公开(公告)号：US11796406B2

公开(公告)日：2023-10-24

申请号：US16961160

申请日：2019-01-10

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Il-Bum Kwon ,  Dae-Cheol Seo ,  Chi Yup Kim

IPC: G01L1/24 ,  G01D5/353 ,  G01M5/00

CPC classification number: G01L1/242 ,  G01D5/35351 ,  G01M5/0033

Abstract: An apparatus and method for detecting composite material damage due to impact by using distributed optical fiber are disclosed. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, the position and level of damage occurring in a composite material due to low-velocity impact can be effectively and economically detected by measuring the residual strain of optical fiber distributed on the surface of the composite material or inside the composite material. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, there is no need to always operate a sensor in real time, so that detection errors due to temporary failures, malfunctions, etc. of the sensor, as well as a problem of constantly supplying power to the sensor, can be essentially removed.

公开(公告)号：US11662229B2

公开(公告)日：2023-05-30

申请号：US17055037

申请日：2019-05-16

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Il-Bum Kwon ,  Dae-Cheol Seo ,  Chi-Yeop Kim ,  Bo-Hun Choi

IPC: G01D5/353 ,  G01K11/322 ,  G01L1/24

CPC classification number: G01D5/35364 ,  G01K11/322 ,  G01L1/242

Abstract: The present invention relates to an optical fiber BOCDA sensor. A purpose of the present invention is to provide an optical fiber BOCDA sensor which uses two phase codes to control a correlation peak position, thereby further simplifying control design and device configuration and improving spatial resolution to enhance a sensing performance and detection accuracy in comparison with the prior art.

公开(公告)号：US09791335B2

公开(公告)日：2017-10-17

申请号：US15025334

申请日：2014-09-30

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Il-Bum Kwon ,  Joo Eun Im ,  Mi Hyun Kim ,  Ki Sun Choi

IPC: G01B11/16 ,  G01L1/24 ,  G01B1/00 ,  G01D5/353

CPC classification number: G01L1/246 ,  G01B1/00 ,  G01B11/16 ,  G01B11/165 ,  G01B11/18 ,  G01D5/353 ,  G01D5/35316 ,  G01D5/3537

Abstract: The present invention relates to an FBG sensor for measuring a maximum strain of an object being measured, a method for manufacturing the sensor, and a method of using the sensor. To this end, provided is the FBG sensor for measuring a maximum strain, comprising: an optical fiber (130) having an FBG sensor (150) therein; a first metallic foil (120) contacting the optical fiber (130) on one surface thereof; a second metallic foil (120) which comes into surface-contact with the one surface; an adhesive layer (140) provided between the first and second metallic foils (100, 120); a means for measuring a residual strain of the first and second metallic foils (100, 120) through the FBG sensor (150); and a means for calculating a maximum strain on the basis of the measured residual strain and a sensitivity coefficient (Csen) obtained through experimentation.