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11.发明授权公开(公告)号：US11494891B2
公开(公告)日：2022-11-08
申请号：US17128680
申请日：2020-12-21
Inventor： Hoon Sohn , Soonkyu Hwang , Hyeonjin Kim , Hyung Jin Lim
IPC: G06K9/00 , G06T7/00 , G06T7/62 , G06T7/11 , G06T7/70 , G06K9/62 , G06T5/00 , G06T5/20 , G06T11/00 , H04N5/30 , G06V10/25
Abstract: Disclosed are a method of inspecting and evaluating a coating state of a steel structure, and a system therefor. A plurality of vision images and thermal images are acquired. While acquiring the thermal images, a desired region is heated. After the thermal images and the vision images in a dynamic state are reconstructed into a time-spatial-integrated thermal image and a time-spatial-integrated vision image in a static state, respectively, an overlay image is generated by overlaying the two images. A deterioration region of a coating is detected, and coating deterioration is classified by characteristics. A size of the coating deterioration region is quantified. A thickness of the coating is inspected by analyzing thermal energy measured from the time-spatial-integrated thermal image. A coating grade is calculated by comprehensively evaluating a coating deterioration inspection result and a coating thickness inspection result. A state evaluation report for the steel structure is automatically created.
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公开(公告)号：US11131651B2
公开(公告)日：2021-09-28
申请号：US16427389
申请日：2019-05-31
Inventor： Hoon Sohn , Peipei Liu , Jinho Jang
Abstract: In a method of inspecting a structure, a first ultrasonic signal generated from a target structure by a first laser beam is received. The first ultrasonic signal is generated by providing the first laser beam generated from a first excitation unit to the target structure. A second ultrasonic signal generated from the target structure by a second laser beam different from the first laser beam is received. The second ultrasonic signal is generated by providing the second laser beam generated from a second excitation unit to the target structure. A third ultrasonic signal generated from the target structure by the first and second laser beams is received. The third ultrasonic signal is generated by simultaneously providing the first and second laser beams to the target structure. It is determined whether the target structure is damaged based on first, second and third ultrasonic frequency spectra that are obtained by converting the first, second and third ultrasonic signals, respectively.
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公开(公告)号：US10508970B2
公开(公告)日：2019-12-17
申请号：US16475701
申请日：2018-01-29
Inventor： Nam-Yeol Kwon , Doo-Young Kang , Seung-Beom Park , Min-Jae Kim , Jae-Min Moon , Hyeon-Muk Lim , Jin-Seok Kang , Hoon Sohn , Ki-Young Kim , Gun-Hee Koo , Jae-Muk Choi , Jun-Yeon Chung
IPC: G01M5/00
Abstract: Disclosed are a system and a method for precisely measuring a structure are disclosed. A reference meter installed at a fixed location provides GPS reference information. A plurality of response meters, respectively installed at a plurality of positions of the structure, acquire acceleration information through acceleration sensors and measure a plurality of real-time kinematic (RTK) displacement data based on the GPS reference information, respectively. The response meters synchronize acceleration information with the plurality of RTK displacement data measured to generate into a packet to be transmitted. An operation processor receives the acceleration information and the plurality of RTK displacement data and calculates structure response information. With the GPS and accelerometers, the dynamic behaviors of structures including high-rise buildings, bridges, dams, and harbors can be precisely measured.
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Patent Agency Ranking
公开(公告)号：US10222354B2
公开(公告)日：2019-03-05
申请号：US14955910
申请日：2015-12-01
Inventor： Jae Roung Park , Cheol Woo Lim , Byeong-Jin Park , Byeongju Song , Hoon Sohn
Abstract: A non-contact durability diagnosis apparatus includes: (a) applying non-contactly and sequentially at least two excitation ultrasonic waves to an object and storing frequency signals generated from the object; (b) applying non-contactly and simultaneously the at least two excitation ultrasonic waves to the object and storing frequency signals generated from the object; (c) storing derived frequency signals remaining after removing an overlapping portion of the frequency signals of step (a) and the frequency signals of step (b); and (d) determining that the object is damaged when at least one of the generated frequency signals of step (c) is larger than a predetermined value.
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15.发明授权公开(公告)号：US12209935B2
公开(公告)日：2025-01-28
申请号：US17908410
申请日：2021-06-03
Inventor： Hoon Sohn , Zhanxiong Ma
IPC: G01M5/00
Abstract: In a method of estimating displacement of a bridge, a first displacement including a low frequency component and a first high frequency component is generated based on a strain that is measured by a plurality of pairs of strain gauges installed at positions in a first direction from a reference point, in a bridge, a second displacement including a second high frequency component is generated based on an acceleration that is measured by an accelerometer installed at a first position spaced apart from the reference point by a first distance in the first direction, in the bridge, and a final displacement of the bridge is generated based on an unknown parameter associated with the displacement, the low frequency component and the second high frequency component. The unknown parameter is generated by applying a recursive least square algorithm to the first high frequency component and the second high frequency component.
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16.发明公开公开(公告)号：US20240175779A1
公开(公告)日：2024-05-30
申请号：US18508651
申请日：2023-11-14
Inventor： Hoon Sohn , Ohjun Kwon
IPC: G01M7/02
CPC classification number: G01M7/025
Abstract: Disclosed are method and system of estimating an absolute strain of a structure under tensile force in a reference-free manner using ultrasonic wave velocity. Ultrasonic vibrations are generated by a vibration exciting element attached to the structure, and first and second ultrasonic vibrations propagating in a tensile force direction and a direction orthogonal to the tensile force direction in the structure are detected using first and second vibration detection elements, respectively. The detected first and second ultrasonic vibration signals are converted into first and second digital signals. Then, a computing unit calculates propagation velocities of the first and second ultrasonic vibrations, and applies them to an equation of relationship between propagation velocities of ultrasonic vibrations and a strain of the structure to obtain an absolute strain of the structure in the x-direction due to the tensile force. The calculated absolute strain can be used to evaluate stability of the structure.
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17.发明授权公开(公告)号：US11590579B2
公开(公告)日：2023-02-28
申请号：US17118890
申请日：2020-12-11
Inventor： Hoon Sohn , Ikgeun Jeon
Abstract: Disclosed are a method and apparatus of estimating a depth of a molten pool formed during a 3D printing process, and a 3D printing system. A surface temperature of the molten pool is measure by taking a thermal image of a laminated printing object during the 3D printing process with a thermal imaging camera. The measured surface temperature is compared with a melting point of the base material to determine a surface boundary of the molten pool. The maximum lengths in x-axis and y-axis directions of a surface region of the molten pool defined by the surface boundary of the molten pool are determined as a length and a width of the surface of the molten pool, respectively. A maximum depth in the z-axis direction of the molten pool is determined in real time based on the length and width of the surface region of the molten pool.
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18.发明授权公开(公告)号：US11371839B2
公开(公告)日：2022-06-28
申请号：US16307640
申请日：2018-11-02
Inventor： Hoon Sohn , Soonkyu Hwang , Jiho Park
Abstract: A method of performing visualized measurement on thickness distribution of a paint film and an apparatus therefor. A measurement target region is heated by a heating unit that applies a light beam while moving relative to the measurement target region of a measurement target structure. A sensing unit moving together with the heating unit generates a plurality of thermal images related to a phenomenon in which thermal energy is propagated in the measurement target region by scanning and photographing the heated measurement target region. The thermal images in a dynamic state are converted into time-spatial-integrated thermal images in a static state by performing coordinate transformation according to a time-spatial-integrated coordinate transformation algorithm. A thickness of the paint film is calculated by using a Fourier thermal conduction equation. A noise caused by an external heat source is removed by subtracting a pre-heating time-spatial-integrated thermal image from the converted time-spatial-integrated thermal image.
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