• Journal of the Korean Solar Energy Society
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• v.21 no.2
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• pp.45-54
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• 2001

In this study, the characteristics of optical fibers for the application in photocatalytic system was investigated using the intentionally designed accessories for spectrometer and radiometer to resolve the problems associated with the conventional system such as cost and structural restrictions from artificial lamp usage, to broaden the application fields into underground, and to utilize solar light in the future. To do this two kinds of optical fibers, plastic optical fiber (POF) and quartz optical fiber (QOF) were compared in terms of characteristics related with light transmittance and absorption and reactivity in TCE degradation.

• Fiber Technology and Industry
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• v.2 no.3
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• pp.333-347
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• 1998

• Journal of Sensor Science and Technology
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• v.25 no.3
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• pp.208-212
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• 2016

In this work, a loop sensor for Arc-Flash detections has been developed in order to trip a circuit breaker within 2.5 ms after an Arc-Flash event. For an efficient capturing of the flash light, plastic optical fibers, where light attenuations are larger than those in silica-based ones, with different diameters and surface conditions were utilized. The performance was comparatively analyzed with those of a point sensor and a commercialized product. The point sensor module was designed for hemisphere-like capturings of Arc-Flashes larger than 3 kA at 2 meters from the sensor. On the other hand, the loop sensor allowed 360-degree-detections around the fiber axis and the measurement range was dependent on the length of the fiber connected to the sensor module. The trip-level-dependent brightness measurement results showed that the fabricated point sensor and loop sensor satisfied a brightness condition, 10~40 klux, and the responses of the system to Arc-Flashes were completed within 2.5 ms.

• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.220-221
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• 2001

최근에 폭발적으로 늘어나고 있는 인터넷 통신이나 화상회의, 고화질 유선방송 등 정보통신 수요의 증가를 충족시키기 위해서 각 사무실이나 가정까지 광섬유를 연결하여 초고속 통신을 가능하게 하는 fiber to the office 또는 fiber to the home 계획이 선진국을 중심으로 추진 중에 있다. 최근에는 플라스틱 광섬유(POF; plastic optical fiber)에 관한 연구가 활발히 이루어지고 있다. 지금까지의 광통신에서 상용화되어 사용되고있는 유리 광섬유는 잘 부러지고 그 설치나 연결이 어렵다는 단점 때문에 가정이나 사물실에 설치하기에는 많은 어려움이 있어왔다. (중략)

• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.200-201
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• 2005

• Proceedings of the Optical Society of Korea Conference
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• 2006.02a
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• pp.169-170
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• 2006

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.50-51
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• 2002

• Proceedings of the Optical Society of Korea Conference
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• 2007.07a
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• pp.345-346
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• 2007

• Journal of Sensor Science and Technology
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• v.18 no.5
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• pp.402-407
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• 2009

In this study, plastic optical fiber sensors which can measure thermal neutron dose in a mixed neutron-gamma field are developed and characterized. Using $^{252}Cf$ and $^{60}Co$ sources, the scintillators suitable for thermal neutron detection, are tested and the scintillating lights generated from a plastic optical fiber sensor in the Kyoto University Critical Assembly (kuca) core are measured. Also, the distributions of thermal neutron and gamma-ray are measured in a mixed field as a function of the distance from the center of the reactor core at KUCA and the distribution of thermal neutron is obtained using a subtraction method. Sensitivity of the fiber-optic radiation sensor system is about 0.49 V/mW according to power of the KUCA core and its relative error is about 1.2 %.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.274-275
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• 2003

광통신 분야의 연구 중 근거리 광통신 분야에 적용하기 위한 Plastic Optical Fiber(POF)에 관한 연구와 개발이 활발히 이루어지고 있다. POF의 광전송 특성을 결정짓는 요소 중 가장 중요한 특성이 바로 굴절률 분포이다. 이에 따라 그동안 다양한 형태의 POF 굴절률 측정 방법이 연구되어 왔다. 기존 Glass Optical Fiber의 굴절률 분포 측정 방법 중 가장 일반적이고 효과적인 방법 중 하나는 coherent 빛의 간섭을 이용한 transverse interferograms을 분석하는 방법으로 Fizeau 간섭계와 같은 간섭계를 이용하여 위상변화를 측정하고 측정한 위상을 tomography적인 해석방법을 통해 굴절률 분포를 계산하는 방법이다. (중략)