System and method for measuring glass thickness by using spectral confocal principle

Abstract

The invention discloses a method for measuring the thickness of glass by using a spectral confocal principle, which comprises the following steps of: constructing a spectral confocal thickness measurement model, and acquiring reflection wavelength data values corresponding to focal positions respectively formed on the upper surface and the lower surface of the glass; according to the one-to-one correspondence linear relation between the incident wavelength or the reflection wavelength and the focus positions, the reflection wavelength data values corresponding to the focus positions of the upper surface and the lower surface of the glass are converted into focus values respectively, the difference value between the two focus values is calculated, and the thickness value of the measured glass is determined; and transmitting the determined thickness value of the glass to a data output feedback system. According to the invention, the interference of manual measurement can be reduced, so that the precision of measuring the thickness of the glass can be improved, and the method has wide application prospect and value in the glass manufacturing and processing process.

Description

Technical Field

[0001] The present invention relates to the technical field of glass thickness measurement, and particularly to a system and method for measuring the thickness of glass by using the principle of spectral confocal. Background Art

[0002] With the gradual realization of the automation process of industrial production, more and more technological processes are changing from manual to automated and intelligent. In the process of the production of float glass and rolled glass, quality inspection is an essential key step. Usually, the thickness detection of glass is realized by manual measurement. The disadvantages of this measurement method are that it consumes labor, has poor timeliness, and low repeated accuracy. The purpose of this invention patent is to provide a complete set of systematic theoretical basis and an implementable and expandable implementation method for the online measurement of float glass and rolled glass by using the principle of spectral confocal. Summary of the Invention

[0003] The purpose of the present invention is to provide a system and method for measuring the thickness of glass by using the principle of spectral confocal, which is used to solve the problem of poor thickness detection effect of glass in the prior art.

[0004] The purpose of the present invention can be realized by the following technical solutions:

[0005] A method for measuring the thickness of glass by using the principle of spectral confocal includes the following steps:

[0006] S10. Construct a spectral confocal thickness measurement model, and obtain the reflection wavelength data values corresponding to the focal positions formed on the upper surface and the lower surface of the glass respectively;

[0007] S20. According to the one-to-one correspondence linear relationship between the incident wavelength or the reflection wavelength and the focal position, by converting the reflection wavelength data values corresponding to the focal positions on the upper surface and the lower surface of the glass into focal values respectively, and calculating the difference between the two focal values, determine the thickness value of the measured glass;

[0008] S30. Transmit the determined thickness value of the glass to the data output feedback system.

[0009] As a further scheme of the present invention: the method is applied to measure the thickness of float glass or rolled glass.

[0010] As a further scheme of the present invention: the method for constructing the spectral confocal thickness measurement model in step S10 is as follows: the white light emitted by the light source is dispersed by the dispersion mirror into a continuous coaxial spectral band with different wavelengths from red to purple, and its wavelength length gradually decreases from 625 - 440 nm. When the spectral bands with different wavelength lengths irradiate on the glass surface, they will be reflected back to the reflecting mirror, and the reflecting mirror refracts the spectrum towards the aperture mirror;

[0011] Among them, when the focus of the incident light with a specific wavelength is exactly located on the surface of the glass to be measured, the reflected light of this wavelength will be reflected back to the hole mirror at a perpendicular angle;

[0012] When the distance of the light source focus remains unchanged, the focus positions formed by lights of different wavelengths on the glass surface are also different, and there is a one-to-one linear relationship between these focus positions and the corresponding wavelengths.

[0013] As a further solution of the present invention: the method for obtaining the reflected wavelength data values corresponding to the focus positions formed on the upper and lower surfaces of the glass in step S10 is as follows: when measuring the thickness of float glass or rolled glass, the reflected wavelength data values passing through the hole mirror are obtained by a spectral confocal sensor, and the reflected wavelength data values are respectively collected corresponding to the focus positions formed on the upper and lower surfaces of the glass.

[0014] As a further solution of the present invention: when measuring the thickness of rolled glass, there are multiple samples of the reflected wavelength data values obtained by the spectral confocal sensor, and the multiple reflected wavelength data values are subjected to data optimization processing to make the reflected wavelength data values after data optimization processing have higher accuracy.

[0015] As a further solution of the present invention: the method for performing data optimization processing on multiple reflected wavelength data values is as follows: the multiple obtained reflected wavelength data values are averaged, and the data higher or lower than the average value are screened out.

[0016] As a further solution of the present invention: when determining the thickness value of the measured glass in step S20, the thickness values determined by multiple operations are subjected to data optimization processing to make the thickness values after data optimization processing have higher accuracy.

[0017] As a further solution of the present invention: the method for performing data optimization processing on the thickness values determined by multiple operations is as follows: the thickness values determined by multiple operations are averaged, and the data higher or lower than the average value are screened out.

[0018] As a further solution of the present invention: when transmitting the determined thickness value of the glass to the data output feedback system in step S30, the data output feedback system displays the thickness value on the display terminal and outputs it as a feedback quantity to the control system of the glass production line; in addition, the data output feedback system controls the upper and lower limits of the thickness value, and triggers an alarm signal when the measured thickness value exceeds the range.

[0019] A system for measuring the thickness of glass using the spectral confocal principle, comprising:

[0020] A collection module for collecting and obtaining the reflected wavelength data values corresponding to the focus positions formed on the upper and lower surfaces of the glass;

[0021] A calculation module, configured to convert the reflection wavelength data values corresponding to the focal positions on the upper and lower surfaces of the glass into focal values respectively, calculate the difference between the two focal values, and determine the thickness value of the measured glass;

[0022] An output module, configured to output the thickness value of the measured glass determined by the calculation module to a data output feedback system, where the data output feedback system includes a display module, an alarm module, and an output feedback module. The display module is configured to display the thickness value on a display terminal. The alarm module is configured to control the upper and lower limits of the thickness value. When the measured thickness value exceeds the range, an alarm signal is triggered. The output feedback module is configured to output the thickness value as a feedback quantity to the control system of the glass production line;

[0023] Wherein, when measuring the thickness of rolled glass, a filtering processing module is arranged between the collection module and the calculation module, and / or a filtering value processing module is arranged between the calculation module and the output module. The filtering processing module is configured to perform data optimization processing on the reflection wavelength data values, and the filtering value processing module is configured to perform data optimization processing on the thickness values.

[0024] Advantages of the present invention:

[0025] (1) During the use of this system or method, the spectral confocal principle is utilized to provide a theoretical basis, operability, and scalability for the on-line measurement of float or rolled glass;

[0026] (2) When measuring the thickness of rolled glass, data optimization processing is performed. The data optimization processing includes two processes of filtering and / or filtering value, which improves the accuracy and reliability of the data and provides strong support for subsequent glass thickness measurement and production monitoring;

[0027] (3) When determining the thickness value of the glass and transmitting it to the data output feedback system, it has a display terminal display function, a range control alarm function, and a glass production end feedback function, which can achieve precise measurement and feedback control of the glass thickness and provide strong support for the quality control and production efficiency of the glass production line;

[0028] (4) This application can reduce the intervention of manual measurement, thereby improving the accuracy of glass thickness measurement and having broad application prospects and value in the glass manufacturing and processing process. Description of the Drawings

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 is a flowchart of the method for measuring the thickness of glass using the spectral confocal principle of the present invention;

[0031] Figure 2 It is a schematic diagram of constructing a spectral confocal thickness measurement model for float glass in the method for measuring the thickness of glass by using the spectral confocal principle of the present invention;

[0032] Figure 3 It is a schematic diagram of constructing a spectral confocal thickness measurement model for rolled glass in the method for measuring the thickness of glass by using the spectral confocal principle of the present invention;

[0033] Figure 4 It is a framework diagram of the system for measuring the thickness of glass by using the spectral confocal principle of the present invention. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention; in the description of the present invention, the meanings of "a plurality" and "several" are at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] The present invention is a method for measuring the thickness of glass by using the spectral confocal principle. This method is applied to measure the thickness of float glass or rolled glass, so that this method has advantages such as high precision, non-contact measurement, fast response and efficient measurement, and wide applicability. These advantages provide a theoretical basis for the online measurement of float or rolled glass and have operability and expandability, and have broad application prospects and value.

[0037] As Figure 1 shown, the method for measuring the thickness of glass by using the spectral confocal principle includes the following steps:

[0038] S10. Construct a spectral confocal thickness measurement model and obtain the reflection wavelength data values corresponding to the focal positions formed on the upper surface and the lower surface of the glass respectively.

[0039] As Figure 2As shown in the figure, the method for constructing a spectral confocal thickness measurement model is as follows: The white light emitted by the light source is dispersed by a dispersion mirror into a continuous coaxial spectral band with different wavelengths from red to violet, and its wavelength length gradually decreases from 625 - 440 nm. When the spectra with different wavelength lengths irradiate on the glass surface, they will be reflected back to the reflecting mirror, and the reflecting mirror refracts the spectra towards the aperture mirror. Among them, when the focus of a specific wavelength of incident light exactly lies on the surface of the glass to be measured, the reflected light of this wavelength will be reflected back to the aperture mirror at a perpendicular angle, and the light of the remaining wavelengths will be blocked by the aperture mirror due to their different focus positions. When the distance of the light source focus remains unchanged, the focus positions formed by the light of different wavelengths on the glass surface are also different, and there is a one-to-one linear relationship between these focus positions and the corresponding wavelengths.

[0040] The method for obtaining the reflection wavelength data values corresponding to the focus positions formed on the upper and lower surfaces of the glass in this step is as follows: When measuring the thickness of float glass or rolled glass, the reflection wavelength data values are obtained through a spectral confocal sensor, and the reflection wavelength data values are respectively collected corresponding to the focus positions formed on the upper and lower surfaces of the glass.

[0041] S20. According to the one-to-one linear relationship between the incident wavelength or the reflection wavelength and the focus position, by respectively converting the reflection wavelength data values corresponding to the focus positions on the upper and lower surfaces of the glass into focus values, and calculating the difference between the two focus values, the thickness value of the measured glass is determined.

[0042] S30. Transmit the determined thickness value of the glass to the data output feedback system.

[0043] When this method is applied to measure the thickness of float glass, because the upper and lower surfaces of float glass are smooth, the method of steps S10 to S30 can be directly used to measure the thickness of float glass. By using the constructed spectral confocal thickness measurement model, two beams of wavelength reflected light with higher intensities can be received at the aperture mirror position, so as to facilitate obtaining the reflection wavelength data values passing through the aperture mirror through the spectral confocal sensor. According to the one-to-one linear relationship between the focus position and the corresponding wavelength, one beam of reflection wavelength data value corresponds to the focus value of the focus position on the upper surface of the glass, and the other beam of reflection wavelength data value corresponds to the focus value of the focus position on the lower surface of the glass. Furthermore, the difference between the two focus values can be calculated to determine the thickness value of the measured glass.

[0044] When this method is applied to measure the thickness of rolled glass, as Figure 3 shown, due to the uneven patterns on the surface of rolled glass, the reflection angles of some reflected light are different, such as Figure 3 the incident / reflected light D mediated, which may be mis-collected, resulting in floating output results and inaccurate data. Therefore, when applying to measure the thickness of rolled glass, data optimization processing is required, and the data optimization processing includes two processing processes: filtering and / or value filtering.

[0045] When performing filtering data optimization processing on the obtained reflected wavelength data values, there are multiple samples of reflected wavelength data values obtained through a spectral confocal sensor passing through a pore mirror. The multiple reflected wavelength data values are subjected to data optimization processing to make the reflected wavelength data values after data optimization processing have higher accuracy. The method for performing data optimization processing on the multiple reflected wavelength data values is: performing an average value processing on the obtained multiple reflected wavelength data values, and screening out the data higher or lower than the average value.

[0046] When performing filtering value data optimization processing on the determined thickness value, the thickness values determined through multiple operations are subjected to data optimization processing to make the thickness values after data optimization processing have higher accuracy. The method for performing data optimization processing on the thickness values determined through multiple operations is: performing an average value processing on the thickness values determined through multiple operations, and screening out the data higher or lower than the average value.

[0047] Through the workflow of data optimization processing, the optimization processing of the reflected light data of calendered glass can be realized, improving the accuracy and reliability of the data, and providing strong support for subsequent glass thickness measurement and production monitoring.

[0048] In this specific embodiment, when transmitting the determined thickness value of the glass to the data output feedback system, the data output feedback system displays the thickness value on the display terminal. The display terminal, such as a host computer or a local display screen, determines the display of the thickness value of the glass. The thickness value can send the processed data to the display terminal through a data communication interface (such as RS232, RS485, Ethernet, etc.). After receiving the data, the display terminal parses and displays it.

[0049] The thickness value can be output as a feedback quantity to the control system of the glass production line. The system provides one or more output terminals (such as analog output, digital output, etc.), and outputs the glass thickness value to the control system of the glass production line in the form of an electrical signal. The control system adjusts the production parameters according to this feedback quantity to achieve precise control of the glass thickness.

[0050] The data output feedback system performs range control on the upper and lower limits of the thickness value. When the measured and determined thickness value exceeds the range, an alarm signal is triggered. The alarm signal can inform the operator in ways such as audible and visual alarms, display screen prompts, etc.

[0051] It should be understood that the transmission of the thickness value to the data output feedback system has scalability. When designing the system, the future expansion requirements are considered, and interfaces and expansion spaces are reserved so as to add new functions or integrate with other systems when needed.

[0052] Such as Figure 4As shown, the present invention also provides a system for measuring the thickness of glass using the principle of spectral confocal, including a collection module, a calculation module, and an output module. The collection module is used to collect the reflection wavelength data values corresponding to the focal positions formed on the upper and lower surfaces of the glass respectively. The calculation module is used to convert the reflection wavelength data values corresponding to the focal positions on the upper and lower surfaces of the glass into focal values respectively, and calculate the difference between the two focal values to determine the thickness value of the measured glass. The output module is used to output the thickness value of the measured glass determined by the calculation module to the data output feedback system. The data output feedback system includes a display module, an alarm module, and an output feedback module. The display module is used to display the thickness value on the display terminal. The alarm module is used to control the upper and lower limits of the thickness value. When the measured thickness value exceeds the range, an alarm signal is triggered. The output feedback module is used to output the thickness value as a feedback quantity to the control system of the glass production line.

[0053] Among them, when measuring the thickness of rolled glass, a filtering processing module is provided between the collection module and the calculation module, and / or a filtering value processing module is provided between the calculation module and the output module. The filtering processing module is used to optimize and process the reflection wavelength data values, and the filtering value processing module is used to optimize and process the thickness values.

[0054] The working principle of this system is the same as that of the above method, so it will not be elaborated here.

[0055] During the use of this system or this method, the principle of spectral confocal provides a theoretical basis, operability, and scalability for the on-line measurement of float glass or rolled glass. When measuring the thickness of rolled glass, data optimization processing is carried out, and the data optimization processing includes two processes of filtering and / or filtering value, which improves the accuracy and reliability of the data and provides strong support for subsequent glass thickness measurement and production monitoring. When determining the thickness value of the glass and transmitting it to the data output feedback system, it has a display terminal display function, a range control alarm function, and a feedback function at the end of glass production, which can achieve precise measurement and feedback control of the glass thickness and provide strong support for the quality control and production efficiency of the glass production line. This application can reduce the intervention of manual measurement, thereby improving the accuracy of glass thickness measurement and has broad application prospects and value in the glass manufacturing and processing process.

[0056] The above has described a specific embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. A method for measuring glass thickness using the spectral confocal principle, characterized in that: The following steps are involved: S10, constructing a spectral confocal thickness measurement model, and obtaining reflection wavelength data values ​​corresponding to the focal positions formed on the upper and lower surfaces of the glass respectively; S20, according to the one-to-one linear relationship between the incident wavelength or the reflected wavelength and the focal position, by converting the reflected wavelength data values ​​corresponding to the focal positions of the upper and lower surfaces of the glass into focal values ​​respectively, and calculating the difference between the two focal values, to determine the thickness value of the measured glass; S30, transmitting the determined glass thickness value to a data output feedback system.

2. The method for measuring glass thickness using the spectral confocal principle according to claim 1, characterized in that: The method is applied to measuring the thickness of float glass or rolled glass.

3. The method for measuring glass thickness using the spectral confocal principle according to claim 2, characterized in that: The method for constructing the spectral confocal thickness measurement model in step S10 is as follows: the white light emitted by the light source is dispersed into continuous coaxial spectral bands of different wavelengths from red to purple through a dispersion mirror, and the wavelength length thereof gradually decreases from 625-440 nm. When the spectra of different wavelength lengths are irradiated on the glass surface, they are reflected back to the reflector, and the reflector refracts the spectra toward the aperture mirror; Among them, when the focus of incident light of a certain wavelength happens to be on the surface of the glass being measured, the reflected light of this wavelength will be reflected back to the aperture mirror at a vertical angle; When the focal distance of the light source remains unchanged, the focal positions formed on the glass surface by light of different wavelengths are also different, and there is a one-to-one linear relationship between these focal positions and the corresponding wavelengths.

4. The method for measuring glass thickness using the spectral confocal principle according to claim 3, characterized in that: The method for obtaining the reflection wavelength data values ​​corresponding to the focal positions formed on the upper surface and the lower surface of the glass in step S10 is: when measuring the thickness of float glass or rolled glass, the reflection wavelength data values ​​through the hole mirror are obtained by the spectral confocal sensor, and the reflection wavelength data values ​​are collected from the focal positions formed on the upper surface and the lower surface of the glass respectively.

5. The method for measuring glass thickness using the spectral confocal principle according to claim 4, characterized in that: When measuring the thickness of rolled glass, a plurality of samples of reflection wavelength data values ​​transmitted through the aperture mirror are obtained by the spectral confocal sensor, and the plurality of reflection wavelength data values ​​are subjected to data optimization processing so that the reflection wavelength data values ​​after data optimization processing have higher accuracy.

6. The method for measuring glass thickness using the spectral confocal principle according to claim 5, characterized in that: The method for performing data optimization processing on multiple reflection wavelength data values ​​is: performing average processing on the obtained multiple reflection wavelength data values, and filtering out data that is higher or lower than the average value.

7. The method for measuring glass thickness using the spectral confocal principle according to claim 6, characterized in that: When determining the thickness value of the measured glass in step S20, the thickness value determined by multiple calculations is subjected to data optimization processing, so that the thickness value after the data optimization processing has higher accuracy.

8. The method for measuring glass thickness using the spectral confocal principle according to claim 7, characterized in that: The method for performing data optimization processing on the thickness values ​​determined by multiple calculations is: performing average processing on the thickness values ​​determined by multiple calculations, and filtering out data that is higher or lower than the average.

9. The method for measuring glass thickness using the spectral confocal principle according to claim 8, characterized in that: When the determined glass thickness value is transmitted to the data output feedback system in step S30, the data output feedback system displays the thickness value on the display terminal and outputs it as a feedback quantity to the control system of the glass production line; in addition, the data output feedback system performs range control on the upper and lower limits of the thickness value, and triggers an alarm signal when the measured thickness value exceeds the range.

10. A system for measuring glass thickness using the spectral confocal principle, characterized in that: include: A collection module, used to collect and obtain the reflection wavelength data values ​​corresponding to the focus positions formed on the upper surface and the lower surface of the glass respectively; A calculation module, used to convert the reflection wavelength data values ​​corresponding to the focal positions of the upper and lower surfaces of the glass into focal values, and calculate the difference between the two focal values ​​to determine the thickness value of the measured glass; An output module, used to output the thickness value of the measured glass determined by the calculation module to a data output feedback system, wherein the data output feedback system includes a display module, an alarm module and an output feedback module, wherein the display module is used to display the thickness value on a display terminal, the alarm module is used to perform range control on the upper and lower limits of the thickness value, and an alarm signal is triggered when the thickness value determined by the measurement exceeds the range, and the output feedback module is used to output the thickness value as a feedback amount to a control system of the glass production line; Wherein, when measuring the thickness of rolled glass, a filtering processing module is set between the collection module and the calculation module, and / or a filtering value processing module is set between the calculation module and the output module, the filtering processing module is used for data optimization processing of the reflection wavelength data value, and the filtering value processing module is used for data optimization processing of the thickness value.

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