Tempered glass stress spot detection device and method

Abstract

The invention discloses a tempered glass stress spot detection device and method, and belongs to the technical field of tempered glass stress spot detection.The device comprises a device to be detected, an angle ruler, an observation system and a processing system.The right-angle side of the angle ruler is located above the device to be detected, and the bevel edge is connected with the observation system; an angle set by the bevel protractor is formed between the observation device and the to-be-measured device, one end, far away from the to-be-measured device, of the observation system is connected with the processing system, and the scattered light is reflected by the to-be-measured device, enters the observation system at the set angle and then enters the processing system. The tempered glass stress spots appearing under different conditions and different angles are quantified and graded; compared with a traditional stress spot test method adopted in a factory, the detection method is high in measurement precision and good in repeatability, the stress spots appearing on the tempered glass are scientifically quantified conveniently and quickly by recording the area proportion and strength of the stress spots, and analysis and evaluation are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of tempered glass stress spot detection, and in particular to a device and method for detecting tempered glass stress spots. Background Art

[0002] Detecting stress spots on tempered glass primarily relies on online and offline testing. However, existing online testing equipment is expensive and not widely available. Therefore, offline testing is often used. However, this method has significant limitations in on-site testing conditions, making it inconvenient and limiting detection efficiency. Especially when evaluating stress spots at construction sites, factors such as differences in on-site environmental factors and the influence of adjacent buildings can easily lead to misjudgments, making it difficult to resolve disputes between clients, curtain wall companies, and glass processing factories. Based on this, the present invention provides a device and method for detecting stress spots on tempered glass. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for detecting stress spots in tempered glass. By combining polarization technology, image processing technology, and data analysis technology, the device and method can quantify and classify stress spots in tempered glass that appear under different conditions and at different angles. Compared with traditional stress spot testing methods used in factories, the detection method of the present invention has high measurement accuracy, good repeatability, and is convenient and fast.

[0004] To achieve the above-mentioned objectives, the present invention provides a device and method for detecting stress spots in tempered glass, comprising a device to be tested, an angle ruler, an observation system, and a processing system. One side of the angle ruler at a right angle is located above the device to be tested, and the hypotenuse is connected to the observation system. The observation device and the device to be tested are at an angle set by the angle ruler. The end of the observation system away from the device to be tested is connected to the processing system. The scattered light is reflected by the device to be tested and enters the observation system at a set angle, and then enters the processing system.

[0005] Preferably, the device to be tested includes a shading curtain and a glass to be tested, the glass to be tested is located above the shading curtain, and the scattered light is irradiated on the middle position of the glass to be tested at an angle set by the angle ruler and reflected to the observation system at the same angle.

[0006] Preferably, the setting angle of the angle ruler is calculated according to Brewster's law, and the calculation process is as follows:

[0007] i θ =tan -1 (n 玻璃 / n 空气 );

[0008] where i θ Indicates the setting angle, which is also the incident angle of scattered light, n 玻璃 and n 空气 are the refractive indices of glass and air, respectively.

[0009] Preferably, the observation system includes a dark box, a polarizing plate group and a high-speed industrial camera. The polarizing plate group is arranged at one end of the dark box close to the glass to be tested, and the high-speed industrial camera is arranged inside the dark box away from the glass to be tested and close to the processing system, and the high-speed industrial camera is connected to the processing system.

[0010] Preferably, the dark box is a truncated cone structure, including a main body and a bottom surface. The polarizing plate group is fixed at one end of the main body close to the glass to be tested, and the bottom surface is arranged at the other end of the main body. The high-speed industrial camera is fixed at the center position of the bottom surface and is located inside the main body. The photos obtained by the high-speed industrial camera are square.

[0011] Preferably, the processing system includes a data transmission line and a host computer. One end of the data transmission line passes through the bottom surface and is connected to the high-speed industrial camera, and the other end is connected to the host computer. The host computer is installed with image processing software.

[0012] The present invention also provides a method for detecting stress spots in tempered glass, which uses the above-mentioned device for detecting stress spots in tempered glass and includes the following steps:

[0013] S1. Preparation before testing;

[0014] S2. After the preparation is completed, use the observation system to collect an image of the scattered light reflected by the device under test;

[0015] S3. The image of the scattered light is transmitted to the processing system, the image data is processed and calculated, the stress spots when the light polarization degree is 0-1 are recorded, the intensity and area of ​​the stress spots are recorded and graded, and the simulation is completed.

[0016] Preferably, the preparations before the test in S1 include:

[0017] S11. Calculate the incident angle i of the scattered light θ , and select the degree of polarization;

[0018] S12. Clean the glass to be tested so that the light transmittance and transparency of the glass to be tested are not affected;

[0019] S13. Place the glass to be tested above the shading curtain so that the shading curtain covers the back of the glass to be tested.

[0020] Preferably, the process of using the observation system to collect an image of scattered light reflected by the device under test in S2 is as follows:

[0021] S21, adjusting the shooting angle and polarization degree by using an angle ruler and a polarizing plate group so that the shooting angle and the incident angle of the angular scattered light with respect to the central axis of the glass are the same;

[0022] S22. Use a high-speed industrial camera to capture the position where the scattered light shines on the glass to be tested, with the shooting range covering the entire glass to be tested, to obtain a square photo.

[0023] Preferably, the process of S3 is:

[0024] S31, transmitting the square photo data obtained in S22 to the host computer via a data transmission line;

[0025] S32, the image processing software in the host computer calculates the square photo data to obtain the stress spot intensity and area at this time;

[0026] S33. Record and classify the stress spots according to their intensity and area, completing the detection.

[0027] Therefore, the present invention employs a device and method for detecting stress spots in tempered glass, employing the aforementioned structure. This device and method quantitatively analyzes the depth and severity of stress spots under standard lighting conditions, ensuring that glass processing plants, testing agencies, and users utilize a unified evaluation standard for detecting and grading stress spots in tempered glass. Suitable for factory testing, laboratory testing, and on-site testing, this device employs a photoelastic stress method combined with currently mature polarization, image processing, and data analysis technologies to analyze stress spots. This method offers enhanced measurement accuracy, repeatability, convenience, and a clear, scientifically sound grading system.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a diagram of the overall structure of a device for detecting stress spots on tempered glass according to the present invention when the incident angle of scattered light is 56.3°;

[0030] Figure 2 This is a flow chart of a method for detecting stress spots in tempered glass according to the present invention;

[0031] Figure 3 This is a result diagram of an embodiment of a device and method for detecting stress spots on tempered glass according to the present invention;

[0032] Reference numerals

[0033] 1. Device to be tested; 11. Shading curtain; 12. Glass to be tested; 2. Angle ruler; 3. Observation system; 31. Darkroom; 311. Main body; 312. Bottom surface; 32. Polarizer set; 33. High-speed industrial camera; 4. Processing system; 41. Data transmission line; 42. Host computer. DETAILED DESCRIPTION

[0034] Example

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0039] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0041] like Figure 1As shown, the present invention provides a device for detecting stress spots in tempered glass, comprising a device to be tested 1, an angle ruler 2, an observation system 3 and a processing system 4. One side of the angle ruler 2 at a right angle is located above the device to be tested 1, and the hypotenuse is connected to the observation system 3. The observation device and the device to be tested 1 are at an angle set by the angle ruler 2. The end of the observation system 3 away from the device to be tested 1 is connected to the processing system 4. The scattered light is reflected by the device to be tested 1 and enters the observation system 3 at a set angle, and then enters the processing system 4.

[0042] The device to be tested 1 includes a shading curtain 11 and a glass to be tested 12. The glass to be tested 12 is located above the shading curtain 11. The scattered light is irradiated on the middle position of the glass to be tested 12 at the angle set by the angle ruler 2 and is reflected to the observation system 3 at the same angle.

[0043] The setting angle of angle ruler 2 is calculated according to Brewster's law. The calculation process is as follows:

[0044] i θ =tan -1 (n 玻璃 / n 空气 );

[0045] where i θ Indicates the setting angle, which is also the incident angle of scattered light, n 玻璃 and n 空气 are the refractive indices of glass and air, respectively.

[0046] The observation system 3 includes a dark box 31, a polarizing plate group 32 and a high-speed industrial camera 33. The polarizing plate group 32 is arranged at one end of the dark box 31 close to the glass to be tested 12, and the high-speed industrial camera 33 is arranged inside the dark box 31 away from the glass to be tested 12 and close to the processing system 4, and the high-speed industrial camera 33 is connected to the processing system 4.

[0047] The dark box 31 is a truncated cone structure, including a main body 311 and a bottom surface 312. The polarizer group 32 is fixed to one end of the main body 311 close to the glass to be tested 12, and the bottom surface 312 is set at the other end of the main body 311. The high-speed industrial camera 33 is fixed at the center of the bottom surface 312 and is located inside the main body 311. The photos obtained by the high-speed industrial camera 33 are square.

[0048] The processing system 4 includes a data transmission line 41 and a host computer 42. One end of the data transmission line 41 passes through the bottom surface 312 and is connected to the high-speed industrial camera 33, and the other end is connected to the host computer 42. The host computer 42 is installed with image processing software.

[0049] The present invention also provides a method for detecting stress spots on tempered glass, using the above-mentioned device for detecting stress spots on tempered glass, such as Figure 2 The refractive index n of the glass 12 to be tested is selected in this embodiment.玻璃 =1.5, at this time n 空气 =1, calculate the incident angle i of the scattered light θ =56.3°. Under this condition, the reflected light is completely polarized. At this time, the polarized light interference effect is the highest, and the contrast between the depth of the stress spot is also the largest. Choosing this angle for observation can find the clearest stress spot, which is convenient for quantification and classification. The following steps are included:

[0050] S1. Preparation before testing;

[0051] S11. Calculate the incident angle i of the scattered light θ =56.3°, and select the degree of polarization (0, 0.25, 0.50, 0.75, 1);

[0052] S12, cleaning the glass to be tested 12 so that the light transmittance and transparency of the glass to be tested 12 are not affected, thereby achieving the purpose of affecting the test results;

[0053] S13 , placing the glass to be tested 12 above the light-shielding curtain 11 so that the light-shielding curtain 11 shields the back of the glass to be tested 12 .

[0054] S2. After the preparation is completed, use the observation system 3 to collect an image of the scattered light reflected by the device under test 1;

[0055] S21, adjusting the shooting angle and polarization degree by using the angle ruler 2 and the polarizer group 32 so that the shooting angle and the incident angle of the angular scattered light with respect to the central axis of the glass are the same;

[0056] S22 , using a high-speed industrial camera 33 to photograph the position where the scattered light is irradiated on the glass to be tested 12 , with the photographing range covering the entire glass to be tested 12 , to obtain a square photo.

[0057] S3, the scattered light image is transmitted to the processing system 4, and the image data is processed and calculated. The result is as follows Figure 3 As shown, the stress spots are recorded when the light polarization degree is 0-1, and the intensity and area of ​​the stress spots are recorded to classify them. The classification standard refers to Table 1 to complete the simulation.

[0058] S31, transmitting the square photo data obtained in S22 to the host computer 42 via the data transmission line 41;

[0059] S32, the image processing software in the host computer 42 calculates the square photo data to obtain the stress spot intensity (brightness standard deviation and color difference) and area at this time;

[0060] S33. Record and classify the stress spots according to their intensity and area, completing the detection.

[0061] Table 1 Stress spot classification table using polarization method

[0062]

[0063] Therefore, the present invention employs a device and method for detecting stress spots in tempered glass, employing the aforementioned structure. This device and method quantitatively analyzes the depth and severity of stress spots under standard lighting conditions, ensuring that glass processing plants, testing agencies, and users utilize a unified evaluation standard for detecting and grading stress spots in tempered glass. Suitable for factory testing, laboratory testing, and on-site testing, this device utilizes a photoelastic stress method, combined with currently mature polarization, image processing, and data analysis techniques, to analyze stress spots. This method offers higher measurement accuracy, improved repeatability, and greater convenience and speed. The grading method is clear and scientifically sound. By recording the area percentage and intensity (brightness standard deviation and color difference) of stress spots on tempered glass, stress spots can be scientifically quantified for easier analysis and assessment.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for detecting stress spots on tempered glass, characterized by: The system includes a device to be tested, an angle ruler, an observation system and a processing system. The right-angled side of the angle ruler is located above the device to be tested, and the hypotenuse is connected to the observation system. The observation device and the device to be tested are at an angle set by the angle ruler. The end of the observation system away from the device to be tested is connected to the processing system. The scattered light is reflected by the device to be tested and enters the observation system at a set angle, and then enters the processing system.

2. The device for detecting stress spots on tempered glass according to claim 1, wherein: The device to be tested includes a shading curtain and a glass to be tested. The glass to be tested is located above the shading curtain. Scattered light is irradiated on the middle position of the glass to be tested at an angle set by an angle ruler and is reflected to the observation system at the same angle.

3. The device for detecting stress spots on tempered glass according to claim 2, wherein: The setting angle of the angle ruler is calculated according to Brewster's law. The calculation process is as follows: Yo θ =tan -1 (n 玻璃 / n 空气 ); where i θ Indicates the setting angle, which is also the incident angle of scattered light, n 玻璃 and n 空气 are the refractive indices of glass and air, respectively.

4. The device for detecting stress spots in tempered glass according to claim 3, wherein: The observation system includes a dark box, a polarizing plate group and a high-speed industrial camera. The polarizing plate group is arranged at one end of the dark box close to the glass to be tested, and the high-speed industrial camera is arranged inside the dark box away from the glass to be tested and close to the processing system. The high-speed industrial camera is connected to the processing system.

5. The device for detecting stress spots in tempered glass according to claim 4, characterized in that: The dark box is a frustum structure, including a main body and a bottom surface. The polarizer group is fixed to one end of the main body close to the glass to be tested, and the bottom surface is set at the other end of the main body. The high-speed industrial camera is fixed at the center of the bottom surface and is located inside the main body. The photos taken by the high-speed industrial camera are square.

6. The device for detecting stress spots in tempered glass according to claim 5, characterized in that: The processing system includes a data transmission line and a host computer. One end of the data transmission line passes through the bottom surface and is connected to the high-speed industrial camera, and the other end is connected to the host computer. The host computer is installed with image processing software.

7. A method for detecting stress spots on tempered glass, characterized by: The device for detecting stress spots on tempered glass according to any one of claims 1 to 6 comprises the following steps: S1. Preparation before testing; S2. After the preparation is completed, use the observation system to collect an image of the scattered light reflected by the device under test; S3. The image of the scattered light is transmitted to the processing system, the image data is processed and calculated, the stress spots when the light polarization degree is 0-1 are recorded, the intensity and area of ​​the stress spots are recorded and graded, and the simulation is completed.

8. The method for detecting stress spots in tempered glass according to claim 7, wherein: The preparations before testing in S1 include: S11. Calculate the incident angle i of the scattered light θ , and select the degree of polarization; S12. Clean the glass to be tested so that the light transmittance and transparency of the glass to be tested are not affected; S13. Place the glass to be tested above the shading curtain so that the shading curtain covers the back of the glass to be tested.

9. The method for detecting stress spots in tempered glass according to claim 8, wherein: The process of using the observation system to collect an image of the scattered light reflected by the device under test in S2 is as follows: S21, adjusting the shooting angle and polarization degree by using an angle ruler and a polarizing plate group so that the shooting angle and the incident angle of the angular scattered light with respect to the central axis of the glass are the same; S22. Use a high-speed industrial camera to capture the position where the scattered light shines on the glass to be tested, with the shooting range covering the entire glass to be tested, to obtain a square photo.

10. The method for detecting stress spots in tempered glass according to claim 9, wherein: The process of S3 is: S31, transmitting the square photo data obtained in S22 to the host computer via a data transmission line; S32, the image processing software in the host computer calculates the square photo data to obtain the stress spot intensity and area at this time; S33. Record and classify the stress spots according to their intensity and area, completing the detection.

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