• Title/Summary/Keyword: Illumination simulation

Search Result 190, Processing Time 0.026 seconds

The Study on the System of Improving the Assembly Tolerance of Cellphone Camera Module (휴대폰 카메라 모듈의 조립공차 개선 시스템에 관한 연구)

  • Ye, In-Soo;Cheong, Seon-Hwan;Choi, Seong-Dae;Hyun, Dong-Hoon
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.9 no.5
    • /
    • pp.57-63
    • /
    • 2010
  • Tolerance analysis is one of the most important processes to improve the image quality of products. High resolution camera module for mobile phones needs precision assembly technology since the module becomes smaller and thinner. This paper will focus on the unit tolerance and the assembly tolerance which can affect the performance of the module. Lens shading and relative illumination were used to evaluate the optical axis scatter for each component on camera and estimate the assembly yield rate based on the evaluation result. A program was developed to analyze the impact on optical axis by each module, then to optimize the dimensions and tolerance for reducing the scatter of optical axis assembly. Through the simulation, though a rate of relative illumination was declined in where optical axis is displaced $100{\mu}m$ from sensor center, MTF performance is not influenced by increasing in optical axis displacement. It was seen that assembly yield was improved in result of simulation after correcting optical axis tolerance.

Laser micromachining of optical endoscopic fiber for viewing (시야각 조절이 가능한 내시경 광섬유 레이저 가공 기술)

  • Yoo, Dongyoon;Choi, Hun-Kook;Sohn, Ik-Bu;Noh, Young-Chul;Shin, Jung-Won
    • Laser Solutions
    • /
    • v.18 no.1
    • /
    • pp.18-22
    • /
    • 2015
  • In this paper, controlling shape of optical fiber tip for endoscope was investigated for eliminating blind spot. The blind spot of endoscope is generated by divergence angle of optical fiber, so it is easy to generate blind spot when tightly focusing. In order to eliminate this region, fiber tip is necessary to be controlled as convex or concave. Illumination simulation of convex and concave type of fiber tip in the endoscope was in progress, so the distance of non- blind region was investigated in each case. As well as the simulation, the tip was fabricated as concave shape by UV laser machining. Then the beam radiation was measured to observe the blind region. The result showed that controlling the fiber tip as convex or concave shape makes the narrow blind region of illumination in endoscope.

A Deblocking Filtering Method for Illumination Compensation in Multiview Video Coding (다시점 비디오 코딩에서 휘도 보상 방법에 적합한 디블록킹 필터링 방법)

  • Park, Min-Woo;Park, Gwang-Hoon
    • Journal of Broadcast Engineering
    • /
    • v.13 no.3
    • /
    • pp.401-410
    • /
    • 2008
  • Multiview Video Coding contains a macroblock-based illumination compensation tool which can compensate the variations of illuminations according to view or temporal directions. Thanks to illumination compensation tool, the coding efficiency of Multiview Video Coding has been enhanced. However illumination compensation tool also generates additional subjective drawbacks of the blocking artifacts due to macroblock-based compensations of mean values. A deblocking filtering method for Multiview Video Coding which is the same as in H.264/AVC does not consider illumination difference between the illumination compensated blocks, thus it can not effectively eliminate the blocking artifacts. Therefore, this paper analyzes the phenomena of blocking artifacts caused by illumination compensation and proposes a method which can effectively eliminate the blocking artifacts with the minimum changes of the H.264 deblockding filtering method. In the simulation results, it can be easily found the blocking artifacts are clearly eliminated in the subjective comparisons, and the average bit-rate reduction is up to 1.44%.

100W급 LED 보완가로등 직하조도 최적화를 위한 LightTools Simulation 분석

  • Sin, Ik-Tae;Jo, Ju-Ung;Yang, Jong-Gyeong;Park, Dae-Hui
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.164-164
    • /
    • 2009
  • This paper had analyzed property of LED chip which has appropriate distribution and had designed modeling in order to experiment optical property of LED module through simulation. also throughout error value between street light and simulation data, precisive simulation could be inferred. as a consequent, transformation of optical property had henceforth verified the first value of module array.

  • PDF

The Glass Greenhouse's Lighting Simulation for Ginseng with Solar Cell and LED (태양전지와 LED를 이용한 인삼재배용 유리온실의 조도 시뮬레이션)

  • Lee, Boong-Joo
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.2
    • /
    • pp.14-19
    • /
    • 2019
  • In this study, the Relux illumination program was used to simulate the optimal lighting design for a glass greenhouse with Si and DSSC solar-cells and LEDs. The results of the daylight simulation show that the optimum conditions were a structure angle of 90o and higher transmittance. The results of the illumination simulation produced a power consumption effect of 5.6 kwh in the summer (42[%] energy savings compared to full LED control) and 7.8 kwh in the winter (58[%] energy savings compared to full LED control). The results suggest that ginseng should be grown in an energy-saving glass greenhouse.

The Optical Design and Simulation Results for LED Stage Lighting System (무대조명용 LED 광학시스템 설계 및 시뮬레이션 결과)

  • Park, Kwang-Woo;Joo, Jae-Young
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.4
    • /
    • pp.30-36
    • /
    • 2015
  • The principle of an illumination and projection system including LED light sources for a spot type stage lighting system was presented, and its optical system was designed with optimizing parameters by the analytical methods. A dichroic mirror incorporated with an illumination system to optimizing LED source positions and to obtain the compact system. The projection system was optimized with specific constraints such as a chromatic aberration, distortion aberration and angle of incidence angles. Optimized design system has a beam angle from $10^{\circ}$ to $45^{\circ}$, and its illuminance was 4,500lux at distance of 6m on the work plane.

A Study on the Convertible Emergency Lighting Fixture in Consideration of Dark Adaptation (암순응을 고려한 겸용형 비상조명등에 관한 연구)

  • Yum, Sung-Bae;Yoon, Cheol-Gu;Lee, Jung-Eun;Shin, Hye-Young;Song, Young-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.25 no.4
    • /
    • pp.24-29
    • /
    • 2011
  • When an emergency light turns on due to a blackout, the intensity of illumination is drastically changed from hundreds [1x] to 1.0[1x]. This sharp change of illumination intensity not only lowers the darkness adaptation of the eye, it also degrades the obstacle cognitive ability of the evacuees, resulting in secondary critical accidents due to anxiety, and fear. Thus, this study proposed a convertible emergency lighting fixture that controls the rate of speed of light in two stages by time with darkness adaptation of the eye in consideration. In addition, the effect of such emergency light is verified by suggesting an illumination simulation without increasing the number of light or capacity of battery to make it economically feasible.

Interior Lighting Calculation using Monte-Carlo Method (몬테카를로법을 이용한 실내조도 계산)

  • Kim Hoon
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.6 no.5
    • /
    • pp.19-26
    • /
    • 1992
  • A computer program to calculate the illumination distributions of a room interior was made. The room has a light source with arbitrary intensity distribution. The program follows the paths of the particles from the light sources, and the illumination distribution is calculated by repeating this following to many particles. Monte Carlo method is applied to the decision of the direction of the particle from light source, and the new direction of the reflected particles. Making simulation program on this basis, illumination distributions were measured for various light sources and wall surfaces tocertify the calculated results. As a results, it is known that the calculated distribution would be correct if the size of the light source is sufficiently smaller than the size of the room.

  • PDF

Analytical Model of Double Gate MOSFET for High Sensitivity Low Power Photosensor

  • Gautam, Rajni;Saxena, Manoj;Gupta, R.S.;Gupta, Mridula
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.13 no.5
    • /
    • pp.500-510
    • /
    • 2013
  • In this paper, a high-sensitivity low power photodetector using double gate (DG) MOSFET is proposed for the first time using change in subthreshold current under illumination as the sensitivity parameter. An analytical model for optically controlled double gate (DG) MOSFET under illumination is developed to demonstrate that it can be used as high sensitivity photodetector and simulation results are used to validate the analytical results. Sensitivity of the device is compared with conventional bulk MOSFET and results show that DG MOSFET has higher sensitivity over bulk MOSFET due to much lower dark current obtained in DG MOSFET because of its effective gate control. Impact of the silicon film thickness and gate stack engineering is also studied on sensitivity.

Design and Analysis of Diffractive Grating Imprinted Light-guide Plate for LCD Illumination

  • Choi, Hwan-Young;Park, Young-Pil
    • Journal of Information Display
    • /
    • v.5 no.1
    • /
    • pp.7-15
    • /
    • 2004
  • A highly simplified backlight unit mainly composed of diffractive grating in sub-micron order imprinted light-guide plate (LGP) is proposed for edge-lit backlight unit. Optical characteristics of the imprinted LGP are examined by RCWA and the performance is verified through Monte Carlo simulation. Results show that the diffraction efficiency, luminous flux and its uniformity over the area are significantly affected by the angle of incident ray. Consequently couples of design considerations are additionally proposed to enhance luminous flux. In terms of peak luminance and out-coupling luminous flux, the experimental results are agreed well with the performance simulation. Finally, compared with optical characteristics of conventional backlight unit, we could conclude that the proposed simplified backlight unit made of diffractive grating imprinted light-guide plate is a good substitute for the conventional backlight unit.