the bracket 2 and parallel to the base 1. The fixed connection of the bracket 2 provides a strong supporting force, which can effectively prevent the shaking and movement of the installation mechanism. This structural design allows the installation mechanism to remain stable under the support of the bracket 2, thereby improving the stability and reliability of the test equipment.

[0038] Example 10, as a preferred embodiment of a linear expansion coefficient measuring instrument having an optical interference structure, Figure 1 , Figure 2 As shown, the difference from Example 9 is that the uniform heat pipe 4 is connected to a temperature sensor 7, and the temperature sensor 7 is electrically connected to the digital temperature controller 10. This enables the test equipment to accurately control and adjust the temperature of the uniform heat pipe 4, thereby ensuring the temperature stability and consistency during the test. The combination of the temperature sensor 7 and the digital temperature controller 10 allows the operator to conveniently monitor and adjust the temperature, thereby improving the control accuracy of the test equipment.

[0039] Embodiment 11, as Figure 1-6 As shown, a novel linear expansion coefficient measuring device includes a digital temperature controller 10, a mounting mechanism and a double-slit mechanism 9. The digital temperature controller 10 is connected to the mounting mechanism for heating and temperature control, and the double-slit mechanism 9 is connected to the mounting mechanism for double-slit interference of laser.

[0040] In order to connect the measurement sample 5 and heat it, the installation mechanism includes an insulation tube 6, a uniform heat-conducting tube 4 and a heating coil 3. The uniform heat-conducting tube 4 is fixed in the insulation tube 6. Several heating coils 3 are connected to the outer periphery of the uniform heat-conducting tube 4. The measurement sample 5 is arranged in the uniform heat-conducting tube 4. The end of the measurement sample 5 is connected to an insulation rod 8, and the insulation rod 8 is connected to a double-slit mechanism 9.

[0041] In order to stably support the measurement sample 5 in the uniform heat-conducting pipe 4, a support ring 12 is symmetrically connected inside the uniform heat-conducting pipe 4, and the support ring 12 is adapted to the inner wall of the uniform heat-conducting pipe 4. The measurement sample 5 is slidably inserted into the support ring 12. Both ends of the uniform heat-conducting pipe 4 are fixedly connected with a columnar clip 11, and one end of the columnar clip 11 is plugged and adapted to the inner wall of the uniform heat-conducting pipe 4, and the other end of the columnar clip 11 is plugged and adapted to the inner wall of the insulation pipe 6.

[0042] The heat-insulating rod 8 slides out from the other end of the columnar fastener 11 to be connected to the laser emitter 14 in the double-slit mechanism 99 , thereby transmitting the expansion of the measurement sample 5 to the laser emitter 14 .

[0043] In order to perform double-slit interference through the laser emitter 14 and thus generate bright fringes, the double-slit mechanism 9 includes a laser emitter 14, a single-slit plate 15, a double-slit plate 16 and a curtain plate 17. The laser emitter 14 is connected to the heat-insulating rod 8. The single-slit plate 15 is arranged at the upper end of the laser emitter 14. The double-slit plate 16 is arranged at the upper end of the single-slit plate 15. The curtain plate 17 is arranged at the upper end of the double-slit plate 16. The lower end of the laser emitter 14 is fixedly connected to a base 13. The lower end of the base 13 is provided with a base 1. The base 13 is slidably connected to the upper end of the base 1. The upper end of the base 1 is fixedly connected to a connecting plate 18. The ends of the single-slit plate 15, the double-slit plate 16 and the curtain plate 17 are all fixedly connected to one side of the connecting plate 18. A bracket 2 is fixedly connected to the base 1, and the heat-insulating tube 6 is arranged on the bracket 2.

[0044] In order to monitor the heating temperature of the measurement sample 5 in real time and then regulate the temperature, a temperature sensor 7 is connected to the uniform heat conduction tube 4, and the electrical signal of the temperature sensor 7 is connected to the digital display temperature controller 10, and the electrical signal of the heating coil 3 is connected to the digital display temperature controller 10.

[0045] When the utility model is used, the measuring sample 5 is connected to the installation mechanism, the heat insulation rod 8 is connected to the double-slit mechanism 9, and the laser emitter 14 is used to emit laser. The laser generates corresponding bright fringes on the curtain plate 17 through the interference of the single-slit plate 15 and the double-slit plate 16. The heating coil 3 is controlled by the digital display temperature controller 10 to heat the uniform heat conduction pipe 4, so that the uniform heat conduction pipe 4 heats the measuring sample 5. The heated temperature is measured in real time by the temperature sensor 7. After the measuring sample 55 is heated, it expands and drives the heat insulation rod 8 to deflect. The heat insulation rod 8 drives the laser emitter 14 to deflect, so that the bright fringes on the curtain plate 17 are deflected. The double-slit mechanism 9 is irradiated with laser at different heating temperatures. Different bright fringes are obtained due to the different emission points of the laser emitter 14 at different temperatures. The linear expansion coefficient is obtained by calculating the spacing of different fringes.

[0046] like Figure 6 The experimental principle shown is:

[0047] In a double-slit interference, when the light source deviates from the central axis by a distance x, the following relationship holds:

[0048]

[0049] Where y is the distance from each level of bright fringe to the central axis.

[0050] Since α and θ are both very small, we have the approximation: sinα≈α≈tanα, sinθ≈θ≈tanθ.

[0051] Figure 6 The optical path difference on the left side of BC is: The optical path difference on the right is:

[0052]

[0053] Since the optical path difference of the central bright fringe is zero, that is, δ1-δ2=0, we have:

[0054] When the position of the light source moves from x1 to x2 near the central axis,

[0055] At room temperature, the relationship between the length L of a solid after heating and the temperature t can be written as: L=L0(1+αt), where L0 is the initial length of the solid and α is the linear expansion coefficient of the solid.

[0056] When the temperature increases from t1 to t2, the length of the solid expands from L1 to L2, and the linear expansion coefficient of the solid is:

[0057] Since the difference between L1 and L2 is small, that is, Therefore, the above formula can be written as:

[0058] When the linear expansion of a solid is represented by the movement of a light source, ΔL = Δx, that is, the linear expansion coefficient of the solid is:

[0059]

[0060] In summary, in the embodiment of the utility model, the measurement sample 5 is connected to the installation mechanism, and is vertically irradiated by the laser reflector in the double-slit mechanism 9. The laser passes through the single-slit plate 15 and the double-slit plate 16 and interferes to generate bright fringes on the curtain plate 17. The heating coil 3 is controlled by the digital temperature controller 10 to heat the uniform heat conduction pipe 4 and thus realize the heating of the measurement sample 5. The uniform heat conduction pipe 4 is connected with a temperature sensor 7, and the heating temperature of the measurement sample 5 can be detected in real time by the temperature sensor 7, which is convenient for temperature regulation. After being heated at different temperatures, the measurement sample 5 expands to different degrees, which is transmitted to the laser emitter 14 through the insulation rod 8, causing the laser emitter 14 to deviate, thereby generating corresponding bright fringes at different temperatures on the curtain plate 17, and the linear expansion coefficient is measured by the spacing of the bright fringes at different temperatures. The operation is simple and convenient, and the measurement result is accurate.

[0061] Although the present invention has been disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A linear expansion coefficient measuring instrument with an optical interference structure, comprising a digital display temperature controller (10), characterized in that: It also includes a mounting mechanism for placing a test sample (5), the digital display temperature controller (10) is connected to the mounting mechanism to heat and control the temperature of the test sample (5), the end of the test sample (5) is connected to a laser emitter (14), and a single-slit plate (15), a double-slit plate (16), and a curtain plate (17) for laser irradiation are sequentially arranged at intervals directly above the laser emitter (14).

2. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 1, characterized in that: The installation mechanism comprises a uniform heat conduction pipe (4) on which a test sample (5) is placed, and a heating ring (3) and a heat insulation pipe (6) connected to a digital temperature controller (10) are sequentially arranged on the outer periphery of the uniform heat conduction pipe (4).

3. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 2, characterized in that: The inner wall of the uniform heat conducting pipe (4) is provided with a support ring (12), and the test sample (5) is slidably inserted into the support ring (12).

4. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 3, characterized in that: Both ends of the uniform heat-conducting pipe (4) are fixedly connected with columnar clips (11), and the columnar clips (11) are plugged into the inner wall of the uniform heat-conducting pipe (4) and the inner wall of the heat-insulating pipe (6).

5. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 4, characterized in that: A heat-insulating rod (8) is provided between the laser emitter (14) and the test sample (5).

6. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 5, characterized in that: The heat-insulating rod (8) slides out of the columnar buckle (11).

7. The linear expansion coefficient measuring instrument with an optical interference structure according to any one of claims 2 to 6, characterized in that: The lower end of the laser emitter (14) is connected to a base (13), the lower end of the base (13) is provided with a base (1), and the base (13) is slidably connected to the upper part of the base (1).

8. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 7, characterized in that: The upper end of the base (1) is connected to a connecting plate (18), and the ends of the single-slit plate (15), the double-slit plate (16) and the curtain plate (17) are all fixedly connected to one side of the connecting plate (18).

9. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 7, characterized in that: The base (1) is mounted with a bracket (2), the bracket (2) being perpendicular to the base (1), and one end of the uniform heat conduction pipe (4), the test sample (5), and the heat insulation pipe (6) are all fixedly connected to the bracket (2) and parallel to the base (1).

10. The linear expansion coefficient measuring instrument with an optical interference structure according to claim 9, characterized in that: The uniform heat conduction pipe (4) is connected to a temperature sensor (7), and the temperature sensor (7) is electrically connected to the digital display temperature controller (10).

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