광섬유의 착시현상을 이용한 공간 확장의 조형적 표현

양이수 ( Yee-soo Yang ),김성연 ( Sung-yoen Kim ) 한국디자인트렌드학회 2017 한국디자인포럼 Vol.57 No.-

연구배경 이전 시대는 건축 재료의 발달이 도시의 형태와 기능의 주요 변수였다. 그러나 현대는 과학기술과 정보통신의 발달이 도시 공간 구조의 변화를 추동하고 있다. 현재 우리가 살고 있는 도시는 인터넷이라는 거대한 네트워크(network)와 밀접한 관계를 맺고 있다. 이러한 네트워크 시스템은 도시의 물리적 특징이 가상화로 대체되면서 가상공간이 현대 도시의 새로운 특징으로 떠올랐다. 이러한 변화로 광섬유야말로 정보화와 세계화 그리고 속도와 이미지로 대변되는 현대적 도시를 내용적인 면에서뿐만 아니라 형식적인 면에서도 가장 잘 드러내 주는 재료이다. 이러한 광섬유가 표출하는 빛과 매체를 통한 의도적 착시현상은 도시의 스펙터클(spectacle)과 ‘나이트 라이프(Night Life)’를 대변함과 동시에 그 실질적 역량을 강화시키고 있음을 보여주고, 매체를 활용한 착시효과를 통해 도시 공간을 다의적이고 확장된 공간으로 인식할 가능성을 제시한다. 연구방법 착시의 개념과 특성에 대한 이해를 바탕으로 조형예술에서 착시현상을 이용한 사례를 분석하고, 특히 조형예술에 있어 매체를 사용하여 만들어 내는 착시현상에 대해 연구한다. 그리고 이를 토대로 광섬유와 매체가 만들어 내는 착시현상을 이용하여 도시 공간 이미지를 작품으로 구현해본다. 연구결과 무엇보다 광섬유가 가능케 한 정보이동의 혁명은 도시가 가지고 있던 기존의 경계를 무너뜨리고 도시의 범위를 세계로 확장시켰다. 이렇듯 현대 도시에서의 속도는 지금까지의 삶과 전혀 다른 리듬을 만들어 내면서 전혀 다른 차원의 인간과 도시적 삶을 이룩했는데, 광섬유는 정보통신기술에 사용된 원재료인 동시에, 현대 도시 공간의 표면화된 파워(power) 및 빠른 속도의 이미지와도 잘 부합한다. 따라서 본 연구에서는 광섬유와 착시현상을 통한 새로운 공간 확장의 조형적 표현에 대한 가능성을 확인했다. 특히 여기서는 이러한 가상적공간 확장의 조형적 표현 가능성을 도시공간의 조형화로서 표현하고자 하였는데, 이것은 세계적으로 글로벌화와 함께 비슷한 이미지로 확산해 가는 도시 공간이 광섬유라는 매체가 실제로 초래한 도시 공간의 변화를 상징적으로 보여주기 때문이다. 결론 이 논문에서는 연구자의 작업에서 주요 매체인 광섬유와 착시현상이 가시적 공간을 어떻게 다의적으로 확장할 수 있는가라는 문제에 천착하여 섬유예술의 주요한 한 재료로서 광섬유의 가지는 매체로서의 가능성을 고찰해 보았다. 특히 다양한 글로벌화 시대에 끊임없이 비슷한 유형으로 확산되는 현대 도시의 공간적 특성을 광섬유를 통하여 그것이 드러내는 빛과 그를 통하여 확산되는 가상공간에 대한 착시현상으로 인해 다양한 현대 도시의 특성을 매우 잘 드러낼 수 있는 조형 예술의 재료로서의 가능성을 잘 보여준다. 궁극적으로 이 연구는 이처럼 광섬유를 활용한 공간 설치 작업의 다양한 실험을 통해 섬유예술의 표현 영역을 응용미술 혹은 부차적 예술이라는 제한된 범위를 넘어 무한히 확장시킬 수 있음을 밝히고 자 하는데 의의를 둔다. Background If the development of architectural materials was the major variable of determining urban forms and functions in a previous era, the development of scientific technology and information communication is triggering the changes of urban space structures in modern era. The city where we are currently living has the close relationship with the enormous network, internet. As the physical characteristic of urban was substituted with virtualization, such network system has emerged as the new characteristic of modern urban. Due to this change, the optical fiber has become the material that represents the best of the contents and structures of modern urban, which can be described as informatization, globalization, and speed & image. The light and medium displayed by the optical fibers causes the intentional optical illusion, which expresses not only “Night Life” and spectacle, but intensifies the characteristics of modern urban, and it also suggests the possibility of perceiving the urban space as an expanded space that has multi-purposes. Methods Based on understanding the concepts and characteristics of optical illusion, analyze the cases using optical illusion phenomenon on formative arts and research the optical illusion produced by using medium. Based on the study, utilize the optical illusion produced by optical fiber and medium to materialize the image of urban space as the piece of art. Result The revolution of information transfer enabled by optical fiber has destroyed the existing boundary and expanded the range of urban to world-wide. The speed of modern urban has created the rhythm that is completely different from what it used to be, and established the human and the life of urban in different dimension. Since optical fiber is the raw material which used in information communication technology, it carries the image of rapid speed and externalized power of urban space. Therefore, the purpose of this study was to assure the possibility of formative expression of visualized space extension through the optical illusion using optical fiber. Especially, the modeling of urban space would be used to display the possibility of formative expression of visualized space extension, because the medium, optical fiber, symbolizes the changes of urban spaces such as globalization. Conclusion In this thesis, the possibility of the optical fiber, one of the main materials used in textile art, as the medium was explored by scrutinizing the question, how the optical fiber and optical illusion can be used to expand purposes of a visible space. The optical fiber well-reveals the various spatial characteristics of modern urban through the optical illusion of visualized space that can be expanded by the light created by the optical fiber, which assures the possibility of the optical fiber as the material of formative arts. Ultimately, the goal of this research is to disclose the possibility of expanding an expression realm of textile art infinitely beyond the limited area such as applied art or subordinate art through the various experiments of the installation of space using the optical fiber.

Strain pattern detection of composite cylinders using optical fibers after low velocity impacts

Choi, Bo-Hun,Kwon, Il-Bum Elsevier 2018 Composites science and technology Vol.154 No.-

<P><B>Abstract</B></P> <P>The strain pattern distributed on composite cylinders after impacts was detected using optical fibers for the first time. The sensing optical fiber was implemented on the composite cylinders using aluminum (Al)-coated optical fiber, polyimide-coated optical fiber, or standard single mode fiber (SSMF) of polymer-coating. The residual strain of this sensing fiber was measured by a Brillouin optical correlation domain analysis (BOCDA) sensor system, using phase modulation and single side band modulation methods. Impact events of 10, 20, and 40 J energies as barely visible impact damages (BVID) were applied on the cylinders, and these fibers were deployed on the cylinder surface, or were embedded in the cylinders. For the surface deployment, Al-coated fiber exhibited the highest residual strain due to Al plastic deformation, and the strain was three times higher than the lowest SSMF value. For the embedment deployment, these fibers were individually embedded in the cylinder, which was composed of sixteen carbon fiber reinforced polymer layers using a filament winding process. In contrast to the surface deployment, the embedded SSMF gave as high residual strain as that of the Al-coated fiber. These similar residual strains of the three embedded optical fibers suggested that they came from permanent material damage inside the material. Impact events with fiber embedment caused the optical signal in the Al-coated fiber to suffer serious additional insertion loss, but the SSMF did not show loss. So the general fiber for optics communications was successfully demonstrated as a distributed residual strain sensor to detect BVID impacts of composite materials. The strain values were maintained for at least 15 months after impact events. This residual strain sensor is economical, because special fibers like Al-coated fiber were not needed, and the sensor is efficient, because it could sense the strain for long distance, without additional impact-driven insertion loss.</P>

광통신 시스템하에서 광선로의 이중화를 적용한 광섬유 절체기 설계 및 개발

이재우 경복대학 2003 京福論叢 Vol.7 No.-

광통신시스템은 대용량의 정보를 고속으로 송수신 할 수 있는 광섬유를 기반으로 한 통신망이다. 오늘날과 같은 멀티미디어 통신시대에는 음성 및 영상정보를 고속으로 전송하고 사회 각 분야에서의 광섬유를 매개체로 하는 종합서비스 시스템을 필요로 하여 다양한 광통신시스템이 구축되어 운영 중에 있다. 이러한 광대역 전송시스템하에서 통신용량의 증가와 대용량 고속 통신으로 이루어진 정보화사회의 광통신 기반 시스템이 광선로에 사고가 생겨 제 기능을 다하지 못한다던 지역공동체 기능이 마비되고 경제적인 손실이 매우 클 것이다. 본논문에서는 이러한 광통신 시스템하에서 발생할 수 있는 광선로 사고에 대비하기 위하여 광선로를 이중화함으로써 광통신시스템의 단절없는 운영을 위한 광선로 절체기를 설계하고 제작하였다. 광선로 절체기는 광선로의 단선이나 장비의 이상을 감지하여 예비선로 및 예비장비로 자동절환하는 기능을 가지는 광선로 스위칭장비이다. 본 논문에서 설계, 제작한 광섬유 절체기는 기존에 연계된 광통신장비를 변경할 필요없이 동작할 수 있어서 각종 상업망이나 국가기간망의 안정적인 운영을 가능하게 할 수 있다. Fiber optic communication systems enable us to communicate large amount of information with each other rapidly based on optical fiber. Nowadays it is needed to construct or manage integrated service systems that can be used in our society whole to communicate multimedia data such as text, image, audio and video data. In these wide optical communication systems, if any problem with optical lines occur, there are many economical loss in our information society including being in a state of disorder. In this paper, we design and construct fiber route switch(FRS) to protect our fiber optic communication systems from optical line incident using duplicated optical transmission line. The fiber route switch(FRS) is for monitoring optical lines and switching redundancy lines when the optical line do not well. Using our designed fiber route switch, our fiber optic communication systems can do well without any change of current optical communication resources.

고출력 광섬유 레이저를 위한 광섬유 칩 기반 All-fiber 7 x 1 펌프 광 결합기 제작

최인석,전민용,서홍석 한국광학회 2017 한국광학회지 Vol.28 No.4

In this paper, we report measured results for an all-fiber 7 × 1 pump combiner based on an optical fiber chip for high-powerfiber lasers. An optical-fiber chip was fabricated by etching a fiber, having core and cladding diameters of 20 and 400 μm, inthe longitudinal direction. To both ends of the etched chip, we spliced input and output fibers. First, we tied together seven opticalfibers, having core and cladding diameters of 105 and 125 μm respectively, in a cylindrical bundle and spliced them to the375-μm end of the optical-fiber chip. Then, we attached an output DCF with core and cladding diameters of 25 and 250 μmto the 250-μm end of the optical-fiber chip. Finally, the fabricated 7 × 1 pump combiner showed an average optical couplingefficiency of about 90.2% per port. This chip-based pump combiner may replace conventional pump combiners by massiveproduction of fiber chips.

Design of Illuminating Car Seats based on Woven Fabric of Optical Fiber

( Ha Young Song ),( Ha Kyung Cho ) 한국감성과학회 2014 감성과학 Vol.17 No.1

In recent days, according as ergonomics and aesthetic engineering are important factors in the product market, there is a demand to develop automobile seat and interior designs which are focused on sensitive elements such as aesthetic and comfort features in order to satisfy the sensitive needs of consumers. To meet such demands, car seats are turning into functional and sensitive products that reflect elements of function and entertainment. According to such trends, this research is aimed to develop the illuminating car seat fabric that serve such functions as recognizing and reacting to car environments, which includes sensing over-speed, open doors, and unfastened safety belts through the illuminating car seat fabrics by optical fiber. For this purpose, basic physical properties of optical fiber are analyzed, appropriate weaving and etching technologies are applied, and the woven fabric of optical fiber for car seats are illuminating depend upon car environments. Moreover, the applicable woven fabric of optical fiber is deduced after evaluating the physical properties (such as tensile strength, heatproof, anti-fouling, washable and combustible traits) for the appropriateness of applying the woven fabric of optical fiber to car seats. For this purpose, the woven fabric of optical fiber is covered according to car seat processes; the optical fiber applied to seats is composed that it may be connected to one end of the connector linked to a LED so that it may perform functions like sensing over-speed, open doors, and unfastened safety belts; the sensed signals are transmitted to the control part, and luminescent signals are transmitted to LED.

고속주축 모니터링용 광파이버 변위센서의 파이버 특성에 따른 센서 성능 연구

박찬규,신우철,배완성,홍준희,이동주 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

To make high speed spindle system work properly, sensors with outstanding resolution and dynamic characteristics are essential. An optical fiber displacement sensor is based on simple principles. Electrical signal responds to the optical flux change due to the displacement change between a target and a sensor probe. In this paper, the performance of optical fiber displacement sensor has been investigated according to properties of optical fiber. Firstly, optical loss has been measured before and after polishing optical fiber endface. Secondly, allowance of optical fiber bending has been tested. thirdly sensitivity and linear range of the sensor has been found out according to the shape of cross section of optical fiber.

Phase Sensitivity to Acoustic Pressure of Microstrustured Optical Fibers : A comparison Study

Adel Abdallah,Zhang Chaozhu,Zhong Zhi 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.2

Recently, photonic crystal fibers (PCFs) have attracted many researchers because of their unique properties, and design flexibility that can’t be realized by conventional fibers. One of the fruitful areas of research is the optical fiber hydrophone. In this paper, the finite element solver (FES), COMSOL multiphysics, is used to study and compare the response to acoustic pressure of a hollow-core photonic band gap fiber (HC-PBF), a solid-core photonic crystal fiber (SC-PCF), and a conventional single-mode fiber (SMF) for different acoustic pressures in the frequency range from 10 kHz to 50 kHz. The key structural factors affect the sensitivity to acoustic pressure (S) of the microstructured fibers are studied and a mathematical formula describes the relation of S and the dominant structural factor is proposed. Simulation results of the investigated optical fibers show that the normalized responsivity (NR) of the HC-1550, LMA-5, and SMF are -344 dB, -367.5 dB, and -366 dB, respectively. The proposed simulation results are in good agreement with published theoretical and experimentally measured results. The proposed results indicate the significance of the HC-PBFs in the future hydrophone systems and are useful for the design of microstrustured optical fibers for sensing applications.

Length Effects of Hetero-Core Optical Biosensor based on Evanescent Field Absorption

심준환,손경락,찬주광 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.9

Sensing performances of evanescent field absorption (EFA) hetero-core fiber sensor has been presented based on EFA by changing the length and the core diameter of the single mode fiber. Experimental results have demonstrated a good feature in their relationship between the length and the core diameter of the single mode fiber. The sensor consists of 2 fiber optics which have the same cladding diameter of 125 ㎛. However one fiber optic used is single mode and has varying core diameter ranging from 3.3 to 5.6 ㎛. The other fiber is multimode type and has a thicker fixed core diameter of 62.5 ㎛. The 2 fiber optics are thermally spliced together. Experiments conducted to measure the resonance wavelength were carried out over a range of refractive index, to find the optimum sensing length. Experiments show that core diameter of the single mode fiber and sensing length affects the linearity and sensitivity. Sensing performances of evanescent field absorption (EFA) hetero-core fiber sensor has been presented based on EFA by changing the length and the core diameter of the single mode fiber. Experimental results have demonstrated a good feature in their relationship between the length and the core diameter of the single mode fiber. The sensor consists of 2 fiber optics which have the same cladding diameter of 125 ㎛. However one fiber optic used is single mode and has varying core diameter ranging from 3.3 to 5.6 ㎛. The other fiber is multimode type and has a thicker fixed core diameter of 62.5 ㎛. The 2 fiber optics are thermally spliced together. Experiments conducted to measure the resonance wavelength were carried out over a range of refractive index, to find the optimum sensing length. Experiments show that core diameter of the single mode fiber and sensing length affects the linearity and sensitivity.

Characterization of Light Transmissions in Various Optical Fibers with Proton Beam

송영범,김해진,김민건,이봉수,신상훈,유욱재,장경원,황성원 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.11

As a feasibility study on the development of a fiber-optic radiation sensor for proton therapy dosimetry, we characterized light transmissions of various commercial optical fibers such as silica and plastic based optical fibers by the irradiation of proton beams. In this study, we measured light transmission spectra of optical fibers as a function of absorbed doses of proton beams using a deuterium & tungsten halogen lamps and a spectrometer. To be used as a fiber-optic radiation sensor, the optical fibers should have the radiation resistant characteristics and provide stable output signals during the proton beam irradiation. In this study, we could select suitable optical fibers to be used in the fiber-optic radiation sensor without quenching effects for proton therapy dosimetry. As a result, the light transmittance of the optical fibers had decreasing trends with increasing absorbed dose as expected.

Comparative Study on Background Signal of the Optical Fiber Cable of the Existing and New Equipment for CANDU-Type Spent Fuel Verification

Sung-Woo Kwak,Hojik Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

During PIV (Physical Inventory Verification), the IAEA has been inspecting the CANDU-Type spent fuels using an optical fiber-based scintillation detector. KINAC has developed a new verification instrument to deal with problems of the existing one such as low sensitivity, heavy and large dimension, and inconvenience-in-use. Our previous studies focused on how to develop the new instrument and had not included its performance tests. Field tests were carried out recently at Wolsung unit 4 to evaluate performance of the existing and new instruments. The objective of this paper is to discuss background noise produced in the optical fiber signal cable itself. The verification equipment for the CANDU-type Heavy Water Reactor spent fuels uses a scintillation detector to bond a scintillation material to the end of an optical signal cable. At this time, the radiation signal obtained by a data acquisition system is the signal generated from the scintillator (p-terphenyl organic scintillator) and the optical signal cable ; The signal produced in the optical cable itself is background noise to degrade the spent fuel verification equipment. To characterize the background radiation noise, the spent fuel bundles at Wolsung Unit 4 were measured using the optical fiber cable without the radiation scintillator. This signal is generated by reaction of the optical cable and the radiation emitted from the spent fuel. From experimental results, it was observed that the background noise signal of the optical cable increased as the optical cable went down in the downward direction, because the cable length irradiated by the radiation increased with the optical cable area in the spent fuel storage pool. Difference in the background noise signal was dependent on the location of the vertical direction and the signal of the new optical cable was up to about 5 times higher than that of the existing cable. While, the new cable has the cross-section area about 3.2 times larger than the old cable. Our past studies showed that total signal amplitude – sum of signals generated from the scintillator and optical fiber - of the new verification instrument was at least about 15 times greater than that of the existing one. Considering the total signal and background noise signal, from this measured results, it was confirmed that the scintillator characteristics – in particular, light output and decay time – has a dominant impact on the signal sensitivity of the newly developed instrument. More details will be discussed at the conference.