• Title/Summary/Keyword: Optical engines

Search Result 42, Processing Time 0.026 seconds

Light guide based optical engine for light-valve-projection

  • Salters, B.A.;Krijn, M.P.C.M.
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.935-938
    • /
    • 2004
  • We have studied several light guide concepts for light-valve projection engines. The aim of the light guide is to replace the array of lenses and mirrors in conventional transmission-type projection engines. Volume, cost and weight can be reduced, at a similar or better performance level. Results of a first prototype are discussed.

  • PDF

Overcoming Limitations of Optical Integration Technology: Trends of Silicon Photonics-Based Optical Transceiver Technology (광집적화 기술 한계 극복: 실리콘 포토닉스 기반 광트랜시버 기술 동향)

  • Lee, J.C.;Yoo, S.H.;Seo, D.J.;Park, H.;Lee, J.K.
    • Electronics and Telecommunications Trends
    • /
    • v.37 no.3
    • /
    • pp.11-22
    • /
    • 2022
  • The development and application of silicon photonics technology to terabit optical transmission are expected in the future. Silicon photonics technology is recognized as the only technology focusing on increasing the bandwidth of data center switches. High-density integration-based small optical subassemblies, optical engines, and optical transceivers are converged with the silicon photonics technology to accelerate a revolution in optical interfaces.

Scene Text Recognition Performance Improvement through an Add-on of an OCR based Classifier (OCR 엔진 기반 분류기 애드온 결합을 통한 이미지 내부 텍스트 인식 성능 향상)

  • Chae, Ho-Yeol;Seok, Ho-Sik
    • Journal of IKEEE
    • /
    • v.24 no.4
    • /
    • pp.1086-1092
    • /
    • 2020
  • An autonomous agent for real world should be able to recognize text in scenes. With the advancement of deep learning, various DNN models have been utilized for transformation, feature extraction, and predictions. However, the existing state-of-the art STR (Scene Text Recognition) engines do not achieve the performance required for real world applications. In this paper, we introduce a performance-improvement method through an add-on composed of an OCR (Optical Character Recognition) engine and a classifier for STR engines. On instances from IC13 and IC15 datasets which a STR engine failed to recognize, our method recognizes 10.92% of unrecognized characters.

Investigation of the Liquid Fuel Film Behavior on the Cylinder Liner in an SI Engine (가시화를 이용한 가솔린 엔진의 실린더 벽면에서의 연료액막 거동 분석)

  • Cho, Hoon;Hwang, Seung-Hwan;Lee, Jong-Hwa;Min, Kyoung-Doug
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.27 no.10
    • /
    • pp.1370-1376
    • /
    • 2003
  • The investigation of liquid fuel film on the cylinder liner is an essential to understand the engine-out hydrocarbon emissions formation in SI engines. In this research, two-dimensional visualization was carried out to investigate the liquid fuel film on the quartz liner in the optical engine. For this, the optical engine with hydraulic system was designed based on the commercial SI engine. The visualization was based on the laser-induced fluorescence with total reflection technique. Using a quartz liner and a special lens, only the liquid fuel film on the liner was visualized. With using this technique, the distribution of the fuel film on the cylinder liner was measured for different engine conditions and injection timing in the optical engine.

The LCOS Optical Engine Evaluation and the Temperature Measurement

  • Mo, Chi-Neng;Chen, Ching-Chung;Wu, Shih-Min;Liu, Chia-Lin;Chen, Hun-Wei;Chang, Ming
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.947-950
    • /
    • 2004
  • The discusses of this study is that we combined the systems with a new type of LCOS optical engine and the latest color management of LMS to measure the distribution of illuminance, chromaticity and Contrast on the big size of the screen and we will focus on the distribution of temperature at the surface of the PS converter under the heat to evaluate the effectiveness of the heat dissipated faculty of the optical engine system. It will support that we design and fabricate the optics devices and optical engines.

  • PDF

Development of High Pressure & Temperature Constant Volume Chamber for Visualization Study of Fuel Spray and Combustion (연료 분무 및 연소 가시화 연구를 위한 고온 고압 정적 연소실 개발)

  • Kim, Kihyun
    • Journal of Power System Engineering
    • /
    • v.21 no.3
    • /
    • pp.12-18
    • /
    • 2017
  • Diesel and gasoline engines will be used as main power system of automobiles. Recently, engine downsizing is widely applied to both gasoline and diesel engines in order to improve fuel economy and exhaust emissions. Engine downsizing means small engine combustion chamber with higher combustion pressure. Therefore, spray and combustion process should be investigated under these high pressure and temperature conditions. In this study, constant volume combustion chamber which enables easy optical access from six directions was developed. Combustion chamber was designed to resist maximum pressure of 15 MPa and maximum temperature of 2,000 K. Combustible pre-mixed mixture was introduced into combustion chamber and ignited by spark plugs. High pressure and temperature were implemented by combustion of pre-mixed mixture. Three initial conditions of different pressure and density were tested. High repeatability of combustion process was implemented which was proven by low standard deviation of combustion pressure.

An experimental study of the deposition of inorganic salts from seeded combustion gases by optical methods (광학적 방법에 의한 연소 개스에 포함된 알칼리 금속 염의 부착에 관한 실험적 연구)

  • 김상수;우성구
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.7 no.2
    • /
    • pp.55-63
    • /
    • 1985
  • This study is focused on deposition process leading to inefficiency and hot corrosion in fossil fuel-fired furnaces and engines. An improved understanding of the coupled thermodynamics, kinetics, and transport processes governing the deposition rate of inorganic oxides and salts from hot gases containing these compounds can suggest more efficient test strategies and control measures. Accordingly, an optical re-evaporation method for accurately measuring the growth rate of deposits under laboratory burner conditions has been developed. To demonstrate the technique and provide data suitable for theoretical model development, a deliberately simple chemical system and target geometry are used. Potassium sulfate(K$_{2}$SO$_{4}$)is introduced into a premixed propane-air flat flame at atmospheric pressure. The growth rate of $K_{2}$SO$_{4}$ on an electrically heated Pt ribbon is measured by re-evaporation technique.

  • PDF

Analyzing the Spray-to-spray Interaction of GDI Injector Nozzle in the Near-field Using X-ray Phase-Contrast Imaging (X선 위상차 가시화 기법을 이용한 GDI 인젝터 노즐 근방의 분무 간 상호간섭 해석)

  • Bae, Gyuhan;Moon, Seoksu
    • Journal of ILASS-Korea
    • /
    • v.25 no.2
    • /
    • pp.60-67
    • /
    • 2020
  • Despite its benefit in engine thermal efficiency, gasoline-direct-injection (GDI) engines generate substantial particulate matter (PM) emissions compared to conventional port-fuel-injection (PFI) engines. One of the reasons for this is that the spray collapse caused by the spray-to-spray interaction forms the locally rich fuel-air mixture and increases the fuel wall film. Previous studies have investigated the spray collapse phenomenon through the macroscopic observation of spray behavior using laser optical techniques, but it is somewhat difficult to understand the interaction between sprays that is initiated in the near-nozzle region within 10 mm from the nozzle exit. In this study, the spray structure, droplet size and velocity data were obtained using an X-ray imaging technique from the near-nozzle to the downstream of the spray to investigate the spray-to-spray interaction and discuss the effects of spray collapse on local droplet size and velocity distribution. It was found that as the ambient density increases, the spray collapse was promoted due to the intensified spray-to-spray interaction, thereby increasing the local droplet size and velocity from the near-nozzle region as a result of droplet collision/coalescence.

Measurement and Analysis of Liquid Film Thickness of Pressure-Swirl Spray for Direct-Injection Gasoline-Engines (직접분사식 가솔린엔진용 고압 스월분무의 액막두께 측정 및 해석)

  • Moon, Seok-Su;Abo-Serie, Essam;Oh, Hee-Chang;Bae, Choong-Sik
    • Journal of ILASS-Korea
    • /
    • v.12 no.4
    • /
    • pp.211-219
    • /
    • 2007
  • The liquid film thickness inside a pressure-swirl nozzle was measured, and then the measured liquid film thickness was compared with the results from previous empirical equations. The liquid film inside the nozzle was visualized using extended transparent nozzles and a microscopic imaging system, and then the measurement error was evaluated using optical geometry analysis. The high injection pressures up to 7MPa were adopted to simulate the injection conditions of the direct-injection spark-ignition engines. The totally different two injectors with different fuels, nozzle lengths, nozzle diameters and swirlers were utilized to obtain the comprehensive equations. The results showed that the liquid film thickness very slightly decreased at high injection pressures and the empirical equations overestimated the effect of injection pressure. Most of empirical equations did not include the effect of nozzle length and swirler angle, although it caused significant change in liquid film thickness. A new empirical equation was suggested based on the experimental results with the effects of fuel properties, injection pressure, nozzle diameter, nozzle length and swirler angle.

  • PDF