• Title, Summary, Keyword: 광감도

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Luminous efficiency's estimation method of transmitted light in lenses (렌즈에서 투과된 광의 시감도 추정 방법)

  • Kim, Yong-Geun
    • Journal of Korean Ophthalmic Optics Society
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    • v.8 no.2
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    • pp.163-168
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    • 2003
  • The eye sensitivity in the difference conditions of a light source intensity consists of two functions by the receptor of cone and rod according to a wavelength. We derived a distribution function of $P{\lambda}=A{\cdot}e^{-({\lambda}-{\lambda}_u)^2/2W^2}$ using a respond probability of the receptor of cone-rod for a photon. It was well applied for a CIE eye's sensitivity curve of a wavelength. When there is lens In front of eye, luminous efficiency should be corrected. Transmission light which permeate to depends on absorption wavelength, and relationship of final luminous efficiency's estimation method is expressed by multiplication of luminous efficiency and transmittance intensity of lens. $$Pf({\lambda})=T({\lambda}){\cdot}P({\lambda})$$. The theory was applied to photopic and scopic vision with brown color lens.

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Implementation of weight sensor with polarization maintaining photonic crystal fiber (편광유지 광결정 광섬유를 이용한 무게센서)

  • Kim, Eung-Soo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.1
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    • pp.133-138
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    • 2015
  • A weight sensor with a polarization maintaining photonic crystal fiber (PCF) is proposed and investigated by experimentally. The sensor system consists of a 3 dB fiber coupler, a half-wave plate, and light source. Wavelength shift induced by weight acting on the polarization maintaining PCF was measured. Two types of sensor patterns, circle type and straight type, were implemented and evaluated. The sensitivity of straight line type was 680 pm/kg and the circle type was 270 pm/kg, respectively. The both types of sensors have a good sensitivity and good linearity in the wide range.

Influence of Environmental Conditions on the Sensitivity of a Mandrel Type Fiber Optic Acoustic Sensor (주위 환경이 맨드릴형 광-음향센서의 감도특성에 미치는 영향)

  • 임종인;노용래
    • The Journal of the Acoustical Society of Korea
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    • v.19 no.2
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    • pp.8-12
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    • 2000
  • This paper describes the sensitivity stability of a mandrel type fiber optic acoustic sensor with respect to its environmental conditions such as hydrostatic pressure and underwater temperature. The sensors under consideration have various mandrel structures such as a cylindrical mandrel, a concentric composite mandrel, and an air-backed concentric composite mandrel. The analysis results show that the sensors have such good robustness, less than 0.15dB, in its sensitivity with respect to the variation in hydrostatic pressure. Further, the nylon concentric composite mandrel type sensor including an air cavity turns out to have the most superior stability than others to the underwater temperature variations.

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Highly Sensitive Partial Discharge Sensor with Remote Monitoring Capabilities (원격감시 기능을 갖는 고감도 부분방전센서)

  • Choi, Kyoo-Nam
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.3
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    • pp.349-356
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    • 2015
  • Remote monitoring partial discharge sensor, equipping with hybrid filter combining optical and electrical noise reduction capabilities and with signal integrating function to calculate total arc energy, was investigated. Hybrid filter showed insensitivity to fluorescent and incandescent lamps under simulated distribution panel condition. Signal integrating function showed selective detection capability corresponding to different arc energy levels, while convention arc sensor had difficulty to discriminate arc energy level due to bursty arc waveform and peak level detection characteristics. The sensor showed possibility for application to remote monitoring partial discharge sensor, since it detected arc energy level corresponding to normal open and close discharge in low voltage 100A MCCB at 2m distance.

Research on Optimizing Luminosity Factor Through Color Filter $Y_{1-X}G_X$, $Y_{1-X}P_X$ ($Y_{1-X}G_X$, $Y_{1-X}P_X$ 칼라필터를 통한 시감도 최적화 연구)

  • Kim, YongGeun;Park, Hyun-Ju
    • Journal of Korean Ophthalmic Optics Society
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    • v.14 no.1
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    • pp.47-56
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    • 2009
  • Purpose: To find optimized luminosity factor of color from light transmission filter. Methods: To make $Y_{1-x}G_{x}$, $Y_{1-x}P_{x}$ by using CR-39 compound within dipping method, mixing up Y(Yellow), G(green) and P(pink) for optimize eye sensitivity. Modeling for relative luminous efficiency(relative sensitivity) curves in Luminose transmission, it could be resolved by Multiplying sensitivity of eye within transmission rate of Lens ($P_f({\lambda}=T({\lambda}){\cdot}P({\lambda}).)$.). To evaluate Wavelength between 400~700 nm, relative luminous efficiency curve in Area and Height value is being used. Results: In color filter of $Y_{1-x}G_{x}$ position of x equals to 0.04, 0.1, 0.08, 0.12, 0.14, 0.5 at ${\beta}=S_1/S_0{\cdot}100$ each consist value of 76.1, 77.9, 80.7, 81.6, 80.2, 18.6 In color filter of $Y_{1-x}P_{x}$ position of x equals to 1.00, 0.2, 0.6, 0.8 at ${\beta}=S_1/S_0{\cdot}100$ each consist value of 74.3, 74.0, 70.5, 33.0 The result from experiment $Y_{1-x}P_{x}$ value less than $Y_{1-x}G_{x}$, from evaluating luminous efficiency curve and test was successfully optimized. Conclusions: Optimized relative luminous efficiency curve result have value of X=0.12-0.14 at $Y_{1-x}G_{x}$.

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Development of optical current transformer used an optical fiber for 170 kV GIS (광섬유를 이용한 170 kV GIS용 전류 측정 장치의 개발)

  • Jung, J.Y.;Kim, D.L.;Kim, B.T.;Park, J.N.;Kim, Y.G.;Seo, J.M.;Ham, G.H.
    • Proceedings of the KIEE Conference
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    • pp.1978-1980
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    • 2003
  • 본 논문에서는 광을 이용한 전류 측정 장치의 연구 내용에 대하여 기술하였다. 광을 이용한 전류 측정 장치의 가장 큰 문제점은 감도 저하를 주는 선형 복굴절 양이며, 이러한 선형 복굴절을 줄이는 방법은 광섬유를 비틀어서 선형 복굴절 양에 비해 원형 복굴절의 양을 크게 해주는 방법을 사용하였다. 광섬유를 비틀어서 측정한 결과는 측정 감도가 약 3배의 증가를 보였으며, 측정오차의 경우도 1 % 이내의 선형성을 나타내었다. 본 실험의 결과로 광섬유를 비트는 방법이 광을 이용한 전류 측정 장치의 선형 복굴절을 크게 감소시킴을 알 수 있었으며, 대전류 측정에 측정도를 높일 수 있다고 판단된다.

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A Study on the Reception Sensitivity of the Optical Receiver with the Order Change of the Optical Filter in Optical Preamplifier System (광 전치 증폭시스템에서 광필터의 차수변화에 따른 광수신기의 수신감도에 관한 연구)

  • Ra, Yoo-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.3
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    • pp.218-223
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    • 2016
  • This study examined the order of the Butterworth filter for the correlation on the sensitivity of the receiver in the receiver of an optical system. In the general case, the sensitivity of the receiver is increased if the order of the filter was increased more. This is because increasing the order of the filter response of the normalized frequency of the filter is similar to the rectangular wave. For that reason, the method used to increase the order of the filter increases the sensitivity of the receiver. On the other hand, a method of increasing the order of the filter and makes the system complicated increases the cost of the system. This study examined the correlation between the order of the sensitivity of the receiver filter and to configure the system by simply looking for ways to reduce the cost of the system. The simulation results showed that increasing the order of the filter resulted in a receiver that can determine if the sensitivity is raised. In addition, the order of the Butterworth filter range that does not reduce the sensitivity of the receiver was 2. Therefore, it will be possible to implement an inexpensive optical system of the receiver using the data from this study.

Bit Error Rate Dependence on Amplifier Spacing in Long-Haul Optical Transmission System with Mid-Span Spectral Inversion (Mid-Span Spectral Inversion 기법을 채택한 장거리 광 전송 시스템에서의 증폭기 간격에 따른 비트 에러율)

  • Lee, Seong-Real
    • The Journal of Advanced Navigation Technology
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    • v.9 no.2
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    • pp.109-120
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    • 2005
  • In this paper, bit error rate (BER) characteristics, sensitivity and minimum allowable launching power are numerically investigated as a function of amplifier spacing that consisted of 1,200 km WDM systems with MSSI method. It is conformed that the sensitivity and minimum allowable launching power are gradually degraded as amplifier spacings are gradually expanded, but those are not largely affected by modulation format. The sensitivity of RZ transmission system is smaller than that of NRZ transmission system, but minimum allowable launching power of NRZ transmission system is smaller than that of RZ transmission system. And, it is confirmed that the best amplifier spacing in NRZ and RZ transmission system is less than 50 km, because the sensitivity and minimum allowable launching power are less affected by fiber dispersion, channel wavelength and pump light power.

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A Novel Photoresist based on Polymeric Acid Amplifier (고분자형 산 증식제에 기초한 새로운 포토레지스트의 연구)

  • Lee, Eun-Ju;Jeong, Yong-Seok;Lim, Kwon-Taek;Jeong, Yeon-Tae
    • Journal of the Korean Chemical Society
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    • v.48 no.1
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    • pp.39-45
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    • 2004
  • Acid amplifying copolymers are synthesized by the copolymerization of tert-butyl methacrylate(tBMA) with acid-sensitive functional group and 4-hydroxy-4'p-styrenesufonyloxyisopropylidene dicyclohexane(HSI) or 4-p-styrenesulfonyloxy-4'-tosyloxyisopropylidenedicyclohexane(STI) with acid-amplifying group as novel polymeric acid amplifying photoresists. Poly(HSI-co-tBMA) film and Poly(STI-co-tBMA) film as acid amplifying photoresists show reasonable thermal stability in the absence of an acid species. Poly(STI-co-tBMA) film exhibits 2X higher photosensitivity, whereas Poly(HSI-co-tBMA) film show 2X lower photosensitivity compared with ptBMA homopolymer. The attachment of acid-amplifying units to polymer backbones could provide a novel way to enhance the photosensitivity of acid-sensitive polymers depending on the structure of acid-amplifying units.

광섬유 격자 기술

  • 이경식;조상연;이종훈
    • 전기의세계
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    • v.46 no.12
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    • pp.41-47
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    • 1997
  • 광감도 현상 그리고 여러가지의 광섬유 격자 제작 방법 및 광섬유 적용 분야에 대해서 고찰해 보기로 하자.

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