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백세종(Se Jong Baik),권일범(Il Bum Kwon),정철(Chul Chung),유재왕(Jae Wang Yu) 한국센서학회 2002 센서학회지 Vol.11 No.4
The developing of buried fiber optic sensor with high sensitivity and broad-area detecting intruders is carried out using fiber optic ROTDR(Rayleigh Optical Time Domain Reflectometry). The sensing part was designed to be able to broad-area detect intrusion effect per optical fiber length underground. The bending light losses in optical fibers are investigated by commercial mini ROTDR with wavelength 1.55㎛, distance range 5km, pulse width 20ns, SNR=5.7. The sensing fibers are selected as the common telecommunication fibers are the 1.5mm, 3.5 mm outer diameter, 4km each length fiber products. Experiments were investigate the characteristics of signal sensitivity according to applied intrusion weight. The relation between the applied weight and the bending loss was almost linear, and broad-area detect intrusion effects are the 2m resolution and 1.3㎡ per optical fiber length respectively. The light loss by the applied weight on fiber was 0.17 dB/kg, that the sensitivity of the optical fiber sensor was sufficient to detect intruders passing over the buried optical fiber.
Pd이 코팅된 단일모드 광섬유 센서를 이용한 수소 검출 시스템
김광택,박선옥,황보승,마재평,백세종,임기건,김태언,김회종,Kim, Kwang-Taek,Park, Son-Oc,HwangBo, Seung,Mah, Jae-Pyung,Baik, Se-Jong,Im, Kie-Gon,Kim, Tae-Un,Kim, Hwe-Jong 한국광학회 2007 한국광학회지 Vol.18 No.6
단일모드 광섬유를 이용한 수소센서의 특성을 이론 및 실험으로 분석하였다. 검출 소재로 팔라듐(Pd:palladium) 필름을 이용하였고 광섬유와 Pd 사이의 접착력을 강화하기 위해 니켈(Ni) 필름을 사용하였다. 제작된 센서의 반응감도와 반응시간은 팔라듐 박막의 두께에 크게 의존하였다. 단일모드 광섬유 끝단에 접착층으로 5 nm 두께의 Ni 박막과 감응막으로 10 nm 두께의 Pd가 코팅된 센서는 0.6 dB의 반사도의 변화와 $3{\sim}5$초의 반응시간을 보였다. The characteristics of the single mode fiber hydrogen sensor have been investigated theoretically and experimentally. Palladium is adopted as a material for the transducer and a thin Ni film is used for the adhesion between the fiber end and the Pd film. It is shown that sensitivity and response time strongly depend on the thickness of Pd film. The single mode fiber sensor coated with 5 nm thick Ni adhesion layer and 10 nm thick Pd transducer layer showed 0.6 dB change of reflectivity and $3{\sim}5$ sec of response time as it absorbed 4% hydrogen gas.
김광택,이상원,김동근,최누리,이종력,백세종,Kim, Kwang Taek,Lee, Sang Won,Kim, Dong Geun,Choi, Nu Ri,Lee, Jong Ryeok,Baik, Se Jong 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.3
We have proposed a hydrogen detection sensor based on a Pd (palladium)-coated, single-mode, optical fiber. The experimental results demonstrated that the sensor could detect hydrogen in air as well as in insulation oil. The influence of Pd film thickness and environmental temperature on response time and sensitivity was analyzed. The reflected optical power at the optical-fiber/Pd interface decreased as the concentration of hydrogen increased, in both air and the insulation oil. The sensor showed 0.75 dB of optical power variation when the concentration of dissolved hydrogen was saturated in the insulation oil.
팔라듐이 코팅된 광섬유 격자를 이용한 절연유속의 용존 수소가스 검출
김광택 ( Kwang Taek Kim ),최누리 ( Nu Ri Choi ),백세종 ( Se-jong Baik ) 한국센서학회 2018 센서학회지 Vol.27 No.6
We have investigated a fiber-optic sensor for detecting the hydrogen gas dissolved in insulation oil based on a palladium (Pd)-coated fiber Bragg grating (FBG). As the palladium absorbs the hydrogen gas dissolved in the insulation oil, its volume expands and the Bragg wavelength shifts to a longer wavelength. The experimental results showed that the Bragg wavelength of FBG increased to 70 nm when the concentration of hydrogen dissolved in the insulation oil was 409 ppm.