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公开(公告)号：US20200011839A1
公开(公告)日：2020-01-09
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：US12046167B2
公开(公告)日：2024-07-23
申请号：US16512990
申请日：2019-07-16
Inventor： Hoon Sohn , Sangwoo Choi , Minsang Koo , Sanghyuk Kwon , Eunchul Shin , Woojin Jung , Jiho Park , Soonkyu Hwang
IPC: G01N25/72 , G01N21/17 , G01N21/95 , G01N21/956 , G09G3/00
CPC classification number: G09G3/006 , G01N21/171 , G01N21/95607 , G01N25/72 , G01N2021/95615
Abstract: An apparatus for inspecting a display panel for defects includes a table which supports the display panel, a laser excitation unit that irradiates a non-display area of the display panel with a point laser beam, a thermal wave detecting unit that generates thermal wave images of irradiated portions of the non-display area, a driving unit, and a control unit. A groove corresponding to an edge of the display panel may be defined in a top surface of the table. A defect, such as a crack, may be detected by comparing a defect pattern obtained from the thermal wave images with a pre-registered defect pattern.
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公开(公告)号：US11815447B2
公开(公告)日：2023-11-14
申请号：US17114647
申请日：2020-12-08
Inventor： Hoon Sohn , Peipei Liu
CPC classification number: G01N21/1702 , B22F12/90 , B33Y30/00 , B33Y50/02 , G01N21/8806 , B22F10/25 , G01N2201/067 , G01N2201/06113
Abstract: Disclosed are a femtosecond laser-based ultrasonic measuring apparatus for a 3D printing process, and a 3D printing system including the apparatus. The apparatus includes a femtosecond laser source for generating a femtosecond laser beam irradiated to inspect a state of a printing object formed by melting a base material by a printing laser beam irradiated from the laser source for 3D printing, a beam splitter for separating the femtosecond laser beam generated by the femtosecond laser source into a pump laser beam and a probe laser beam, an electric/acoustic optical modulator for modulating the pump laser beam, a time delay unit for delaying the probe laser beam, a photo detector for detecting the probe laser beam reflected by the printing object, and a lock-in amplifier for detect an amplitude and a phase of the output signal from the photo detector. The femtosecond laser source is disposed coaxially with a laser source for 3D printing.
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4.发明授权公开(公告)号：US11484945B2
公开(公告)日：2022-11-01
申请号：US17124973
申请日：2020-12-17
Inventor： Hoon Sohn , Ikgeun Jeon , Peipei Liu
IPC: B22F10/85 , B22F10/25 , B22F10/36 , B22F12/41 , B22F12/90 , B33Y50/02 , G06T7/00 , G06T7/50 , B33Y10/00 , B33Y30/00
Abstract: A method of feedback controlling a 3D printing process in real time, and a system therefor are disclosed. The method includes collecting big data, generated through 3D printing experiments, related to process variables of 3D printing, measurement signals, and 3D printing quality of the 3D printing object; building an artificial neural network model by performing machine-learning based on the collected big data; evaluating whether or not a 3D printing quality of the 3D printing object is abnormal in real time based on an actual measurement signal of the 3D printing object and the artificial neural network model; and feedback controlling printing quality of the 3D printing object in real time based on the evaluation result of whether or not the 3D printing quality of the 3D printing object is abnormal.
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公开(公告)号：US20210223037A1
公开(公告)日：2021-07-22
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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Patent Agency Ranking
公开(公告)号：US11858040B2
公开(公告)日：2024-01-02
申请号：US17128658
申请日：2020-12-21
Inventor： Hoon Sohn , Peipei Liu
IPC: B22F10/36 , B33Y10/00 , B33Y30/00 , B33Y50/02 , B22F12/43 , B22F10/25 , G01B17/02 , G01N29/04 , G01N29/24 , G01N29/44 , G01N21/17 , G01N29/07
CPC classification number: B22F10/36 , B22F10/25 , B22F12/43 , B33Y10/00 , B33Y30/00 , B33Y50/02 , G01B17/02 , G01N21/1702 , G01N29/043 , G01N29/07 , G01N29/2418 , G01N29/44 , G01N2021/1706 , G01N2291/011 , G01N2291/0231 , G01N2291/0289 , G01N2291/02827 , G01N2291/02854
Abstract: Disclosed are a method of inspecting a printing quality of a 3D printing object using a femtosecond laser beam during a 3D printing process, and an apparatus and a 3D printing system for the same. A laser beam is irradiated from a femtosecond laser source disposed coaxially with a 3D printing laser source to inspect a state of the printing object. The laser beam generated by the femtosecond laser source is separated into a pump laser beam and a probe laser beam. The printing laser beam irradiated from a 3D printing laser source or the pump laser beam is irradiated onto a printing object to generate ultrasonic waves. To measure the ultrasonic waves, a probe laser beam is irradiated onto the printing object. The probe laser beam reflected by the printing object is detected. The quality of the printing object is inspected by analyzing the reflected probe laser beam.
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7.发明授权公开(公告)号：US11628502B2
公开(公告)日：2023-04-18
申请号：US17934004
申请日：2022-09-21
Inventor： Hoon Sohn , Ikgeun Jeon , Peipei Liu
IPC: B22F10/85 , B22F10/25 , B22F10/36 , B22F12/41 , B22F12/90 , B33Y50/02 , G06T7/50 , G06T7/00 , B33Y10/00 , B33Y30/00
Abstract: A method of feedback controlling a 3D printing process in real time, and a system therefor are disclosed. The method includes collecting big data, generated through 3D printing experiments, related to process variables of 3D printing, measurement signals, and 3D printing quality of the 3D printing object; building an artificial neural network model by performing machine-learning based on the collected big data; evaluating whether or not a 3D printing quality of the 3D printing object is abnormal in real time based on an actual measurement signal of the 3D printing object and the artificial neural network model; and feedback controlling printing quality of the 3D printing object in real time based on the evaluation result of whether or not the 3D printing quality of the 3D printing object is abnormal.
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公开(公告)号：US09772315B2
公开(公告)日：2017-09-26
申请号：US14787127
申请日：2013-12-23
Inventor： Hoon Sohn , Hyung Jin Lim , Su Young Yang , Peipei Liu
CPC classification number: G01N29/46 , G01B17/04 , G01M5/0033 , G01M5/0066 , G01N29/045 , G01N29/0654 , G01N29/2437 , G01N29/28 , G01N29/348 , G01N2291/01 , G01N2291/023 , G01N2291/02475 , G01N2291/02491 , G01N2291/0258 , G01N2291/0289 , G01N2291/106
Abstract: The present invention relates to a safety diagnosis method for a structure using a nonlinear ultrasonic wave modulation technique. The safety diagnosis method includes: making the structure vibrate by applying signals of different ultrasonic frequencies; converting the responses of the structure generated by the vibration into digital signals; extracting first modulation signals by subtracting the harmonic responses and the linear responses of the signals of different ultrasonic frequencies from the digital signals and synchronously demodulating the digital signals; constructing a first sideband spectrogram by combining the first modulation signals generated by continuously changing at least frequency among the signals of different ultrasonic frequencies; and deciding whether the structure is cracked based on the first sideband spectrogram. Even though the power of the ultrasonic wave applied to the structure is very small as compared with the related art, whether there is the damage is precisely decided, and thus power consumption may be reduced.
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公开(公告)号：US20170023530A1
公开(公告)日：2017-01-26
申请号：US14955910
申请日：2015-12-01
Inventor： Jae Roung Park , Cheol Woo Lim , Byeong-Jin Park , Byeongju Song , Hoon Sohn
CPC classification number: G01N29/12 , G01N29/4463 , G01N2291/0258 , G01N2291/2623 , G01N2291/2626
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.
Abstract translation: 非接触耐久性诊断装置包括：（a）向对象非接触地和顺序地施加至少两个激发超声波并存储从物体产生的频率信号; （b）将至少两个激发超声波非接触地同时施加到物体并存储从物体产生的频率信号; （c）在去除步骤（a）的频率信号和步骤（b）的频率信号的重叠部分之后存储导出的频率信号; 以及（d）当步骤（c）的所生成的频率信号中的至少一个大于预定值时，确定所述物体被损坏。
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10.发明申请公开(公告)号：US20150168352A1
公开(公告)日：2015-06-18
申请号：US14418427
申请日：2013-07-11
Inventor： Hoon Sohn , Byeong Jin Park
CPC classification number: G01N29/2418 , F03D17/00 , F05B2270/8042 , G01M5/0016 , G01M5/0033 , G01M5/0066 , G01M5/0091 , G01M7/00 , G01N29/04 , G01N29/043 , G01N29/069 , G01N29/4427 , G01N2291/023 , G01N2291/0258 , G01N2291/0289 , G01N2291/2634 , G01N2291/2693
Abstract: Provided is a structural health monitoring system of a rotating object such as a turbine blade, which gives easy and intuitive information to field managers on the damage location and the damage size of the rotating object by computing and visualizing correlations between damage and propagating ultrasonic wave. The structural health monitoring system for a rotating object comprises an ultrasonic generation system which generates an ultrasonic signal by irradiating a pulse laser beam to a point of the rotating object, a pulse laser control system which adjusts the irradiating time of the pulse laser beam, an ultrasonic measurement system which measures a generated ultrasonic signal at a point of the rotating object away from the point irradiated by the pulse laser beam and a damage detection system which provides information of damage existence, damage location and damage severity by visualization of monitored ultrasonic signals.
Abstract translation: 提供了诸如涡轮叶片的旋转物体的结构健康监测系统，通过计算和可视化损伤和传播的超声波之间的相关性，向现场经理在损伤位置和旋转物体的损伤大小上提供简单直观的信息。 用于旋转物体的结构健康监测系统包括：超声发生系统，其通过将脉冲激光束照射到旋转物体的点来产生超声波信号;脉冲激光控制系统，其调节脉冲激光束的照射时间; 超声波测量系统，其测量在旋转对象远离脉冲激光束照射的点处产生的超声波信号;以及损伤检测系统，其通过监视的超声信号的可视化提供损伤存在，损伤位置和损伤严重性的信息。
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