A stress measuring device for glass and optical elements
By setting supports and shims on the prism surface, the problem of the gap between the prism and the glass affecting the detection light is solved, realizing efficient and low-cost glass stress measurement and improving the accuracy and efficiency of the measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING JEFFOPTICS CO LTD
- Filing Date
- 2025-02-12
- Publication Date
- 2026-06-05
AI Technical Summary
During glass stress measurement, the gap between the prism and the glass affects the propagation of the detection light, resulting in excessive reflected light intensity or total internal reflection. Furthermore, directly filling the glass with refractive index liquid may cause relative sliding between the glass and the liquid, affecting the accuracy and efficiency of the measurement.
Supports and gaskets are installed on the prism surface to ensure the matching of the refractive index fluid. The design of the supports and gaskets reduces the amount of fluid used, avoids the presence of air, and reduces light loss and slippage effects.
It improves the accuracy and efficiency of measurements, reduces testing costs, minimizes the possibility of bubble formation, and ensures the precision of measurement results.
Smart Images
Figure CN224327832U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of glass testing, and more particularly to a stress measuring device and optical element for glass. Background Technology
[0002] High-purity, high-quality glass can be used in lenses, screens, and optical lenses. However, for optical glass, it's crucial to control internal stress, such as through processes like fine annealing. For architectural glass, automotive glass, and mobile phone cover glass, strength needs to be increased, and stress testing is more widely used in this area. Prestressing is used to improve the strength of glass. There are currently two methods for generating prestress: physical tempering and chemical tempering. To quantify the strength of glass, it's necessary to measure the surface stress and stress distribution.
[0003] There are currently two principles for measuring surface stress. The first is the optical waveguide method. Typically, after glass is tempered, the surface becomes a compressive stress layer with a high refractive index, while the core layer has a low refractive index, forming an optical waveguide layer. Two beams vibrating perpendicularly, TM and TE, have different refractive indices in this waveguide layer. The refractive index of the guided mode reflects the refractive index of the surface layer. The ratio of the refractive index difference between TM and TE to the photoelastic coefficient equals the stress value. Typical applications include the differential surface refraction method and the surface grazing angle polarization method.
[0004] The second method is laser scattering. The laser beam undergoes Rayleigh scattering with the sample molecules within the sample. The phase of the TM (transient laser) beam scattered along the optical path is the same as the phase of the TM beam at the scattering point, and the intensity of the scattered light varies with the observation angle. Similarly, the phase of the TE (transient laser) beam scattered along the optical path is the same as the phase of the TE beam at the scattering point, and the intensity of the scattered light also varies with the observation angle. The TM and TE scattered beams interfere destructively and constructively in a plane perpendicular to the observation angle due to their phase difference, allowing us to observe changes in light intensity along the propagation path. By modulating the phase difference between the incident TM and TE lasers, we can obtain the intensity variation at a specified scattering point under different incident laser phase differences, and thus calculate the phase difference between the TM and TE beams at that point.
[0005] However, when the detection light passes through the interface, the most significant factor affecting its performance is the gap between the prism and the glass. Air has a refractive index of 1, while the prism and the sample have refractive indices of 1.5 or higher. The refractive index matching liquid should be close to the prism and sample. Without the matching liquid, the reflected light intensity will be too high; if the incident angle is large, total internal reflection will occur at the prism gap interface, preventing the detection light from entering the sample. Therefore, a refractive index liquid needs to be filled between the prism and the glass. However, directly filling the gap between the prism and the glass with the refractive index liquid will cause relative sliding between the glass and the matching liquid, affecting the test. Utility Model Content
[0006] This application provides a stress measurement device and optical element for glass. By setting a support and a shim on the prism surface, a matching refractive index fluid can be placed between the prism and the glass under test, eliminating air. Furthermore, by setting the shim, the amount of refractive index fluid used can be further reduced, which not only lowers testing costs but also reduces the possibility of air bubbles forming in the refractive index fluid during measurement. This reduces the influence of air bubbles in the refractive index fluid on the measurement results, reduces the refractive index deviation of the laser passing through the three media, and reduces light loss caused by interfaces. Simultaneously, it avoids the measurement inaccuracies caused by relative sliding of the glass under test during measurement due to the refractive index matching fluid.
[0007] In a first aspect, a stress measurement device for glass is provided, comprising a light emitting unit, an optical element, a data acquisition unit, and a processing unit, wherein: the light emitting unit is used to emit laser light; the optical element includes a first surface and a second surface, the laser emission direction of the light emitting unit is towards the first surface, and the second surface is in contact with the glass to be tested, wherein the first surface is the incident surface of the laser light, and the second surface is the exit surface of the laser light; the data acquisition unit is used to acquire scattered light and process the scattered light into a data signal, the scattered light being formed by interference generated after the laser light is incident on the glass to be tested; the processing unit is used to determine the stress distribution in the glass to be tested based on the data signal; wherein, a plurality of supports and a gasket are disposed on the second surface, the height of the supports corresponds to a first thickness, the thickness of the gasket is less than or equal to the first thickness, the plurality of supports are disposed around the gasket, and the first thickness is the target thickness of the refractive index liquid to be filled between the glass to be tested and the second surface.
[0008] In the aforementioned stress measurement device, by setting a support on the prism surface, a matching refractive index fluid can be placed between the prism and the glass under test. This eliminates air, reduces the refractive index deviation between the three media through which the laser passes, minimizes light loss caused by the interface, and avoids measurement inaccuracies caused by relative sliding of the glass under test during measurement due to the refractive index matching fluid. Furthermore, the added shims can reduce the amount of refractive index fluid used, lowering testing costs and reducing the probability of air bubbles appearing in the refractive index fluid during testing, thereby improving overall measurement efficiency.
[0009] In conjunction with the first aspect, in some implementations of the first aspect, multiple supports are positioned outside the coverage area of the laser and / or scattered light on the second surface. Therefore, the placement of the supports does not affect the coupling of the laser and / or the subsequent acquisition of the scattered light, avoiding optical loss caused by the support placement.
[0010] In conjunction with the first aspect, in some implementations of the first aspect, the projection area of the gasket on the second surface includes the area covered by laser and / or scattered light on the second surface. This reduces the amount of refractive index liquid required for the measurement area, thereby reducing the probability of air bubbles appearing in the refractive index liquid and lowering the operational complexity during the testing process.
[0011] In conjunction with the first aspect, in some implementations of the first aspect, multiple supports are arranged around the coverage area. Therefore, the arrangement of the supports does not affect the coupling of the laser and / or the subsequent acquisition of scattered light, avoiding optical loss caused by the support arrangement.
[0012] In conjunction with the first aspect, in some implementations of the first aspect, the optical element consists of a first prism and a second prism. The first prism includes an inclined surface, and the second prism has a flat plate structure. A first surface is located on the first prism, and a second surface is located on the second prism. Multiple supports are disposed in a first region of the second surface, and a spacer is disposed in a second region of the second surface. The second region includes the projection area of the first prism on the second surface, and the first region is the region on the second surface excluding the second region. Therefore, the placement of the spacer and the supports do not interfere with each other. The spacer reduces the amount of refractive index liquid required in the test area, and the placement of the supports does not affect the coupling of the laser and / or the subsequent acquisition of scattered light, avoiding light loss caused by the support placement and preventing uneven thickness of the refractive index liquid due to a small spacer, thus reducing the complexity of data processing.
[0013] In conjunction with the first aspect, in some implementations of the first aspect, the number of multiple support members is greater than or equal to three. This better ensures the clearance height between the optical element and the glass under test, preventing relative movement between the optical element and the glass under test due to the filling of the refractive index fluid, which could cause testing problems.
[0014] In conjunction with the first aspect, in some implementations of the first aspect, the support member has an anti-slip mechanism. This prevents relative movement between the optical element and the glass under test due to the filling of the refractive index fluid, thereby improving the accuracy of the test results for the glass stress distribution.
[0015] In conjunction with the first aspect, in some implementations of the first aspect, the anti-slip mechanism includes a frosted top surface, thereby increasing the friction between the optical element and the glass under test.
[0016] In conjunction with the first aspect, in some implementations of the first aspect, the support member is any one of hemispherical, cylindrical, or conical shapes. In some implementations, the support member is cylindrical, thereby increasing the contact area with the glass under test. In some implementations, the support member is hemispherical, thereby enabling the support member to make contact with the glass under test more quickly.
[0017] In conjunction with the first aspect, in some implementations of the first aspect, the gasket is any one of a circular gasket, a square gasket, or a polygonal gasket. In some implementations, the gasket is a circular gasket, which further reduces the possibility of air bubbles forming in the refractive index liquid.
[0018] In conjunction with the first aspect, in some implementations of the first aspect, the side of the shim closest to the glass under test is a smooth surface. This smooth surface further reduces the likelihood of air bubbles forming between the filled refractive index liquid and the glass under test, thereby reducing the complexity of the debugging process.
[0019] In conjunction with the first aspect, in some implementations of the first aspect, the spacer is integrated onto the second surface of the optical element. This reduces the complexity of measurement and calibration. Furthermore, it also reduces measurement errors introduced by bonding with materials such as optical adhesives.
[0020] In conjunction with the first aspect, in some implementations of the first aspect, the support and the gasket are made of transparent materials. This reduces the impact of the support configuration on the test.
[0021] Secondly, 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 data acquisition unit, and a processing unit. The light emitting unit emits a laser, the data acquisition unit acquires the scattered light generated after the laser is incident on the glass under test, and processes the scattered light into a data signal. The processing unit determines the stress distribution in the glass under test based on the data signal. The scattered light is formed by interference generated after the laser is incident on the glass under test. The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit is towards the first surface, and the second surface is in contact with the glass under test. The first surface is the incident surface of the laser, and the second surface is the exit surface of the laser. Multiple supports and gaskets are provided on the second surface. The height of the supports corresponds to a first thickness, and the thickness of the gaskets is less than or equal to the first thickness. The multiple supports are arranged around the gaskets. The first thickness is the target thickness of the refractive index liquid to be filled between the glass under test and the second surface.
[0022] By incorporating a support on the prism surface, a matching refractive index fluid can be placed between the prism and the glass under test. This eliminates air, reduces refractive index deviations between the three media through which the laser passes, minimizes light loss at the interface, and avoids measurement inaccuracies caused by relative slippage of the glass under test due to the refractive index matching fluid. Furthermore, by adding shims, the amount of refractive index fluid used can be further reduced, not only lowering testing costs but also reducing the possibility of air bubbles forming in the refractive index fluid during measurement. This minimizes the impact of air bubbles in the refractive index fluid on the measurement results. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of a glass stress measuring device provided in an embodiment of this application.
[0024] Figure 2 This is a schematic diagram of another glass stress measuring device provided in an embodiment of this application.
[0025] Figure 3 This is a schematic diagram of another glass stress measuring device provided in the embodiments of this application.
[0026] Figure 4 This is a schematic diagram of the structure of an optical element provided in an embodiment of this application.
[0027] Figure 5 This is a schematic diagram of another optical element provided in an embodiment of this application.
[0028] Figure 6 This is a schematic diagram of another optical element provided in the embodiments of this application.
[0029] Figure 7 yes Figure 6 A schematic diagram of the optical components at different angles. Detailed Implementation
[0030] The technical solutions in this application will now be described with reference to the accompanying drawings.
[0031] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
[0032] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0033] In the description of the embodiments of this application, the terms "upper," "lower," "vertical," "horizontal," etc., indicate the orientation or positional relationship relative to the orientation or position of the components shown in the drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They can change accordingly depending on the orientation of the components in the drawings, and therefore should not be construed as limiting this application.
[0034] The terms “comprising” and “having” and any variations thereof used in the embodiments of this application shown below are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.
[0035] In the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Embodiments or designs described as "exemplary" or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. The use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.
[0036] High-purity, high-quality glass can be used in lenses, screens, and optical lenses. However, for optical glass, it's crucial to control internal stress, such as through processes like fine annealing. For architectural glass, automotive glass, and mobile phone cover glass, strength needs to be increased, and stress testing is more widely used in this area. Prestressing is used to improve the strength of glass. There are currently two methods for generating prestress: physical tempering and chemical tempering. To quantify the strength of glass, it's necessary to measure the surface stress and stress distribution.
[0037] There are currently two principles for measuring surface stress. The first is the optical waveguide method. Typically, after glass is tempered, the surface becomes a compressive stress layer with a high refractive index, while the core layer has a low refractive index, forming an optical waveguide layer. Two beams vibrating perpendicularly, TM and TE, have different refractive indices in this waveguide layer. The refractive index of the guided mode reflects the refractive index of the surface layer. The ratio of the refractive index difference between TM and TE to the photoelastic coefficient equals the stress value. Typical applications include the differential surface refraction method and the surface grazing angle polarization method.
[0038] The second method is laser scattering. The laser beam undergoes Rayleigh scattering with the sample molecules within the sample. The phase of the TM (transient laser) beam scattered along the optical path is the same as the phase of the TM beam at the scattering point, and the intensity of the scattered light varies with the observation angle. Similarly, the phase of the TE (transient laser) beam scattered along the optical path is the same as the phase of the TE beam at the scattering point, and the intensity of the scattered light also varies with the observation angle. The TM and TE scattered beams interfere destructively and constructively in a plane perpendicular to the observation angle due to their phase difference, allowing us to observe changes in light intensity along the propagation path. By modulating the phase difference between the incident TM and TE lasers, we can obtain the intensity variation at a specified scattering point under different incident laser phase differences, and thus calculate the phase difference between the TM and TE beams at that point.
[0039] However, when the detection light passes through the interface, the most significant factor affecting its performance is the gap between the prism and the glass. Air has a refractive index of 1, while the prism and the sample have refractive indices of 1.5 or higher. The refractive index matching liquid should be close to the prism and sample. Without the matching liquid, the reflected light intensity will be too high; if the incident angle is large, total internal reflection will occur at the prism gap interface, preventing the detection light from entering the sample. Therefore, a refractive index liquid needs to be filled between the prism and the glass. However, directly filling the gap between the prism and the glass with the refractive index liquid can cause relative sliding between the glass and the matching liquid, and air bubbles are also easily generated in the refractive index liquid, thus affecting the efficiency and accuracy of the test results.
[0040] Therefore, this application provides a glass stress measurement device and optical element. By setting a support and a gasket on the prism surface, a matching refractive index liquid can be placed between the prism and the glass under test, eliminating air. Furthermore, by setting the gasket, the amount of refractive index liquid used can be further reduced, which not only lowers testing costs but also reduces the possibility of air bubbles forming in the refractive index liquid during measurement. This reduces the impact of air bubbles in the refractive index liquid on the measurement results, reduces the refractive index deviation of the laser passing through the three media, and reduces light loss caused by interfaces. Simultaneously, it avoids the measurement inaccuracies caused by relative sliding of the glass under test during measurement due to the refractive index matching liquid.
[0041] Figure 1 This is a schematic diagram of a glass stress measuring device provided in an embodiment of this application. Figure 1 As shown, the device includes a light emitting unit, optical elements, a collection unit 140, and a processing unit (not shown in the figure).
[0042] The optical emitting unit is used to emit laser light. Specifically, the optical emitting unit may include a laser emitter 111 and a polarization control element 112. The laser light may include two mutually perpendicular polarized light components. It should be understood that the polarization control element 112 in the figure is only a schematic illustration; the actual polarization control element may include a polarizer, phase controller, etc., determined according to the actual situation.
[0043] The optical element can specifically refer to a prism, which is used to couple a laser beam to the glass 130 under test. The optical element includes a first surface 121 and a second surface 122. The laser emission direction of the light emitting unit is towards the first surface 121, and the second surface 122 is in contact with the glass 130 under test.
[0044] The first surface 121 is the incident surface of the laser, and the second surface 122 is the exit surface of the laser. Multiple supports 123 and spacers 125 are disposed on the second surface 122. The height of the supports 123 corresponds to a first thickness, which is the target thickness of the refractive index liquid to be filled between the glass to be tested and the second surface 122. The thickness of the spacers 125 is less than or equal to the first thickness, and the spacers 125 are disposed within the area formed by the multiple supports 123. It should be understood that... Figure 1 Specifically, an optical element is shown supporting the glass 130 under test.
[0045] Figure 2 This is a schematic diagram of another glass stress measuring device provided in an embodiment of this application. Figure 2 As shown, the optical element can also be located on the glass 130 under test. The specific arrangement of the support 123 and the gasket 125 on the optical element will be discussed in conjunction with the following appendix. Figure 4 To be continued Figure 7 .
[0046] The acquisition unit 140 is used to acquire scattered light and process it into a data signal. The acquisition unit 140 can be a camera or a light receiver, depending on the specific situation. Furthermore, the acquisition unit 140 may also include an image data processing circuit and a storage device. Alternatively, the acquisition unit 140 may also include a photoelectric conversion circuit, a data processing circuit, and a storage device. The scattered light is formed by interference generated after a laser beam is incident on the glass 130 under test. Because the two polarized rays in the laser propagate at different speeds within the glass, an optical path difference occurs. Therefore, the intensity of the scattered light varies at different points on the glass, resulting in alternating bright and dark scattered interference fringes.
[0047] In such Figure 1 and Figure 2 In this case, the second surface 122 also serves as the incident surface of the scattered light, and the third surface 124 can be the exit surface of the scattered light. The acquisition unit 140 can acquire the scattered light from the third surface 124.
[0048] Figure 3 This is a schematic diagram of another glass stress measuring device provided in an embodiment of this application. In such... Figure 3 In the case shown, the acquisition unit 140 can also acquire the scattered light from the side of the glass 130 to be tested that is away from the optical element.
[0049] The processing unit includes a processor, a reader, and a memory. It is used to determine the stress distribution in the glass under test based on the data signal. For example, the stress value at each point in the glass under test can be calculated using the following formula:
[0050]
[0051] in, ρ represents the stress value at various points on the glass under test, in MPa. C represents the stress optical constant of the glass under test, in MPa. -1 . denoted as , where is the optical path difference between the two polarized light components of the laser beam on the glass under test, in nm. S represents the propagation distance of the light through the glass, in mm.
[0052] Furthermore, since the target thickness of the refractive index liquid to be filled between the optical element and the glass 130 under test corresponds to the height of the support 123, the actual filling thickness of the refractive index liquid is also related to the thickness of the gasket 125. Therefore, the processing unit can also incorporate one or more parameters, such as the specific refractive index of the refractive index liquid, the target thickness, the thickness of the gasket 125, or the filling thickness of the refractive index liquid, into the stress value calculation at each point of the glass under test.
[0053] For example, the filling thickness of the refractive index liquid is obtained by using the target thickness and the thickness of the gasket 125, and this filling thickness is incorporated into the optical path and optical path difference of the laser. As another example, based on the refractive index difference between the optical element, the refractive index liquid, and the glass under test, the stress distribution location corresponding to the stress value at each point in the glass is re-determined, and the stress distribution test results of the glass are adjusted. This further refines the calculation results of the stress distribution of the glass under test.
[0054] It should be understood that the filling thickness of the refractive index liquid is the difference between the target thickness and the height of the gasket 125, or it can be understood as the filling thickness of the refractive index liquid is the difference between the height of the support 123 and the gasket 125.
[0055] In such Figures 1 to 3 In the stress measurement device shown, by setting supports and shims on the prism surface, a matching refractive index fluid can be placed between the prism and the glass under test, eliminating air. Furthermore, the shims reduce the amount of refractive index fluid used during testing, lowering the likelihood of air bubbles forming in the fluid and reducing setup efficiency and testing costs. Moreover, it reduces refractive index deviations between the three media through which the laser passes, minimizing light loss at the interfaces and avoiding measurement inaccuracies caused by relative sliding of the glass under test due to the refractive index matching fluid.
[0056] The optical elements of this application will now be described with reference to the accompanying drawings.
[0057] Figure 4 This is a schematic diagram of the structure of an optical element provided in an embodiment of this application. Figure 4 As shown, the optical element can be a triangular prism.
[0058] Figure 5 This is a schematic diagram of another optical element provided in an embodiment of this application. For example... Figure 5 As shown, the optical element is a Dove prism.
[0059] Figure 6 This is a schematic diagram of another optical element provided in an embodiment of this application. For example... Figure 6 As shown, the optical element consists of a first prism and a second prism.
[0060] Figure 7 yes Figure 6 A schematic diagram of the optical components at different angles. Figure 7 Specifically shown Figure 6 Different angles of the prism. The above optical elements can be used for, for example... Figures 1 to 3 The stress measuring device shown.
[0061] like Figures 4 to 6 The optical element shown includes an inclined surface, which is a first surface 240. The angle of this inclined surface can be 10 to 35 degrees, and the laser emission direction of the light emitting unit is perpendicular to the inclined surface. In... Figure 4 In this case, surface 241 can be the exit surface for scattered light. In situations such as... Figure 5 In this case, surface 242 can be the exit surface for scattered light. In situations such as... Figure 6 and Figure 7 In this case, surface 243 can be the emitting surface of scattered light.
[0062] like Figures 4 to 6 In the optical element shown, multiple supports 230 can be specifically positioned outside the coverage area 260 of the laser and / or scattered light on the second surface 250. Therefore, the placement of the supports will not affect the coupling of the laser and / or the subsequent acquisition of the scattered light, avoiding optical loss caused by the support placement.
[0063] like Figures 4 to 6 In the optical element shown, the spacer 232 may be disposed within the coverage area 260 on the second surface 250 for laser and / or scattered light. The projection area of the spacer 232 on the second surface 250 includes the coverage area 260.
[0064] It should be understood that the area of the projected region of the gasket 232 on the second surface 250 is greater than or equal to the area of the covered region 260.
[0065] In some implementations, multiple supports 230 are arranged around the coverage area 260. Alternatively, multiple supports 230 can be understood as arranged around a spacer 232. In typical glass stress distribution testing, the size of the glass under test is larger than the size of the optical element. The refractive index liquid to be filled between the optical element and the glass under test is viscous. By arranging supports around the coverage area, the refractive index liquid can be further confined within the coverage area of the laser and / or scattered light. Placing a spacer within the coverage area not only reduces the amount of refractive index liquid used but also reduces the possibility of air bubbles forming in the filled refractive index liquid, thereby improving the testing efficiency and measurement accuracy of glass stress distribution.
[0066] In some implementations, the support component has an anti-slip mechanism. This prevents relative movement between the optical element and the glass under test due to the filling of the refractive index fluid, thus improving the accuracy of the glass stress distribution test results. Specifically, this anti-slip mechanism may include a frosted top surface 231, thereby increasing the friction between the optical element and the glass under test. Furthermore, the anti-slip structure may also include adhesive materials, depending on the specific circumstances.
[0067] In some implementations, the side of the gasket 232 and the side near the glass to be tested are polished smooth surfaces, which can further reduce the possibility of air bubbles being generated in the filling refractive index liquid.
[0068] In some implementations, multiple supports 230 are arranged around the projection area of the pad 232 on the second surface 250.
[0069] In some implementations, the support is cylindrical, thereby increasing the contact area with the glass under test. In some implementations, the support is hemispherical, allowing it to make contact with the glass more quickly. In some implementations, the support is conical.
[0070] In some implementations, the pad 232 is a circular pad, thereby better covering the coverage area 260 of the laser and / or scattered light on the second surface 250.
[0071] In other implementations, the gasket 232 may also be a square gasket, a polygonal gasket, or other shapes, and this application does not impose any special limitations on this.
[0072] It should be understood that circular gaskets include cylinders with a relatively low height, and this application does not specifically limit this.
[0073] In some implementations, the support and spacer are made of transparent materials, thereby reducing the impact of the support's placement on the test. For example, the support and spacer can be made of transparent materials such as glass, plastic, or rubber, depending on the specific circumstances. Furthermore, the refractive index of the support can be similar to that of the optical element.
[0074] In some implementations, the number of multiple support members 230 is greater than or equal to 3. This better ensures the gap height between the optical element and the glass under test, avoiding relative movement between the optical element and the glass under test due to the filling of the refractive index fluid, which could cause testing problems.
[0075] In some implementations, the spacer 232 is fixed to the second surface 250, that is, the spacer 232 is fixed to the optical element.
[0076] In some implementations, the spacer 232 and the optical element are bonded together with optical adhesive, and the bonding surface is free of air bubbles.
[0077] In some other implementations, the optical element itself can integrate the spacer 232, eliminating the need for additional bonding.
[0078] As an example and not a limitation, optical elements with integrated pads 232 can be produced by processes such as etching and optical molding, and this application does not impose any special limitations on this.
[0079] In addition, in such Figure 6 In the case shown, the optical element consists of a first prism and a second prism. The first prism includes an inclined surface, and the first prism can be... Figure 4 or Figure 5 The structure is shown. The second prism is a flat plate structure. A first surface 240 is located on the first prism, and a second surface 250 is located on the second prism. Multiple support members 230 are disposed in a first region 270 of the second surface 250, which is the area outside the projection of the first prism onto the second surface 250. A gasket 232 is disposed in a second region 280 of the second surface, which includes the projection area of the first prism onto the second surface 250.
[0080] It should be understood that the second surface 250 includes a first region 270 and a second region 280, and the area of the second surface 250 is the sum of the areas of the first region 270 and the second region 280.
[0081] In summary, the support structure in the optical element provided in this application does not affect the coupling of the laser and / or the subsequent acquisition of scattered light, thus avoiding optical loss caused by the support structure. Furthermore, the spacer covering the field of view formed by the beam allows for a more uniform filling thickness of the refractive index liquid, simplifying calculations.
[0082] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0083] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0084] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.
[0085] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0086] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0087] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the 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 to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A stress measuring device for glass, characterized in that, It includes a light emitting unit, optical elements, a data acquisition unit, and a processing unit, wherein: The optical emitting unit is used to emit laser light; The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit is towards the first surface, and the second surface is in contact with the glass to be tested. The first surface is the incident surface of the laser, and the second surface is the exit surface of the laser. The acquisition unit is used to acquire scattered light and process the scattered light into a data signal. The scattered light is formed by the interference generated after the laser is incident on the glass under test. The processing unit is used to determine the stress distribution in the glass under test based on the data signal; The second surface is provided with a plurality of supports and a gasket. The height of the supports corresponds to the first thickness, and the thickness of the gasket is less than or equal to the first thickness. The plurality of supports are arranged around the gasket. The first thickness is the target thickness of the refractive index liquid to be filled between the glass to be tested and the second surface.
2. The apparatus according to claim 1, characterized in that, The plurality of supports are disposed outside the area covered by the laser and / or the scattered light on the second surface.
3. The apparatus according to claim 1, characterized in that, The projection area of the pad on the second surface includes the area covered by the laser and / or the scattered light on the second surface.
4. The apparatus according to claim 2, characterized in that, The plurality of support members are arranged around the covered area.
5. The apparatus according to any one of claims 1 to 4, characterized in that, The optical element comprises a first prism and a second prism. The first prism includes an inclined surface, and the second prism has a flat plate structure. The first surface is located on the first prism, and the second surface is located on the second prism. A plurality of support members are disposed in a first region of the second surface, and a spacer is disposed in a second region of the second surface. The second region includes the projection area of the first prism onto the second surface, and the first region is the area on the second surface other than the second region.
6. The apparatus 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.
7. The apparatus according to any one of claims 1 to 4, characterized in that, The support member has an anti-slip mechanism.
8. The apparatus according to claim 7, characterized in that, The anti-slip mechanism includes a top surface that has been sanded.
9. The apparatus according to any one of claims 1 to 4, characterized in that, The support member can be any one of hemispherical, cylindrical, or conical shapes.
10. The apparatus according to any one of claims 1 to 4, characterized in that, The gasket can be any one of a circular gasket, a square gasket, or a polygonal gasket.
11. The apparatus according to any one of claims 1 to 4, characterized in that, The side of the pad closest to the glass to be tested has a smooth surface.
12. The apparatus according to any one of claims 1 to 4, characterized in that, The spacer is integrated into the second surface of the optical element.
13. The apparatus according to any one of claims 1 to 4, characterized in that, The support and the gasket are made of transparent material.
14. An optical element, characterized in that, In a stress measurement device for glass, the device includes a light emitting unit, an optical element, a data acquisition unit, and a processing unit. The light emitting unit emits a laser beam, the data acquisition unit acquires the scattered light generated after the laser beam strikes the glass under test, and processes the scattered light into a data signal. The processing unit determines the stress distribution in the glass under test based on the data signal. The scattered light is formed by interference generated after the laser beam strikes the glass under test. The optical element includes a first surface and a second surface. The laser emission direction of the light emitting unit is towards the first surface, and the second surface is in contact with the glass to be tested. The first surface is the incident surface of the laser, and the second surface is the exit surface of the laser. The second surface is provided with a plurality of supports and a gasket. The height of the supports corresponds to the first thickness, and the thickness of the gasket is less than or equal to the first thickness. The plurality of supports are arranged around the gasket. The first thickness is the target thickness of the refractive index liquid to be filled between the glass to be tested and the second surface.