• Title/Summary/Keyword: Microprobe

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3D Surface Model Generation of Micro Structure by Self Calibration of The SEM Image (SEM 영상의 자체검정에 의한 미세구조물의 3차원 표면모델 생성)

  • 이효성;박형동
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.04a
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    • pp.151-159
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    • 2003
  • This study presents method for self-calibration of the SEM(Scanning Electron Microscope) stereo image using the standard microprobe with same grid pattern and using parallel and central perspective projection equation. Result showed that parallel projection method is more suitable for standard microprobe. The maximum error of 3D coordinates acquired by this method did not exceed 5 $\mu\textrm{m}$, and DSM(Digital Surface Model) for three dimensional measurement of the rock sample was generated by the digital photogrammetry. This result can be used for quantification of micro scale change of shape and analysis of the micro morphology of rock due to weathering.

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A Study on the Structure of Premixed Turbulent Propagating Flames Using a Microprobe Method (정전탐침법에 의한 예혼합 난류전파화염의 구조에 관한 연구)

  • Kim, J.H.;Ahn, S.K.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.6
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    • pp.78-86
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    • 1995
  • The structure of premixed turbulent flames in a constant-volume vessel was investigated using a microprobe method. The flame potential signal having one to eight peaks was detected in the case of turbulent flames, each of them being regarded as a flamelet existing in the flame zone. Based on this consideration, the flame propagation speed, the thickness of the flame zone, the number of flamelets and the separation distance between adjacent flamelets in the flame zone were measured. The experimental resuits of this work suggest the existence of "reactant islands" behind the flame front when the turbulence was intensified to some extent. The critical(lowest) ratio of turbulence intensity to the laminar burning velocity being found to be about 0.7 for the formation of reactant islands in this experiment.

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Nano Aperture Microprobe Array produced by FIB process for Integrated Optical Recording Read

  • 임동수;오종근;김영주
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.81-82
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    • 2005
  • 새로운 고 용량 광 저장 시스템 개발을 위하여 초 미세 개구를 가지는 마이크로 프로브 어레이시스템 완성을 목표로 연구를 진행하였다. 효율적인 초 미세 개구 생성을 위해 기존의 제작된 마이크로 프로브 위에 FIB 공정을 이용하여 40nm 크기를 가지는 어퍼쳐를 만들었다. 나노 어퍼쳐를 가지는 마이크로 프로브 어레이는 곧 마이크로 렌즈와 VCSEL 과 일체화된 광 기록 헤드시스템으로 준비될 예정이다. 멤스 공정을 이용한 이 시스템은 향후 높은 저장 용량과 빠른 전송속도를 달성할 수 있는 차세대 광정보저장기기에 적용 가능한 새로운 광 픽업 시스템을 발전시킬 수 있을 것으로 생각된다.

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Fabrication of $Y_2O_3-ZrO_2$ and $CaO-ZrO_2$ Fibers by Sol-Gel Process and Their Phase Characterization by Raman Microprobe (졸-겔법에 의한 $Y_2O_3-ZrO_2$계와 $CaO-ZrO_2$계 섬유의 제조 및 Raman Microprobe에 의한 상분석)

  • 황진명;은희태;권혁기
    • Journal of the Korean Ceramic Society
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    • v.31 no.1
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    • pp.104-114
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    • 1994
  • ZrO2 fibers were fabricated by means of the Sol-Gel process using Zr(O-nC3H7)4-H2O-C2H5OH-HNO3 solution as a starting material. The optimum experimental parameters such as molar ratio of starting materials, concentration, temperature, viscosity, the amounts of stabilizer and the pH of solution were determined. The experimentally determined optimum variables which produce good ZrO2 fibers were used to manufacture the Y2O3-and CaO-ZrO2 fibers. The amounts of Y2O3 and CaO were varied within the range from 1.5~5 mol% and 3~15 mol% respectively. The phase transformation and microstructural evolution of the fabricated ZrO2 gel fibers were investigated after heat treatments up to 120$0^{\circ}C$ by X-ray diffraction, Raman microprobe spectroscopy, SEM, and specific surface area and pore volume measurements. From the analysis of X-ray diffraction and Raman spectra, the phase of heat treated Y2O3-and CaO partially stabilized ZrO2 gel fibers(Y2O3:2.5~3 mol%, CaO:6~9 mol%) were identified as a tetragonal phase up to 100$0^{\circ}C$. The maximum tensile strength of 2.5Y2O3-97.5ZrO2 and 6CaO-94ZrO2 (in mol%) fibers heat treated at 100$0^{\circ}C$ for 1 hr was found be 1.3~2 GPa with diameters of 10~20 ${\mu}{\textrm}{m}$.

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The Design and Construction of the Nuclear Microprobe (핵 마이크로프로브 설계 및 제작)

  • Woo, Hyung-Ju;Kim, Jun-Gon;Choi, Han-Woo;Hong, Wan;Kim, Young-Seok;Lee, Jin-Ho;Kim, Ki-Dong;Yang, Tae-Gun
    • Journal of the Korean Vacuum Society
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    • v.10 no.3
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    • pp.380-386
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    • 2001
  • A nuclear microprobe system with adjustable precision object slits and a magnetic quadrupole doublet was designed by the beam optics simulation using a first order matrix formalism, and installed in a $30^{\circ}$ beam line connected with KIGAM 1.7 MV Tandem VDG Accelerator. Demagnification factors for x and y axis are calculated to be 25 and 4.9, respectively, and a minimum beam spot side is expected to be about 5 $\mu\textrm{m}$ for 3 MeV proton beams with a current of about 1 nA. A multi-purpose octagonal target chamber has been built to facilitate MeV ion-beam analytical techniques of PIXE, RBS, ERDA, and ion beam micro-machining. It contains X-ray and particle detectors, a zoom microscope, a Faraday cup, a 4-axis sample manipulator and a high vacuum pumping system. The system performance of the nuclear microprobe is now being tested, and automatic manipulator control and data acquisition system will be installed for routine applications of micro ion-beam analytical techniques.

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SHRIMP V-Pb Zircon Age of a Felsic Meta-tuff in the Ogcheon Metamorphic Belt, Korea: Neoproterozoic (ca. 750 Ma) Volcanism (옥천변성대 규장질 변성응회암의 SHRIMP U-Pb 저어콘 연대: 신원생대(약 7.5억년전) 화산활동)

  • 조문섭;김태훈;김현철
    • The Journal of the Petrological Society of Korea
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    • v.13 no.3
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    • pp.119-125
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    • 2004
  • Using a SHRIMP ion microprobe, we have dated zircon grains of a felsic meta-tuff from the so-cal1ed Munjuri Formation, Ogcheon metamorphic belt. The weighted mean $^{206}$ Pb/$^{238}$ U zircon ages obtained from 13 spot analyses of 10 grains provide an essentially concordant age of 747${\pm}$7Ma. This result corroborates the conventional U-Pb zircon age (756${\pm}$1Ma; Lee et al., 1998) for the Neoproterozoic bimodal volcanism in the Ogcheon belt. Thus, proto-basins associated with intracontinental, high-volcanicity rift in the Ogcheon belt are most likely to have formed at ca. 750 Ma.

Effect of Mechanical Restraint due to Steel Microfibers on Alkali-Silica Reaction in Mortars (미세 강섬유의 구속력이 모르타르의 알칼리-실리카 반응에 미치는 영향)

  • Yi, Chong-Ku
    • Journal of the Korea Concrete Institute
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    • v.19 no.5
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    • pp.577-584
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    • 2007
  • The effect of steel microfibers (SMF) on alkali-silica reaction (ASR) was investigated using two types of reactive aggregates, crushed opal and a pyrex rod of constant diameter. Cracks are less visible in the SMF mortars compared with the unreinforced mortars. Due to crack growth resistance behavior in SMF mortar specimens, the strength loss is eliminated and the ASR products remained well confined within the ASR site. The expansion and the ASR products were characterized by microprobe analysis and inductively coupled plasma (ICP) spectroscopy. The confinement due to SMF resulted in a higher Na and Si ion concentration of the ASR liquid extracted from the reaction site. The higher concentration reduced the ASR rate and resulted in a lower reactivity of the reactive pyrex rods in SMF mortars.

A Study on the Effects of Reynolds Number and Damkohler Number in the Structure of Premixed Turbulent Flames (예혼합 난류화염구조에 미치는 레이놀즈 수와 담퀠러 수의 영향에 관한 연구)

  • 김준효;안수길
    • Journal of Advanced Marine Engineering and Technology
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    • v.19 no.4
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    • pp.34-41
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    • 1995
  • The structure of premixed tubulent flames in a constant-volume vessel was investigated using a schlieren method and microprobe method. The schlieren method was used to observe the flame structure qualitatively. The microprobe method, which detects a flamelet by detecting its flame potential signal, was used to investigate the deeper flame structure behind the flame front. The flame potential signal having one to six peaks was obtained in the case of turbulent flames, each of them being regarede as a flamelet existing in the flame zone. Based on this consideration, the flame propagation speed, the thickness of the flame zone, the number of flamelets and the separation distance between adjacent flamelets in the flame zone were measured. Moreover, the thickness of flamelet which could not be attempted in the conventional electrostatic probe method was also investigated. The experimental results of this work suggest the existence of "reactant islands" in the reaction zone, and show that the averaged number of flamelets increases with an increase in the turbulence intensity and/or a decrease in the Damkohler number. The mean thickness of flamelet in the case of turbulent flames was found to be about two times compared to laminar values.ar values.

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