Glass stress measuring device and optical element
By setting a support on the surface of the prism to control the gap between the prism and glass and filling the refractive index liquid, the light loss and sliding problems caused by the gap between the prism and glass are solved, and a more accurate measurement of the stress distribution of the glass is achieved.
Patent Information
- Application Number
- CN202410130090.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-08-01
AI Technical Summary
Prior art When measuring glass stress, the gap between the prism and glass causes a large difference in air refractive index, affecting light loss and may cause relative sliding of the glass, resulting in inaccurate measurement.
A support is provided on the surface of the prism to control the height of the gap between the prism and glass, fill the matching refractive index liquid, avoid the presence of air and limit the sliding of the liquid.
The refractive index deviation between the laser passing through the medium is reduced, the light loss is reduced, and the testing accuracy and accuracy of the glass stress distribution are improved.
Smart Images
Figure CN120403931A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of glass detection, and particularly to a stress measurement device and an optical element for glass. Background Art ]
[0002] High-purity and high-quality glass can be applied to lenses, screens, optical lenses, etc. However, for optical glass, internal stress needs to be controlled, such as through processes like precision annealing. For glass such as architectural glass, automotive glass, and mobile phone covers, strength needs to be improved, and stress detection is more widely applied in this direction. Pre-stress is used to increase the strength of glass. Currently, there are two ways to generate pre-stress: physical tempering and chemical tempering. To quantify the strength of glass, it is necessary to measure the surface stress and stress distribution of the glass.
[0003] Currently, there are two principles for measuring surface stress. The first is the optical waveguide method. Usually, after glass is tempered, the surface is a compressive stress layer with a high refractive index, while the core layer has a low refractive index, forming an optical waveguide layer. The TM and TE lights with two perpendicular vibration directions have different guided mode refractive indices in this optical waveguide layer. The guided mode refractive index reflects the refractive index of the surface layer. The ratio of the refractive index difference between TM and TE to the photoelastic coefficient is equal to the stress value. Typical applications are differential surface refraction method and surface grazing angle polarization method.
[0004] The second is the laser scattering method. Laser undergoes Rayleigh scattering with sample molecules inside the sample. The phase of the scattered light of TM light on the optical path is the same as the phase of TM light at the scattering point, and the scattered light intensity changes with the observation angle; the phase of the scattered light of TE light on the optical path is the same as the phase of TE light at the scattering point, and the scattered light intensity changes with the observation angle. The TM and TE scattered lights interfere destructively and constructively due to the phase difference in the plane perpendicular to the observation angle, and thus the light intensity changes between bright and dark can be seen on the light propagation path. By modulating the phase difference between the incident laser TM and TE, the light intensity change at a specified scattering point under different incident laser phase differences can be obtained, and the phase difference between TM and TE at this point can be calculated.
[0005] However, when the detection light passes through the interface, the factor with a great influence is the gap part between the prism and the glass. The refractive index of air is 1, the refractive indices of the prism and the sample to be measured are 1.5 and above, and the refractive index matching liquid is close to the prism and the sample. Without the matching liquid, the reflected light intensity is too high; if the incident angle is large, total reflection will occur at the prism gap interface, and the detection light cannot enter the sample. Therefore, it is necessary to fill a refractive index liquid between the prism and the glass. However, if the refractive index liquid is directly filled into the gap between the prism and the glass, relative sliding will occur between the glass and the matching liquid, affecting the test. Summary of the Invention
[0006] The present application provides a stress measurement device for glass and an optical element. By providing a support member on the surface of the prism, a refractive index liquid that matches can be provided between the prism and the glass to be measured, expelling air, reducing the refractive index deviation of the laser passing through the three media, reducing the light loss caused by the interface, and avoiding the problem of inaccurate measurement caused by the relative sliding of the glass to be measured during measurement due to the refractive index matching liquid.
[0007] In a first aspect, a stress measurement device for glass is provided, including a light emitting unit, an optical element, a collection unit, and a processing unit, where: the light emitting unit is used to emit a laser; the optical element includes a first surface and a second surface, the laser emission direction of the light emitting unit faces the first surface, and the second surface is in contact with the glass to be measured. Among them, the first surface is the incident surface of the laser, and the second surface is the exit surface of the laser; the collection unit is used to collect scattered light and process the scattered light into a data signal, and the scattered light is formed by the interference generated after the laser is incident on the glass to be measured; the processing unit is used to determine the stress distribution in the glass to be measured according to the data signal; where multiple support members are provided on the second surface, and the height of the support members corresponds to a first thickness, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be measured and the second surface.
[0008] In the above stress measurement device, by providing a support member on the surface of the prism, a refractive index liquid that matches can be provided between the prism and the glass to be measured, expelling air, reducing the refractive index deviation of the laser passing through the three media, reducing the light loss caused by the interface, and avoiding the problem of inaccurate measurement caused by the relative sliding of the glass to be measured during measurement due to the refractive index matching liquid.
[0009] Combined with the first aspect, in some implementation manners of the first aspect, multiple support members are provided outside the coverage area of the laser and / or the scattered light on the second surface. Thus, the setting of the support members will not affect the coupling of the laser and / or the subsequent collection of the scattered light, avoiding the light loss caused by the setting of the support members.
[0010] Combined with the first aspect, in some implementation manners of the first aspect, multiple support members are arranged around the coverage area. Thus, the setting of the support members will not affect the coupling of the laser and / or the subsequent collection of the scattered light, avoiding the light loss caused by the setting of the support members.
[0011] Combined with the first aspect, in some implementation manners of the first aspect, the optical element is composed of a first prism and a second prism. The first prism includes an inclined surface, and the second prism is a flat plate structure. Among them, the first surface is located on the first prism, the second surface is located on the second prism, and multiple support members are provided in a first area of the second surface, and the first area is the area outside the projection of the first prism on the second surface. Thus, the setting of the support members will not affect the coupling of the laser and / or the subsequent collection of the scattered light, avoiding the light loss caused by the setting of the support members.
[0012] In combination with the first aspect, in some implementations of the first aspect, the number of multiple support members is greater than or equal to 3. Thus, the gap height between the optical element and the glass to be measured is better guaranteed, avoiding relative movement between the optical element and the glass to be measured caused by the filling of the refractive index liquid, and preventing problems from occurring in the test.
[0013] In combination with the first aspect, in some implementations of the first aspect, the support member has an anti-slip mechanism. Thus, relative movement between the optical element and the glass to be measured caused by the filling of the refractive index liquid is avoided, improving the accuracy of the test result of the glass stress distribution.
[0014] In combination with the first aspect, in some implementations of the first aspect, the anti-slip mechanism includes a top surface after being frosted. Thus, the frictional force between the optical element and the glass to be measured is increased.
[0015] In combination with the first aspect, in some implementations of the first aspect, the support member is any one of a hemispherical shape, a cylindrical shape, or a conical shape. In some implementations, the support member is cylindrical, thereby increasing the contact area with the glass to be measured. In some implementations, the support member is hemispherical, thereby enabling the support member to contact the glass to be measured faster.
[0016] In combination with the first aspect, in some implementations of the first aspect, the support member is made of a transparent material. Thus, the influence of the setting of the support member on the test is weakened.
[0017] In a second aspect, an optical element is provided for use in a stress measurement device for glass. The device includes a light emitting unit, an optical element, a collection unit, and a processing unit. Among them, the light emitting unit is used to emit laser light, the collection unit is used to collect the scattered light generated after the laser light is incident on the glass to be measured, and process the scattered light into a data signal. The processing unit is used to determine the stress distribution in the glass to be measured according to the data signal. The scattered light is formed by the interference generated after the laser light is incident on the glass to be measured. Among them: The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit faces the first surface, and the second surface is in contact with the glass to be measured. Among them, the first surface is the incident surface of the laser light, and the second surface is the exit surface of the laser light; Among them, a plurality of support members are arranged on the second surface, and the height of the support member corresponds to the first thickness, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be measured and the second surface.
[0018] By arranging support members on the prism surface, a refractive index liquid that matches can be set between the prism and the glass to be measured, expelling air, reducing the refractive index deviation of the laser light passing through the three media, reducing the light loss caused by the interface, and at the same time avoiding the problem of inaccurate measurement caused by the relative sliding of the glass to be measured during measurement due to the refractive index matching liquid. Description of the Drawings
[0019] Figure 1 It is a schematic diagram of a stress measurement device for glass provided by an embodiment of the present application.
[0020] Figure 2 It is a schematic diagram of an optical element provided by an embodiment of the present application. Detailed implementation manners
[0021] Next, the technical solutions in the present application will be described in conjunction with the accompanying drawings.
[0022] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.
[0023] The reference to "one embodiment" or "some embodiments" etc. described in this specification means that a specific feature, structure, or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0024] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", etc. is defined relative to the orientation or position of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, rather than indicating or implying that the indicated device or component must have a specific orientation, or be constructed and operated in a specific orientation. It can change accordingly with the change of the orientation of the components placed in the accompanying drawings. Therefore, it cannot be construed as a limitation to the present application.
[0025] The terms "include" and "have" and any variants thereof shown hereinafter in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.
[0026] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Embodiments or design solutions described as "exemplary" or "for example" should not be construed as being more preferred or having more advantages than other embodiments or design solutions. The use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner for easy understanding.
[0027] High-purity and high-quality glass can be applied to lenses, screens, optical lenses, etc. However, for optical glass, internal stress needs to be controlled, such as through processes like precision annealing. For glass such as architectural glass, automotive glass, and mobile phone covers, strength needs to be improved, and stress detection is more applied in this direction. Prestress is used to increase the strength of glass. Currently, there are two ways to generate prestress: physical tempering and chemical tempering. To quantify the strength of glass, it is necessary to measure the surface stress and stress distribution of the glass.
[0028] Currently, there are two principles for measuring surface stress. The first is the optical waveguide method. Usually, after glass tempering, the surface is a compressive stress layer with a high refractive index, and the core layer has a low refractive index, which can form an optical waveguide layer. The TM and TE lights with two perpendicular vibration directions have different guided-mode refractive indices in this optical waveguide layer. The guided-mode refractive index reflects the refractive index of the surface layer. The ratio of the refractive index difference between TM and TE to the photoelastic coefficient is equal to the stress value. Typical applications are differential surface refraction method and surface grazing angle polarization method.
[0029] The second is the laser scattering method. Laser undergoes Rayleigh scattering with sample molecules within the sample. The phase of the scattered light of TM light on the optical path is the same as the phase of TM light at the scattering point, and the scattered light intensity changes with the observation angle; the phase of the scattered light of TE light on the optical path is the same as the phase of TE light at the scattering point, and the scattered light intensity changes with the observation angle. The TM and TE scattered lights interfere constructively and destructively due to the phase difference in a plane perpendicular to the observation angle, and thus the light intensity changes between bright and dark can be seen on the propagation path of the light. By modulating the phase difference between the incident laser TM and TE, the light intensity changes at a specified scattering point under different incident laser phase differences can be obtained, and the phase difference between TM and TE at this point can be calculated.
[0030] However, when detecting light passes through the interface, the factor with a large influence is the gap part between the prism and the glass. The refractive index of air is 1, the refractive indices of the prism and the sample to be measured are 1.5 and above, and the refractive index matching liquid is close to the prism and the sample. Without the matching liquid, the reflected light intensity is too high; if the incident angle is large, total internal reflection will occur at the prism gap interface, and the detection light cannot enter the sample. Therefore, it is necessary to fill a refractive index liquid between the prism and the glass. However, if the refractive index liquid is directly filled into the gap between the prism and the glass, relative sliding will occur between the glass and the matching liquid, affecting the test.
[0031] In view of this, the embodiments of the present application provide a stress measurement device and an optical element for glass. By arranging a support on the surface of the prism and controlling the gap height between the prism and the glass to be measured, a refractive index liquid that matches can be set between the prism and the glass to be measured, improving the accuracy of the test result of the glass stress distribution while avoiding the problem of inaccurate measurement caused by the relative sliding of the glass to be measured during measurement due to the refractive index matching liquid.
[0032] Figure 1 FIG. is a schematic diagram of a stress measurement device for glass provided by the embodiments of the present application. As Figure 1 shown, the device includes a light emission unit, an optical element, a collection unit 140, and a processing unit (not shown in the figure).
[0033] Among them, the light emission unit is used to emit laser light. The light emission unit may specifically include a laser emitter 111 and a polarization control element 112. Among them, the laser may include two mutually perpendicular polarization light components. It should be understood that the polarization control element 112 in the figure is only a schematic drawing, and the specific polarization control element may specifically include a polarizer, a phase controller, etc., which are determined according to the actual situation.
[0034] The optical element may specifically refer to a prism, and this optical element is used to couple the laser to the glass 130 to be measured. The optical element includes a first surface 121 and a second surface 122. The laser emission direction of the light emission unit 110 faces the first surface 121, and the second surface 122 is in contact with the glass 130 to be measured.
[0035] Among them, the first surface 121 is the incident surface of the laser, and the second surface 122 is the exit surface of the laser. Among them, a plurality of support members 123 are arranged on the second surface 122, and the height of the support members corresponds to the first thickness, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be measured and the second surface 122. It should be understood that Figure 1 FIG. (a) specifically shows the situation where the optical element supports the glass 130 to be measured. In addition, as Figure 1 shown in FIG. (b), the optical element may also be located above the glass 130 to be measured. The specific setting situation of the support members 123 on the optical element is combined with the subsequent appendices Figure 2 .
[0036] The acquisition unit 140 is used to acquire scattered light and process the scattered light into a data signal. The acquisition unit 140 can be a camera, a light receiver, etc., which is determined according to the actual situation. In addition, the acquisition unit 140 may further include an image data processing circuit and a storage device. Alternatively, the acquisition unit 140 may further include a photoelectric conversion circuit, a data processing circuit, and a storage device. Among them, the scattered light is formed by the interference generated after the laser is incident on the glass 130 to be measured. Since the propagation speeds of the two polarized lights in the laser in the glass are different, an optical path difference will be generated. Therefore, the light intensity of the scattered light at each point on the glass is different, and scattered interference fringes with light and dark intervals will be generated.
[0037] In the cases of (a) and (b) as shown in Figure 1 , the second surface 122 is also the incident surface of the scattered light, and the third surface 123 can be the exit surface of the scattered light. The acquisition unit 140 can acquire the scattered light from the third surface 124. In the case shown in (c) as in Figure 1 , the acquisition unit 140 can acquire the scattered light from the side of the glass 130 to be measured away from the optical element.
[0038] The processing unit includes a processor, a reader, a memory, etc. The processing unit is used to determine the stress distribution in the glass to be measured according to the data signal. For example, the stress value of each point in the glass to be measured can be calculated according to the following formula:
[0039]
[0040] Among them, σ(s) is the stress value of each point in the glass to be measured, and the unit is MPa. C is the stress optical constant of the glass to be measured, and the unit is MPa -1 . Δ(s) is the optical path difference between the two polarized light components included in the laser on the glass to be measured, and the unit is nm. S is the propagation distance of light in the glass, and the unit is mm.
[0041] In addition, in this application, since the target thickness of the refractive index liquid to be filled between the optical element and the glass 130 to be measured corresponds to the height of the support 123, the processing unit can also substitute the specific refractive index and / or target thickness of the refractive index liquid into the calculation of the stress value of each point in the glass to be measured. For example, the target thickness is included in the optical path and optical path difference of the laser. For another example, according to the refractive index difference among the optical element, the refractive index liquid, and the glass to be measured, the stress distribution position corresponding to the stress value of each point in the glass is re-determined, and the stress distribution test result of the glass is adjusted. Thereby, the calculation result of the stress distribution of the glass to be measured is further refined.
[0042] In the case as shown in Figure 1In the stress measurement device shown, by providing a support on the surface of the prism, a refractive index liquid that matches can be provided between the prism and the glass to be measured, expelling air, reducing the refractive index deviation of the laser passing through the three media, reducing the light loss caused by the interface, and avoiding the problem of inaccurate measurement caused by the relative sliding of the glass to be measured during measurement due to the refractive index matching liquid.
[0043] Next, the optical element of the present application will be described with reference to specific drawings.
[0044] Figure 2 is a schematic structural diagram of an optical element provided by an embodiment of the present application. As Figure 2 shown in (a) therein, the optical element can be a triangular prism. Or as Figure 2 shown in (b) therein, the optical element is a Dove prism. Or as Figure 2 shown in (c) therein, the optical element is composed of a first prism 210 and a second prism 220. Figure 2 Specifically shown in (d) therein Figure 2 are different angles of the prism in (c) therein. The above optical elements can be used in a stress measurement device as Figure 1 shown therein.
[0045] As Figure 2 shown in (a), (b), and (c) therein, the optical element includes an inclined surface, and this inclined surface is the first surface 240. The angle of this inclined surface can be 10 to 35 degrees, and the laser emission direction of the light emission unit is perpendicular to the inclined surface. In the case of Figure 2 shown in (a) therein, the surface 241 can be the exit surface of the scattered light. In the case of Figure 2 shown in (b) therein, the surface 242 can be the exit surface of the scattered light. In the case of Figure 2 shown in (c) and (d) therein, the surface 243 can be the exit surface of the scattered light.
[0046] As Figure 2 shown in (a), (b), and (c) therein, in the optical element, a plurality of supports 230 can be specifically arranged outside the coverage area 260 of the laser and / or the scattered light on the second surface 250. Thus, the arrangement of the supports will not affect the coupling of the laser and / or the subsequent collection of the scattered light, avoiding the light loss caused by the arrangement of the supports.
[0047] In some implementation manners, a plurality of supports 230 are arranged around the coverage area 260. In the stress distribution test of general glass, the size of the glass to be measured is larger than the size of the optical element. The refractive index liquid to be filled between the optical element and the glass to be measured is viscous. By arranging the supports around the coverage area, the refractive index liquid can be further restricted within the coverage area of the laser and / or the scattered light, improving the accuracy of the test result of the glass stress distribution.
[0048] In some implementations, the support member has an anti-slip mechanism, thereby avoiding relative movement between the optical element and the glass to be measured due to the filling of the refractive index liquid and improving the accuracy of the test result of the glass stress distribution. Wherein, the anti-slip mechanism may specifically include a top surface 231 with a matte finish, thereby increasing the friction between the optical element and the glass to be measured. In addition, the anti-slip structure may also include a viscous material, etc., which is determined according to the actual situation.
[0049] In some implementations, the support member is cylindrical, thereby increasing the contact area with the glass to be measured. In some implementations, the support member is hemispherical, thereby enabling the support member to contact the glass to be measured faster. In some implementations, the support member is conical.
[0050] In some implementations, the support member is made of a transparent material, thereby reducing the influence of the setting of the support member on the test. For example, the support member may specifically be glass, plastic, rubber, etc. made of a transparent material, which is determined according to the actual situation. Further, the refractive index of the support member may be similar to that of the optical element.
[0051] In some implementations, the number of the plurality of support members 230 is greater than or equal to 3. Thus, the gap height between the optical element and the glass to be measured is better ensured, and relative movement between the optical element and the glass to be measured due to the filling of the refractive index liquid is avoided, so that problems occur in the test.
[0052] In addition, in the case shown in Figure 2 Figure (c) below, the optical element is composed of a first prism 210 and a second prism 220. The first prism 210 includes an inclined surface, and the first prism may be Figure 2 the structure shown in Figure (a) or (b) below. The second prism 220 is a flat plate structure. Wherein, the first surface 240 is located on the first prism 210, and the second surface 250 is located on the second prism. The plurality of support members 230 are arranged in a first region 270 of the second surface 250, and the first region 270 is a region outside the projection of the first prism 210 on the second surface 250. Thus, the setting of the support member will not affect the coupling of the laser and / or the subsequent collection of the scattered light, and avoid the light loss caused by the setting of the support member.
[0053] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.
[0054] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.
[0055] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.
[0056] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0057] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.
[0058] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.
[0059] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.
Claims
1. A stress measuring device for glass, characterized in that, It includes a light emitting unit, an optical element, a collection unit and a processing unit, wherein: The light emitting unit is used for emitting laser light; The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit faces the first surface, and the second surface is in contact with the glass to be measured. Wherein, the first surface is the incident surface of the laser, and the second surface is the exit surface of the laser; The collection unit is used for collecting scattered light and processing the scattered light into a data signal. The scattered light is formed by the interference generated after the laser enters the glass to be measured; The processing unit is used for determining the stress distribution in the glass to be measured according to the data signal; Wherein, a plurality of support members are arranged on the second surface, and the height of the support members corresponds to a first thickness, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be measured and the second surface.
2. The device according to claim 1, characterized in that The plurality of support members are arranged outside the coverage area of the laser and / or the scattered light on the second surface.
3. The device according to claim 2, wherein The plurality of support members are arranged around the coverage area.
4. The device according to any one of claims 1 to 3, characterized in that The optical element is composed of a first prism and a second prism. The first prism includes an inclined surface, and the second prism is a flat plate structure. Wherein, the first surface is located on the first prism, the second surface is located on the second prism, and the plurality of support members are arranged in a first area of the second surface, and the first area is the area outside the projection of the first prism on the second surface.
5. The device according to any one of claims 1 to 4, characterized in that, The number of the plurality of support members is greater than or equal to 3.
6. The device according to any one of claims 1 to 5, characterized in that The support member has an anti-slip mechanism.
7. The device according to claim 6, characterized in that, The anti-slip mechanism includes a top surface after being frosted.
8. The device according to any one of claims 1 to 7, characterized in that, The support member is any one of a hemispherical shape, a cylindrical shape, or a conical shape.
9. The device according to any one of claims 1 to 8, characterized in that The support member is made of a transparent material.
10. An optical element, characterized in that, In a stress measurement device for glass, the device includes a light emitting unit, an optical element, a collection unit and a processing unit. Wherein, the light emitting unit is used for emitting laser light, the collection unit is used for collecting the scattered light generated after the laser enters the glass to be measured and processing the scattered light into a data signal, and the processing unit is used for determining the stress distribution in the glass to be measured according to the data signal. The scattered light is formed by the interference generated after the laser enters the glass to be measured, wherein: The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit faces the first surface, and the second surface is in contact with the glass to be measured. Wherein, the first surface is the incident surface of the laser, and the second surface is the exit surface of the laser; Wherein, a plurality of support members are arranged on the second surface, and the height of the support members corresponds to a first thickness, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be measured and the second surface.