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Il-Bum Kwon   Dr.  Senior Scientist or Principal Investigator 
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Il-Bum Kwon published an article in October 2018.
Top co-authors
Y. Chung

143 shared publications

School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, South Korea

Min Yong Jeon

97 shared publications

Dept. of Physics, Chungnam National University, 99 Daehak-ro Yuseong-gu, Daejeon, 34134, South Korea

Dae-Cheol Seo

26 shared publications

Center for Safety Measurement, Korea Research Institute of Standards and Science (KRISS), Yuseong-gu, Daejeon 34114, Korea

Ki-Sun Choi

6 shared publications

Korea Research Institute of Standards and Science (Korea, Republic of)

Tae-Sik Cho

3 shared publications

Korea Research Institute of Standards and Science (Korea, Republic of)

51
Publications
21
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49
Citations
Publication Record
Distribution of Articles published per year 
(2002 - 2018)
Total number of journals
published in
 
35
 
Publications See all
Article 1 Read 0 Citations Strain Measurement Distributed on a Ground Anchor Bearing Plate by Fiber Optic OFDR Sensor Yong-Seok Kwon, Dae-Cheol Seo, Bo-Hun Choi, Min Yong Jeon, I... Published: 25 October 2018
Applied Sciences, doi: 10.3390/app8112051
DOI See at publisher website ABS Show/hide abstract
The safety of soil slopes reinforced by ground anchors can be evaluated by monitoring the tensile force of the anchors. The tensile force of ground anchors can be determined by measuring the strain of the bearing plate that transfers the tensile force of the anchor to the ground. Therefore, in order to investigate the relation between the strain of the bearing plate and the tensile force of a ground anchor, the strain distributed on the bearing plate was measured by a fiber optic OFDR (optical frequency domain reflectometry) sensor, which was fabricated by a tunable laser source, auxiliary interferometer, and main interferometer. This OFDR sensor was operated through a sweep range of 500 GHz with a spatial resolution of 0.2 mm, and a strain accuracy of approximately 4 με, considering the system noise when operating in 5-cm segments. The sensing fiber was circularly bonded onto the bearing plate using epoxy, and the distributed strain was measured on the bearing plate while increasing the load up to 10 tons. From the experimental results, the difference between the strain near the anchor head and the strain at the far site is significant in the region where compression strain is dominant. However, such a tendency did not appear in areas where bending strain dominates. Therefore, in order to monitor an anchor tensile force, it is necessary to carefully study the calibration factor between the anchor tensile force and the strain of the bearing plate.
PREPRINT 0 Reads 0 Citations Enhancement of Distributed Temperature Sensitivity Using Al-Coated Fiber in OFDR Yong-Seok Kwon, Khurram Naeem, Min Yong Jeon, Il-Bum Kwon Published: 31 May 2018
PHYSICAL SCIENCES, doi: 10.20944/preprints201805.0477.v1
DOI See at publisher website ABS Show/hide abstract
We present a distributed optical-fiber temperature sensor with enhanced sensitivity based on an Al-coated fiber using the Rayleigh backscattering spectra (RBS) shift in optical frequency-domain reflectometry (OFDR). The Al-coated sensing fiber with a higher thermal expansion coefficient compared to silica produces a strain-coupled shift in the RBS under an increase in temperature. This effect leads to an enhanced temperature sensitivity of the distributed measurement scheme. Our results revealed that the temperature sensitivity obtained using the Al-coated fiber in OFDR was ~56% higher relative to that of a single-mode fiber. Moreover, the minimum measurable temperature recorded was 1 °C with a spatial resolution of 5 cm.
Article 2 Reads 0 Citations Bend-Loss-Free Distributed Sensor Based on Rayleigh Backscattering in Ge-Doped-Core PCF Khurram Naeem, Yong-Seok Kwon, Youngjoo Chung, Il-Bum Kwon Published: 01 March 2018
IEEE Sensors Journal, doi: 10.1109/jsen.2017.2788017
DOI See at publisher website
Article 2 Reads 1 Citation Highly Sensitive Two-Dimensional Bending Vector Sensor Using an Elliptic Two-Core PCF Khurram Naeem, Youngjoo Chung, Il-Bum Kwon Published: 01 February 2018
IEEE Photonics Technology Letters, doi: 10.1109/lpt.2017.2782820
DOI See at publisher website
Article 3 Reads 4 Citations Strain pattern detection of composite cylinders using optical fibers after low velocity impacts Bo-Hun Choi, Il-Bum Kwon Published: 01 January 2018
Composites Science and Technology, doi: 10.1016/j.compscitech.2017.11.019
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Fiber optic BOCDA sensor using phase code modulation of pump and probe lights Il-Bum Kwon, Bo-Hun Choi, Dae-Cheol Seo Published: 01 January 2018
26th International Conference on Optical Fiber Sensors, doi: 10.1364/ofs.2018.wf25
DOI See at publisher website
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