KR20200009905A - System for detecting defect and method for detectiing defect using the same - Google Patents

Abstract

Disclosed are a defect detection system and a defect detection method using the same. The defect detection method according to an embodiment of the present invention comprises: a step of forming a photoprint film as a photoprint unit of the defect detection system photoprints a film which is penetrated by radiation irradiated toward a pipe while in close contact with the pipe; a step of obtaining a first image as a scan unit of the defect detection system scans the print film firstly as a whole; a step of obtaining a second image as the scan unit scans secondly a specific part requiring detection of a defect in the first image; a step of detecting the defect of the pipe through the second image by a detection unit of the defect detection system; and a step of judging whether the detected defect satisfies defect criteria previously stored in a storage unit of the defect detection system by a determination unit of the defect detection system.

Description

Fault detection system and defect detection method using the same {SYSTEM FOR DETECTING DEFECT AND METHOD FOR DETECTIING DEFECT USING THE SAME}

The present invention relates to a defect detection system and a defect detection method using the same.

In general, in order to detect weld defects in pipes used in industrial plants, ships, and the like, radiation such as X-rays or gamma rays in a state in which an inspection film, for example, an AR (Analog Radiography) film, is adhered to the outer surface of the welded portion of the pipe. To the pipe. Next, the radiation-irradiated film irradiated toward the pipe is printed and the printed film (hereinafter referred to as 'print film') is placed on the film reader, and the print film is placed on the film reader. The image is converted into image files by shooting.

The image file converted as described above is used to detect pipe weld defects. Since the detection of pipe weld defects through the image file is performed by the human eye, the time required for detecting defects is very long. have.

In addition, the conventional film reader is not adjustable brightness can not be finely adjusted so that the image of the sharpest state appears while adjusting the brightness according to the density of the print film, the image file also can not obtain a clear image There is.

In addition, while the inspection film is the same size, the diameter of the pipe to which the inspection film should be attached and the thickness of the pipe vary widely, so that the position of the welded pipe in the image file converted from the print film and the print film is different. As it appears, it is troublesome to find the position of the pipe welds in the print film and the image file converted from the print film.

Korean Unexamined Patent Publication No. 10-2000-0009393 (published Feb. 15, 2000)

Embodiments of the present invention have been proposed in view of the problems of the prior art as described above, to provide a defect detection system and a defect detection method using the same that can greatly reduce the time required to detect defects of welds of various pipes. do.

According to an aspect of the present invention, in the method for detecting a defect in a pipe using a defect detection system, the flammable part of the defect detection system of the film transmitted through the radiation irradiated toward the pipe in a state in close contact with the pipe Forming a print film by printing at the; Obtaining a first image by first scanning the print film as a whole by the scanning unit of the defect detection system; Obtaining a second image by performing a second scan on a specific portion of the scan unit that requires a defect detection of the first image; Detecting a defect of the pipe through the second image in a detection unit of the defect detection system; And determining, by the determining unit of the defect detecting system, whether the detected defect satisfies a defect criterion previously stored in a storage unit of the defect detecting system.

The obtaining of the first image may include: recognizing piping information provided in the piping; Setting a scan range of the print film based on the pipe information; And obtaining the first image by first scanning the print film with the set scan range, thereby obtaining the first image.

In addition, the step of obtaining the first image, measuring the concentration of the print film; And irradiating light toward the print film, wherein the brightness of the light irradiated onto the print film may vary depending on the concentration of the print film.

The detecting may include determining a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image; And preprocessing the second image based on a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image.

The determining may include comparing the defects detected in the second image with previously stored first and second criteria; And when the defect detected in the second image satisfies both the first criterion and the second criterion, the defect detected in the second image is determined as a weld defect, and the detection detected in the second image is performed. If the defect satisfies only one of the first criterion and the second criterion, the second image is post-processed, and then the first criterion and the second pre-stored the defect of the post-processed second image. And comparing whether all of the criteria are satisfied.

According to another aspect of the present invention, a printing unit for forming a print film by printing a film transmitted through the radiation irradiated toward the pipe in a state in close contact with the pipe; A scanning unit which firstly scans the print film as a whole to obtain a first image, and secondly scans a specific portion requiring detection of a defect of the first image to obtain a second image; A detector for detecting a defect of the pipe through the second image; And a determination unit to determine whether the defect detected in the second image satisfies a previously stored defect criterion.

In addition, a pipe information recognition unit for recognizing the pipe information provided in the pipe; A film concentration measuring unit for measuring the concentration of the print film; A contrast grasping unit to grasp a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image; A light irradiation unit for irradiating light to the print film; And a control unit which receives data generated from the pipe information recognizing unit, the film concentration measuring unit, and the contrast grasping unit to control the scan unit, the light irradiation unit, and the detection unit.

The control unit may include: a scan range setting unit configured to determine a welded portion of the first image by setting a scan range of the print film based on the pipe information recognized by the pipe information recognition unit; A brightness adjusting unit for adjusting the brightness of light irradiated toward the print film according to the concentration measured by the film concentration measuring unit; And an image processor configured to process the second image based on a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image identified through the contrast grasping unit. .

The defect detection system and the defect detection method using the same according to embodiments of the present invention have an effect of greatly reducing the time required to detect defects in welds of various pipes.

1 is a block diagram illustrating a defect detection system according to an exemplary embodiment of the present invention.
2 is a flowchart illustrating a defect detection method according to an embodiment of the present invention.
3 is a flowchart illustrating a method of obtaining a first image in the defect detection method of FIG. 2.
4 is a flowchart illustrating a method of determining whether the defect detected in the second image satisfies a previously stored defect criterion in the defect detecting method of FIG. 2.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the embodiment of the present invention. The following description is one of several aspects of the patentable invention and the following description may form part of the detailed description of the invention.

However, in the description of the present invention, a detailed description of known configurations or functions may be omitted for clarity of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood as including all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by such terms. These terms are only used to distinguish one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Hereinafter, a defect detection system according to an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a defect detection system 1 according to an exemplary embodiment of the present invention may include a print unit 10, a pipe information recognition unit 20, a film concentration measurement unit 30, a scan unit 40, The light irradiation unit 50, the contrast grasping unit 60, the detection unit 70, the determination unit 80, the control unit 90 and the storage unit 100 may be included.

The print unit 10 may form a print film by printing a test film, for example, an AR (Analog Radiography) film, through which radiation irradiated toward the pipe is in contact with the pipe.

The pipe information recognizing unit 20 may recognize the pipe information described on the outer surface of the pipe. Here, the pipe information may include character information such as diameter size of the pipe, thickness of the pipe, and the like. For example, the pipe information recognition unit 20 may be provided as a camera that can take pictures of the pipe. The pipe information recognized by the pipe information recognition unit 20 may be converted into data and transferred to the control unit 90. The pipe information transmitted to the control unit 90 may be utilized to set the scan range of the scan unit 40.

The film concentration measuring unit 30 may measure the concentration of the print film. The concentration value of the print film measured by the film concentration measuring unit 30 may be data and transferred to the control unit 90. For example, the film concentration measuring unit 30 may include a film concentration measuring instrument. The concentration value of the print film transferred to the control unit 90 may be used to adjust the brightness of the light irradiated from the light irradiation unit 50.

The scan unit 40 may firstly scan the print film as a whole to obtain a first image, and secondly scan a specific portion requiring detection of defects in the first image to obtain a second image.

In this case, the primary scan refers to a scan operation for searching a welded portion of a pipe included in a defect film, for example, a print film, and the secondary scan identifies the welded portion of the pipe searched through the primary scan in more detail. Means a scan operation to As a result, the primary scan speed is relatively faster than the secondary scan speed so that the image quality of the first image formed by the primary scan may be lower than that of the second image formed through the secondary scan.

Meanwhile, a scan range in which the scan unit 40 scans the print film may be set based on the pipe information recognized by the pipe information recognition unit 20. The reason for setting the scan range of the scan unit 40 will be briefly described. Since the size of the inspection film is the same, the diameter of the pipe to which the inspection film is attached, the thickness of the pipe, and the like are very diverse. This is because the pipe welds are differently positioned in the first image file formed by the first scan.

The light irradiation unit 50 may assist the print film to display a clear image by irradiating light toward the print film.

The light irradiator 50 may be controlled by the control unit 90, and the brightness of light irradiated onto the print film may be adjusted according to the concentration of the print film measured by the film concentration measuring unit 30.

The light irradiation unit 50 may be, for example, at least one light emitting diode disposed under the pipe 2, but this is merely an example, and the inventive concept is not limited thereto.

The contrast grasping unit 60 is a degree of contrast between a portion where a defect exists in the second image (hereinafter referred to as a 'defect portion') and a portion except for a portion where the defect exists (hereinafter referred to as a 'peripheral portion'). Can be identified. The degree of contrast between the defective part and the peripheral part identified by the contrast grasping unit 60 may be converted into data and transmitted to the control unit 90. The data of the contrast grasping unit 60 transmitted to the control unit 90 may be used to determine the degree of pre-processing or post-processing of the second image.

The detection unit 70 may detect a defect in the pipe through the second image. In this case, the second image transferred to the detector 70 may be in a pre-processed or post-processed state. Here, the pre-processing and the post-processing mean a process of individually adjusting the color components of the red component, the green component and the blue component of the image.

The determination unit 80 may determine whether the defect detected in the second image satisfies a defect criterion previously stored in the storage unit 100, and determine whether the defect detected in the second image corresponds to a weld defect.

When the defect detected in the second image satisfies the defect criteria previously stored in the storage unit 100, the determination unit 80 determines the position of the defect by determining the defect detected in the second image as a weld defect, The defect rate of the defect can be calculated. Here, the defect rate refers to the degree to which a defect detected in the second image satisfies a defect criterion previously stored in the storage 100.

In addition, when the defect detected in the second image does not satisfy the defect criteria previously stored in the storage unit 100, the determination unit 80 determines that the defect detected in the second image is not a weld defect, Know the expected location and calculate the expected defect rate.

The control unit 90 receives data generated from the pipe information recognizing unit 20, the film concentration measuring unit 30, and the contrast detecting unit 60, and scan unit 40, light irradiation unit 50, and detection unit 70. ) Can be controlled.

The control unit 90 sets the scan range of the print film based on the pipe information recognized by the pipe information recognizing unit 20 to scan the setting range 91 and the film concentration measuring unit to grasp the weld of the first image. According to the concentration measured by 30, the portions and defects in which the defects exist in the second image determined by the brightness adjusting unit 92 and the contrast grasping unit 60 which adjust the brightness of the light irradiated toward the print film are detected. It may include an image processing unit 93 for processing the second image based on the degree to which the portion except the existing portion is contrasted.

The storage unit 100 may store data necessary for the operation of the control unit 90 and data processed by the control unit 90.

The storage unit 100 may store a deep learning algorithm learned by classifying defect criteria by cause and type, and a deep learning algorithm learned about the entire print film. At this time, the defect criteria include the degree of defect, the depth of penetration lack, the total length of lack of melt, the lack of fusion, the lack of penetration, the size and distribution of the internal pores, the length and width of the slag / tungsten inclusions, the depth of the undercut, the surface roughness, the root It may be a reference for the depth of the concave.

On the other hand, the deep learning algorithm learned by classifying the defect criteria by the cause and the shape may be used as the first criterion when the determination unit 80 determines the defect of the second image, and the defect criterion is applied to the entire print film. The learned deep learning algorithm may serve as a second criterion while the determination unit 80 determines a defect of the second image. The determination of whether the defect in the second image corresponds to a weld defect using the first criterion and the second criterion will be described later.

Hereinafter, a defect detection method according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4.

2 to 4, a defect detection method according to an embodiment of the present invention includes a print unit 10 of a defect detection system 1 in which a film through which radiation is irradiated toward a pipe is in contact with a pipe. ) To form a print film by printing in step S100, and to obtain a first image by first scanning the print film as a whole by the scan unit 40 of the defect detection system 1 (S200), and the scan unit 40. To obtain a second image by performing a second scan on a specific portion requiring defect detection of the first image (S300), and the defect of the pipe through the second image in the detection unit 70 of the defect detection system 1. (S400) and determining whether the detected defects satisfy the defect criteria stored in the storage unit 100 of the defect detection system 1 by the determination unit 80 of the defect detection system 1 ( S500) may be included.

First, in a state in which the print unit 10 is in close contact with a pipe, a print film is formed by printing a film through which radiation is transmitted toward the pipe (S100).

Next, the pipe information recognition unit 20 recognizes the pipe information of the pipe (S210), the recognized pipe information is data is transferred to the scan range setting unit 91 of the control unit 90, the scan range setting unit The scanning range of the scanning unit 40 is set by the reference numeral 91 (S220).

In addition, the film concentration measuring unit 30 measures the concentration of the print film (S230), the measured concentration value is data is transmitted to the brightness adjusting unit 92 of the control unit 90, brightness control unit 92 By the brightness of the light irradiated to the print film from the light irradiation unit 50 is adjusted (S240). As a result, a first image of low quality is formed through the scan unit 40 (S250).

Once the first image is formed, the scan unit 40 second scans the weld of the first image. In this case, the speed of the second scan is set to be slower than the speed of the first scan so that a second image of high quality is formed through the scan unit 40 (S300).

Next, the detection unit 70 preprocesses or post-processes the second image by using the degree of contrast between the portion where the defect exists and the portion except the portion where the defect exists in the second image identified by the contrast grasping unit 60. After processing, the defect of the pipe is detected through the second image (S400).

When a defect of the pipe is detected through the second image, the determination unit 80 determines whether the detected defect of the second image satisfies a defect criterion (S500). Here, the defect of the second image means a defect of the pipe that is visually recognized through the second image.

Specifically, the determination unit 80 compares the defect of the second image detected by the detection unit 70 with the first reference and the second reference previously stored in the storage unit 100 (S510), and then detects the second image. It is determined whether the defective defect satisfies both the first criterion and the second criterion previously stored in the storage 100 (S520).

When the defect detected in the second image satisfies both the first criterion and the second criterion previously stored in the storage unit 100, the defect detected in the second image is determined as a weld defect, and the position of the defect is determined. The defect rate of the defect may be calculated (S530).

The determination unit 80 determines that the defect of the second image detected by the detection unit 70 does not satisfy only one of the first reference and the second reference previously stored in the storage unit 100 (S540).

If it is determined that the defect of the second image detected by the detector 70 does not satisfy both the first criterion and the second criterion previously stored in the storage unit 100, the defect of the second image is welded. Determine that it is not a defect and complete the work.

In contrast, if it is determined that the defect of the second image detected by the detector 70 does not satisfy any one of the first criteria and the second criteria previously stored in the storage 100, the second controller determines that the second image is not satisfied. After the image is post-processed (S550), it is again compared whether the defect of the post-processed second image satisfies both the first criterion and the second criterion previously stored in the storage unit 100.

As a result of the comparison, when the defect of the post-processed second image satisfies both the first criterion and the second criterion previously stored in the storage unit 100, the defect detected in the second image is determined as a weld defect and the previously stored agent is determined. If it is determined that both the first criterion and the second criterion are not satisfied, it is determined that the defect of the second image is not a weld defect, and the operation is completed.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or replace the embodiments in a form that is not clearly disclosed in the embodiments of the present invention, this is also the present invention It will not go beyond the scope of the. Therefore, the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and such modified embodiments should be included in the technical spirit described in the claims of the present invention.

1: defect detection system 10: printing unit
20: pipe information recognition unit 30: film concentration measuring unit,
40: scanning unit 50: light irradiation unit
60: contrast grasping unit 70: detection unit
80: determination unit 90: control unit
100: storage unit

Claims (8)

In a method for detecting a defect in a pipe using a defect detection system,
Forming a print film by printing a film through which radiation irradiated toward the pipe in a state of being in close contact with the pipe is printed in a print part of the defect detection system;
Obtaining a first image by first scanning the print film as a whole by the scanning unit of the defect detection system;
Obtaining a second image by performing a second scan on a specific portion of the scan unit that requires a defect detection of the first image;
Detecting a defect of the pipe through the second image in a detection unit of the defect detection system; And
Determining, by the determining unit of the defect detecting system, whether the detected defect satisfies a defect criterion previously stored in a storage unit of the defect detecting system;
Fault detection method. The method of claim 1,
Obtaining the first image,
Recognizing piping information provided in the piping;
Setting a scan range of the print film based on the pipe information; And
Obtaining the first image including a weld by first scanning the print film with the set scan range to obtain the first image.
Fault detection method. The method of claim 2,
Obtaining the first image,
Measuring the concentration of the print film; And
Further comprising irradiating light toward the print film;
The brightness of the light irradiated on the print film depends on the concentration of the print film,
Fault detection method. The method of claim 1,
The detecting step,
Identifying a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image; And
Preprocessing the second image based on the degree of contrast between the portion where the defect exists and the portion except the portion where the defect exists in the second image;
Fault detection method. The method of claim 1,
The determining step,
Comparing the defects detected in the second image with previously stored first and second criteria; And
If the defect detected in the second image satisfies both the first criterion and the second criterion, the defect detected in the second image is determined as a weld defect, and the defect detected in the second image is determined. When only one of the first criterion and the second criterion is satisfied, the first criterion and the second criterion are pre-stored after the second image is processed, and then the defects of the post-processed second image are previously stored. Comparing whether all are satisfied,
Fault detection method. A print unit which forms a print film by igniting a film through which radiation is irradiated toward the pipe while being in close contact with the pipe;
A scanning unit which firstly scans the print film as a whole to obtain a first image, and secondly scans a specific portion requiring detection of a defect of the first image to obtain a second image;
A detector for detecting a defect of the pipe through the second image; And
And a determination unit to determine whether the defect detected in the second image satisfies a previously stored defect criterion.
Fault detection system. The method of claim 6,
A pipe information recognizing unit recognizing pipe information provided in the pipe;
A film concentration measuring unit for measuring the concentration of the print film;
A contrast grasping unit to grasp a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image;
A light irradiation unit for irradiating light to the print film; And
Further comprising a control unit for receiving the data generated from the pipe information recognition unit, the film concentration measuring unit and the contrast grasping unit to control the scanning unit, the light irradiation unit and the detection unit,
Fault detection system. The method of claim 7, wherein
The control unit,
A scan range setting unit configured to determine a weld of the first image by setting a scan range of the print film based on the pipe information recognized by the pipe information recognizing unit;
A brightness adjusting unit for adjusting the brightness of light irradiated toward the print film according to the concentration measured by the film concentration measuring unit; And
And an image processor configured to process the second image based on a degree of contrast between a portion in which the defect exists and a portion except the portion in which the defect exists in the second image identified through the contrast grasping unit.
Fault detection system.

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