KR20120065955A - Supersound auto sensing system - Google Patents

Abstract

PURPOSE: An automatic ultrasonic wave inspection system is provided to directly contribute to a balanced regional development and regional economy activation because job openings are offered by installing an aerogenerator. CONSTITUTION: An automatic ultrasonic wave inspection system comprises a detecting unit(100), a controller(200), and a display unit(300). The detecting unit is selectively adhered on a surface of an object composed of more than two kinds of composite materials, thereby scanning the object. The controller controls the scan operation of the detecting unit and ultrasonic scan result resolution by driving a program saved in advance. The display unit drives according to an input of display control signals supplied from the controller and displays images of a sound joining part and incomplete joining part.

Description

Ultrasonic Automated Inspection System {SUPERSOUND AUTO SENSING SYSTEM}

The present invention relates to an ultrasonic automated inspection system that can ensure the quality of the wind blade by confirming the internal structure of the wind blade formed of a composite material by a non-destructive inspection technique.

Recently, humanity's interest in the environment and energy is increasing. Representative issues are greenhouse gas emissions and fossil fuel depletion. In this regard, wind energy is in the spotlight as one of renewable energy sources. The advantages of wind energy include climate change and reduction of environmental pollutants, employment promotion and local industry growth, diversification of energy supply systems and substitution of energy imports, and reduction of disputes between countries and regions to secure energy security and acquire natural resources. .

For this reason, wind power has become the world's fastest growing sector in the energy industry. The evidence is that over the past 10 years, global installation capacity has increased by more than 12 times (total 2007, 94,005 MW). In particular, in the last five years, the annual average has increased by 22.3%. For reference, in Europe, which accounts for more than 42% of the world's wind power distribution, Denmark is responsible for 20% of the country's electricity supply. In Europe, wind is responsible for 3.7% of electricity, with 9% for Spain and 7.6% for Germany. Asia, on the other hand, is emerging as a new market and wind power accounts for 25.3% of the installed capacity in 2007.

In Korea, prototypes have been produced and commissioned since the 1970s. However, due to the immaturity of the surrounding conditions, the foreign company's system was copied without continuous technical development. In addition, the research and development started based on the "Alternative Energy Development Promotion Act" established in 1987 after staying in the characteristic study through the operation experiment of the system. Recently, the government has established the first National Energy Framework (2008-2030), which contains the roadmap for the development of new and renewable energy technologies, in order to keep up with the above-mentioned international trends. According to this, the importance of renewable energy is emerging as a next-generation growth engine that leads "green growth" as well as expanding energy security as a new paradigm of future vision and responding to climate change. In addition, the company set a goal of achieving 11% penetration rate in 2030 by establishing a mass distribution system in key areas. Among them, the distribution target for wind power was 7,301MW. Therefore, it aims to raise domestic technology to 80% of developed countries in 2011 and replace 1.4% of total generation with wind power, and 9.4% of total generation by 2020.

In addition, the renewable energy industry is an industry that is highly related to other industries. Therefore, if the market expands, the job creation effect is very high. Especially in the wind power generation industry, tower manufacturing, wind blades, gearboxes, power converters, generators, sophisticated parts assembly such as automobile industry, remote control devices, various automatic monitoring, and IT industries are mainly dominant. Is a sector that has a high competitiveness but is engaged in many human resources. In addition, since most of the sites where wind power generators are installed with wind power generators are used in mountainous areas, beaches and islands, jobs are created directly in areas where it is difficult to create jobs, which contributes directly to balanced regional development and revitalization of the local economy. .

According to the current state of the art in the field of wind power generation systems, wind blades have been developed up to about 40m in length and are expected to be large up to 60m in the future. Wind blades are designed and manufactured to ensure fatigue life over 30 years. In this regard, Korea's technology status is only 60% of the wind blade technology compared to developed countries, and only 70% of infrastructure construction. Furthermore, the technology level in the field of system monitoring, diagnosis and certification is very weak at 50 ~ 70%.

In conclusion, in order for domestic equipment and components to be competitive and foster as an export industry, it must meet the demanding quality standards required by global standards. In this regard, development of a non-destructive inspection automation system is urgently needed to secure the reliability of wind blade composite quality. Wind blades for wind power generation is a laminated structure of the composite material, so the ultrasonic attenuation is very severe in the composite material itself, and the material itself is nonhomogeneous, which makes general ultrasonic flaw detection difficult. In addition, composite materials with multiple materials are at risk of delamination in each layer during manufacture or use. If these defects are detected beforehand and perfect quality is obtained, they can lead to major catastrophic events.

In order to secure the quality of the wind turbine blades, the ultrasonic blade inspection method is used to secure the soundness of the wind blades, and the automatic inspection system provides an ultrasonic automated inspection system that can preserve the objective data permanently.

A detector which is selectively adsorbed on the surface of the test object formed of two or more composite materials to scan the test object, and controls the scanning operation of the detection part, and at least through scan data processing input through the detection part by controlling the driving of a pre-stored program. Calculates scan data in three steps (A, B, and C Scan), and utilizes the difference in amplitudes of the secondary and tertiary echoes detected at the interface of the test object, and displays a display control signal for displaying images of the healthy junction and the incomplete junction. And a control unit for controlling resolution of the ultrasonic scan result, and a display unit which is driven according to an input of a display control signal supplied from the control unit and displays an image of the healthy junction and the incomplete junction.

The detection unit includes a main unit including a frame extending in the longitudinal direction and a driving unit coupled to one side of the frame, a support coupled to the frame at both ends in the longitudinal direction of the main unit and disposed downward and a pneumatic pressure supplied from the outside. And a support part including an adsorption part for generating adsorption force, and a scan part driven according to external power and moved along the frame of the main part, and having one end contacting the surface of the test object to scan the test object.

The scan part includes a guide part having one side coupled to the driving part, one end of which is coupled to the guide part, and the other end includes a contact part contacting the test object, and an elastic part interposed between the guide part and the contact part to provide elasticity. Is inserted into the sensor may be provided with a constant elastic force from the elastic portion and the contact with the surface of the test body may include a ball-pren to maintain a predetermined interval.

In the wind power generation industry, tower manufacturing, wind blades, gearboxes, power converters, generators, and sophisticated parts assembly such as automotive industry, remote control, various automatic monitoring, and IT industries are mainly dominated by these industries. It has a lot of workforce.

If the reliability of wind blades is verified through quality assurance due to non-destructive testing, and safe facilities are secured in domestic and overseas markets, the market is expanded and employed because of the high relevance of other renewable energy industries. Creation effects may exceed expectations.

In addition, since most of the sites where wind power generators are installed with wind power generators are used in mountainous areas, beaches and islands, jobs are created directly in areas where it is difficult to create jobs, which contributes directly to balanced regional development and revitalization of the local economy. .

In addition, through the know-how of the characteristics and inspection method of the composite material, it is possible to explore the application of the same ultrasonic automated inspection method in the inspection of composite materials used in various industries as well as wind blades.

In addition, composite inspection technology has an effect that can affect other industries in the country through various applications.

1 is a view showing a cross-sectional structure and ultrasonic flaw detection of a wind blade composite.
2 is a diagram illustrating an amplitude change according to a bonding state.
3 is a diagram illustrating information to be obtained in the wind blade ultrasonic inspection.
4 is a diagram illustrating a state in which an inspector determines a defect by an A-Scan signal.
FIG. 5 is a diagram illustrating a signal representing an ultrasonic sound pressure or a time in a cross-sectional format on a plane perpendicular to the scan plane of the sensor as a B-Scan signal.
FIG. 6 is a diagram illustrating a signal representing a region of interest separated from a surface in a plane parallel to a scan plane of a sensor using a C-Scan signal.
FIG. 7 is a diagram illustrating a Principle of Ultrasonic C-Scanner Image.
8 is a block diagram of the ultrasonic automated inspection system according to an embodiment of the present invention.
9 is a view showing a state in which the detection unit is installed in the wind blade according to an embodiment of the present invention.
10 is a view showing a detection unit according to an embodiment of the present invention.
11 is a view showing a scan unit according to an embodiment of the present invention.
12 is a view showing a state of inspecting the wind blade using the ultrasonic automated inspection system according to an embodiment of the present invention.
FIG. 13 is a diagram illustrating an ultrasound C-Scan image detected by an ultrasonic automated inspection system according to an exemplary embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Wind turbine blades, which behave in a dynamic manner while hitting the wind, are made of composite materials that are formed by coating numerous layers. Composite materials have light and strong strength and are easy to manufacture large products. Wind turbine blades in wind turbines are becoming larger in order to increase power generation capacity. In order to secure safety and quality necessary for the trend of enlargement, it is necessary to combine non-destructive inspection technology.

Non Destructive Testing (NDT) technology is an inspection method that ensures the quality of a product by determining the discontinuity of the detection material without destroying the material when the material has non-uniform discontinuities on the surface and inside. Non-destructive testing includes radiographic testing (RT), which detects discontinuities inside the product using X-rays, gamma rays, and other radiations, and signals reflected from the product in consideration of the ultrasonic propagation coefficient and reflection coefficient inherent to high-frequency vibration. Ultrasonic Testing (UT), a non-thick product, which is not too thick among the non-magnetic products, is used for evaluating soundness based on the generated eddy current changes. Testing (ECT), which is applied to ferromagnetic products, is a magnetic particle test (MT) that is advantageous for the detection of discontinuities on the surface and directly below the surface, and is a penetration inspection method that can detect discontinuities with open surfaces that are difficult to observe with eyes. Various testing techniques, such as Penetrant Testing (PT), are used.

For large wind blades, application of non-destructive testing is essential. The only way to check the quality of the product from the point of purchase of the wind blades without directly participating in the production of the product is through a non-destructive test report. The fair nondestructive inspection by third parties can not only secure quality but also reasonably plan the manufacturing process, and narrow the technical gap with developed countries through the obtained data. This can take the advantage of technology by improving the reliability of the product. However, the domestic situation is completely unsatisfied with the manufacture and delivery, so the efforts for securing quality and improving reliability have been insufficient.

Since the wind blades are made of composite material, defects that peel off at the interface of the bonding layer are often detected. As such, ultrasonic detection is most advantageous for detecting plate-shaped discontinuities therein. However, due to the nature of the composite material, the multilayered layer has a great influence on the attenuation and scattering of the ultrasonic wave, so it should be inspected using low frequency and high energy. In addition, the conventional ultrasonic flaw detection method has a disadvantage in that the subjective judgment of the inspector and the storage of data are difficult. Therefore, it is important to obtain an objective test result through automatic inspection. Since wind blade composites are manufactured by combining and molding two or more materials, there is an interface between the reinforcement and the base material, unlike a single material. Since the mechanical, chemical and thermal properties of the materials are changed at these interfaces, they are relatively vulnerable to external impact, and the bonding state of the interface greatly influences the integrity of the composite material. Therefore, accurate diagnosis of the bonding state between dissimilar materials is very important for ensuring quality such as wind blade durability.

In general, composite materials composed of several heterogeneous materials have a very large energy loss of ultrasonic waves at the interface between the materials. Therefore, it is very difficult to check the interface state of the composite surfaces by general ultrasonic flaw detection. As a result, even in the case of the currently developed foreign equipment, the ultrasonic flaw detection results show that the two-dimensional image is very poor in terms of the reliability of the inspection. This result is said to show the limitations of ultrasonic flaw detection technology targeting multi-layered structures of composite materials such as wind blades, which causes the development of technology in Korea.

With regard to the ultrasonic flaw detection technology of composites, the following theoretical considerations confirmed the possibility of flaw detection. To summarize this briefly:

)는 매질에서의 음향속도(

)와 평균 밀도(ρ)와의 곱이 되며 임피던스가

,

인 두 개의 매질에 수직으로 입사하였을 대의 음의 세기 투과계수(power transmission coefficient),

와 음의 세기 반사계수(power reflection coefficient),

는 다음과 같다.When sound waves traveling in one medium meet the interface with another medium, reflected and transmitted waves are generated. Assuming that the interface is planar and the incoming wave is also a plane wave, the ratio of the sound pressure amplitude or sound pressure intensity of the reflected wave and the transmitted wave to the incident wave depends on the acoustic velocity, impedance, and incident angle of the incident wave in both media. Characteristic acoustic impedance of the medium (

) Is the speed of sound in the medium (

) Times the average density (ρ)

,

Negative power transmission coefficient when it is incident perpendicularly to two media,

And negative power reflection coefficient,

Is as follows.

On the other hand, the acoustic pressure of sound waves which decrease as a result of attenuation in the medium decreases exponentially. Since the amplitude of the measured echo is proportional to the sound pressure, it can be expressed as follows.

Here, α is measured by comparing the magnitude of the bottom reflection wave reciprocating between the plates in order to measure the sound pressure damping coefficient of the material by the sound pressure damping coefficient of the material.

Figure 2 (a) shows the joint of the dissimilar material. Acoustic waves incident on the surface of the test object are partially reflected and partially transmitted at the joints of dissimilar materials. In fully bonded condition, the amplitude of echo reflected at the interface depends on the negative intensity reflection coefficient of the interface between the two dissimilar materials, and in the case of complete delamination, the amplitude of sound pressure reflected at the separated interface is determined by the surface material and air. It depends on the negative intensity reflection coefficient.

, 트랜스듀서로부터 입사된 음압의 세기가

, 트랜스듀서와 소재 1 사이의 음의 세기 투과계수가

, 소재 1의 두께가

이고, 소재 1에서 음압 감쇠계수가 α, 소재 1과 소재 2의 접합 경계면에서 음의 세기 반사계수가

이고, 접합 경계면에서 박리된 영역의 면적이

일 때 표시부(CRT) 상에 나타나는 음압의 진폭은 다음과 같다.As shown in FIG. 2, when local peeling occurs, the amplitude of the reflected sound pressure varies depending on the peeling state and the area of the peeled part. Assuming that the separation at the interface is a complete separation of the two dissimilar materials, the size of the piezoelectric element in the transducer

, The intensity of sound pressure incident from the transducer

, The negative transmission coefficient between transducer and material 1

, The thickness of material 1

The negative pressure attenuation coefficient is α at material 1, and the negative intensity reflection coefficient at the junction of material 1 and material 2 is

And the area of the exfoliated area at the junction interface

When the amplitude of the sound pressure appearing on the display unit (CRT) is as follows.

는 박리된 부위에서 음의 세기 반사계수로, 소재 1과 소재 2의 박리에 의해 중간에 공기층을 가정하면

를 1로 간주할 수 있다.here

Is the negative intensity reflection coefficient at the exfoliated area, assuming that the air layer in between

Can be regarded as 1.

)에서 표시부에 나타나는 1차 및 2차 에코의 진폭은 다음과 같다.Therefore, complete bonding conditions (without peeling)

), The amplitudes of the primary and secondary echoes appearing on the display are as follows.

)일 경우 표시부에 나타나는 1차 및 2차 에코의 진폭은 다음과 같다.And assuming that the area of the peeled portion is as large as the size of the piezoelectric element, that is, the complete peeling conditions (

), The amplitudes of the primary and secondary echoes appearing on the display are as follows.

이므로 도 2(b)에 도시한 바와 같이 박리된 부위에서 반사되는 음압의 진폭이 완전 접합부에 비교하여 크게 나타나게 된다. 이때 1차 에코와 2차 에코의 진폭을 비교하면 다음과 같다.therefore

Therefore, as shown in FIG. 2 (b), the amplitude of the sound pressure reflected from the peeled portion is larger than that of the complete junction. At this time, comparing the amplitudes of the primary echo and the secondary echo is as follows.

As a result, considering the above equation, as shown in FIG. It can be seen that. Therefore, in the exemplary embodiment of the present invention, unlike the general flaw detection method, the image of the healthy junction part and the incomplete junction part is displayed by utilizing the amplitude difference of the second and third order echoes, and the resolution of the ultrasound scan result is improved to secure the reliability of the flaw detection result. Since the wind blade is a laminated structure of the composite material, ultrasonic attenuation is very severe in the composite material itself, and the material itself is nonhomogeneous, which makes it difficult to perform general ultrasonic inspection. In addition, composite materials with multiple materials are at risk of delamination in each layer during manufacture or use, and these defects can lead to major catastrophic failures if they are not detected in advance and perfect quality is obtained.

The joint quality inspection automation system of the wind blade composite according to the embodiment of the present invention is expected to make a significant contribution to securing the quality of the wind blade, thereby making a significant contribution to the overseas export of the wind power plant as well as import substitution effect. . Based on the above, it can be applied to wind blades made of composite materials. Figure 3 shows the defects of the wind blade to be examined in accordance with an embodiment of the invention. Referring to FIG. 3, thickness measurement as well as defects may be applied at the request of actual users.

As shown in FIG. 4, A-Scan refers to a signal represented by displaying an ultrasonic reflection signal on a time (distance) axis and sound pressure, such as an RF signal of an oscilloscope. In the manual inspection, the inspector judges the defect by almost A-Scan signal. B-Scan refers to a signal in which ultrasonic sound pressure or time is expressed in a cross-sectional format on a plane perpendicular to the scan plane of the sensor, and is shown in FIG. 5. As illustrated in FIG. 6, C-Scan refers to a signal representing a region of interest separated from the surface in a plane parallel to the scan surface of the sensor. In the case of an automated ultrasound system, all three scans are represented. Among them, the C-Scan image that can confirm the overall defect of the specimen is often printed and used together with the report.

In addition, when the reflected signal is represented as an image, sound pressure and time may be expressed in two ways. FIG. 7 is a diagram illustrating a Principle of Ultrasonic C-Scanner Image. Referring to FIG. 7, it is possible to implement a negative pressure image when the presence or absence of bonding of two kinds of joints is realized, and the change in the thickness of the bonded product may be known through a time image when the thickness of the bonding layer is quantitatively known.

First, as shown in the image of the sound pressure, the sound pressure of the reflected signal is a value related to the inherent elastic value of the test piece, as described above, and thus has different reflection values when the materials are different. When the image is acquired according to the intensity by using the differently reflected ultrasonic sound pressure, it is possible to detect the discontinuity in the material.

Looking at the image over time, the material has a unique sound pressure reflection value, so that the reflected sound pressure can be detected to produce an image with the propagation time of the ultrasonic wave. If the ultrasonic sound velocity in the material is known, the thickness of the material can be measured and the thickness can be represented by the image.

Where D is the distance from the transducer to the specimen and V is the ultrasonic velocity in the medium.

8 is a view showing a schematic diagram of the ultrasonic automated inspection system according to an embodiment of the present invention. Referring to FIG. 8, the ultrasonic automated inspection system according to an exemplary embodiment of the present invention includes a detector 100, a controller 200, and a display 300. The detection unit 100 is selectively adsorbed on the surface of the specimen formed of two or more composite materials to scan the internal defects and the interface of the specimen. The control unit 200 controls the scanning operation of the detection unit 100, and controls at least three steps (A, B, C Scan) through the scan data processing input through the detection unit 100 by controlling the driving of a pre-stored program. Compute the data. The control unit 200 generates a display control signal for displaying images of the healthy junction and the incomplete junction by using amplitude differences of the second and third echoes detected at the interface of the test object. The controller 200 controls the resolution of the ultrasound scan result. The ultrasonic automated inspection system is controlled by a program from a computer (PC), which is a control unit 200, and expresses A, B, and C scan data through data processing. All data provides accurate position information by feedback from the encoder. The control unit 200 includes a computer (PC), a printer, a keyboard, a mouse, a pulser / receiver, a motor driver integrated electric panel, which are the top controllers of the system, and the detection unit ( The drive unit 114 (motor) responsible for driving the respective axes of 100 is controlled. The outside of the control unit 200 is designed and manufactured by sheet metal welding, it may be installed on the floor to be convenient in the field. When the control unit 200 moves, a handle may be installed to move the container. The display unit 300 includes a monitor that is driven according to an input of a display control signal supplied from the controller 200 to display an image of the healthy junction and the incomplete junction.

9 is a view showing a state in which the detection unit 100 according to an embodiment of the present invention is installed in the wind blade that is the test body. The detector 100 is schematically illustrated in FIG. 9, and the entire assembly drawing is illustrated in FIG. 10. FIG. 10 is a diagram illustrating a detector 100 according to an embodiment of the present invention, and FIG. 11 is a diagram illustrating a scan unit 130 according to an embodiment of the present invention. 9 to 11, the detection unit 100 includes a main unit 110, a support unit 120, and a scan unit 130.

The main unit 110 includes a frame 112 extending in the longitudinal direction and a driving unit 114 coupled to one side of the frame 112. The main unit 110 functions to guide the movement of the inspection unit of the test object to move as much as the scan unit 130 to scan and set. The driving of the scan unit 130 may move by a combination of a pulley and a cam follower to a portion where the timing belt is connected. It can be driven reliably in the field of composite dust, and can respond quickly when the drive stops.

The support unit 120 is coupled to the frame 112 at both ends in the longitudinal direction of the main unit 110 and coupled to the support base 122 and the respective support bases 122 to generate adsorptive force by air pressure supplied from the outside. Adsorption unit 124 to include.

The scan unit 130 is driven according to external power to move along the frame 112 of the main unit 110, and one end thereof contacts the surface of the test object to scan the test object. The scan unit 130 has a guide portion 132 coupled to one side of the driving unit 114, one end of which is coupled to the guide portion 132, and the other end of the contact portion 136 that contacts the test object, and the guide portion 132. And an elastic portion 134 interposed between the contact portion 136 and providing elasticity. The contact part 136 includes a sensor inserted into the lower end and receiving a constant elastic force from the elastic part 134 and a ball-prenza in contact with the surface of the test object and maintaining a predetermined distance. The sensor is inserted into the bottom of the scan unit 130, and maintains a constant interval using the ball-pren at the bottom. The sensor includes an ultrasonic transmitter and an ultrasonic receiver, and the ultrasonic wave used in the sensor uses 1 MHz as the lowest frequency possible. When the sensor is manufactured so that the lowest frequency of the sensor is 0.5MHz, it is difficult to use in the embodiment of the present invention. The inspection is movable in the curvature direction (R direction) to enable inspection even at a radius of 650 mm, and the upper end has a tension function up and down by the elastic portion 134. The elastic unit 134 functions to make the ultrasonic wave well transmitted by contacting the wind turbine blades and the sensor with a constant force. The moving part of each axis of the scanning unit 130 is manufactured to enable smooth driving using the LM (LM) guide. Large specimens, such as wind blades, have a significant difference in thickness between the beginning and the end even when inspecting one specimen. To prepare for possible errors, step wedges with the same material as wind blades and varying thickness of various steps should be manufactured. This step wedge allows quantitative determination of the position of the defect and enables the measurement of the position or the thickness of the bonding portion to be correct.

Software (S / W) used in the control unit 200 according to an embodiment of the present invention works by using a LabVIEW (LabView 8.6) as a computer (PC) user interface (UI) program. The LabView program has the advantage of implementing algorithms faster and more intuitively than C or BASIC. The LabVIEW program can express A, B, and C Scan, and express C-Scan by dividing sound pressure and time. In addition, a fast Fourier transform (FFT) is implemented to check the frequency of the sensor used in the scan unit 130, and a Trusted Computing Group (TCG) function is used to prevent attenuation of the composite material. The motion driving of the driving unit 114 can be implemented to simply move the front and rear left and right by making a button. In addition, when setting the scan area of the test object, when teaching at the start position and the end position, the position is memorized and scanning starts. Ultrasonic automated inspection system according to an embodiment of the present invention can be confirmed by the user in real time through the display unit 300. Ultrasonic inspection system according to an embodiment of the present invention was applied to the wind blade of about 50M length by field test in KM of Gunsan. Ultrasonic examination was carried out in a clean state before the coating of the wind blade, and after the inspection of the wind blade, the glycerin used as the delivery medium of the ultrasonic wave was cleaned. Inspection results for the wind blades were obtained by ultrasonic C-Scan as shown in FIG. Referring to FIG. 13, the upper part is an image obtained by using a sound pressure, and the lower part is an image obtained by using a time axis. In the case of the time axis, it was also possible to see an image in which the fine layer layer was reduced. Also, the reflection of high sound pressure was confirmed at the position where the first layer layer was reduced, which is considered to be a defect caused by uneven bonding surface.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it is within the scope of the present invention.

100; Detection unit 110; Main
112; Frame 114; The driving unit
120; Support 122; support fixture
124; Adsorption unit 130; Scan
132; Guide section 134; Elastic part
136; Contact 200; Control
300; Display

Claims (4)

A detection unit which is selectively adsorbed on a surface of a test body formed of two or more composite materials to scan the test body;
A control unit which controls a scan operation of the detection unit and controls an ultrasound scan result resolution by driving a pre-stored program;
And a display unit driven according to an input of a display control signal supplied from the control unit to display an image of a healthy junction and an incomplete junction. The method of claim 1,
The control unit controls the scan operation of the detector, calculates the scan data in at least three steps (A, B, C Scan) through the scan data processing input through the detector by controlling the driving of a pre-stored program, An ultrasonic automated inspection system for generating display control signals for displaying images of a healthy junction and an incomplete junction by using amplitude differences of secondary and tertiary echoes detected at an interface of an inspection object, and controlling resolution of an ultrasonic scan result. The method of claim 2,
The detection unit
A main part including a frame extending in the longitudinal direction and a driving part coupled to one side of the frame;
A support part including a support part coupled to the frame and disposed downward from both ends of the main part in a longitudinal direction, and an adsorption part coupled to each of the support parts to generate an adsorption force by pneumatic pressure supplied from the outside;
Ultrasonic automated inspection system which is driven according to the external power is moved along the frame of the main portion, one end is in contact with the surface of the specimen to scan the specimen. The method of claim 3,
The scan unit
A guide part having one side coupled to the driving part;
One end is coupled to the guide portion, the other end is in contact with the test body, and
An elastic part interposed between the guide part and the contact part to provide elasticity,
The contact portion
An ultrasonic automated inspection system including a sensor inserted into a lower end and receiving a constant elastic force from the elastic part and a ball-prenza in contact with a surface of the test object and maintaining a predetermined distance.

Images