公开(公告)号：US20160109416A1

公开(公告)日：2016-04-21

申请号：US14787127

申请日：2013-12-23

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hoon SOHN ,  Hyung Jin LIM ,  Su Young YANG ,  Peipei LIU

IPC: G01N29/46 ,  G01N29/24 ,  G01B17/04

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.

Abstract translation: 本发明涉及一种使用非线性超声波调制技术的结构的安全诊断方法。 安全诊断方法包括：通过施加不同超声波频率的信号使结构振动; 将由振动产生的结构的响应转换为数字信号; 通过从数字信号中减去不同超声波频率的信号的谐波响应和线性响应来提取第一调制信号，并同步解调数字信号; 通过组合通过在不同超声波频率的信号之间连续改变至少频率而产生的第一调制信号来构造第一边带频谱图; 并根据第一边带谱图判断结构是否破裂。 即使与现有技术相比，施加到结构的超声波的功率非常小，是否精确地确定了损伤，因此可以降低功耗。

公开(公告)号：US20240328998A1

公开(公告)日：2024-10-03

申请号：US18580750

申请日：2022-07-19

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon SOHN ,  Hyung Jin LIM ,  Jongsu LEE

IPC: G01N27/72 ,  G01B11/14 ,  G01N33/204

CPC classification number: G01N27/72 ,  G01N33/204 ,  G01B11/14

Abstract: 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.

公开(公告)号：US20210201472A1

公开(公告)日：2021-07-01

申请号：US17128680

申请日：2020-12-21

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Hoon SOHN ,  Soonkyu HWANG ,  Hyeonjin KIM ,  Hyung Jin LIM

IPC: G06T7/00 ,  G06T7/70 ,  G06K9/62 ,  G06T7/62 ,  H04N5/30 ,  G06T11/00 ,  G06K9/32 ,  G06T7/11 ,  G06T5/20 ,  G06T5/00

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.