CN214097211U - Transparent plate glass's defect detecting device - Google Patents
Transparent plate glass's defect detecting device Download PDFInfo
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- CN214097211U CN214097211U CN202022774945.2U CN202022774945U CN214097211U CN 214097211 U CN214097211 U CN 214097211U CN 202022774945 U CN202022774945 U CN 202022774945U CN 214097211 U CN214097211 U CN 214097211U
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Abstract
The utility model discloses a transparent plate glass defect detecting device, including linear array CCD camera, white parallel light source, transmission-type spatial light modulator, the sample that awaits measuring, computer, conveyer, strutting arrangement, lens hood etc.. The white parallel light source is used for providing uniform illumination required by detection, the parallel light passes through the transmission type spatial light modulator to output linearly polarized light, the polarized light penetrates through a sample to be detected to enter the linear array CCD camera, and an image formed by the sample to be detected through the polarized light can be acquired. The conveying device is used for conveying samples to be detected, and automatic continuous detection is achieved. The supporting device is used for fixing the linear array CCD camera. The light shield is used for shielding external illumination and providing a dark field environment. And adjusting the transmission type spatial light modulator until the linear array CCD camera presents a full black image on the computer, starting the conveying device, acquiring an image when a sample to be detected enters between the transmission type spatial light modulator and the linear array CCD camera, acquiring a white defect outline image if the sample to be detected has surface defects, and judging whether the sample has defects or not and the defect type after the image is processed by the computer. The detection device can realize automatic real-time detection of the defects of the transparent plate glass, and has simple structure and high detection efficiency.
Description
Technical Field
The utility model belongs to transparent flat glass defect detection area is a detection device about production defects such as transparent flat glass surface mar, inside bubble or inclusion, is the detection device of an automatic, non-contact, continuous accurate transparent flat glass defect.
Background
Transparent plate glass is an optical material widely used in various fields such as industry and building, and has the advantages of special optical characteristics, strong corrosion resistance, easy processing, low cost, good stability and the like. However, since the process of the transparent plate glass is complicated in the production process, some defects are inevitably generated in the processes of casting, curing, cutting, transporting, and the like. The plate glass with defects not only affects the appearance, but also changes the optical characteristics, seriously affects the use value of the transparent plate glass, and cannot be processed and produced in the next step, so that enterprises need to detect the defects of the transparent plate glass in the production process and timely remove the defective products.
At present, the defect detection of transparent plate glass in domestic manufacturing industry still mainly takes manual work, so that the efficiency is low, the labor cost is high, the detection result is influenced by the state of workers, and the accuracy and reliability of the detection result cannot be ensured.
SUMMERY OF THE UTILITY MODEL
1. The problems to be solved are as follows:
in the current domestic manufacturing industry, the defect detection of the transparent plate glass mainly adopts an artificial visual detection method, namely, a sample to be detected is irradiated by strong light, workers directly observe whether the sample to be detected has defects and defect types, and manually classify the samples. The method has the defects of low efficiency, high cost, incapability of ensuring detection precision and the like, and can also harm the eye health of workers. How to realize the automatic detection of the surface defects of the transparent parallel flat plate is a big problem at present.
2. The technical scheme is as follows:
the drawback to current manufacturing manual detection defect, the utility model provides a non-contact transparent plate glass's defect automatic checkout device can solve above-mentioned problem.
The utility model relates to a non-contact transparent sheet glass's defect automatic checkout device, including linear array CCD camera 1, transmission-type spatial light modulator 2, white parallel light source 3, the sample 4 that awaits measuring, conveyer 5, strutting arrangement 6-9, computer 10 and lens hood 11.
The supporting device comprises a base 9, a fixed platform 8, a telescopic rod 6 and a fastener 7. The base 9 is fixed on the ground, the upper surface of the base is provided with a sliding chute, and the sliding chute is connected with the fixed table 8 to realize the left and right movement of the fixed table 8; the fixed table 8 is provided with an expansion link 6, and the length of the expansion link 6 is adjusted through a fastener 7; the linear array CCD camera 1 is fixed on the telescopic rod 6, and the working height and the working position of the linear array CCD camera 1 can be adjusted in the front-back dimension, the left-right dimension and the up-down dimension. The linear array CCD camera 1 is connected with a computer 10, and remote control of the linear array CCD camera 1 and storage and processing of images are achieved.
Conveyer 5 places subaerial, and the primary structure is programmable control's roller, and conveyer is constituteed jointly to a plurality of independent programmable control's roller, and the rotation of roller is controlled according to detection precision and speed by the control program of compiling in advance of storage at computer 10. The sample 4 to be detected is placed on the conveying device 5 and moves along with the traction of the rollers, so that the automatic real-time detection of the transparent flat plate is realized.
White parallel light source 3 places inside conveyer 5, and white parallel light source 3's luminous area should be greater than the area of the sample 4 images of gathering that awaits measuring. The white parallel light source 3 is composed of an array of compact LED lamp groups arranged on an aluminum substrate. The light path direction is that the light enters the transmission type spatial light modulator 2 from the white parallel light source 3 to output linearly polarized light, and then enters the linear array CCD camera 1 after penetrating through the sample 4 to be measured. The sample 4 to be detected is imaged and acquired by the linear array CCD camera 1 to obtain image data, and the image data is transmitted to the computer 10 for corresponding image processing to obtain a detection result.
Linear array CCD camera 1 mainly includes optical lens, polaroid, linear array CCD image sensor, light filter etc. and wherein linear array CCD image sensor and optical lens's lectotype is decided by detecting the precision. By continuously scanning the sample 4 to be detected line by line, the scanning and image processing speed is consistent with the movement speed of the conveying device 5, and the uniform detection of the whole surface of the sample to be detected can be realized.
Transmission-type spatial light modulator 2 is one kind can be under control to the light beam correlation parameter through the modulation light field, carries out the device of modulating like amplitude, polarization, phase place etc. can be with the parallel light modulation that white parallel light source 3 sent for linearly polarized light output. The upper surface of the transmission-type spatial light modulator 2 is covered with a layer of protective film, so that interference of dust, scratches and the like on collected images can be prevented, the detection precision of the device is ensured, and the service life of the device is prolonged. The distance between the upper surface of the transmissive spatial light modulator 2 and the sample 4 to be measured should be as small as possible.
3. The working principle is as follows:
adjusting the transmission type spatial light modulator 2 until an extinction phenomenon is generated when the linear array CCD camera 1 images, wherein no sample 4 to be detected exists in a light path, and the acquired image is a full black extinction image; a sample 4 to be detected is placed between the transmission-type spatial light modulator 2 and the linear array CCD camera 1, if the sample 4 to be detected has defects, the defects of the sample 4 to be detected are non-extinction images on the images acquired by the computer 10, and the images are represented as white defect outlines. The image is then sent to the computer 10 for processing, and the information of the defect can be determined.
Transparent sheet glass's defect device have following advantage:
1. the utility model provides a transparent sheet glass's defect detecting device, this detection device can realize non-contact automated inspection, and detection efficiency is high, the practicality is good, the testing result is accurate reliable.
2. The utility model discloses utilize linear array CCD camera can carry out continuous even image acquisition, can not receive the transparent sheet glass's that awaits measuring breadth restriction, evenly detect monoblock sheet glass's image, carry out the discernment of defect through image processing algorithm again. The detection effect is good, manual detection can be replaced, and the enterprise cost is saved.
3. Compare with current non-contact transparent glass defect detecting device, detection device to transparent parallel plate glass's defect detection, detection device simple structure, simple to operate maintains and reforms transform fairly easily.
Drawings
FIG. 1 is a structural diagram of a defect detecting device for transparent plate glass according to the present invention;
FIG. 2 is a schematic view of the appearance of the defect detecting apparatus for transparent plate glass according to the present invention;
fig. 3 is a schematic view of the optical path of the detecting device according to the present invention;
Detailed Description
In order to facilitate understanding of the present invention, the following description will be combined with the relevant drawings of the present invention, which is to say that the device of the present invention performs more clear and comprehensive description. While the present embodiment has been described in terms of a preferred embodiment, the present invention can be implemented in a variety of other ways, and is not limited to the embodiment described herein. The embodiments are provided herein for clarity and complete description of the disclosure.
In the description of the present invention, it should be noted that terms used herein, such as "left", "right", "up", "down", "front", "back", and the like, are all described based on the present embodiment, for the purpose of simplifying the description, and not limiting the specific orientation of the devices, such as the white parallel light source 3, the supporting devices 6 to 9, the transmitting device 5, the transmissive spatial light modulator 2, the linear array CCD camera 1, and the like, described in the present invention.
With reference to fig. 1 and 2, in the embodiment of the present invention, the base 9 with the sliding groove is fixed on the ground, and the fixing table 8 is connected above the base, so that the fixing table 8, together with the telescopic rod 6 and the linear array CCD camera 1, can move left and right, and the purpose is to adjust the working position of the linear array CCD camera 1.
It should be noted that the telescopic rod 6 in the support device has two parts, one end is connected with the fixed platform 8, the other end is fixed with the linear array CCD camera 1, and the length thereof can be adjusted by the fastener 7. The adjustment of the working height and the shooting position of the linear array CCD camera 1 can be realized.
It should be noted that the conveyor 5 is placed on the ground and mainly configured as a programmable roller, and a plurality of independently programmable rollers together constitute the conveyor, and the rotation of the rollers is controlled by a pre-programmed control program stored in the computer 10 according to the detection accuracy and speed. And drawing the sample 4 to be measured to move at a constant speed along with the rotation of the roller. Because the linear array CCD camera 1 only collects one line of pixel points at a time and obtains a two-dimensional image by means of line-by-line scanning, the image collecting and processing speed and the movement speed of the sample 4 to be detected should meet a certain functional relationship. In this embodiment, the following relations exist among the transmission speed v of the sample 4 to be measured, the time t required for image acquisition and processing of n rows of pixels, and the camera phase element size i, but the constraint conditions are not limited to:
it should be noted that the white parallel light source 3 is placed inside the conveying device 5, and the light emitting area of the white parallel light source 3 should be larger than the area of the image taken by the sample to be measured. The white parallel light source 3 is formed by compactly arranging a plurality of LED lamp groups on an aluminum substrate, emitting point light sources, and then emitting relatively uniform parallel light through a light guide plate, a light-diffusing film and the like, thereby providing uniform and stable illumination for defect detection.
It should be noted that the line CCD camera 1 mainly includes an optical lens, a polarizing plate, an optical filter, a line CCD image sensor, and the like. By continuously scanning the sample 4 to be detected line by line, the scanning and image processing speed is consistent with the movement speed of the conveying device 5, and the uniform detection of the whole surface of the sample to be detected can be realized. The type of which determines the accuracy of the detection system. The linear array CCD image sensor has the following relationship between the resolution and the detection precision:
the relationship among the parameters of the optical lens focal length, the working distance, the camera target surface size, the visual field and the like is as follows, wherein FOV is the visual field angle of the camera, and WD is the working distance.
It should be noted that the transmissive spatial light modulator 2 is a device that can modulate the relevant parameters of the light beam passing through the modulated light field, such as amplitude, polarization state, phase, etc., under control, and can modulate the parallel light emitted by the white parallel light source 3 into linearly polarized light for output. The upper surface of the transmission-type spatial light modulator 2 is covered with a layer of protective film, so that interference of dust, scratches and the like on collected images can be prevented, the detection precision of the device is ensured, and the service life of the device is prolonged. The distance between the upper surface of the transmissive spatial light modulator 2 and the sample 4 to be measured should be as small as possible.
It should be noted that the computer 10 can remotely operate the line CCD camera 1 through the driving software, and at the same time, can store the image data and perform defect identification.
It should be noted that the light shield 11 is outside the image capturing system for shielding the external light source, and the whole image capturing process is performed in the dark field.
Step one, a resolution ratio plate is placed above the transmission type spatial light modulator 2, the fixing table 8 and the telescopic rod 6 are adjusted, the linear array CCD camera 1 is fixed after being located at a proper working position and working distance, and the focal length is adjusted to enable imaging to achieve the best effect.
And step two, placing the light shield 11 and turning on the white parallel light source 3. When the detecting device has no sample 4 to be detected, the transmission type spatial light modulator 2 is adjusted until the image formed by the linear array CCD camera 1 is a completely black image, namely, an extinction phenomenon is generated.
And step three, placing one end of the sample 4 to be detected on the initial end of the conveying device 5, starting the conveying device 5, and when the sample 4 to be detected moves to a position between the transmission type spatial light modulator 2 and the linear array CCD camera 1 along with the traction of the roller, the linear array CCD camera 1 starts to scan and acquire images line by line, and transmits the images to the computer 10 for storage and processing.
And step four, performing linear transformation on the acquired defect image of the sample 4 to be detected, wherein the overall contrast of the image after the linear transformation is enhanced, and the detail information in the image is more prominent. The image linear transformation is to set the gray mapping relation of the input image g (x, y) and the output image f (x, y) as a linear function, and the mathematical expression is as follows, wherein k and b are linear transformation parameters:
f(x,y)＝k·g(x,y)+b
and fifthly, Gaussian filtering processing is carried out on the linearly transformed image, and the Gaussian filtering can eliminate noise interference generated after linear transformation. The filter function is expressed as follows:
and step six, adopting a first-order differential edge detection method to detect the defects of the filtered image. First, the gradient amplitude M (x, y) and direction θ (x, y) of the image G (x, y) obtained after gaussian filtering are calculated:
image G (x, y) is first order derivative in some direction d:
divide ∑ G (x, y) into two directions, x, y, to save computation time:
convolution calculation of ∑ G (x, y) with the original image:
calculate gradient magnitude M (x, y):
calculating gradient direction θ (x, y):
then, the gradient amplitude M (x, y) is subjected to a non-maximum suppression operation: comparing the current pixel point with two pixel points along the positive and negative gradient directions, if the gradient intensity of the current pixel point is greater than that of the other two pixel points, the pixel point is reserved as an edge point, otherwise, the gray value of the pixel point is set to be zero, and thus the purpose of edge thinning can be achieved.
And seventhly, judging the defect edge by using a double-threshold method. 5 pixel points and the number of overhigh threshold values are collected, wherein (i, j) is a pixel point, w is an image parameter, n is a definition parameter, and m is 1,2, … 5:
sequencing the 5 collected pixel points according to the gray value, and grading the pixel points:
n1＜n2＜n3＜n4＜n5
selecting pixels meeting the requirements by using double thresholds, and calculating the energy of the pixel points, wherein E is an energy value, and P is the grade of the pixel points:
and judging the defects according to the calculated pixel point energy value, namely judging the defects if the energy value is larger than the threshold value, and judging the defects if the energy value is smaller than the threshold value, wherein the defects do not belong to the defects of the transparent plate glass.
The schematic diagram of the light path is shown in fig. 3, and the light path direction is from the white parallel light source 3 to the transmission type spatial light modulator 2 to output linearly polarized light, and then to the linear array CCD camera 1 through the sample 4 to be measured. The sample 4 to be detected is imaged and acquired by the linear array CCD camera 1 to obtain a defect image, and the defect image is transmitted to the computer 10 to obtain a detection result after corresponding image processing.
The present invention has been described with reference to the embodiments shown in the drawings, and other embodiments can be proposed by those skilled in the art of detecting defects of transparent flat glass, but the present invention is not limited to the embodiments described above.
Claims (3)
1. A defect detecting apparatus for a transparent plate glass, comprising: the system comprises a linear array CCD camera (1), a transmission type spatial light modulator (2), a white parallel light source (3), a sample to be detected (4), a conveying device (5), supporting devices (6-9), a computer (10) and a light shield (11);
the supporting device is composed of a telescopic rod (6), a fastening piece (7), a fixed platform (8) and a base (9), the base (9) is fixed on the ground, the upper surface of the base is provided with a sliding chute, the upper part of the sliding chute is connected with the fixed platform (8), the telescopic rod (6) is arranged above the fixed platform (8), and the length of the telescopic rod is adjusted and fixed by the fastening piece (7);
the linear array CCD camera (1) is fixed at one end of a telescopic rod (6) in the supporting device, and the linear array CCD camera (1) is connected with a computer (10) and can be remotely controlled by the computer (10);
the sample (4) to be tested is placed on a conveying device (5);
the white parallel light source (3) is arranged inside the conveying device (5);
the transmission type spatial light modulator (2) is arranged above the white parallel light source (3);
the light shield (11) is arranged outside the linear array CCD camera (1).
2. The apparatus for detecting defects in a transparent flat glass as claimed in claim 1, further comprising: the transmission type spatial light modulator (2) can modulate light emitted by the white parallel light source (3) into linearly polarized light to be output;
the upper surface of the transmission type spatial light modulator (2) is covered with a layer of protective film;
the distance between the upper surface of the transmission-type spatial light modulator (2) and the lower surface of the sample (4) to be measured is required to be as small as possible.
3. The apparatus for detecting defects in a transparent flat glass as claimed in claim 1, further comprising: the main structure of the conveying device (5) is a programmable roller, and the sample to be detected (4) is placed on the conveying device (5) and moves along with the traction of the roller;
the speed of the movement of the roller pulling the sample (4) to be detected is determined by the image acquisition speed, the image processing speed and the defect detection precision.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110309A (en) * | 2023-10-18 | 2023-11-24 | 武汉市品持科技有限公司 | Glass film defect detection method, device and system |
| CN117630020A (en) * | 2024-01-25 | 2024-03-01 | 上海波创电气有限公司 | Detection device for surface defects of materials |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110309A (en) * | 2023-10-18 | 2023-11-24 | 武汉市品持科技有限公司 | Glass film defect detection method, device and system |
| CN117630020A (en) * | 2024-01-25 | 2024-03-01 | 上海波创电气有限公司 | Detection device for surface defects of materials |
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