Mechanical glass refractive index measuring instrument

Abstract

The utility model discloses a mechanical glass refractive index measuring instrument, include: base, stripe plate, stripe plate is located on the base, and stripe plate is equipped with a plurality of stripes of equal interval arrangement, rotating mechanism, rotating mechanism includes the shell, reduction gear set and main scale bar, reduction gear set is located in the shell, and the output of reduction gear set is worn in the one side of shell, and is parallel with stripe, and the input of reduction gear set is worn in the other side of shell, and is connected with knob, scale bar is located in the shell along the rotation direction, glass frame, glass frame is located above stripe plate, and is connected in the output of reduction gear set, top support board, top support board is located on the base, and top support board is equipped with the observation port, and the observation port is located stripe plate. Mechanical glass refractive index measuring instrument utilizes the pure mechanical device of optical principle measurement, has the advantage that need not power support, and the cost is low, and can accurately measure the conventional thickness glass.

Description

Technical Field

[0001] This application relates to the field of measuring the optical properties of flat glass, specifically to a mechanical glass refractive index measuring instrument. Background Technology

[0002] Refractive index is a crucial parameter for glass products, especially optical glass, and is widely used in optical design and optical material research. In float glass production, refractive index not only reflects the uniformity of the glass's chemical composition but also directly affects its light transmittance, reflection characteristics, and the quality of subsequent deep processing. Refractive index is of great significance for glass quality control and product performance research. Real-time measurement of the glass's refractive index allows for the assessment of the uniformity and stability of the glass composition, thereby analyzing the raw material ratio and melting process. The refractive index directly reflects the optical properties of float glass products, and different refractive index standards are often used for float glass products with different applications.

[0003] Currently, the methods for measuring the refractive index of glass typically involve using equipment such as Abbe refractometers and laser interferometers. Although these methods can measure the refractive index very accurately, the equipment used is expensive, maintenance costs are high, and they rely on power support.

[0004] In physics experiment teaching, the pin method is usually used to measure the refractive index of glass. However, this method is only suitable for thick glass blocks. For float glass of common thickness, the refractive index measured by this method has a large error. Utility Model Content

[0005] Therefore, a mechanical glass refractive index measuring instrument is needed to solve the problems of high cost, inconvenience of use, and inability of the pin method to accurately measure glass of conventional thickness in existing refractive index measuring equipment.

[0006] To achieve the above objectives, the inventors provide a mechanical glass refractive index measuring instrument, comprising:

[0007] Base;

[0008] A striped plate, wherein the striped plate is disposed on a base and has a plurality of stripes arranged at equal intervals;

[0009] A rotating mechanism, comprising a housing, a reduction gear set, and a main scale bar; the reduction gear set is disposed inside the housing, with its output end extending through one side of the housing and parallel to the scale bar, and its input end extending through the other side of the housing and connected to a knob; the scale bar is disposed on the housing along the direction of rotation.

[0010] A glass holder, which is positioned above the striped plate and connected to the output end of the reduction gear set;

[0011] A top support plate is provided on the base, and the top support plate is provided with an observation port located on the striped plate.

[0012] In some embodiments, the rotating mechanism further includes a secondary scale bar, which is located at the knob along the direction of rotation.

[0013] In some embodiments, the reduction gear set is a planetary gear.

[0014] In some embodiments, the planetary gear is a multi-stage planetary gear.

[0015] In some embodiments, the striped plate is detachably mounted on the base; there are a plurality of striped plates, and the stripe spacing of the plurality of striped plates is different.

[0016] In some embodiments, the base has an embedding groove, and the striped plate is detachably embedded in the embedding groove.

[0017] In some embodiments, the base is provided with a clearance groove, the output end of the reduction gear set is located in the clearance groove and connected to the side of the glass frame, and when the glass frame is in the constant state, the glass frame rests horizontally on the striped plate.

[0018] In some embodiments, the glass holder has a limiting groove for placing a glass plate, and the bottom of the limiting groove is hollowed out.

[0019] In some embodiments, the top support plate is further provided with a light source hole for projecting a light source.

[0020] In some embodiments, the top support plate is mounted on the base via a bracket, the bracket being provided with a track, and the top support plate is slidably mounted on the track.

[0021] Unlike existing technologies, the mechanical glass refractive index measuring instrument described in the above technical solution uses a glass holder to place the glass sample to be tested on a striped plate. Light is refracted in the glass sample and exits from the downward-facing side of the glass sample in a direction parallel to the incident light, resulting in a certain amount of offset between the incident and refracted light. By rotating a knob, the reduction gear set is rotated to precisely and slowly drive the glass holder to rotate, thereby adjusting the angle of the glass sample relative to the striped plate. The glass sample is gradually rotated from its initial horizontal position. At the same time, it is observed through the observation port of the top support plate until the virtual image of a certain stripe observed through the glass sample coincides with the adjacent stripe on the striped plate. At this point, the light offset is equal to the stripe spacing. By reading the main scale bar, the angle of incidence can be obtained, and thus the relationship between the light offset, the angle of incidence, and the thickness of the glass sample can be obtained. Using the law of refraction, that is, the refractive index of a material is equal to the ratio of the sine of the angle of incidence to the sine of the angle of refraction, the refractive index can finally be obtained. The mechanical glass refractive index measuring instrument is a purely mechanical device that uses simple optical principles to measure the refractive index of glass. It requires no power support, is inexpensive, and easy to use. It controls the glass frame to rotate through a reduction gear set, and can accurately measure glass of normal thickness. The overall structure is compact and easy to carry.

[0022] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0023] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0024] In the accompanying drawings of the instruction manual:

[0025] Figure 1 This is a left-angled structural diagram of the mechanical glass refractive index measuring instrument described in a specific embodiment;

[0026] Figure 2 This is a right-angled structural diagram of the mechanical glass refractive index measuring instrument described in a specific embodiment;

[0027] Figure 3 This is a structural diagram of the glass frame described in a specific embodiment;

[0028] Figure 4 This is a structural diagram of the rotating mechanism described in a specific embodiment;

[0029] Figure 5This is a structural diagram of the multi-stage planetary gear described in a specific embodiment;

[0030] Figure 6 This is a structural diagram of the base described in a specific embodiment;

[0031] Figure 7 This is a schematic diagram illustrating the measurement principle of the mechanical glass refractive index measuring instrument described in a specific embodiment.

[0032] The reference numerals used in the above figures are explained as follows:

[0033] 1. Base;

[0034] 100. Embedded slot; 101. Leaving slot;

[0035] 2. Striped plate;

[0036] 3. Outer shell;

[0037] 4. Main scale bar;

[0038] 5. Multi-stage planetary gears;

[0039] 500. Sun gear; 501. Planet gears; 502. Ring gear; 503. Planet carrier; 504. Output end; 505. Input end; 506. Knob;

[0040] 6. Glass shelf;

[0041] 600, limiting groove; 601, shaft hole;

[0042] 7. Top support plate;

[0043] 700, Observation port; 701, Light source hole;

[0044] 8. Secondary graduation bar;

[0045] 9. Bracket;

[0046] 900, track;

[0047] 10. Glass sample. Detailed Implementation

[0048] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0049] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0050] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0051] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0052] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0053] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0054] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0055] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0057] Refractive index is a crucial parameter for glass products, especially optical glass, and is widely used in optical design and optical material research. In float glass production, refractive index not only reflects the uniformity of the glass's chemical composition but also directly affects its light transmittance, reflection characteristics, and the quality of subsequent deep processing. Refractive index is of great significance for glass quality control and product performance research. Real-time measurement of the glass's refractive index allows for the assessment of the uniformity and stability of the glass composition, thereby analyzing the raw material ratio and melting process. The refractive index directly reflects the optical properties of float glass products, and different refractive index standards are often used for float glass products with different applications.

[0058] Currently, the methods for measuring the refractive index of glass typically involve using equipment such as Abbe refractometers and laser interferometers. Although these methods can measure the refractive index very accurately, the equipment used is expensive, maintenance costs are high, and they rely on power support.

[0059] In physics experiment teaching, the pin method is usually used to measure the refractive index of glass. However, this method is only suitable for thick glass blocks. For float glass of common thickness, the refractive index measured by this method has a large error.

[0060] Therefore, this utility model provides a mechanical glass refractive index measuring instrument for measuring the refractive index of glass, especially for measuring glass samples of conventional thickness, such as float glass. It is a purely mechanical device that uses simple optical principles to measure the refractive index of glass. It requires no power support, is easy to use, has low cost, high accuracy, and is portable.

[0061] Please see Figure 1 or Figure 2 In a specific embodiment, the mechanical glass refractive index measuring instrument includes a base 1, a stripe plate 2, a rotating mechanism, a glass holder 6, and a top support plate 7. The base 1 serves as a measuring platform for placing the stripe plate 2, the rotating mechanism, the glass holder 6, and the top support plate 7. The stripe plate 2 provides a relative object for measurement and a basis for comparison. The rotating mechanism is operated by the user to rotate the glass holder 6, and it has a deceleration effect, serving as a power transmission and deceleration system, thereby allowing for more precise adjustment of the rotation angle of the glass sample 10. The glass holder 6 supports the glass sample 10 to be tested, positioning it above the stripe plate 2, and allowing it to rotate relative to the stripe plate 2. (See also...) Figure 3 The glass holder 6 is designed with a perforation so that light can pass through the glass sample 10 and the glass holder 6 and reach the striped plate 2. The user can see the striped plate 2 through the glass.

[0062] The striped plate 2 is mounted on the base 1 and has several stripes spaced at equal intervals. The rotating mechanism includes a housing 3, a reduction gear set, and a main scale bar 4. The reduction gear set is located inside the housing 3, with its output end 504 extending through one side of the housing 3 and parallel to the stripes. The input end 505 extends through the other side of the housing 3 and is connected to a knob 506. By rotating the knob 506, the user rotates the input end 505 of the reduction gear set, thereby causing the reduction gear set to rotate sequentially. The output end 504 of the reduction gear set drives the glass holder 6 to flip, thus achieving the flipping of the glass sample 10. The scale bar rotates along the... The rotation direction is located at the outer shell 3, and the scale bar is an angle scale bar. After flipping the glass frame 6, the flipping angle of the glass frame 6 can be obtained by reading the value on the scale bar. The glass frame 6 is located above the striped plate 2 and is connected to the output end 504 of the reduction gear set. The top support plate 7 is located on the base 1 and has an observation port 700. The observation port 700 is located on the striped plate 2 and can be observed directly with the naked eye or with the aid of an observation device. The top support plate 7 is used to support the observation device, such as a mobile phone placed on the top support plate 7. The mobile phone's camera is aimed at the observation port 700 to observe and record the timing of relevant operation nodes.

[0063] The mechanical glass refractive index measuring instrument uses a glass holder 6 to mount the glass sample 10 on the striped plate 2. Light is refracted in the glass sample 10 and exits from the downward-facing side of the glass sample 10 in a direction parallel to the incident light, resulting in a certain amount of offset between the incident and refracted light. By rotating the knob 506, the reduction gear set is rotated to precisely and slowly drive the glass holder 6 to rotate, thereby adjusting the angle of the glass sample 10 relative to the striped plate 2. The glass sample 10 is gradually rotated from its initial horizontal position. At the same time, it is observed through the observation port 700 of the top support plate 7 until the virtual image of a certain stripe observed through the glass sample 10 coincides with the adjacent stripe on the striped plate 2. At this point, the light offset is equal to the stripe spacing. The incident angle can be obtained by reading the main scale bar 4, and then the relationship between the light offset, the incident angle, and the thickness of the glass sample 10 can be obtained. Using the law of refraction, that is, the refractive index of a material is equal to the ratio of the sine of the incident angle to the sine of the refracted angle, the refractive index can finally be obtained. The mechanical glass refractive index measuring instrument is a purely mechanical device that uses simple optical principles to measure the refractive index of glass. It requires no power support, is inexpensive, and easy to use. The glass frame 6 is rotated by a reduction gear set, which can accurately measure glass of normal thickness. The overall structure is compact and easy to carry.

[0064] The specific parameter requirements for the glass sample of this utility model include: length not exceeding 95mm, 90mm is suitable; width not exceeding 80mm, 75mm is suitable; thickness not exceeding 15mm, thickness is measured using a micrometer; and the boundary is rectangular with straight edges.

[0065] In some embodiments, the glass holder 6 is provided with a shaft hole 601, and the output end is engaged in the shaft hole 601.

[0066] Please see Figure 3 In some embodiments, the glass holder 6 has a limiting groove 600 for placing a glass plate. The glass sample 10 is placed in the limiting groove 600, restricting the movement of the glass sample 10 to prevent it from falling off during the flipping of the glass holder 6. The bottom of the limiting groove 600 is hollowed out, allowing light to pass through the glass sample 10 and the glass holder 6 to reach the striped plate 2, so that the user can see the striped plate 2 through the glass plate.

[0067] Please see Figure 4 In some embodiments, the rotating mechanism further includes a secondary scale bar 8, which is located at the knob 506 along the rotation direction.

[0068] The main scale bar 4 has a large range of graduations, while the secondary scale bar 8 has a small range of graduations. For example, the main scale bar 4 has a graduation of 0°-90°, while the secondary scale bar 8 has a graduation of 0°-2.5°. By first rotating the knob 506 in a large range to read and record the value of the main scale bar 4, and then rotating the knob 506 in a small range to read the value of the secondary scale bar 8, the rotation angle can be obtained more accurately.

[0069] In some embodiments, the reduction gear set is a planetary gear.

[0070] In some embodiments, the planetary gear is a multi-stage planetary gear 5, which is used to reduce speed and achieve precise rotational angle control. The internal structure and transmission ratio of the multi-stage planetary gear 5 can be adjusted according to the measurement accuracy requirements.

[0071] In some embodiments, the multi-stage planetary gear 5 is a three-stage planetary gear.

[0072] like Figure 5 As shown, the three-stage planetary gear includes a sun gear 500, planet gears 501, a ring gear 502, a planet carrier 503, an output end 504, and an input end 505. The planet gears 501 are located on the planet carrier 503 and mesh with the sun gear 500. The ring gear 502 meshes with each of the planet gears 501. The input end 505 is connected to the axis of the sun gear 500, and the output end 504 is connected to the axis of the ring gear 502. The rotation of the input end 505 drives the sun gear 500 to rotate, which in turn drives the planet gears 501 to rotate, which in turn drives the ring gear 502 to rotate, and finally drives the output end 504 to rotate.

[0073] A knob 506 with a secondary scale bar 8 is used as the direct power input end 505. The power is reduced by a three-stage planetary gear transmission with a transmission ratio of 120:1. The output end 504 is connected to a glass holder 6 that can rotate around the axis, so as to achieve precise rotation angle control and improve the measurement accuracy of the device.

[0074] In some embodiments, the striped plate 2 is detachably mounted on the base 1; there are a plurality of striped plates 2, and the stripe spacing of the plurality of striped plates 2 is different, so that striped plates 2 with different stripe spacing can be replaced according to different needs.

[0075] In some embodiments, the stripe spacing of the stripe plate 2 can be 1mm-6mm. For example, stripe plates 2 with stripe spacing of 1mm, 2mm, 3mm, 4mm, 5mm, and 6mm can be provided to meet the measurement needs of glass samples 10 with different thicknesses.

[0076] Please see Figure 6In some embodiments, the base 1 has an embedding groove 100, and the striped plate 2 is detachably embedded in the embedding groove 100, so that the striped plate 2 can be quickly removed or installed.

[0077] In a further embodiment, a handle is provided on one side of the striped plate 2, which can be easily removed from the embedding groove 100.

[0078] In some embodiments, the base 1 is provided with a clearance groove 101, the output end 504 of the reduction gear set is located in the clearance groove 101 and connected to the side of the glass frame 6, and when the glass frame 6 is in the constant state, the glass frame 6 rests horizontally on the striped plate 2.

[0079] Please see Figure 6 In a further embodiment, the shape of the relief groove 101 is adapted to the entire rotating mechanism, and the outer shell 3 is also located within the relief groove 101.

[0080] In some embodiments, the top support plate 7 is also provided with a light source hole 701 for projecting a light source. When there is insufficient light, a light source can be added and projected from the light source hole 701. For example, an LED light assembly can be used as a supplementary light fixture in cases of poor lighting conditions.

[0081] In some embodiments, the top support plate 7 is mounted on the base 1 via a bracket 9. The bracket 9 is provided with a track 900, and the top support plate 7 is slidably mounted on the track. The user can adjust the position of the top support plate 7 as needed, thereby adjusting the position of the observation hole.

[0082] like Figure 7 As shown, the working principle of this invention is based on the law of refraction, which states that the refractive index of a substance is equal to the ratio of the sine of the angle of incidence to the sine of the angle of refraction.

[0083]

[0084] like Figure 7 As shown, light is refracted in the glass sample 10 and exits from the other side of the glass sample 10 in a direction parallel to the incident light, resulting in a certain amount of deflection between the incident and refracted light. A striped plate 2 is placed below the glass sample 10. The glass sample 10 is gradually rotated from its initial horizontal position until the virtual image of a certain stripe observed through the observation hole coincides with the adjacent stripe on the striped plate 2. At this point, the amount of light deflection is equal to the stripe spacing.

[0085] The relationship between the light ray deflection Δx, the incident angle α, and the glass thickness d can be obtained through calculation:

[0086]

[0087] By combining the two formulas, we can derive the formula for calculating the refractive index:

[0088]

[0089] Excel software can be used to quickly perform a large number of refractive index calculations.

[0090] This invention is easy to use. A stripe plate 2 with a suitable stripe spacing (generally 30%-50% of the thickness of the glass sample 10) is selected and placed in the embedding groove 100 on the base 1. A rectangular glass sample 10 of suitable size (90±5mm long, 75±5mm wide, thickness measured with a micrometer) is placed on the glass holder 6, ensuring that both sides of the glass sample 10 are parallel and without obvious deformation, the stripe direction is perpendicular to the glass boundary, and a portion of the stripe plate is exposed outside the glass refraction zone.

[0091] Place the observation device, such as a mobile phone, on the top support plate 7, and observe through the observation hole of the observation plate. Move the top support plate 7 so that the intersection of the boundary of the glass sample 10 and the stripe to be observed is located in the center of the observation field. The magnification of the observation device can be adjusted appropriately. A lamp can be installed in case of insufficient light.

[0092] Rotate knob 506 to raise the glass holder 6 containing glass sample 10 to a certain angle, and slowly rotate it back until the rotating disk just stops changing angle. At this time, mark the position of the 0 mark on the sub-scale bar 8 of knob 506 on the outer casing 3 with an erasable pen.

[0093] Rotate knob 506 to slowly rotate glass holder 6 and observe through observation hole until the virtual images of adjacent stripes approach and overlap with the target stripe, then stop rotating knob 506.

[0094] At this time, the scale corresponding to the bottom surface of the glass holder 6 and the main scale bar is the coarse measurement value, and the scale corresponding to the mark on the knob 506 is the fine measurement value. The sum of the two is the incident angle α.

[0095] Enter the data into an Excel spreadsheet for quick calculation to obtain the refractive index.

[0096] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A mechanical glass refractive index measuring instrument, characterized in that, include: Base; A striped plate, wherein the striped plate is disposed on a base and has a plurality of stripes arranged at equal intervals; A rotating mechanism, comprising a housing, a reduction gear set, and a main scale bar; the reduction gear set is disposed inside the housing, with its output end extending through one side of the housing and parallel to the scale bar, and its input end extending through the other side of the housing and connected to a knob; the scale bar is disposed on the housing along the direction of rotation. A glass holder, which is positioned above the striped plate and connected to the output end of the reduction gear set; A top support plate is provided on the base, and the top support plate is provided with an observation port located on the striped plate.

2. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The rotating mechanism also includes a secondary scale bar, which is located at the knob along the direction of rotation.

3. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The reduction gear set is a planetary gear.

4. The mechanical glass refractive index measuring instrument according to claim 3, characterized in that, The planetary gear is a multi-stage planetary gear.

5. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The striped plate is detachably mounted on the base; there are several striped plates, and the stripe spacing of the several striped plates is different.

6. The mechanical glass refractive index measuring instrument according to claim 5, characterized in that, The base has an embedding groove, and the striped plate is detachably embedded in the embedding groove.

7. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The base is provided with a clearance groove, the output end of the reduction gear set is located in the clearance groove and connected to the side of the glass frame. When the glass frame is in the constant state, the glass frame rests horizontally on the striped plate.

8. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The glass holder has a limiting groove for placing the glass plate, and the bottom of the limiting groove is hollowed out.

9. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The top support plate is also provided with a light source hole for projecting a light source.

10. The mechanical glass refractive index measuring instrument according to claim 1, characterized in that, The top support plate is mounted on the base via a bracket, the bracket being equipped with a track, and the top support plate is slidably mounted on the track.

Images