CN111076855A - Glass stress detection device - Google Patents
Glass stress detection device Download PDFInfo
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- CN111076855A CN111076855A CN201911384494.7A CN201911384494A CN111076855A CN 111076855 A CN111076855 A CN 111076855A CN 201911384494 A CN201911384494 A CN 201911384494A CN 111076855 A CN111076855 A CN 111076855A
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- analyzer
- light source
- polarizer
- glass
- sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N2021/216—Polarisation-affecting properties using circular polarised light
Abstract
The invention provides a glass stress detection device which comprises a horizontal workbench, a light source, a polarizer, a polarization analyzer and a camera element, wherein a support frame is vertically arranged on the horizontal workbench, the light source is arranged on the horizontal workbench, the polarizer is positioned above the light source, the glass stress detection device is characterized in that an 1/4 wave plate is arranged above the polarizer, a sample station is arranged above the 1/4 wave plate and is used for bearing a sample to be detected, the polarization analyzer is arranged on the support frame through a fixing frame, a driving motor is also fixedly arranged on a fixing seat and is used for driving the polarization analyzer to rotate, the camera element is fixedly arranged above the polarization analyzer and is connected with an image processing element, and the image processing element is connected with the polarization analyzer driving motor and is used for controlling the rotation of the polarization analyzer. The device can directly acquire the stress value of the whole area of the glass sample, and solves the technical problem of low measurement efficiency in single-point measurement in the prior art.
Description
Technical Field
The invention relates to a stress detection device, in particular to a glass stress detection device.
Background
The use frequency of transparent products such as common glass, organic glass, PET plastics and the like in the optical field is gradually increased, due to the particularity of the production process, the products need to be subjected to a corresponding annealing process when being formed, the quality of the annealing process directly determines the strength and the service life of the products, residual internal stress is generated in the products due to nonuniform or incomplete uniform annealing, the residual internal stress is usually extremely nonuniform, the mechanical strength and the thermal stability of the glass products can be reduced, the safe use of the glass products is influenced, and when the residual internal stress value exceeds the limit, the products can even have the self-explosion phenomenon. Particularly, with the rapid development of the touch industry, the specification requirements of touch products are becoming more and more strict, and since the touch panel is operated by applying pressure from the outside to perform the operation of the sensing element, the touch panel can achieve the use effect, the mechanical pressure resistance of the touch panel is an important specification and index for various manufacturers. For optical glass, the surface of a processed optical part can slowly deform along with time due to the existence of residual internal stress, so that the imaging quality is seriously influenced, and the size of the residual internal stress also becomes one of important indexes of the optical performance of the optical glass. Therefore, in order to ensure the service performance of the glass product, the residual internal stress of the glass needs to be controlled within a reasonable range, and the residual internal stress of the glass needs to be detected.
At present, the internal stress detection mostly adopts a manual rotating dial and a human eye observation mode, the human factors are more, the judgment of the detection result is easily influenced, and although the automatic stress detector is arranged in the prior art, the efficiency is improved to a certain extent compared with the manual operation, the automatic stress detector can only carry out single-point measurement on a glass sample, the stress of the whole sample cannot be measured at one time, and the efficiency is lower.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a method which has high efficiency and high precision, can comprehensively measure the stress of a glass sample at one time, can output a 3D distribution image, can carry out measurement by selecting different areas, and can store the measurement result in the form of data and pictures so as to facilitate the analysis and reproduction of subsequent data.
The specific technical scheme of the invention is as follows:
the utility model provides a glass stress detection device, includes horizontal table, light source, polarizer, analyzer and camera element, and the last vertical support frame that is provided with of horizontal table, light source setting are on horizontal table, and the polarizer is located the light source top, its characterized in that, the polarizer top is provided with 1/4 wave plates, 1/4 wave plate top is the sample station, and the sample station is used for bearing the glass sample that awaits measuring, and the analyzer establishes through the fixed bolster on the support frame, still fixed being provided with driving motor on the fixing base, driving motor is used for driving the analyzer rotation, the fixed erections of camera element are in the analyzer top, are connected with image processing component, and image processing component and analyzer driving motor are connected with the rotation of control analyzer.
Further, the rotation angles of the analyzer are respectively 0 °, 45 °, 90 ° and 135 °, and when the rotation angle is 0 °, the polarization axes of the analyzer and the polarizer are perpendicular to each other.
Further, the camera shooting element is a CCD camera, and the front end of the CCD camera is provided with an optical filter.
Further, the light source is a monochromatic LED area light source.
Further, the analyzer and the camera element can be adjusted in distance relative to the sample station.
The invention discloses a glass stress detection device, which is characterized in that a light source, a polarizer, an 1/4 wave plate, a sample station, a polarization analyzer and a camera element are sequentially arranged on a light path of the glass stress detection device, when in use, a glass sample is placed on the sample station, light emitted by the light source is converted into linearly polarized light through the polarizer, the linearly polarized light is converted into circularly polarized light through the 1/4 wave plate, the circularly polarized light is decomposed into two beams of polarized light with optical path difference and mutually vertical polarization directions due to residual internal stress in the glass sample after passing through a sample to be detected, a driving motor drives the polarization analyzer to rotate and respectively rotate by 0 degree, 45 degrees, 90 degrees and 135 degrees, the camera element above the polarization analyzer respectively shoots images of the polarization analyzer rotating by 0 degree, 45 degrees, 90 degrees and 135 degrees, then the shot images are respectively transmitted to an image processing element, and the image processing element respectively collects, and calculating the stress in the glass according to the captured image brightness information. The device of the invention obtains linearly polarized light through the polarizer, then the circularly polarized light split by the 1/4 wave plate is incident into the glass sample to be detected, the analyzer rotates four angles to respectively record the brightness information of the glass sample image at the four specific angles, thereby measuring the stress value and the stress 3D distribution of the whole shooting area of the glass to be detected, and solving the technical problems of low measurement efficiency and large measurement error existing in single-point measurement in the prior art.
Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic optical diagram of an embodiment of a glass stress detection apparatus of the present invention;
FIG. 2 is a schematic view of a glass stress detection apparatus according to the present invention, also a schematic view of a preferred embodiment;
FIG. 3 is a schematic optical diagram of another embodiment of the glass stress detection apparatus of the present invention;
FIG. 4 is a diagram showing the experimental effect of the glass stress detection apparatus according to the present invention;
the device comprises a light source 1, a polarizer 2, an 1/4 glass slide 3, a sample 4, a polarization analyzer 5, a camera element 6, a driving motor 7, a horizontal workbench 8, a support frame 9, a sample station 10, a fixing seat 11, a housing 12, an image processing element 13 and a polarization camera 14.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention.
In the description of the present invention, it should be noted that the terms "above", "below", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
FIG. 1 shows an optical schematic diagram of a glass stress detection device of the present invention, in the device, a light source 1, a polarizer 2, a 1/4 wave plate 3, a sample 4, an analyzer 5, and a camera element 6 are sequentially arranged on an optical path of the glass stress detection device of the present invention, when in use, the sample 4 is placed on a sample station 10, light emitted by the light source 1 is changed into linearly polarized light by the polarizer 2, the linearly polarized light is changed into circularly polarized light by the 1/4 wave plate 3, wherein a slow axis of the wave plate forms + -45 degrees with the polarizer, the sample 4 is internally decomposed into two beams of polarized light with optical path difference and mutually perpendicular polarization directions due to residual internal stress, the circularly polarized light passes through the sample 4 to be detected, a driving motor 7 drives the analyzer 5 to rotate, and respectively rotate 0 degree, 45 degrees, 90 degrees, and 135 degrees, and the camera element 6 above the analyzer 5 respectively rotates 0 degree and 135 degrees to, The images at 45 °, 90 ° and 135 ° are captured, and then the captured images are respectively transmitted to the image processing element 13, the image processing element 13 respectively collects the image brightness information at the four specific angles, and calculates the stress in the glass sample according to the captured image brightness information.
Fig. 2 is a schematic structural diagram of an embodiment of the glass stress detection device of the present invention, which is also a schematic diagram of a preferred embodiment. The glass stress detection device in the embodiment comprises a horizontal workbench 8, a light source 1, a polarizer 2, a polarization analyzer 5 and a camera element 6, wherein a support frame 9 is vertically arranged on the horizontal workbench 8, the light source 1 is arranged on the horizontal workbench 8, the polarizer 2 is positioned above the light source 1, an 1/4 wave plate 3 is arranged above the polarizer 2, a sample station 10 is arranged above the 1/4 wave plate 3, the sample station 10 is used for bearing a sample 4 to be detected, the polarization analyzer 5 is erected on the support frame 9 through a fixed seat 11, a driving motor 7 is also fixedly arranged on the fixed seat 11, the driving motor 7 is used for driving the polarization analyzer 5 to rotate, the camera element 6 is fixedly erected above the polarization analyzer 5 and is connected with an image processing element 13, the image processing element 13 is connected with the driving motor 7 to control the rotation of the polarization analyzer 5, and during the rotation of the polarization analyzer 5, the drive motor 7 can register its rotation angle by means of an encoder. The image pickup device 6 in this embodiment is preferably a CCD camera, and the front end of the CCD camera is provided with a filter, and preferably, the image processing device 13 in this embodiment is a general-purpose computer with data processing software.
Preferably, the rotation angles of the analyzer 5 are 0 °, 45 °, 90 °, and 135 °, and the rotation angles are 0 °, the polarization axes of the analyzer 5 and the polarizer 2 are perpendicular to each other, during the measurement, the image processing element 13 controls the operation state of the driving motor 7 according to the collection condition of the image brightness, and after the collection of the image brightness information is completed, the image processing element 13 controls the driving motor 7 to start up, so as to drive the analyzer 5 to rotate at the next angle. The light source 1 is a light source capable of emitting monochromatic light with a central wavelength, and preferably a monochromatic LED surface light source, which can eliminate the influence of light with other wavelengths, so that the image pickup device can capture a relatively clear image.
In the present embodiment, in order to avoid the influence of other unnecessary stray light on the measurement accuracy of the present invention, the cover 12 is covered outside the glass stress detection device in the present embodiment, so as to ensure that the device is used without influence in a dark operating environment, thereby improving the operation convenience of the stress meter of the present invention.
Furthermore, the analyzer 5 and the camera element 6 can be adjusted in distance relative to the sample station 10, so that when the device of the present invention is used, an operator can properly adjust the positions of the analyzer 5 and the camera element 6 according to the specific situation of the sample to be measured, so that the camera element 6 can capture a relatively clear image, and the measurement accuracy of the device of the present invention is improved.
More specific implementation modes of the invention are specifically developed as follows:
as an embodiment of the invention, the light source 1 selects an LED area light source with a central wavelength of 590nm, before measuring the internal stress of the glass, an operator firstly calibrates, the driving motor 7 controls the analyzer 5 to rotate by 0 degree, 45 degree, 90 degree and 135 degree respectively, a background image of a corresponding rotation angle is shot, then the sample 4 to be measured is placed on the sample station 10 for stress detection, the shading cover 12 needs to be pulled down in the stress detection process to avoid the influence of the environmental light on the test result, the light emitted by the light source 1 is changed into circular polarized light after passing through the polarizer 2 and the 1/4 wave plate 3, due to the stress in the glass sample, the polarized light is decomposed into two beams of polarized light with optical path difference and mutually vertical polarization directions after passing through the glass to be measured with stress, the driving motor 7 drives the analyzer 5 to rotate, so that the polarization axes of the analyzer 5 and the polarizer 2 are arranged at different angles, therefore, the image pickup element 6 above the analyzer 5 can capture images with different brightness information, and then the captured images are transmitted to the image processing element 13, the image processing element 13 performs calculation of the internal stress of the glass according to the captured image brightness information, in this embodiment, the image pickup element 6 can capture images with brightness information of different surfaces by controlling the incident sample 4 to be circularly polarized light and matching with the rotation of the analyzer 5, thereby realizing the effect of measuring the stress value size of the whole shooting area of the glass sample to be measured and the stress 3D distribution thereof, and solving the technical problems of low measurement efficiency and large measurement error existing in single-point measurement in the prior art.
Further, in this embodiment, when the rotation angle of the analyzer 5 is 0 °, the polarization axes of the analyzer 5 and the polarizer 2 are perpendicular to each other, the image pickup device 6 above the analyzer 5 captures the image at that time, and then transmits the captured image to the image processing device 13, the image processing device 13 collects brightness information of the captured image, after the collection, a corresponding instruction is sent to control the driving motor 7 to start up, the analyzer 5 is driven to rotate at a preset angle of 45 °, when the analyzer 5 rotates to a predetermined position, the driving motor 7 stops working, the analyzer 5 stops rotating, the image pickup device 6 captures the image at that time, and transmits the captured image to the image processing device 13, and the image processing device 13 collects the received brightness information of the image, and so on, the driving motor 7 drives the analyzer 5 to sequentially perform the operations of 0 °, 45 °, 90 °, and so on, A rotation of 135 deg..
As shown in fig. 3 as another embodiment of the present invention, in this embodiment, a light source 1, a polarizer 2, 1/4 wave plate 3, a sample 4, and a polarization camera 14 are sequentially arranged on an optical path, natural light emitted by the light source 1 is changed into linearly polarized light through the polarizer 2, and then changed into circularly polarized light through the 1/4 wave plate 3, wherein a slow axis of the wave plate forms ± 45 ° with the polarizer, and the circularly polarized light is decomposed into two beams of polarized light having optical path differences and mutually perpendicular polarization directions after passing through the sample 4 due to residual internal stress inside the sample 4, and image information at this time is collected through the polarization camera 14, and the polarization camera 14 can simultaneously obtain images in four polarization directions of 0 °, 45 °, 90 °, and 135 ° at a time. This embodiment is through saving analyzer and driving motor, has further reduced the error that analyzer and driving motor rotation angle brought to the measurement, and the precision is higher, and is simpler in structure, more saves space, can be with the more miniaturization of stress detection device.
The glass stress detection device is further tested, the effect is shown in fig. 4, 1/4 wave plate with the wavelength of 266nm is selected as a detection sample, after the glass slide for detection is placed at the sample station of the glass stress detection device, the maximum stress of the glass slide is 2.78MPa, the maximum optical path difference is 67.2nm, and the actual optical path difference of the sample is 66.5nm, so that the measurement precision of the glass stress detection device is within 1nm, which cannot be easily achieved by the prior art.
Any reference in this specification to "the present embodiment," "one embodiment," "another embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. This schematic representation in various places throughout this specification does not necessarily refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
While specific embodiments of the invention have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. In particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention. Except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a glass stress detection device, includes horizontal table, light source, polarizer, analyzer and camera shooting component, the last vertical support frame that is provided with of horizontal table, the light source setting is on horizontal table, and the polarizer is located the light source top, its characterized in that, the polarizer top is provided with 1/4 wave plates, 1/4 wave plate top is the sample station, and the sample station is used for bearing the sample that awaits measuring, the analyzer establishes through the fixed seat on the support frame, still fixed being provided with driving motor on the fixing base, driving motor is used for driving the analyzer rotatory, the fixed erections of camera shooting component are in the analyzer top, are connected with image processing component, and image processing component is connected with analyzer driving motor, is used for controlling the rotation of analyzer.
2. The glass stress detection device according to claim 1, wherein the rotation angles of the analyzer are 0 °, 45 °, 90 °, 135 °, and the polarization axes of the analyzer and the polarizer are perpendicular to each other when the rotation angles are 0 °.
3. The glass stress detection device according to claim 1, wherein the image pickup element is a CCD camera, and a filter is provided at a front end of the CCD camera.
4. The glass stress detection device according to claim 1, wherein the light source is a monochromatic LED surface light source.
5. The glass stress detection apparatus of claim 1, wherein the analyzer and the imaging element are adjustable in distance relative to the sample station.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911384494.7A CN111076855A (en) | 2019-12-28 | 2019-12-28 | Glass stress detection device |
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| CN201911384494.7A CN111076855A (en) | 2019-12-28 | 2019-12-28 | Glass stress detection device |
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| CN111076855A true CN111076855A (en) | 2020-04-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610198A (en) * | 2020-06-01 | 2020-09-01 | 上海御微半导体技术有限公司 | Defect detection device and method thereof |
| CN112964409A (en) * | 2021-02-06 | 2021-06-15 | 中国工程物理研究院激光聚变研究中心 | Vacuum stress tester for large-caliber optical element |
| CN113074848A (en) * | 2021-06-07 | 2021-07-06 | 中国矿业大学(北京) | Optical elasticity testing system and method based on optical amplification technology |
| CN114136515A (en) * | 2021-10-25 | 2022-03-04 | 湖北光锐鑫光电科技有限公司 | Optical glass stress measuring device and measuring method thereof |
| CN114755111A (en) * | 2022-06-16 | 2022-07-15 | 中国科学院深海科学与工程研究所 | Stress measurement test device under ultrahigh pressure of deep sea material |
| CN115077755A (en) * | 2022-06-14 | 2022-09-20 | 秦皇岛玻璃工业研究设计院有限公司 | Glass production line cold end stress detection system and glass stress detection method |
-
2019
- 2019-12-28 CN CN201911384494.7A patent/CN111076855A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610198A (en) * | 2020-06-01 | 2020-09-01 | 上海御微半导体技术有限公司 | Defect detection device and method thereof |
| CN112964409A (en) * | 2021-02-06 | 2021-06-15 | 中国工程物理研究院激光聚变研究中心 | Vacuum stress tester for large-caliber optical element |
| CN113074848A (en) * | 2021-06-07 | 2021-07-06 | 中国矿业大学(北京) | Optical elasticity testing system and method based on optical amplification technology |
| CN114136515A (en) * | 2021-10-25 | 2022-03-04 | 湖北光锐鑫光电科技有限公司 | Optical glass stress measuring device and measuring method thereof |
| CN115077755A (en) * | 2022-06-14 | 2022-09-20 | 秦皇岛玻璃工业研究设计院有限公司 | Glass production line cold end stress detection system and glass stress detection method |
| CN114755111A (en) * | 2022-06-16 | 2022-07-15 | 中国科学院深海科学与工程研究所 | Stress measurement test device under ultrahigh pressure of deep sea material |
| CN114755111B (en) * | 2022-06-16 | 2022-11-25 | 中国科学院深海科学与工程研究所 | Stress measurement test device under ultrahigh pressure of deep sea material |
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