KR100962591B1 - Portable apparatus for inspecting crack using active millimeter wave - Google Patents

Abstract

PURPOSE: A portable device for inspecting a crack using active millimeter waves is provided to miniaturize the device by efficiently arranging each module, and to enable a user to conveniently use the device. CONSTITUTION: A portable device for inspecting a crack using active millimeter waves comprises a transmitting unit(210), a receiving unit(220), a driving unit(222), an image processing unit(230), and a display unit(260). The transmitting unit radiates a millimeter wave signal to an object. The receiving unit receives the millimeter wave signal reflected from the object. The driving unit changes the direction of the signal in order to allow the receiving unit to receive the signal. The image processing unit processes the received signal. The display unit displays a millimeter wave image.

Description

Portable apparatus for inspecting crack using active millimeter wave

The present invention relates to a crack inspection technology using a millimeter wave, and more particularly, using an active millimeter wave to ensure the reliability and safety of the crack inspection irrespective of the type of the object, and user convenience and crack detection when performing the inspection Portable crack inspection apparatus for improving the ease of use.

In general, materials such as metal or stone will be cracked with time or changes in external environment. These cracks are gradually changed from the initial fine form to the larger form over time, which results in the collapse of the machine or building itself consisting of metal or stone skeleton.

Therefore, although methods such as regular visual inspections are used to detect such cracks and prevent human and property damage, it is now common to use non-destructive inspection methods to improve the accuracy and reliability of crack detection.

One of the crack detection methods by non-destructive inspection is a method of transmitting radiation such as X-rays, γ-rays and β-rays. In particular, X-rays are commonly used in radiographic tests, where wires of various thicknesses of the same material are placed on a flat plate of the same thickness and photographed with X-rays to show the existence of each line. By adjusting the exposure time the size of the detectable defect is determined.

However, in the case of a radiographic test, since the radiation transmitting device itself occupies a considerable volume, it is difficult to use in a small workplace, and there are safety problems and environmental problems due to radiation exposure, as well as permeation depending on the type of medium. As the depth is different, there is a problem in that cracks inside the test material cannot be detected when the penetration depth is insufficient.

Other methods of crack detection by non-destructive testing include ultrasonic flaw detection, eddy current tests, etc., to investigate scratches and internal defects in steel plates, forgings, pipes, etc., or infiltration methods to detect small scratches on the surface of articles. Magnetic particle inspection is also used. The ultrasonic flaw detection is based on the principle that when the ultrasonic wave from the oscillator is put on one side of the article to receive sound waves reflected from the other side, if there is a defect inside, the wave reflected from the defect returns. Way. The eddy current is a crack detection method that detects a defect by flowing a eddy wave in an article by a method such as high frequency induction and disturbing the current. The penetrating method or magnetic particle inspection method is applied to a flaw surface by injecting a liquid substance containing a pigment or a phosphor and soaking the surface, and then washing the surface well. It is a crack detection method to find a flaw by releasing it. On the other hand, in steel materials, it is possible to perform a flaw detection with colored magnetic powder by taking advantage of the fact that the magnetic flux of the flaw is intensified and the magnetized iron powder sprayed on the surface is attracted.

However, in the case of the ultrasonic flaw detection, the crack detection by the ultrasonic flaw detection is virtually impossible in the case of a medium in which sound wave transmission is not easy because sound waves are used. In the case of the eddy current method, there is a problem that crack detection is virtually impossible in the case of an unconducted article. In addition, in the case of the penetration method or magnetic particle detection method, there is a problem in that there is an application limitation in that a separate detection material is used.

Therefore, the technical problem to be solved by the present invention, using the active millimeter wave, regardless of the type of the object to ensure the reliability and safety of the crack inspection, portable cracks to improve the user convenience and ease of crack detection when performing the inspection It is to provide an inspection apparatus.

In order to solve the above technical problem, the present invention, a transmitter for radiating a millimeter wave signal to the inspection object; A receiver configured to receive a reflected wave signal of the millimeter wave signal from an inspection region of the inspection object; An image processor configured to process the received reflected wave signal to generate an image signal representing a crack portion of the inspection area as a color image so as to be distinguished from a non-cracked portion; And a display unit for displaying a millimeter wave image of the inspection area by the image signal.

The image processor may be configured to calculate a voltage value of the received reflected wave signal, and when the calculated voltage value corresponds to a predetermined voltage range indicating a voltage value of the reflected wave caused by the crack portion. The image signal representing the pixel of the crack portion corresponding to the calculated voltage value in the millimeter wave image in a color distinguished from the remaining pixels is generated.

In example embodiments, the image processor may be configured to change one or more of the color, brightness, and saturation of the pixel of the crack according to the magnitude of the calculated voltage value corresponding to the predetermined voltage value range. Create

The crack inspection apparatus may further include a warning unit that generates a warning signal when the number of pixels of the crack portion occupies a predetermined threshold value or more in the millimeter wave image.

In one embodiment, the crack inspection apparatus, the portable crack inspection apparatus using an active millimeter wave, characterized in that the receiver further comprises a drive unit for changing the receiving direction of the receiver so that the receiver receives the reflected wave from the inspection area. .

In one embodiment, the crack inspection apparatus further comprises a housing in which the transmitter, the receiver, the image processing unit and the display unit is installed, the transmitter and the receiver emit the millimeter wave signal from the rear side of the housing and It is installed to receive the reflected wave, the display unit is installed to display the millimeter wave image on the front side of the housing, and the housing includes a gripping portion for the user to grip on the front side.

In an embodiment, the housing may include a main body forming the gripping portion and a flip cover connected to one end of the main body by a hinge to open and close the main body, and the display may include the flip cover. Is installed on the inner surface of the

In one embodiment, the housing further includes an inspection region display unit formed on the front side to display the inspection region so that a user can recognize the inspection region.

In one embodiment, the housing further includes a ball for movement provided on the rear side to facilitate the movement of the crack inspection device on the surface of the inspection object.

In one embodiment, the crack inspection apparatus further includes an input unit that is installed on one side of the housing to receive a user signal to initiate a crack inspection for the inspection area.

In one embodiment, the crack inspection apparatus, the storage unit for storing the image signal; And an input unit installed at one side of the housing to receive a user signal for storing the image signal in the storage unit.

In one embodiment, the crack inspection apparatus further includes a power supply unit installed inside the housing to supply power to operate the crack inspection apparatus.

In addition, the present invention to solve the above technical problem, the transmitter for radiating the millimeter wave signal to the inspection object; A receiver configured to receive a reflected wave signal of the millimeter wave signal from an inspection region of the inspection object; An image processor which processes the received reflected wave signal to generate an image signal; A display unit configured to display a millimeter wave image of the inspection area by the image signal; And a housing in which the transmitting unit, the receiving unit, the image processing unit, and the display unit are installed, wherein the transmitting unit and the receiving unit radiate the millimeter wave signal at the rear side of the housing and receive the reflected wave. It is installed to display the millimeter wave image on the front side of the, and the housing provides a portable crack inspection apparatus using an active millimeter wave including a gripping portion for allowing the user to grip on the front side.

The present invention provides an advantage of ensuring the reliability and safety of crack inspection regardless of the type of object to be inspected by using an active millimeter wave signal as an inspection signal. It also provides the advantage of improving the ease of crack inspection by colorizing the cracks appearing in millimeter images and warning of crack occurrences. Furthermore, by efficiently disposing each component module, it is possible to reduce the size and portability of the crack inspection apparatus and improve user convenience.

Prior to the description of the specific contents of the present invention, the technical outline of the present invention will be described first for ease of understanding.

The present invention focuses on the fact that a millimeter wave can effectively penetrate a non-conductive material such as plastic or building concrete, and thus can detect the internal crack of a building very effectively. That is, all objects have different ratios of reflecting millimeter waves (emissivity), and when a crack occurs, the emissivity is changed by a pupil formed in the crack. Therefore, it is possible to detect the crack by detecting a change in the reflectance ratio of the millimeter wave signal reflected from the object.

1 shows the effective emissivity of ordinary objects at various frequencies.

In general, the frequency band of the millimeter wave signal is in the range of 30 ~ 300GHz, but may be applied to the present invention as long as it is included in the frequency band that can detect whether the crack penetrates the inside of the inspection object.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify a solution of the technical problem of the present invention. However, in describing the present invention, when the description of the related known technology makes the gist of the present invention unclear, the description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users, operators, and the like. Therefore, the definition should be made based on the contents throughout the specification. Also, like reference numerals in the accompanying drawings denote like elements.

2 shows an example of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

2, the portable crack inspection apparatus according to the present invention may include a transmitter 210, a receiver 220, an image processor 230, a controller 250, and a display unit 260, and an input unit 240. ) May further include a warning unit 270, a storage unit 280, and a power supply unit 290.

The transmitter 210 generates a millimeter wave and radiates it to an object to be inspected. To this end, the transmitter 210 may include a millimeter wave voltage controlled oscillator (VCO) and a transmit antenna. As described above, the portable crack inspection apparatus according to the present invention applies a so-called active millimeter wave method, which is a method of oscillating millimeter waves by itself in crack inspection.

The receiver 220 receives the reflected wave signal of the millimeter wave signal from the inspection region 200 of the inspection object. To this end, the portable crack inspection apparatus according to the present invention may further include a driver 222 for changing the receiving direction of the receiver 220 so that the receiver 220 receives the reflected wave from the inspection area 200. Can be.

The driver 222 drives the motor according to a control signal of the controller 250 to change the direction of the receiving antenna of the receiver 220 in the inspection area 200 according to a preset profile. For example, the driving unit 222 may be implemented as a pan / tilt device capable of rotating up, down, left and right. As an example of the operation of the pan / tilt device, it may be moved at 2.5 ° intervals in the range of 320 ° left and right and 50 ° up and down through RS-232 communication.

3A to 3C illustrate a scan operation of the receiver 220 with respect to the inspection area 200.

As shown in FIGS. 3A to 3C, the receiving unit 220 may perform scanning by dividing the inspection area 200 into, for example, a 5 × 5 matrix in order to receive reflected waves. The size of each unit cell constituting the inspection area 200 represents a size of a unit area in which the receiver 220 may receive the reflected wave signal for a predetermined time fixed at a specific position. Therefore, the size and number of each unit cell may be variously set according to the reception performance of the receiver 220, the width of the inspection area 200, and the like.

For the scan operation of the receiver 220, the driver 222 may be configured within the inspection area 200 according to a preset rotation rule such as a rotation direction, a rotation angle, and a fixed time at a specific position of the receiver 220. The receiving unit 220 changes the receiving direction. The rotation direction is, for example, when scanning based on a row as shown in FIG. 3A, when scanning based on a coloum as shown in FIG. 3B, starting from the matrix components C1 and R1 as shown in FIG. 3C. The direction or order in which the inspection area 200 is scanned, such as when each matrix component is scanned clockwise to the matrix components C3 and R3. The rotation angle is, for example, an angle that the receiver 220 rotates to scan the next matrix component after scanning a specific matrix component as shown in FIG. 3A. The fixed time at the specific position refers to the time required for receiving the reflected wave signal for each matrix component.

Meanwhile, in order to implement a portable crack detection apparatus according to the present invention, it is preferable to miniaturize each component such as the transmitter 210 and the receiver, and the transmitter 210 and the receiver 220 actually depend on the application environment. It can be implemented in a single module of 2 cm x 3 cm.

Next, the image processor 230 processes the received reflected wave signal to generate an image signal. In one embodiment, the image processor 230 may generate the image signal representing the crack portion of the inspection area as a color image by processing the received reflected wave signal. To this end, the image processor 230 may include an amplifier 232, a detector 234, an AD converter 236, and an image signal generator 238.

4 illustrates an example of an image processing method performed by the image processor 230 in a flowchart.

Referring to FIG. 4, first, the amplifier 232 amplifies the reflected wave such as weak thermal noise through a low noise amplifier (S410). Next, the detector 234 converts the signal amplified by the amplifier 234 into a DC voltage (S420). Next, the AD converter 236 converts the DC voltage into a digital signal through an analog to digital converter (ADC) (S430). As such, the received reflected wave signal may be transmitted to the image signal generator 238 in the form of a digital signal through the amplifier 232, the detector 234, and the AD converter 236.

Then, the image signal generator 238 may generate an image signal for the received reflected wave by using the digital signal. In this case, the image signal generator 238 may obtain an average value of 50 samples by converting the digital signal into a signal of 20 Hz or less through a digital IIR filter configured in a third order. As a result, the image signal generator 238 may calculate the voltage value of the reflected wave received at predetermined time intervals (S440).

Next, the image signal generator 238 determines whether the calculated voltage value falls within a predetermined voltage value range representing a cracked portion of the inspection object (S450). The predetermined voltage range representing the cracked portion is, for example, a threshold value for distinguishing the cracked portion from the non-cracked portion by measuring the voltage of the reflected wave received at the cracked portion of the shape to be detected from the inspection target objects through a preliminary experiment. Can be determined by definition. In addition, the average voltage of the reflected wave by the non-cracked portion of the object to be inspected is measured, or in general, the average voltage of the reflected wave received from the object to be inspected is determined in consideration of the extremely small area occupied by the cracked portion of the object. This can be determined by measuring and defining a threshold. When the voltage value of the reflected wave received during the actual crack inspection is smaller than the predetermined threshold value, that is, within the predetermined voltage value range, the inspection region 200 corresponding to the calculated voltage value may be used. The part can be judged as a crack part.

Next, the image signal generator 238 displays a pixel of a crack portion corresponding to the calculated voltage value within the predetermined voltage value range in a color distinguished from the remaining pixels in the entire millimeter wave image. The image signal is generated (S460).

In an embodiment, the image processor 230 may change one or more of the color, brightness, and saturation of the pixel of the crack part according to the magnitude of the calculated voltage value corresponding to the predetermined voltage value range. The image signal may be generated. This process may be implemented by dividing the predetermined voltage value range into a predetermined number of levels and mapping color information in which one or more of color, brightness, and saturation are changed to each level. As described above, in the case where the millimeter wave image is configured by varying the color, brightness, or saturation according to the voltage values calculated for the pixels of the cracked portion, as a user, not only the presence of the gold crack, but also the shape and risk of cracking, etc. It can provide an advantage that can be predicted.

The time point at which the image processor 230 generates the image signal may vary. Three examples of the viewpoints of the video signal will be described.

First, the image processor 230 may generate an image signal for the entire inspection area 200 after reception of the reflected wave signal for the inspection area 200 is completed. For example, the reflected wave signal is received for the entire inspection area 200. The reflected wave signal for the entire inspection area 200 is stored in the storage unit 280. The reflected wave signal stored in the storage unit 280 may be configured as a millimeter wave image through the image processor 230.

Second, the image processor 230 may generate an image signal whenever the reflected wave signal is received at predetermined time intervals. For example, the reflected wave signal received for each of the matrix components constituting the inspection area 200 may be configured as a millimeter wave image through the image processor 230.

Third, the image processor 230 may generate an image signal by receiving a reflected wave signal for a plurality of matrix components of the inspection area 200. For example, five matrix components of the inspection area 200 of FIG. 3A may be scanned, and the scanned five matrix components may be composed of millimeter wave images through the image processor 230. In this case, the number of matrix components processed at one time by the image processor 230 may be changed according to the capacity of the storage unit 280 and the processing speed of the image processor 230.

Next, the display unit 260 displays a millimeter wave image of the inspection area by the image signal generated by the image processor 230. The display unit 260 may be embodied as a liquid crystal display (LCD), an organic light emitting diode (OLED), or the like to express the crack part in color.

5A and 5B show millimeter wave images generated in accordance with the present invention.

As shown in FIG. 5A, the image processor 230 generates an image signal having a size of 400 × 400 pixels, which is converted to a gray level using a minimum-maximum value range of the measured reflected wave voltage values. can do. In addition, as illustrated in FIG. 5B, the image processor 230 may map the color to the pixel of the crack so that the user may more easily predict the presence of the crack as well as the shape and risk of the crack. do. According to an exemplary embodiment, the pixels of the non-cracked portion may also be realized as a specific color image, and the color of the cracked portion and the non-cracked portion may be configured in a complementary color relationship to further increase the clarity.

In addition, the portable crack inspection apparatus according to the present invention may further include a warning unit 270 for generating a warning signal when a crack is detected in the inspection region 200. For example, the controller 250 may determine a ratio of pixels of the crack portion in the millimeter wave image, and the warning unit 270 may generate a warning signal according to the determination result of the controller 250. That is, the warning unit 270 may generate a warning signal such as a visual, audio, or tactile event when the number of pixels of the crack portion occupies a predetermined threshold value or more in the millimeter wave image. To this end, the warning unit 270 may include a light emitting module for generating a visual event, a speaker module for generating an audio event, a haptic interface module for transmitting a feeling to a user, and the like. The warning unit 270 may warn the user of the presence of a simple crack or a high-risk crack according to the threshold value.

In addition, the portable crack inspection apparatus according to the present invention, the input unit 240 for receiving a user's input signal, the storage unit 280 for storing a variety of data, the power supply unit 290 for supplying power to operate the crack inspection apparatus ) May be further included.

The controller 250 controls overall operations of the component modules constituting the crack inspection apparatus. In FIG. 2, the controller 250 is shown as an independent module, but according to an embodiment, the controller 250 may be implemented to be distributed to each of the configuration modules to perform a corresponding function.

In one embodiment, the image processor 230 and the controller 250 may be implemented in the form of a microprocessor to allow the microprocessor to perform a corresponding function. Implementing the image processor 230 and the controller 250 as a microprocessor may reduce the size of the crack inspection apparatus, simplify the assembly process, and reduce manufacturing costs.

6A to 6F illustrate an embodiment of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

6A to 6F, the portable crack inspection device according to the present invention includes a housing in which the transmitter 210, the receiver 220, the image processor 230, and the display 260 are installed. ) May be included.

6A to 6D show a front view, a back view, a left side view and a right side view, respectively.

6A to 6D, the transmitter 210 and the receiver 220 emit the millimeter wave signal through the millimeter wave window 614 of the housing 600 at the rear side of the housing 600. And receive the reflected wave. The display unit 260 is installed to display the millimeter wave image on the front side of the housing 600. In addition, the housing 600 includes a gripping portion 610 for allowing a user to grip the front side.

In one embodiment, the housing 600 is a flip that can be opened and closed from the main body 610 and the main body portion 610 and the one end of the main body portion 610 and the main body portion 610 that forms the grip portion. It may include a cover 620. In addition, a flip opening groove 612 may be formed in the main body 610 so that a user may easily open the flip cover 620.

6A to 6F, the entire body portion 610 of the housing 600 is implemented in the form of a mouse to perform the function of the gripping portion 610, but according to the size or use environment of the crack inspection apparatus, the body portion The gripping portion may be implemented in the form of a handle extending from the 610 to allow a user to grip.

The display unit 260 may be installed at the front of the housing 600 as described above, may be installed on the inner surface of the flip cover 620. When the housing 600 is implemented in a flip shape, there is an advantage in that the size of the main body 610 that performs the grip portion function can be further miniaturized.

In one embodiment, the housing 600 is installed on the back side of the housing 600 to reduce the friction between the inspection object and the crack inspection device when performing the crack inspection, the surface of the inspection object In the may include a moving ball (moving ball: 630) to facilitate the movement of the crack inspection device.

In addition, the portable crack inspection apparatus according to the present invention may include a power supply unit 290 installed inside the housing 600 to supply power to operate the crack inspection device. The power supply unit 290 may be implemented as a built-in battery that can be charged by receiving power from the outside.

In addition, the portable crack inspection apparatus according to the present invention is installed on one side of the housing 600, an input unit for receiving a user signal to start the crack inspection for the inspection area 200, for example, the scan start button 242 ) May be included.

In addition, the portable crack inspection apparatus according to the present invention, the storage unit 280 is installed in the housing 600 and stores the image signal, and is installed on one side of the housing 600 to the image signal It may include an input unit for receiving a user signal to be stored in the storage unit 280, for example, a recording button 244. The recording button 244 and the storage unit 280 not only store the image signal, but also cannot display the millimeter wave image directly in the actual crack inspection environment. If 260 is not visible, the scan start button 242 is first pressed to scan the inspection area, and the recording button 244 is pressed to store the image signal, and then the crack inspection result image is checked later. It provides the benefits of doing so.

6E and 6F illustrate front and left side views of the flip cover 620 in an open state, respectively.

6E and 6F, the housing 600 may include an inspection region display unit 640 which is formed at a front side to display a user's recognition of the inspection region 200. The inspection area display unit 640 allows a user who can see only the front of the crack inspection device when performing the crack inspection to intuitively recognize the scan area, that is, the inspection area 200, which is being performed on the rear side.

7 shows an example of the use of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

As illustrated in FIG. 7, the user may hold the portable crack inspection apparatus according to the present invention with one hand to perform a crack inspection on an object to be inspected. In particular, the input unit 240 for receiving a user signal, such as the scan start button 242 and the recording button 244, may be installed on the housing 600 so as to be conveniently operated by the user during the crack inspection.

As described above, the present invention provides an advantage of ensuring the reliability and safety of crack inspection regardless of the type of the object to be inspected by using the active millimeter wave signal as the inspection signal. It also provides the advantage of improving the ease of crack inspection by colorizing the cracks appearing in millimeter images and warning of crack occurrences. Furthermore, by efficiently disposing each component module, it is possible to reduce the size and portability of the crack inspection apparatus and improve user convenience.

So far, the present invention has been described with reference to the embodiments. However, one of ordinary skill in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential technical spirit of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. That is, the true technical scope of the present invention is shown in the appended claims, and all differences within the equivalent scope will be construed as being included in the present invention.

1 is a diagram illustrating an effective emissivity of general objects according to various frequencies.

2 is a block diagram showing an example of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

3A to 3C are diagrams illustrating a scan operation of a receiver for an inspection area.

4 is a flowchart illustrating an example of an image processing method performed by an image processing unit.

5A and 5B are diagrams showing millimeter wave images generated according to the present invention.

6a to 6f are views showing an embodiment of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

7 is a view showing an example of the use of a portable crack inspection apparatus using an active millimeter wave according to the present invention.

Claims (13)

A transmitter for radiating a millimeter wave signal to an object to be inspected; A receiver configured to receive a reflected wave signal of the millimeter wave signal from an inspection region of the inspection object; A driving unit which changes the receiving direction of the receiving unit so that the receiving unit receives the reflected wave from the inspection area; An image processor configured to process the received reflected wave signal to generate an image signal representing a crack portion of the inspection area as a color image so as to be distinguished from a non-cracked portion; And A display unit for displaying a millimeter wave image for the inspection area by the image signal, The inspection area is divided and scanned into a matrix formed of unit cells, and the size of the unit cell indicates the size of the unit area that can receive the reflected wave signal for a predetermined time while the receiver is fixed at a specific position. The driving unit may be implemented as a device for rotating the receiver up, down, left, and right, thereby changing at least one or more of a rotation direction or a rotation angle of the receiver according to a preset rotation rule for a scan operation of the inspection area. Portable crack inspection device using an active millimeter wave. The method of claim 1, The image processor may be configured to calculate a voltage value of the received reflected wave signal, and when the calculated voltage value corresponds to a predetermined voltage value range representing a voltage value of the reflected wave caused by the cracked portion, the image processor may be configured to display the voltage value in the millimeter wave image. Generating the image signal representing a pixel of the crack portion corresponding to the calculated voltage value in a color distinct from the remaining pixels, The range of the predetermined voltage value is determined by measuring the average voltage of the reflected wave received in the inspection region of the object to be inspected, characterized in that the portable crack inspection device using an active millimeter wave. The method of claim 2, The image processor generates the image signal by changing one or more of the color, brightness, and saturation of the pixel of the crack according to the magnitude of the calculated voltage value corresponding to the predetermined voltage value range. Portable crack inspection device using an active millimeter wave. The method of claim 2, The crack inspection apparatus further comprises a warning unit for generating a warning signal when the number of pixels of the crack portion occupies a predetermined threshold value or more in the millimeter wave image. delete delete A transmitter for radiating a millimeter wave signal to an object to be inspected; A receiver configured to receive a reflected wave signal of the millimeter wave signal from an inspection region of the inspection object; A driving unit which changes the receiving direction of the receiving unit so that the receiving unit receives the reflected wave from the inspection area; An image processor which processes the received reflected wave signal to generate an image signal; A display unit configured to display a millimeter wave image of the inspection area by the image signal; And And a housing in which the transmitter, the receiver, the image processor, and the display are installed. The transmitter and the receiver are provided to radiate the millimeter wave signal and receive the reflected wave at the rear side of the housing, the display unit is installed to display the millimeter wave image at the front side of the housing, and A gripping portion is installed on the front side to allow the user to grip, The housing includes a main body portion forming the gripping portion and a flip cover connected to one end of the main body portion by a hinge to open and close from the main body portion. The display unit is installed on the inner surface of the flip cover, The driving unit may be implemented as a device for rotating the receiver up, down, left, and right, thereby changing at least one or more of a rotation direction or a rotation angle of the receiver according to a preset rotation rule for a scan operation of the inspection area. Portable crack inspection device using an active millimeter wave. delete The method of claim 7, wherein The housing is a portable crack inspection apparatus using an active millimeter wave, characterized in that it further comprises an inspection area display unit formed on the front side to display a user to recognize the inspection area. The method of claim 7, wherein The housing is a portable crack inspection device using an active millimeter wave, characterized in that it further comprises a moving ball which is provided on the rear side to facilitate the movement of the crack inspection device on the surface of the inspection object. The method of claim 7, wherein The crack inspection apparatus is a portable crack inspection apparatus using an active millimeter wave, characterized in that it further comprises an input unit which is provided on one side of the housing to receive a user signal to initiate a crack inspection for the inspection area. The method of claim 7, wherein The crack inspection device, A storage unit which stores the video signal; And And an input unit installed at one side of the housing to receive a user signal for storing the image signal in the storage unit. The method of claim 7, wherein The crack inspection apparatus is a portable crack inspection apparatus using an active millimeter wave, characterized in that it further comprises a power supply which is installed inside the housing for supplying power to operate the crack inspection apparatus.

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