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公开(公告)号：US20210197282A1
公开(公告)日：2021-07-01
申请号：US17123535
申请日：2020-12-16
发明人： Hoon SOHN , Ikgeun JEON
摘要： A method and apparatus for estimating a height of a 3D printing object formed during a 3D printing process are disclosed. The method includes extracting one or more temperature-related data of the 3D printing object formed during the 3D printing process, building an artificial neural network model for estimating the height of the 3D printing object by using the extracted temperature-related data; and estimating the height of the 3D printing object by inputting a newly measured thermal image and the one or more temperature-related data values into the artificial neural network model. The height of the 3D printing object can be measured in real time.
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公开(公告)号：US20210197275A1
公开(公告)日：2021-07-01
申请号：US17118862
申请日：2020-12-11
发明人： Hoon SOHN , Ikgeun JEON
IPC分类号： B22F10/25 , B22F10/85 , B22F12/90 , B22F12/41 , G06T7/50 , G06T7/62 , G06T7/00 , B23K26/70 , B23K26/067 , B23K26/06 , B22F10/368
摘要： Disclosed are a method of controlling a size of a molten pool formed during a 3D printing process in real time and a system for the same. A thermal image of the molten pool is taken by a thermal imaging camera. A temperature interface exceeding a melting point of a base metal is specified in the thermal image. A size of the molten pool is obtained by estimating a length, a width, and a depth of the molten pool using the temperature interface. A predicted size of the molten pool is obtained using an artificial neural network model. An actually measured size of the molten pool is derived from a surface temperature of the molten pool. An error between the predicted size and the measured size of the molten pool is calculated to be used for controlling the size of the molten pool in real time.
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公开(公告)号：US20240328998A1
公开(公告)日：2024-10-03
申请号：US18580750
申请日：2022-07-19
发明人： Hoon SOHN , Hyung Jin LIM , Jongsu LEE
IPC分类号： G01N27/72 , G01B11/14 , G01N33/204
CPC分类号： G01N27/72 , G01N33/204 , G01B11/14
摘要： For non-destructively measuring the yield strength of a metallic member using magnetic incremental permeability, a quasi-static excitation magnetic field is applied to two points of the metallic member, while a small alternating magnetic field generated by a transmitting coil is applied to the metal member. Intensity of the quasi-static excitation magnetic field applied to the metallic member is measured using a Hall sensor. The magnetic field induced by the magnetized metallic member is detected using a sensing coil. Using signals from the Hall sensor and the sensing coil, a reversible permeability (MIP) of the metallic member is obtained. A grain size of the metallic member is obtained from the relationship between the reversible permeability and the grain size of the metallic member, and the yield strength of the metallic member is calculated using the grain size. The grain size and yield strength of the metallic member can be measured non-destructively.
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公开(公告)号：US20210199567A1
公开(公告)日：2021-07-01
申请号：US17114647
申请日：2020-12-08
发明人： Hoon SOHN , Peipei LIU
摘要： 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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公开(公告)号：US20210197279A1
公开(公告)日：2021-07-01
申请号：US17128658
申请日：2020-12-21
发明人： Hoon SOHN , Peipei LIU
IPC分类号： B22F10/36 , B22F10/25 , B22F12/43 , B33Y10/00 , B33Y30/00 , B33Y50/02 , G01N29/24 , G01N29/44 , G01N29/04 , G01B17/02 , G01N29/07
摘要： 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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公开(公告)号：US20230384268A1
公开(公告)日：2023-11-30
申请号：US18250261
申请日：2021-12-31
发明人： Hoon SOHN , Jin Ho JANG
摘要： A method for detecting fatigue cracks in a structure and a system therefore are disclosed. A vibration detection element detects vibration of the structure generated when the structure is excited at low and high frequencies and generates a measurement signal in the time domain. Based on a trained long short-term memory (LSTM) network, a signal of the next time step is predicted from the measurement signal of the current time step measured by the vibration detection element. The measurement signal and the prediction signal are combined to create a new combined signal with an increased length in the time domain. The combined signal is Fourier transformed to reduce noise and enhance the information of the measured signal in the frequency domain, and the Fourier transformed signal is used to obtain a spectral density function and to detect cracks in the structure.
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7.发明申请公开(公告)号：US20230051394A1
公开(公告)日：2023-02-16
申请号：US17934004
申请日：2022-09-21
发明人： Hoon SOHN , Ikgeun JEON , Peipei LIU
摘要： 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：US20210201472A1
公开(公告)日：2021-07-01
申请号：US17128680
申请日：2020-12-21
发明人： Hoon SOHN , Soonkyu HWANG , Hyeonjin KIM , Hyung Jin LIM
IPC分类号： G06T7/00 , G06T7/70 , G06K9/62 , G06T7/62 , H04N5/30 , G06T11/00 , G06K9/32 , G06T7/11 , G06T5/20 , G06T5/00
摘要： 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：US20240202898A1
公开(公告)日：2024-06-20
申请号：US18554919
申请日：2022-03-11
发明人： Hoon SOHN , Jae Mook CHOI , Zhanxiong MA , Ki Young KIM
CPC分类号： G06T7/0002 , G01P15/00 , G06T5/20 , G06T5/70 , G06T7/248 , G06T7/277 , G06T2207/20004 , G06T2207/30184
摘要： Disclosed are a method and a system for measuring a displacement of a structure based on fusion of asynchronous vision measurement data of natural target and acceleration data of the structure. A scale factor, which is a conversion factor between a pixel resolution of the image frame data and a distance resolution of real space, is calculated using image frame data taken at a predetermined first sample frequency of a stationary target outside the structure by a camera installed on the structure, and acceleration data measured at a predetermined second sample frequency by an accelerometer installed on the structure, over time. A vision-based displacement value of the structure is estimated using a feature point matching algorithm and the scale factor.
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公开(公告)号：US20200074901A1
公开(公告)日：2020-03-05
申请号：US16512990
申请日：2019-07-16
发明人： Hoon SOHN , Sangwoo CHOI , Minsang KOO , Sanghyuk KWON , Eunchul SHIN , Woojin JUNG , Jiho PARK , Soonkyu HWANG
IPC分类号： G09G3/00 , G01N21/956 , G01N21/17 , G01N25/72
摘要： 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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