CN117168321B - Axial automatic measuring system for full-width optical film - Google Patents
Axial automatic measuring system for full-width optical film Download PDFInfo
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Abstract
The application relates to the technical field of product breadth measurement, and provides a full-width optical film axial automatic measurement system, which comprises: the linear slide rail motion unit comprises a plurality of movers which are arranged at intervals, each detection module comprises a multi-angle polarizing disc and a light detector, the multi-angle polarizing disc is provided with a plurality of different polarizing shaft angles, the light detector captures gray scale images corresponding to the different polarizing shaft angles of the multi-angle polarizing disc, the light source generates light beams to irradiate the coiled polarizing film to be detected, the light beams irradiate the coiled polarizing film to be detected and then transmit the light beams to the multi-angle polarizing disc to generate gray scale images, the detection host controls the linear slide rail motion unit and the plurality of detection modules, full-width calculation is carried out on the coiled polarizing film to be detected according to the gray scale images captured by the light detector, so that the numerical distribution of the polarizing shaft angles of full-width is obtained, the measurement efficiency is improved, and the measurement angle resolution and the measurement precision are improved.
Description
Technical Field
The application belongs to the technical field of product breadth measurement, and particularly relates to a full-breadth optical film axial automatic measurement system.
Background
Light waves can be classified into natural light and polarized light according to the characteristics of vibration. The natural light has the same amplitude and frequency on each vibration plane perpendicular to the light wave transmission direction, and after reflection, refraction, double refraction, absorption and other actions, the natural light becomes light wave vibrating in one direction only, which is called polarized light, the polarizer refers to an optical element capable of changing the natural light into polarized light, and the vibration direction of the polarized light of the polarizer is called the polarization axis direction (angle) thereof. When the light beam irradiates on the polarizer with a polarization axis placed at a horizontal angle, only light waves with the direction of the horizontal polarization axis are transmitted, and if the light waves pass through the polarizer with the polarization axis placed at a vertical angle, the light waves can not pass through the polarizer, and the view field is completely dark, which is called orthogonal polarization analysis; on the contrary, if the two polarization axes are parallel to each other, namely in the case of parallel polarization analysis, the field of view is the brightest, and if the two polarization axes are at other included angles, the field of view shows moderate brightness. In other words, the vertical projection quantity of the light wave passing through the polarizing axis direction of the first polarizer (the analyzing sheet) and the polarizing axis direction of the second polarizer (the sample to be measured) is the light intensity that can be detected after passing through the two polarizers, so when the sample to be measured is fixed, the analyzing sheet is adjusted to make the analyzing sheet and the sample to be measured take on orthogonal or parallel polarization analysis, and the polarizing axis direction angle of the sample to be measured can be obtained from the polarizing axis direction of the analyzing sheet.
Currently, a measuring device for detecting the azimuth angle of a polarizing axis of a sample to be measured generally includes a light source, a light-separating sheet, the sample to be measured and a light detector, wherein the light source can be a halogen lamp or an LED lamp; the light-separating sheet is a polaroid fixed on the stepping motor and can be driven by the stepping motor to rotate; the sample to be measured is fixed on a sample platform at a fixed angle; the light detector converts the detected light intensity into a voltage signal and transmits the voltage signal to the back-end operation unit for analysis. By adjusting the rotation angle of the stepping motor, the light intensity signal corresponding to the angle can be obtained, when the light intensity signal is adjusted to the lowest point, the situation that the analysis sheet and the sample to be tested are orthogonal to each other is detected, the rotation angle of the stepping motor is recorded, and the azimuth angle of the polarization axis of the sample to be tested can be obtained. The orthogonal deviation analysis measuring mode comprises the following steps: the method comprises the steps of rotating and scanning at a large angle, roughly confirming the angle of the lowest point of the light intensity signal, gradually reducing the rotation angle to scan back, and finally, scanning and confirming the angle of the lowest point of the light intensity signal at the highest angle resolution. Because the motor must scan back and forth multiple times, resulting in long measurement times and angular resolution limited by the step resolution of the motor used; meanwhile, under the condition of orthogonal deviation analysis of the light source, the light intensity received by the light detector is very weak, and if the light detector and the back-end operation unit used cannot distinguish tiny light intensity changes, the measurement result is unstable each time, so that the measurement accuracy is affected.
In summary, the existing product breadth measuring technology has the technical problems of long measuring time, low angle resolution, low measuring precision and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a full-width optical film axial automatic measurement system so as to improve measurement efficiency and measurement angle resolution and measurement accuracy.
The application provides a full width optical film axial automatic measurement system, includes:
the linear slide rail moving unit comprises a plurality of movers which are arranged at intervals, and each mover is used for driving and positioning one detection module;
the system comprises a plurality of detection modules, a plurality of detection modules and a display module, wherein each detection module comprises a multi-angle polarizing disc and a light detector, the multi-angle polarizing disc is provided with a plurality of different polarizing shaft angles, and the light detector synchronously captures gray-scale images corresponding to the different polarizing shaft angles of the multi-angle polarizing disc;
the light source is arranged at one side of the coiled polarizing film to be detected and used for generating a light beam to irradiate the coiled polarizing film to be detected, and the light beam irradiates the coiled polarizing film to be detected and then is transmitted to the multi-angle polarizing disc to generate a gray-scale image;
the detection host is in signal connection with the plurality of detection modules and the linear slide rail movement unit, the detection host controls the linear slide rail movement unit and the plurality of detection modules, and full-width calculation is carried out on the roll-shaped polarizing film to be detected according to the gray-scale image captured by the light detector, so that numerical distribution of polarizing axis angles of the full-width roll-shaped polarizing film to be detected is obtained.
Further, each of the plurality of alternately arranged movers correspondingly drives and positions a light detector of one detection module, and the light detector is a CCD.
Further, the multi-angle polarizing plate comprises 6 polaroids and a disc fixing piece, the 6 polaroids are assembled on the disc fixing piece, and the polarizing axis angles after the correction of the 6 polaroids are 0 degree, 30 degree, 60 degree, 90 degree, 120 degree and 150 degree respectively.
Further, the light source is a strip-shaped LED light source, and light beams generated by the strip-shaped LED light source irradiate different positions of the coiled polarizing film to be detected.
Further, the coiled polarizing film to be measured is fixed on a sample platform, and the full-width optical film axial automatic measurement system starts measurement after confirming that each element can normally act.
Further, the light intensity of the light beam generated by the light source after intensity adjustment irradiates the coiled polarizing film to be detected, so that the gray scale value of the gray scale image captured by the light detector is lower than a preset supersaturation critical value.
Further, the light detector synchronously captures gray scale images of the corresponding areas of the 6 polaroids to obtain area gray scale values of the 6 polaroid areas.
Further, the detecting host corresponds the area gray scale values of the 6 polarizer areas and the corrected polarizing axis angles of 0 °, 30 °, 60 °, 90 °, 120 ° and 150 ° of the 6 polarizers, and records the gray scale values of the polarizing plate with the polarizing axis angle of 0 °, the polarizing plate with the polarizing axis angle of 30 °, the polarizing plate with the polarizing axis angle of 60 °, the polarizing plate with the polarizing axis angle of 90 °, the polarizing plate with the polarizing axis angle of 120 ° and the polarizing plate with the polarizing axis angle of 150 °.
Further, nonlinear curve fitting is performed on the gray scale value of the polarizer with the polarizing axis angle of 0 degree, the gray scale value of the polarizer with the polarizing axis angle of 30 degrees, the gray scale value of the polarizer with the polarizing axis angle of 60 degrees, the gray scale value of the polarizer with the polarizing axis angle of 90 degrees, the gray scale value of the polarizer with the polarizing axis angle of 120 degrees and the gray scale value of the polarizer with the polarizing axis angle of 150 degrees through a sine function model, so that the polarizing axis angle of the coiled polarizing film to be measured is obtained.
Further, any one detection module of the plurality of detection modules detects any one set-width detection point of the coiled polarizing film to be detected;
after any one of the set width detection points of the rolled polarizing film to be detected is detected, the linear slide rail moving unit moves the next detection module of the detection modules to detect the next set width detection point of the rolled polarizing film to be detected until the numerical distribution of the polarizing axis angle of the full width of the rolled polarizing film to be detected is obtained.
Compared with the prior art, the application has the following beneficial effects:
the application provides a full width optical film axial automatic measurement system, includes: the linear slide rail motion unit comprises a plurality of movers which are arranged at intervals, each mover is used for driving and positioning one detection module, each detection module comprises a multi-angle polarizing disc and a light detector, the multi-angle polarizing disc is provided with a plurality of different polarizing shaft angles, the light detector synchronously captures gray scale images corresponding to the different polarizing shaft angles of the multi-angle polarizing disc, the light source is arranged on one side of a coiled polarizing film to be detected and is used for generating light beams to irradiate the coiled polarizing film to be detected, the light beams irradiate the coiled polarizing film to be detected and then are transmitted to the multi-angle polarizing disc to generate gray scale images, the detection host is connected with the detection modules and the linear slide rail motion unit through signals, and the detection host is used for controlling the linear slide rail motion unit and the detection modules to perform full-width calculation on the coiled polarizing film to be detected according to the gray scale images captured by the light detector so as to obtain the full-width axial-lifting efficiency distribution polarizing film to be detected, and the measurement accuracy of measurement of the measurement angle values is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. Some specific embodiments of the present application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings denote the same or similar parts or portions, and it will be understood by those skilled in the art that the drawings are not necessarily drawn to scale, in which:
FIG. 1 is a schematic diagram of an architecture of the full-width optical film axial automatic measurement system of the present application;
FIG. 2 is a schematic diagram of a single detection module according to the present application;
FIG. 3 is a schematic diagram of a curve fitted to the equation of the present application;
FIG. 4 is a schematic flow chart of the method for automatically measuring the axial direction of the full-width optical film.
Detailed Description
In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Example 1
Referring to fig. 1-4, the present embodiment provides an axial automatic measurement system for full-width optical film, comprising: the linear slide rail motion unit comprises a plurality of movers which are arranged at intervals, each mover is used for driving and positioning one detection module, each detection module comprises a multi-angle polarizing disc and a light detector, the multi-angle polarizing disc is provided with a plurality of different polarizing shaft angles, the light detector synchronously captures gray scale images corresponding to the different polarizing shaft angles of the multi-angle polarizing disc, the light source is arranged on one side of a coiled polarizing film to be detected and is used for generating light beams to irradiate the coiled polarizing film to be detected, the light beams irradiate the coiled polarizing film to be detected and then are transmitted to the multi-angle polarizing disc to generate gray scale images, the detection host is connected with the detection modules and the linear slide rail motion unit through signals, and the detection host is used for controlling the linear slide rail motion unit and the detection modules to perform full-width calculation on the coiled polarizing film to be detected according to the gray scale images captured by the light detector so as to obtain the full-width axial-lifting efficiency distribution polarizing film to be detected, and the measurement accuracy of measurement of the measurement angle values is improved.
It should be noted that, in the prior art, the light detector is difficult to distinguish the micro light intensity variation under the condition of orthogonal deviation analysis, and the measurement result is easy to be unstable, so the measurement precision is optimal to be about +/-0.05 degrees, while the full-width optical film axial automatic measurement system provided by the embodiment does not need to actually measure the light intensity value under the condition that the system is in the orthogonal deviation analysis, so the measurement precision can be improved by an order of magnitude under the condition of using the same element, and reaches +/-0.005 degrees; in addition, since the full-width optical film axial automatic measurement system provided by the embodiment does not use a motor to rotate the analytical sheet, the measurement resolution is not limited by the stepping resolution of the motor, so that the measurement resolution can be increased from 0.1 DEG to below 0.01 DEG; also, because no motor is used to adjust the time of the step resolution back and forth scanning measurement, the gray scale value is captured by the synchronous image of the light detector, the measurement time can be greatly reduced, and the measurement efficiency can be improved.
It should be noted that the linear slide motion unit includes a plurality of movers that set up at intervals, and every mover is used for driving and positioning a detection module, therefore, the system can carry out a plurality of measurement tasks to improve measurement efficiency.
It should be noted that each detection module includes a multi-angle polarizing plate and a photodetector. The polarizing disc is provided with a plurality of different polarizing shaft angles, and the light detector can synchronously capture gray-scale images corresponding to the different polarizing disc angles, so that the system can simultaneously obtain light intensity information at a plurality of different angles, and the data acquisition efficiency is improved.
It should be noted that, the light source is disposed at one side of the to-be-measured roll-shaped polarizing film, and is used for generating a light beam to irradiate the to-be-measured roll-shaped polarizing film, and the light beam is transmitted to the multi-angle polarizing plate to generate a gray-scale image after irradiating the to-be-measured roll-shaped polarizing film, so that the light intensity information under multiple angles can be obtained under one setting without additional multiple back and forth scanning.
It should be noted that, the detecting host is in signal connection with the plurality of detecting modules and the linear sliding rail moving unit, controls the linear sliding rail moving unit and the plurality of detecting modules, and according to the gray scale image captured by the light detector, the detecting host performs full width calculation to obtain the numerical distribution of the polarizing axis angle of the full width of the coiled polarizing film to be detected, so that the polarizing axis angle information in the full width range can be effectively obtained, and the measuring precision and efficiency are improved.
In this embodiment, when measuring the polarizing axis angles of different positions of the full-width polarizing film, only 6 polarizers are installed on a disc fixing member, the polarizing axis angles of the 6 polarizers are corrected to be 0 °, 30 °, 60 °, 90 °, 120 °, 150 °, respectively, gray scale values of the 6 polarizers on the disc are synchronously captured through the CCD image, and then a mathematical operation of nonlinear curve fitting is performed through a sine function model, so as to obtain the polarizing axis angle of the sample to be measured, which not only greatly improves the measurement efficiency, but also greatly improves the measurement resolution due to the very fast speed of capturing the image by the CCD and is not limited by the stepping resolution of the motor itself in the conventional measurement method, and also saves the time consumed by rotating the motor for multiple angles. The traditional motor rotates the detection time of the analysis piece to be long, the light transmission quantity positions captured at different times are not the same detection point represented on the continuous production line, the obtained detection value is insufficient in representation, and the error is large. In this embodiment, the multi-angle light transmittance values are captured instantaneously and synchronously, and the obtained analysis values are highly reliable, and the points represented on the rapid continuous production line are actually the same detection points.
In this embodiment, the system architecture is different from the conventional technology, in this embodiment, the system emits light from a light source, and the light passes through a rolled polarizing film to be detected, then passes through an analysis sheet, for example, a multi-angle polarizing disc formed by combining 6 polarizers with different polarization axes, and finally receives light from a photodetector, for example, a CCD image capturing unit, and the photodetector then transmits the measured voltage signal, for example, an image gray scale value, to a detection host for analysis processing.
In some preferred embodiments, each of the plurality of spaced apart movers correspondingly drives and positions a light detector of one of the detecting modules, and the light detector is a CCD.
It should be noted that, a CCD (Charge-Coupled Device) is a common photosensor, and is commonly used for image acquisition and light intensity measurement. The CCD is very sensitive to the response of light and can receive weak light signals. This is very advantageous for measuring small changes in light intensity, especially in the case of orthogonal offset analysis, where the light intensity is usually weak, the CCD can better capture such weak signals, thus improving the measurement accuracy. In addition, the CCD sensor has a higher pixel density, and can acquire more data points in a small range. Thus, when the light intensity is adjusted to the lowest point, the bias axis angle can be accurately calculated through more data points, and the angle resolution is improved.
In some preferred embodiments, the multi-angle polarizing plate includes 6 polarizers and a disk fixture, the 6 polarizers are assembled on the disk fixture, and the polarization axis angles of the 6 polarizers after correction are 0 °, 30 °, 60 °, 90 °, 120 ° and 150 °, respectively.
It should be noted that more polarizers, such as 12 sheets, may be used for the multi-angle polarizing plate. The polarizers are mounted on a disc fixture, with the angle of each polarizer aligned at a different angle, e.g., 0 °, 30 °, 60 °, 330 °. Meanwhile, the coiled polarizing film to be measured can be irradiated by a light source, and the light beam is transmitted to the multi-angle polarizing disc. An array type photodetector is used to capture the gray-scale image corresponding to each polarizer angle. Each light detector corresponds to a polarizer with a specific angle, and the light detector array can capture information of a plurality of angles at the same time. And carrying out full-width calculation on the collected gray-scale image data through data processing to obtain the polarizing axis angle distribution of the full-width of the film to be detected.
In some preferred embodiments, the light source is a strip-shaped LED light source, and the light beam generated by the strip-shaped LED light source irradiates different positions of the roll-shaped polarizing film to be tested.
It should be noted that, the design of the strip-shaped LED light source can realize more uniform light irradiation, so as to ensure that the coiled polarizing film to be measured receives similar light irradiation at different positions and ensure the measurement accuracy. By irradiating light beams at different positions, the system can obtain gray scale images at different positions, further improves the position resolution of full-width calculation, and has important significance for detecting the surface non-uniformity or local characteristics of the material. Meanwhile, the surface characteristics of the coiled polarizing film to be detected can be better captured by irradiating different positions of the strip-shaped LED light source. In particular in the case of irregularities, the illumination of different positions may help to capture more details.
In some preferred embodiments, the roll-type polarizing film to be measured is fixed on a sample platform, and the full-width optical film axial automatic measurement system starts measurement after confirming that each element can normally act.
It should be noted that, fix the roll-type polarizing film that awaits measuring on sample platform, can provide more stable measuring environment, reduce the influence of external factor to the measurement, guarantee repeatability and the uniformity of measurement. Measurement is started after normal actions of all elements are confirmed, measurement errors caused by element faults or instability can be avoided, and reliability and accuracy of measurement are improved. And after the normal state of the element is confirmed, the measurement is started, so that the operation safety can be ensured, and accidents are avoided.
In some preferred embodiments, the light intensity of the light beam generated by the light source after intensity adjustment irradiates the rolled polarizing film to be measured, so that the gray scale value of the gray scale image captured by the light detector is lower than a preset supersaturation threshold value.
It should be noted that, when the gray-scale value reaches the maximum value, information is lost. By adjusting the light source intensity, the gray scale value captured by the light detector is lower than the oversaturation critical value, so that the oversaturation phenomenon can be avoided, and more detail information is reserved. Meanwhile, the gray scale range of the light detector can be better adapted to the measurement in the proper gray scale range, the image processing effect is improved, and the method is very important for the follow-up image analysis and the calculation of the full width accuracy. The oversaturation may cause image distortion, influence subsequent analysis calculation, adjust the light source intensity and can avoid this kind of condition, promote measurement accuracy.
In some preferred embodiments, the photodetector captures gray scale images of corresponding regions of the 6 polarizers simultaneously to obtain regional gray scale values of the 6 polarizer regions. Further, the detecting host corresponds the area gray scale values of the 6 polarizer areas and the corrected polarizing axis angles of 0 °, 30 °, 60 °, 90 °, 120 ° and 150 ° of the 6 polarizers, and records the gray scale values of the polarizing plate with the polarizing axis angle of 0 °, the polarizing plate with the polarizing axis angle of 30 °, the polarizing plate with the polarizing axis angle of 60 °, the polarizing plate with the polarizing axis angle of 90 °, the polarizing plate with the polarizing axis angle of 120 ° and the polarizing plate with the polarizing axis angle of 150 °.
It should be noted that, through capturing the region gray scale images of different polaroids synchronously, the system obtains the gray scale value of each polaroid under different angles, and the richness and diversity of data are increased. In addition, the gray scale value of the region is corresponding to the corrected polarized light axis angle, and the association between the angle and the gray scale value is established, so that the subsequent data processing and analysis are facilitated. In addition, by recording gray scale values under different angles, the system can further analyze the optical characteristics of the coiled polarizing film to be tested under different angles, such as the change conditions of reflection, transmission and the like.
In some preferred embodiments, nonlinear curve fitting is performed on the gray scale value of the polarizer with the polarizing axis angle of 0 °, the gray scale value of the polarizer with the polarizing axis angle of 30 °, the gray scale value of the polarizer with the polarizing axis angle of 60 °, the gray scale value of the polarizer with the polarizing axis angle of 90 °, the gray scale value of the polarizer with the polarizing axis angle of 120 °, and the gray scale value of the polarizer with the polarizing axis angle of 150 ° by using a sine function model, so as to obtain the polarizing axis angle of the rolled polarizing film to be measured.
Further, let the polarized light axis angle after the polarizer correction be x, the light intensity voltage value corresponding to the polarized light axis angle xFor y, a sine function model through yPerforming nonlinear curve fitting to obtain parameters P1, P2 and P3, and introducing the parameters P1, P2 and P3 into a sine function model +.>To obtain a fitting equation;
and obtaining the minimum value of the fitting equation in the range of x=0-180 to obtain the condition that the system deduced by the sine function model y is in orthogonal deviation analysis, wherein the corresponding angle value is the polarizing axis angle of the coiled polarizing film to be measured.
It should be noted that, the nonlinear relation between the gray scale values of the polarizer at different angles of the polarizing axis can be captured more accurately by using the sine function model. Since optical properties typically involve angular variations, nonlinear fits may better reflect the actual physical process. In addition, by carrying out nonlinear fitting on gray scale values of a plurality of polaroids, more accurate polarizing axis angle values can be obtained, and the measurement precision and the angle resolution in the full-width optical film axial automatic measurement system can be improved. Meanwhile, the sine function model can provide richer information, so that not only can the angular value distribution be obtained, but also more optical information can be explored. The sine function model is a fit to a nonlinear relationship that can better characterize the angular dependence in optical phenomena. The polarized light axis angle and the gray scale value often show a sine or cosine function relation, and the polarized light axis angle of the coiled polarized light film to be measured can be more accurately obtained by using a sine function model. This is because polarization phenomena involve amplitude and phase variations, which can be better described by a sine function model.
In some preferred embodiments, any one of the plurality of detection modules detects any one of the set-width detection points of the rolled polarizing film to be detected;
after any one of the set width detection points of the rolled polarizing film to be detected is detected, the linear slide rail moving unit moves the next detection module of the detection modules to detect the next set width detection point of the rolled polarizing film to be detected until the numerical distribution of the polarizing axis angle of the full width of the rolled polarizing film to be detected is obtained.
It should be noted that, by detecting different positions one by one, the system can obtain the polarizing axis angle number distribution of the full width of the rolled polarizing film to be detected, and obtain more comprehensive information. In addition, detection is performed at detection points with different set widths, so that more detailed distribution of the polarizing axis angle values can be obtained.
Example two
Referring to fig. 1-4, the present embodiment provides a full-width optical film axial automatic measurement method, which is applied to the full-width optical film axial automatic measurement system in the above embodiment, and includes the following steps:
1. the measurement is started, a sample to be measured is fixed on a sample platform, and the measurement can be started after each element of the system is confirmed to be capable of operating normally;
2. the intensity of the light source is regulated, so that the accuracy of the measured value is ensured, and the intensity of the light is controlled so as not to oversaturate the gray scale value captured by the CCD;
3, capturing an image by the CCD; synchronously capturing gray scale values in the 6 polaroid areas;
4. the gray scale value of the region corresponds to the polarizing axis angle, and the light intensity value corresponding to the polarizing axis angle of each region is systematically set and recorded, wherein the light intensity value is respectively the gray scale value of a 0 DEG sheet, the gray scale value of a 30 DEG sheet, the gray scale value of a 60 DEG sheet, the gray scale value of a 90 DEG sheet, the gray scale value of a 120 DEG sheet and the gray scale value of a 150 DEG sheet;
5. nonlinear curve fitting is used for solving a fitting equation, and the angle (x) recorded in the steps and the corresponding light intensity voltage value (y) are utilized to pass through a sine function modelPerforming a mathematical operation of nonlinear curve fitting to obtain P 1 、P 2 P 3 Obtaining a fitting equation after the fitting equation is carried out;
6. calculating the minimum value of the fitting equation within the range of x=0-180 by using mathematical operation, namely deducing the condition that the system is in orthogonal analysis deviation through a sine function model, and regarding the corresponding angle value as the bias axis angle of the sample to be measured;
7. moving the next detection point, moving the detection module to the next set width position by using the linear slide rail movement system;
8. analyzing the angle of the polarizing axis, and repeating the steps 2-6;
9. displaying the polarizing axis angle of the sample to be measured on a human-computer interface after the measurement is finished;
10. setting a plurality of detection points, setting a plurality of film width positions of the polarizing axis direction to be detected, and repeating the steps 2-8 to obtain the numerical distribution of the polarizing axis angles of the full-width polarizing film.
It should be noted that, in the prior art, the light detector is difficult to distinguish the micro light intensity variation under the condition of orthogonal deviation analysis, and the measurement result is easy to be unstable, so the measurement precision is optimal to be about +/-0.05 degrees, while the full-width optical film axial automatic measurement system provided by the embodiment does not need to actually measure the light intensity value under the condition that the system is in the orthogonal deviation analysis, so the measurement precision can be improved by an order of magnitude under the condition of using the same element, and reaches +/-0.005 degrees; in addition, since the full-width optical film axial automatic measurement system provided by the embodiment does not use a motor to rotate the analytical sheet, the measurement resolution is not limited by the stepping resolution of the motor, so that the measurement resolution can be increased from 0.1 DEG to below 0.01 DEG; also, because no motor is used to adjust the time of the step resolution back and forth scanning measurement, the gray scale value is captured by the synchronous image of the light detector, the measurement time can be greatly reduced, and the measurement efficiency can be improved.
It should be noted that the linear slide motion unit includes a plurality of movers that set up at intervals, and every mover is used for driving and positioning a detection module, therefore, the system can carry out a plurality of measurement tasks to improve measurement efficiency.
It should be noted that each detection module includes a multi-angle polarizing plate and a photodetector. The polarizing disc is provided with a plurality of different polarizing shaft angles, and the light detector can synchronously capture gray-scale images corresponding to the different polarizing disc angles, so that the system can simultaneously obtain light intensity information at a plurality of different angles, and the data acquisition efficiency is improved.
It should be noted that, the light source is disposed at one side of the to-be-measured roll-shaped polarizing film, and is used for generating a light beam to irradiate the to-be-measured roll-shaped polarizing film, and the light beam is transmitted to the multi-angle polarizing plate to generate a gray-scale image after irradiating the to-be-measured roll-shaped polarizing film, so that the light intensity information under multiple angles can be obtained under one setting without additional multiple back and forth scanning.
It should be noted that, the detecting host is in signal connection with the plurality of detecting modules and the linear sliding rail moving unit, controls the linear sliding rail moving unit and the plurality of detecting modules, and according to the gray scale image captured by the light detector, the detecting host performs full width calculation to obtain the numerical distribution of the polarizing axis angle of the full width of the coiled polarizing film to be detected, so that the polarizing axis angle information in the full width range can be effectively obtained, and the measuring precision and efficiency are improved.
In this embodiment, when measuring the polarizing axis angles of different positions of the full-width polarizing film, only 6 polarizers are installed on a disc fixing member, the polarizing axis angles of the 6 polarizers are corrected to be 0 °, 30 °, 60 °, 90 °, 120 °, 150 °, respectively, gray scale values of the 6 polarizers on the disc are synchronously captured through the CCD image, and then a mathematical operation of nonlinear curve fitting is performed through a sine function model, so as to obtain the polarizing axis angle of the sample to be measured, which not only greatly improves the measurement efficiency, but also greatly improves the measurement resolution due to the very fast speed of capturing the image by the CCD and is not limited by the stepping resolution of the motor itself in the conventional measurement method, and also saves the time consumed by rotating the motor for multiple angles. The traditional motor rotates the detection time of the analysis piece to be long, the light transmission quantity positions captured at different times are not the same detection point represented on the continuous production line, the obtained detection value is insufficient in representation, and the error is large. In this embodiment, the multi-angle light transmittance values are captured instantaneously and synchronously, and the obtained analysis values are highly reliable, and the points represented on the rapid continuous production line are actually the same detection points.
In this embodiment, the system architecture is different from the conventional technology, in this embodiment, the system emits light from a light source, and the light passes through a rolled polarizing film to be detected, then passes through an analysis sheet, for example, a multi-angle polarizing disc formed by combining 6 polarizers with different polarization axes, and finally receives light from a photodetector, for example, a CCD image capturing unit, and the photodetector then transmits the measured voltage signal, for example, an image gray scale value, to a detection host for analysis processing.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (5)
1. An automatic axial measurement system for a full-width optical film, comprising:
the linear slide rail moving unit comprises a plurality of movers which are arranged at intervals, and each mover is used for driving and positioning one detection module;
the system comprises a plurality of detection modules, a plurality of detection modules and a display module, wherein each detection module comprises a multi-angle polarizing disc and a light detector, the multi-angle polarizing disc is provided with a plurality of different polarizing shaft angles, and the light detector synchronously captures gray-scale images corresponding to the different polarizing shaft angles of the multi-angle polarizing disc;
the light source is arranged at one side of the coiled polarizing film to be detected and used for generating a light beam to irradiate the coiled polarizing film to be detected, and the light beam irradiates the coiled polarizing film to be detected and then is transmitted to the multi-angle polarizing disc to generate a gray-scale image;
the detection host is in signal connection with the plurality of detection modules and the linear slide rail movement unit, controls the linear slide rail movement unit and the plurality of detection modules, and calculates the full width of the roll-shaped polarizing film to be detected according to the gray scale image captured by the light detector so as to obtain the numerical distribution of the polarizing axis angles of the full width of the roll-shaped polarizing film to be detected;
the full-width optical film axial automatic measurement system applies a full-width optical film axial automatic measurement method, and the full-width optical film axial automatic measurement method comprises the following steps: step 1, starting measurement, namely fixing a sample to be measured on a sample platform, and starting measurement after confirming that all elements of a system can normally act; step 2, adjusting the intensity of the light source, and controlling the light intensity so as to ensure that the measured value is accurate and the CCD is not supersaturated with the gray scale value; step 3, capturing an image by the CCD; synchronously capturing gray scale values in the 6 polaroid areas; step 4, performing systematic setting of light intensity values corresponding to the polarizing axis angles of the areas to record, wherein the light intensity values are respectively 0 DEG sheet gray scale value, 30 DEG sheet gray scale value, 60 DEG sheet gray scale value, 90 DEG sheet gray scale value, 120 DEG sheet gray scale value and 150 DEG sheet gray scale value; step 5, fitting equation is calculated by nonlinear curve fitting, and the angle x recorded in the step and the corresponding light intensity voltage value y are utilized to pass through a sine function modelPerforming a mathematical operation of nonlinear curve fitting to obtain P 1 、P 2 P 3 Obtaining a fitting equation after the fitting equation is carried out; step 6, calculating the minimum value of the fitting equation in the range of x=0-180 by utilizing mathematical operation, namely deducing the condition that the system is in orthogonal deviation analysis through a sine function model, and regarding the corresponding angle value as the deviation axis angle of the sample to be measured; step 7, moving the next detection point, and moving the detection module to the next set width position by using the linear slide rail movement system; step 8, analyzing the angle of the polarizing axis, and repeating the steps 2-6; step 9, displaying the polarizing axis angle of the sample to be measured on a human-computer interface after the measurement is finished; step 10, setting a plurality of detection points, namely setting a plurality of film web positions of which the polarizing axis directions are to be detected, and repeating the steps 2-8 to obtain the numerical distribution of the polarizing axis angles of the full-width polarizing film;
each of the plurality of alternately arranged movers correspondingly drives and positions a light detector of one detection module, and the light detector is a CCD; the multi-angle polarizing disc comprises 6 polaroids and a disc fixing piece, wherein the 6 polaroids are assembled on the disc fixing piece, and the polarizing shaft angles after the 6 polaroids are corrected are 0 degree, 30 degree, 60 degree, 90 degree, 120 degree and 150 degree respectively; the light source is a strip-shaped LED light source, and light beams generated by the strip-shaped LED light source irradiate different positions of the coiled polarizing film to be detected; the light detector synchronously captures gray scale images of corresponding areas of the 6 polaroids to obtain area gray scale values of the 6 polaroid areas; the detection host corresponds the area gray scale values of the 6 polaroid areas and the corrected polarizing axis angles of 0 degree, 30 degree, 60 degree, 90 degree, 120 degree and 150 degree of the 6 polaroids, and records the gray scale values of the polaroids with the polarizing axis angles of 0 degree, 30 degree, 60 degree, 90 degree, 120 degree and 150 degree.
2. The system of claim 1, wherein the roll-to-be-measured polarizing film is fixed on a sample platform, and the system starts measurement after confirming that each element is operating normally.
3. The system of claim 1, wherein the light source is intensity-tuned to generate a light beam that irradiates the rolled polarizing film to be measured such that the gray scale value of the gray scale image captured by the photodetector is lower than a predetermined supersaturation threshold.
4. The system of claim 1, wherein the gray scale value of the polarizer with a polarizing axis angle of 0 °, the gray scale value of the polarizer with a polarizing axis angle of 30 °, the gray scale value of the polarizer with a polarizing axis angle of 60 °, the gray scale value of the polarizer with a polarizing axis angle of 90 °, the gray scale value of the polarizer with a polarizing axis angle of 120 °, and the gray scale value of the polarizer with a polarizing axis angle of 150 ° are fitted by a sine function model to obtain the polarizing axis angle of the roll-type polarizing film to be measured.
5. The full-width optical film axial direction automatic measurement system according to any one of claims 1 to 4, comprising:
any one detection module of the detection modules detects any one set breadth detection point of the coiled polarizing film to be detected;
after any one of the set width detection points of the rolled polarizing film to be detected is detected, the linear slide rail moving unit moves the next detection module of the detection modules to detect the next set width detection point of the rolled polarizing film to be detected until the numerical distribution of the polarizing axis angle of the full width of the rolled polarizing film to be detected is obtained.
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