• Title/Summary/Keyword: Laser parameters

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Capturing Distance Parameters Using a Laser Sensor in a Stereoscopic 3D Camera Rig System

  • Chung, Wan-Young;Ilham, Julian;Kim, Jong-Jin
    • Journal of Sensor Science and Technology
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    • v.22 no.6
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    • pp.387-392
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    • 2013
  • Camera rigs for shooting 3D video are classified as manual, motorized, or fully automatic. Even in an automatic camera rig, the process of Stereoscopic 3D (S3D) video capture is very complex and time-consuming. One of the key time-consuming operations is capturing the distance parameters, which are near distance, far distance, and convergence distance. Traditionally these distances are measured by tape measure or triangular indirect measurement methods. These two methods consume a long time for every scene in shot. In our study, a compact laser distance sensing system with long range distance sensitivity is developed. The system is small enough to be installed on top of a camera and the measuring accuracy is within 2% even at a range of 50 m. The shooting time of an automatic camera rig equipped with the laser distance sensing system can be reduced significantly to less than a minute.

An Exact 3D Data Extraction Algorithm For Active Range Sensor using Laser Slit (레이저 슬릿을 사용하는 능동거리 센서의 정확한 3D 데이터 추출 알고리즘)

  • Cha, Y.Y.;Gweon, D.G.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.8
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    • pp.73-85
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    • 1995
  • The sensor system to measure the distance precisely from the center of the sensor system to the obstacle is needed to recognize the surrounding environments, and the sensor system is to be calibrated thoroughly to get the range information exactly. This study covers the calibration of the active range sensor which consists of camera and laser slit emitting device, and provides the equations to get the 3D range data. This can be possible by obtaining the extrinsic parameters of laser slit emitting device through image processing the slits measured during the constant distance intervals and the intrinsic parameters from the calibration of camera. The 3D range data equation derived from the simple geometric assumptions is proved to be applicable to the general cases using the calibration parameters. Also the exact 3D range data were obtained to the object from the real experiment.

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A study on the core technologies for industrial type digital 3D SFF system

  • Kim, Dong-Soo;An, Young-Jin;Kim, Sung-Jon;Choi, Byung-Oh;Lim, Hyun-Eui
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.2170-2174
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    • 2005
  • Selective Laser Sintering (SLS) is a useful rapid prototyping technique for the manufacture of three dimensional (3D) solid objects directly from a scanning data. A new approach called a Selective Multi-Laser Sintering (SMLS) system has been developed at Korea Institute Machinery & Materials (KIMM) as an industrial type SFFS. This SMLS machine is built with a frame, heaters, nitrogen supply part, laser system. This system uses the dual laser and 3D scanner made in $Solutionix^{TM}$ to improve the precision and speed for large objects. The three-dimensional solid objects are made of polyamide powder. The investigation on each part of SMLS system is performed to determine the proper theirs design and the effect of experimental parameters on making the 3D objects. The temperature of the system has a great influence on sintering the polymer. Because the stability of the powder temperature prevents the deformation of each layer, the controls of the temperature in both the system and the powders are very important during the process. Therefore, we simulated the temperature distribution of build room using the temperature analysis with ANSYS program. Selected radiant heater is used to raise temperature of powder to melting point temperature. The laser parameters such as scan spacing, scan speed, laser power and laser delay time affect the production the 3D objects too. The combination of the slow scan speed and the high laser power shows the good results without the layer curling. The work is under way to evaluate the effect of experimental parameters on process and to produce the various objects. We are going to experiment continuously to improve the size accuracy and surface roughness.

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Laser Marking Process for LCD Light Guide Panel (LCD 백라이트 도광판 제조용 레이저 마킹에 관한 연구)

  • 김경동;백창일;송철기;안성훈
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.1
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    • pp.79-84
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    • 2003
  • A light guide panel is an element of the LCD backlight module that is often used for the display of compact electronic devices. In this study, a laser marking system is proposed to fabricate light guide panel, which can replace other manufacturing methods such as silk printing, stamping, or v-cutting methods. The objective of this research is to evaluate the process parameters of the laser marking system. Light guide patterns were marked with a 50W $CO_2$ laser (CW) to understand the effects of average power and scanning speed on the geometry and quality of groove pattern. The width of the fabricated grooves increases with increasing laser power and decreasing scan speed. In order to analyze surface characteristics and optical properties (luminance, uniformity), SEM photography and BM7 (luminance measuring system) were used. As a result, the optimal conditions of the process parameters were determined.

Formation of Silicon Nanoparticles Using Laser Pyrolysis (레이저 열분해법을 이용한 실리콘 나노입자 제조)

  • Park, Joo Hyung;Lee, Jae Hee;Song, Jinsoo;Lee, Jeong Chul
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.105.1-105.1
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    • 2011
  • To enhance the performance of photovoltaic a-Si:H solar cells with a hybrid-type light absorbing structure of single crystal silicon nanoparticles (Si NPs) in a-Si:H matrix, single crystal Si NPs were produced by laser pyrolysis. The Si NPs were synthesized by $SiH_4$ gas decomposition using a $CO_2$ laser. The properties of Si NPs were controlled by process parameters such as $CO_2$ laser power, reactive gas pressure, and $H_2/SiH_4$ gas flows. The crystalline properties and sizes of Si NPs were analyzed by High Resolution Transmission Electron Microscopy (HRTEM). The sizes of Si NPs were controllable in the range of 5-15 nm in diameter and the effects of process parameters of laser pyrolysis were systematically investigated.

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Effect of Process Parameters on Laser Weldability of AZ31 Magnesium Alloy (AZ31 마그네슘합금의 레이저 용접성에 미치는 공정변수의 영향)

  • Kim, Jong-Do;Kil, Byung-Lea;Lee, Jung-han
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.4
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    • pp.570-577
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    • 2008
  • Magnesium alloys are potentially useful as structural materials due to higher strength/weight ratio, heat conductivity and recyclability compared to other alloys. These alloys have attracted the interest of modern manufacturing such as the automobile, computer, communication and consumer electronic appliances industries. Hence welding techniques are required to be developed for these applications. Laser are known to be an excellent tool for them. This paper presents the laser weldability of AZ31 magnesium alloy with CW Nd:YAG laser. The low viscosity and surface tension of the melt pool make magnesium more difficult to weld than steel. As a result of this study, optimal process parameters could be obtained without weld defects. Also it was certain that cutting methods had influence on butt weldability.

A study on the output characteristics of Long-pulse Alexandrite laser for hair removal (제모용 Long-Pulse Alexandrite Laser의 출력 특성 연구)

  • Choi, Jin-Young;Kim, Sang-Gill;Kim, Tae-Kyun;Bark, Jong-Woong;Song, Gun-Ju;Jung, Yong-Ho;Hong, Jung-Hwan;Kim, Hee-Je
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1729-1731
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    • 2003
  • Recently many solid-state laser systems were widely used in the medical applications. So it is necessary to study various optimal laser parameters for adopting new medical treatments. Alexandrite laser using switching mode power supply has designed and experimented to adjust a pulse repetition rate by PIC one-chip microprocessor. The fundamental results have been obtained during the first financial year in 2002. We will be able to find out the optimal hair removal characteristics by the repetitive experiments of Alexandrite laser as the parameters such as pulse repetition rate, pulse width, and pulse energy etc.

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The Design of Manufacturing Process Optimization for Aluminum Laser Welding using Remote Scanner (원격 스캐너를 이용한 알루미늄 레이저 용접에 대한 생산 공정 최적화 설계)

  • Kim, Dong-Yoon;Park, Young-Whan
    • Journal of Welding and Joining
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    • v.29 no.6
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    • pp.82-87
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    • 2011
  • In this study, we conducted laser welding by using remote scanner that is 5J32 aluminum alloy to observe the mechanical properties and optimize welding process parameters. As the control factors, laser incident angle, laser power and welding speed were set and as the result of weldablility, tensile shear tests were performed. ANOVA (Analysis of Variation) was also carried out to identify the influence of process variables on tensile shear strength. Strength estimation models were suggested using regression alnalysis and 2nd order polynomial model had the best estimation performance. In addition optimal welding condition was determined in terms with wedalility and productivity using objective function and fitness function. Final optimized welding condition was laser power was 4 kW, and welding speed was 4.6 m/min.

Optimization of Laser Process Parameters for Realizing Optimal Via Holes for MEMS Devices (MEMS 소자의 비아 홀에 대한 레이저 공정변수의 최적화)

  • Park, Si-Beom;Lee, Chul-Jae;Kwon, Hui-June;Jun, Chan-Bong;Kang, Jung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.11
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    • pp.1765-1771
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    • 2010
  • In the case of micro.electro-mechanical system (MEMS) devices, the quality of punched via hole is one of the most important factors governing the performance of the device. The common features that affect the laser micromachining of via holes drilled by using Nd:$YVO_4$ laser are described, and efficient optimization methods to measure them are presented. The analysis methods involving an orthogonal array, analysis of variance (ANOVA), and response surface optimization are employed to determine the main effects and to determine the optimal laser process parameters. The significant laser process parameters were identified and their effects on the quality of via holes were studied. Finally, an experiment in which the optimal levels of the laser process parameters were used was carried out to demonstrate the effectiveness of the optimization method.

Investigation of Zircaloy-4 weldability using a pulsed Nd:YAG laser (펄스형 Nd:YAG 레이저를 이용한 지르칼로이-4 용접특성 조사)

  • 김수성;김덕현;김철중;이종민
    • Journal of Welding and Joining
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    • v.9 no.1
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    • pp.23-31
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    • 1991
  • Laser beam weldability of zircaloy-4was investigated using a pulsed Nd: YAG laser of 200W average power. Mechanical properties of laser and GTA bead-on-plate welded zircaloy-4 test specimens were compared. The influence of plasma generated during laser welding was analyzed and optimum laser welding parameters were investigated.

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