• Title/Summary/Keyword: fresnel lens

Search Result 102, Processing Time 0.026 seconds

Three Dimensional Shape Measurement of a Micro Fresnel Lens with In-line Phase-shifting Digital Holographic Microscopy

  • Kang, Jeon-Woong;Hong, Chung-Ki
    • Journal of the Optical Society of Korea
    • /
    • v.10 no.4
    • /
    • pp.178-183
    • /
    • 2006
  • An in-line phase-shifting digital holographic microscopy system was constructed by inserting a conventional microscope in the object arm of a Mach-Zehnder interferometer. It was used to measure the three dimensional shape of a micro Fresnel lens. It was also shown that both the lateral and the axial resolutions of the in-line phase-shifting system using a self-calibration algorithm were superior to those of the best off-axis system.

Performance Investigation of Visible Light Communication Using Super Bright White LED and Fresnel Lens (조명용 고출력 백색 LED와 프레넬 렌즈를 이용한 가시광 통신 성능연구)

  • Kim, Min-Soo;Sohn, Kyung-Rak
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.39 no.1
    • /
    • pp.63-67
    • /
    • 2015
  • White light-emitting diode (WLED) is growing interest in using both illumination and communications. This paper reports visible light communication (VLC) composed of a super bright white light-emitting diode, low cost commercial photo-diode and a Fresnel lens. LED driver is consisted of the power MOSFET and MOSFET driver that switches the LED on and off. The modulation bandwidth of the LED used was determined to be 8 MHz. However, it was possible to communicate up to 1 Mbps under illumination of 500 lx because of the weak signal power and a low spectral sensitivity of the SHF213 as a PIN photodiode. In order to enhance the system bandwidth, the LED light was focused on the PIN photodiode by use of the Fresnel lens. As a result of that, visible light link was operated up to modulation bandwidth of the LED. The signal to noise ratio can be improved by 40 dB using an optical concentration at the receiver.

Simulation of Characteristics of Lens and Light Pipe for High Concentration Solar PV System (고집광 태양광 발전을 위한 렌즈 및 광 파이프 특성 시뮬레이션)

  • Ryu, Kwnag-Sun;Shin, Goo-Hwan;Cha, Won-Ho;Myung, Noh-Hoon;Kim, Young-Sik;Chung, Ho-Yoon;Kim, Dong-Kyun;Kang, Gi-Hwan
    • 한국태양에너지학회:학술대회논문집
    • /
    • 2011.04a
    • /
    • pp.282-286
    • /
    • 2011
  • The artificial increase in the solar intensity incident on solar cells using lenses or mirrors can allow solar cells to generate equivalent power with a lower cost. In application areas of Fresnel lenses as solar concentrators, several variations of design were devised and tested. Some PV systems still use commercially available flat Fresnel lenses as concentrators. In this study, we designed and optimized flat Fresnel lens and the 'light pipe' to develop 500X concentrated solar PV system. We performed rigorous ray tracing simulation of the flat Fresnel lens and light-pipe. The light-pipe can play imporatant roles of redistributing solar energy at the solar cell and increase the mechanical tolerance so that it can increase the lifetime of the high-concentration solar PV system and decrease the cost of manufacturing. To investigate the sensitivity of the solar power generated by the concentrated solar PV according to the performance of lens and light pipe, we performed raytracing and executed a simulation of electrical performance of the solar cell when it is exposed to the non-uniform illumination. We could conclude that we can generate 95 % or more energy compared with the energy that can be generated by perfectly uniform illumination once the total energy is given the same.

  • PDF

Electric lighting energy saving through the use of a Fresnel lens based fiber-optic solar lighting system : Simulation and measurements (광화이버 및 Fresnel lens 적용 집광식 자연채광 시스템의 이용을 통한 조명에너지의 절감 : 시뮬레이션 및 실측 비교)

  • Jeong, Haejun;Kim, Wonsik;Kim, Yeongmin;Han, Hyun Joo;Chun, Wongee
    • Journal of Energy Engineering
    • /
    • v.26 no.1
    • /
    • pp.34-44
    • /
    • 2017
  • This paper deals with the effectiveness of a fiber optic solar lighting system that uses a Fresnel lens mounted on a two-axis solar tracker. A series of comparative analyses were made concerning its performance as compared to fluorescent lighting by using a simulation model based on ECOTECT and RADIANCE as well as referring to actual data. ECOTECT was used to model the test room (space) while RADIANCE was used for its indoor lighting conditions (environment). It was found that the average indoor light levels of fluorescent lighting fully satisfy the KS standard (KS A 3011, general office, class [G]: 300-400-600lux) whereas those of the solar lighting with light diffusers depends on the occlusion factor of roller shades installed on the south window.

Multi-viewing zone screen for multiview 3-D displays

  • Son, Jung-Young;Smirnov, Vadim-V.;Chun, You-Seek
    • Journal of the Optical Society of Korea
    • /
    • v.4 no.1
    • /
    • pp.62-65
    • /
    • 2000
  • A new type of multi-viewing zone screen for multiview 3-D display is described. The screen is made by stacking a Fresnel lens and a reflective prism array plate. The screen performs both focusing and beam dividing functions and directs very narrow light beams to three viewing zones for three spectators. The results of experimental testing of the screen have demonstrated that current technology of Fresnel lens and prism grooves on PMMA(Ploymethyl Methacrylate) allows manufacture of screen having a pixel size of about 1-2 mm. This size is reasonable enough for a screen with dimensions about 1m size. Optical qualities of Fresnel lenses and grooved prism arrays achieve an angular resolution for the screen of several angular minutes.

Energy Generating Self-cooling Greenhouse (열-전기 병합 에너지 생산 겸 자체 냉각 온실)

  • Kleinwachter, Jurgen;Chung, Mo;Kim, Jong-Sung
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2006.06a
    • /
    • pp.584-587
    • /
    • 2006
  • An energy generating greenhouse based on fluoropolymer envelope and fresnel lens is proposed. The outstanding properties of the fluoropolymer films make them very suitable for large scale solar applications. Extremely high optical transmission over the whole solar spectrum, combined with mechanical strength, and durability allows us to design a highly optimized greenhouses for both plant growing and energy generation. Systems such as photovoltaic triple junction cells are especially attractive since they have up to 35% efficiency with much less cell material when the sun beam is focused with concentrators such as fresnel lenses. Cooling such devices will enhance the efficiency and provide useful thermal energy that could be further utilized for various applications depending on the local demands. This article introduces the basic ideas and principles of the energy generating greenhouses as a first step towards the actual deployment of such systems under Korean environment.

  • PDF

A Characteristics of the Applied SOG Lens for the CPV Module (SOG렌즈를 적용한 집광형 태양전지모듈 특성)

  • Jeong, Byeong-Ho;Lee, Kang-Yoen;Park, Ju-Hoon;Moon, Eun-Ah;Lee, Sang-Hyun;Kim, Dae-Gon
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.61 no.2
    • /
    • pp.97-102
    • /
    • 2012
  • CPV system in the desert areas or areas near the equator, as is suitable for high-temperature region. As compared to silicon solar cells, CPV system have a high proportion of a BOS (balance of system). Solar cells because of its low proportion when designing a module technology is applied in a variety of ways. Applied to the CPV system is classified into two kinds of optical technology. One of those using fresnel lens uses refraction of light energy. The other is a mirror reflection of the structure using sprays. Both of these two ways to condense the sun to collect solar cell is a form of light. And goals by using a small solar cell materials is to produce more energy. In this paper, suitable for a domestic environment, with the aim CPV Manufacturing Technology, built on a variety of modular process technology to the development of a prototype performance analysis was carried out. In particular, silicone coated on the glass by the method of implementation of the Fresnel lens SOG(Silicon on glass) by applying the lens to absorb the solar spectrum was broad. In addition to, for the analyze to characteristics of the CPV module, developed CPV module performance and generating characteristics studied. These related technology through research and development of high-performance multi-junction solar cells, modules, development of concentrating solar power systems to facilitate the growth of the market is considered to be.

Design and Fabrication of Light-guiding Plate for a Photobioreactor by Using Sunlight and Linear Fresnel Lens (태양광과 선형 프레넬 렌즈를 이용한 광생물반응기용 도광판 설계 및 제작)

  • Kim, Hun;Shin, Seong Seon;Hwang, Min Yong;Lim, Hyon Chol;Kim, Gwang Ho;Kim, Jong Tye;Jeong, Sang Hwa;Park, Jong Rak
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.30 no.2
    • /
    • pp.143-147
    • /
    • 2013
  • We present results of the optical design and fabrication of a light-guiding plate (LGP) for a photobioreactor by using sunlight and a linear Fresnel lens. LGP patterns were designed by optical simulations with an illumination design tool, LightTools, and fabricated by using a computerized numerical control machine. Optical characteristics of average deviation of illuminance distribution and light throughput efficiency were measured and compared with simulation results.

A Study on Solar Light Collector using Fresnel Lens Film (프레넬 필름을 이용한 태양광 채광시스템 연구)

  • Jeong, H.G.;Han, S.B.;Jung, B.M.;Lee, E.J.;Lim, S.H.
    • Journal of the Korean Solar Energy Society
    • /
    • v.22 no.1
    • /
    • pp.81-86
    • /
    • 2002
  • Solar daylighting system provides free and comfort lighting, but its design and control has been key issue due to heavy light collecting system. One of the solutions for the heavy weight issues would be using a light framed film such as fresnel and prism lens. This prototype system consists of light collector, light transformer and light guide luminaire. The light collector which is installed at window or the rooftop concentrates solar light, the collected beam is converted to suitable light by the light transformer. and the prism light guide luminaire has been used to distribute light emitted from light transformer for illumination. In this paper, the design concept and performance of light collector in this prototype system are presented.

Performance evaluation by simulation for the angular luminous intensity distributions of marine lanterns using a tilting aspherical Fresnel lens and a C-8 type light bulb (기울어진 비구면 프레넬 렌즈와 C-8 type 전구를 이용한 해상용 랜턴의 배광곡선 시뮬레이션을 통한 성능평가)

  • Cho Hyun Seok;Jo Jae Heung;Park Seungl Nam;Park Chul Woung;Kim Yong Wan;Kim Jong Tae
    • Korean Journal of Optics and Photonics
    • /
    • v.15 no.6
    • /
    • pp.511-518
    • /
    • 2004
  • Providing marine signal lanterns with advantages of little weight as well as large aperture, a Fresnel lens has been adopted to transfer the beam from the lanterns up to 10 nautical miles (18.53 km). A Fresnel lens with the diameter of 250 mm and 300 mm was designed by a lens design program and optimized by adjusting the groove parameters of the lens. The angular luminous intensity distribution (ALID) of this lens was calculated by using an illumination analysis program considering the ALID of a light bulb. At the best alignment of the bulb, the maximum luminous intensities (MLI) of the lantern were 1000 cd (in the case of 250 mm diameter) and 1300 cd (in the case of 300 mm diameter). These are more than the critical value of 720 cd that is the Korean Standard of MLI for the marine lantern. The ALID was investigated as a function of misalignment from the lens focus to determine the tolerance of the alignment ranges.