Novel Michelson thermosensitive refractive index measurement interferometer

Abstract

The utility model relates to the technical field of interference devices, in particular to a novel Michelson thermosensitive refractive index measurement interferometer which comprises a mounting table. Four trusses are fixed to the top end of the mounting table, reflector assemblies are fixed to the top ends of the trusses, adjusting assemblies are fixed to one sides of the trusses, receiving structures are fixed to one sides of the adjusting assemblies, the adjusting assemblies comprise mounting plates, rotating rods arranged on the two sides of the mounting plates and positioning plates arranged on the outer sides of the rotating rods in a sleeving mode, and groove structures are formed in the two sides of the mounting plates. The rotating rod is inserted into the groove body structure, the outer side of the rotating rod is sleeved with a rotating cylinder, the rotating cylinder drives the rotating rod to rotate, then the rotating cylinder drives the mounting plate and the receiving structure to move front and back, and the effect of adjusting the width distance is achieved, and in a connecting cylinder, a rotating shaft can be driven to rotate through a rotating plate, and the receiving structure at the bottom is driven to adjust the height; meanwhile, a vertical arrangement structure is matched, and the direction of a light path is changed by adjusting an adjusting assembly of the instrument, so that the experiment is better carried out.

Description

TECHNICAL FIELD

[0001] The utility model relates to interference device technical field, concretely relates to a new -type michelson thermal refractive index determination interferometer. BACKGROUND

[0002] As an important parameter of the optical characteristics of transparent and translucent material, the refractive index will change with the change of temperature. Understanding the influence of liquid temperature on its refractive index is helpful for high-precision optical instrument design, monitoring of liquid properties in chemical process, and environmental control in scientific experiments, which has important theoretical and practical significance. Refractive index is an index to reveal the optical performance of light transmission through transparent or translucent medium, which is related to many factors, of which temperature is an important but complex variable.

[0003] Because temperature is changing all the time, the common methods for measuring liquid refractive index, such as traditional michelson interferometer method, newton ring method and colorimetric method, cannot control constant temperature, the instrument is too large, the applicable scene is less and the measurement error is large. UTILITY MODEL CONTENT

[0004] TECHNICAL PROBLEM

[0005] In view of the above shortcomings of the prior art, the utility model provides a new -type michelson thermal refractive index determination interferometer, which can effectively solve the problems of the prior art, such as the inability to control constant temperature, the instrument being too large, the applicable scene being less and the measurement error being large.

[0006] TECHNICAL SCHEME

[0007] To achieve the above purpose, the utility model realizes the following technical scheme:

[0008] The utility model provides a new -type michelson thermal refractive index determination interferometer, which comprises a mounting table, four groups of trusses are fixed at the top of the mounting table, a mirror assembly is fixed at the top of the truss, an adjusting assembly is fixed on one side of the truss, a receiving structure is fixed on one side of the adjusting assembly, the adjusting assembly comprises a mounting plate, a rotating rod arranged on both sides of the mounting plate and a positioning plate sleeved on the outside of the rotating rod, slot structures are formed in both sides of the mounting plate, the rotating rod is inserted into the slot structure, a rotating drum is sleeved on the outside of the rotating rod, the rotating drum is fixed at the bottom of the two positioning plates, a connecting barrel is fixed on the outside of the positioning plate, a rotating shaft structure is arranged in the middle of the connecting barrel, the bottom end of the rotating shaft is in engagement with the top end of the receiving structure, the mirror assembly comprises two groups of oppositely arranged mirrors and a colorimetric cup arranged in the middle of the mirror, and a light splitting plate is fixed on one side of the truss.

[0009] Further, the outer side of the two groups of rotating rods and rotating shafts is provided with a threaded structure.

[0010] Further, the outer side of the rotating rod and rotating shaft is respectively fixed with a rotating block and a rotating plate.

[0011] Further, the top end of the receiving structure and the rotating cylinder are provided with a threaded groove.

[0012] Further, the minimum graduation of the rotating rod and rotating shaft is 0.001mm.

[0013] Further, the light splitting plate is an inclined structure.

[0014] Beneficial effects

[0015] The technical scheme provided by the utility model compared with prior art has the following beneficial effects:

[0016] 1. In the device, the adjusting assembly structure is set, the user can rotate the rotating block structure, drive the rotating rod to rotate, and then drive the mounting plate and the receiving structure to move forward and backward through the rotating cylinder, so as to adjust the width distance, and in the connecting cylinder, the rotating plate can drive the rotating shaft to rotate, drive the receiving structure at the bottom to adjust the height, and at the same time, cooperate with the vertical arrangement structure, change the light path direction through the adjusting assembly of the adjusting instrument, so that the experiment is better.

[0017] 2. In the device, the improved Michelson interferometer, the colorimetric cup and the double prism composite device are used to measure the refractive index of liquid under dynamic temperature. In the traditional experiment, the temperature needs to be controlled in a constant interval, and then the refractive index is measured, and there are problems of great operation difficulty and low practicability. The combination of the colorimetric cup and the double prism can obtain the initial refractive index of the liquid solution and the change rate of the refractive index of the solution under different temperatures, and then obtain the empirical formula of the temperature and the refractive index, and a device for measuring the refractive index of liquid and the temperature coefficient of the medium of liquid is designed by combining the colorimetric cup and the double prism. The device can realize the refractive index measurement of liquid under dynamic temperature, and the experiment also integrates MATLAB technology and optical sensing technology, and the computer program is used to replace manual reading, so as to reduce the subjective error in measurement and significantly improve the accuracy of experimental measurement. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 Figure 2 is another structural schematic diagram of the present application;

[0021] Figure 3 Figure 3 is a structure disassembly diagram of the present application;

[0022] Figure 4 Figure 4 is an experimental optical path diagram of the present application;

[0023] Figure 5 Figure 5 is an optical path diagram when temperature changes in the present application.

[0024] The labels in the figure respectively represent: 1, mounting table; 2, truss; 3, light splitting plate; 4, mirror assembly; 5, receiving structure; 6, adjusting assembly; 61, mounting plate; 62, rotating rod; 63, rotating block; 64, rotating cylinder; 65, positioning plate; 66, rotating plate; 67, connecting cylinder. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The present application will be further described below in combination with the embodiments.

[0027] Embodiment: A new type of Michelson thermal refractive index measuring interferometer, referring to the attached Figure 1 -attached Figure 5, including the installation platform 1; the top of the installation platform 1 is fixed with four groups of trusses 2, the top of the truss 2 is fixed with a mirror assembly 4, one side of the truss 2 is fixed with an adjusting assembly 6, one side of the adjusting assembly 6 is fixed with a receiving structure 5, the adjusting assembly 6 includes a mounting plate 61, a rotating rod 62 arranged on both sides of the mounting plate 61 and a positioning plate 65 sleeved on the outside of the rotating rod 62, the both sides of the mounting plate 61 are provided with groove structures, and the rotating rod 62 is inserted into the groove structure, the outside of the rotating rod 62 is sleeved with a rotating drum 64, the rotating drum 64 is fixed to the bottom of the both sides of the positioning plate 65, the outside of the positioning plate 65 is fixed with a connecting cylinder 67, the middle part of the connecting cylinder 67 is provided with a rotating shaft structure, and the bottom end of the rotating shaft is in engagement with the top end of the receiving structure 5, the mirror assembly 4 includes two groups of opposite light mirrors and a colorimetric cup arranged in the middle of the light mirror, and one side of the truss 2 is fixedly provided with a light splitting plate 3; the improved Michelson interferometer, the colorimetric cup and the double prism composite device are used to measure the refractive index of liquid under dynamic temperature. The traditional experiment needs to control the temperature in a constant interval, and then the refractive index is measured, which has the problems of large operation difficulty and low practicability. The combination of the colorimetric cup and the double prism can obtain the initial refractive index of the liquid solution and the change rate of the refractive index of the solution at different temperatures, and then the empirical formula of temperature and refractive index is obtained. The colorimetric cup and the double prism are combined to design a device that can measure the refractive index of the liquid and the temperature coefficient of the medium of the liquid. The device can realize the refractive index measurement of the liquid under dynamic temperature, and the MATLAB technology and the optical sensing technology are integrated into the experiment to replace the manual reading with the computer program, reduce the subjective error in measurement, and significantly improve the accuracy of the experimental measurement.

[0028] Threaded structures are formed on the outside of the two rotating rods 62 and the rotating shaft; rotating blocks 63 and rotating plates 66 are fixed to the outside of the rotating rods 62 and the rotating shaft, respectively; threaded grooves are formed in the top of the receiving structure 5 and the inside of the rotating drum 64; the rotating rods 62 and the rotating shaft are accurately read to 0.001 mm; the light splitting plate 3 is of an inclined structure; through the adjusting assembly 6 structure, the user can rotate the rotating block 63 structure to drive the rotating rod 62 to rotate, and then drive the mounting plate 61 and the receiving structure 5 to move forward and backward through the rotating drum 64, so as to adjust the width distance, and the connecting cylinder 67 can drive the rotating shaft 64 to rotate through the rotating plate 66, drive the receiving structure 5 at the bottom to adjust the height, and cooperate with the vertical arrangement structure to change the light path direction through the adjusting assembly 6 of the instrument, so that the experiment is better performed.

[0029] As Figures 4-5As shown in the schematic diagram, the improved Michelson interferometer consists of four main components: light source S, beam splitter G1, reflectors M1M2, and a cuvette and biprism assembly for liquid. The liquid container is mounted on a transverse transmission mechanism and driven by a spiral drum to achieve nanometer-level lateral movement and precise refractive index measurement. The light beam from light source S is split into two paths by beam splitter G1. After reflection, the light beam is coherently superimposed on the receiving screen, forming alternating light and dark interference ring fringes. This is recorded via video and then imported into a MATLAB program to read the number of fringes and the lateral movement distance for refractive index calculation.

[0030] First, the refractive index of the composite device is measured , the refractive index of air is approximately 1, since the optical path difference satisfies:

[0031] Where n1 is the number of fringes emerging (sinking) from the center of the observation screen, is the wavelength of the HeNe laser used. Therefore, the refractive index of the composite device is:

[0032]

[0033] The distance d that the light beam travels in the composite device can be given by the following formula:

[0034]

[0035] in is the distance the composite device moves laterally, is the wedge angle of the double prism. Fill the composite device with the liquid to be tested and ensure that the upper surface of the composite device is in complete contact with the flat glass surface without any bubbles.

[0036] In this configuration, the refractive index of the liquid to be measured is expression.

[0037]

[0038] According to equation (4), by measuring and averaging the lateral movement distances on both sides of the double wedge, the measurement deviation caused by the incomplete parallelism of the wedge angles can be effectively eliminated. And thanks to the unique structure of the double air wedge, there is no need to measure the wedge angles on both sides of the double air wedge independently. Only the double prism wedge angle needs to be determined. This can be used to obtain the initial liquid refractive index, and then the optical path is moved to the point where there is no wedge in the composite device, such as Figure TwoThe interference fringes can be observed in the light screen. When the composite device is filled with the liquid to be measured, the liquid is heated by the heating lamp, and after reaching a certain temperature, the temperature is naturally cooled. During the cooling process, the refractive index of the liquid changes with the change of the temperature, so that the optical path of the light through the container changes. At this time, the number of changes of the interference fringes can describe the change of the optical path. Assuming that the refractive index of the liquid changes by△n after the temperature of the liquid decreases by 1℃. Since the light passes through the entire container during the entire process, the optical path difference can be represented as:

[0039]

[0040] where N is the number of interference fringes per 1℃ decrease, is the height of the light passing through the container, is the wavelength of the helium-neon laser. Thus, the relative change rate can be obtained as:

[0041]

[0042] The corresponding fitting formula can be obtained by combining the above formulae:

[0043]

[0044] where, represents the refractive index of the liquid corresponding to t0, is the refractive index of the liquid corresponding to different temperatures, is the temperature coefficient of the medium.

[0045] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents. These modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A new Michelson thermal refractive index measuring interferometer, characterized in that: The invention comprises a mounting platform (1); four groups of trusses (2) are fixed on the top of the mounting platform (1); a reflector assembly (4) is fixed on the top of the trusses (2); an adjustment assembly (6) is fixed on one side of the trusses (2); a receiving structure (5) is fixed on one side of the adjustment assembly (6); the adjustment assembly (6) comprises a mounting plate (61), a rotating rod (62) arranged on both sides of the mounting plate (61) and a positioning plate (65) sleeved on the outside of the rotating rod (62); a groove structure is provided on both sides of the mounting plate (61), and the rotating rod ( 62) is inserted into the slot structure, the outer side of the rotating rod (62) is provided with a rotating cylinder (64), the rotating cylinder (64) is fixed to the bottom of the positioning plates (65) on both sides, the outer side of the positioning plates (65) is fixed with a connecting cylinder (67), the middle part of the connecting cylinder (67) is provided with a rotating shaft structure, and the bottom end of the rotating shaft is kept in meshing contact with the top end of the receiving structure (5), the reflector assembly (4) includes two groups of oppositely arranged reflectors and a cuvette arranged in the middle of the reflector, and a beam splitter (3) is fixedly provided on one side of the truss (2).

2. A novel Michelson thermal refractive index measuring interferometer according to claim 1, characterized in that: The outer sides of the two groups of rotating rods (62) and the rotating shaft are both provided with thread structures.

3. A novel Michelson thermal refractive index measuring interferometer according to claim 1, characterized in that: A rotating block (63) and a rotating plate (66) are fixed to the outer sides of the rotating rod (62) and the rotating shaft respectively.

4. A novel Michelson thermal refractive index measuring interferometer according to claim 1, characterized in that: The top end of the receiving structure (5) and the inside of the rotating cylinder (64) are provided with thread grooves.

5. A novel Michelson thermal refractive index measuring interferometer according to claim 4, characterized in that: The minimum graduation of the rotating rod (62) and the rotating shaft is 0.001 mm.

6. A novel Michelson thermal refractive index measuring interferometer according to claim 1, characterized in that: The light splitter plate (3) is an inclined structure.

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