• Title/Summary/Keyword: Optical surface scanning

Search Result 534, Processing Time 0.099 seconds

Fabrication of Micro Mirror Array for Small Form Factor Optical Pick-up by Micro UV-Molding (마이크로 UV성형을 통한 초소형 광픽업용 마이크로 미러 어레이 제작)

  • Choi Yong;Lim Jiseok;Kim Seokmin;Sohn Jin-Seung;Kim Hae-Sung;Kang Shinill
    • Transactions of Materials Processing
    • /
    • v.14 no.5 s.77
    • /
    • pp.477-481
    • /
    • 2005
  • Wafer scale micro mirror array with high surface quality for small form factor (SFF) optical pick-up was fabricated by micro UV-molding. To replicate micro mirror array for SFF optical pick-up, a high- precision mold was fabricated using micro-machining technology. Wafer scale micro mirror array was UV-molded using the mold and then the process was optimized experimentally. The surface flatness and roughness of UV-molded micro mirror array were measured by white light scanning interferomety system and analyzed the transcribing characteristics. Finally, the measured flatness of UV-molded micro mirror away for SFF optical pick-up, which was fabricated in the optimum processing condition, was less than 70nm.

THERMOMECHANICAL STUDY OF LASER TREATED NiTi DENTAL ARCH WIRE

  • Kim, Young-Kon;Park, Joon-B.;Lakes, R.S.;Andreasen, G.F.
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1989 no.05
    • /
    • pp.9-12
    • /
    • 1989
  • A preliminary study has been conducted to demonstrate the effect of laser heat treatment on Ni Ti alloy dental arch wires ($0.016"\;{\times}\;0.022"$ and $0.018"\;{\times}\;0.026"$, rectangular shape). Changes in mechanical and thermal properties and surface morphologies are investigated by using optical and scanning electron microscope (SEM), energy dispersive x-ray microprobe analysis(EDX), differential scanning calorimeter (DSC), and micro hardness tester. The results indicate that the laser can affect the thermal equilibrium state of the localized surface. Titanium rich surface film is formed by the laser treatment. The surface film and rapidly resolidified underlying structures show better chemical resistance than the matrix material. Phase transition temperatures which are related to shape recovery temperatures are changed after laser treatment. Hardness of resolidified area and heat affected zone are lower than before treatment.

  • PDF

Fabrication of the photon scanning tunneling microscope with constant intensity mode (일정광량 방식의 광자주사현미경 제작)

  • Kim, Ji-Taek;Choi, Wan-Hae;Jo, Jae-Heung;Chang, Soo;Kim, Dal-Hyun;Koo, Ja-Yong;Chung, Seung-Tae
    • Korean Journal of Optics and Photonics
    • /
    • v.10 no.3
    • /
    • pp.195-200
    • /
    • 1999
  • We made sharp optical fiber tips with less than 100 nm diameter by using the heating and pulling method with a good repetition and fabricated the photon scanning tunneling microscope (PSTM) using constant intensity mode. The 3-dimensional PZT (Piezoelctric transducer) scanner made of a long PZT tube is consisted of three divided parts, that is, a pair of $\pm$ x and a pair of $\pm$y scanning parts and a z scanning part for the fine approach and scanning. The scanning dimension is 1.43 $\mu\textrm{m}$$\times$1.76 $\mu\textrm{m}$. The height of a optical tip to maintain a constant height within $1/{\lambda}_0$ (${\lambda}_0$ is the incident wavelength) from surface of a specimen to a optical tip is controlled automatically by using the electric feedback circuit. The 3-dimensional shape of standing evanescent waves generated on the surface of a dove prism was measured successfully by using the constant intensity mode PSTM.

  • PDF

Confocal Scanning Microscopy : a High-Resolution Nondestructive Surface Profiler

  • Yoo, Hong-Ki;Lee, Seung-Woo;Kang, Dong-Kyun;Kim, Tae-Joong;Gweon, Dae-Gab;Lee, Suk-Won;Kim, Kwang-Soo
    • International Journal of Precision Engineering and Manufacturing
    • /
    • v.7 no.4
    • /
    • pp.3-7
    • /
    • 2006
  • Confocal scanning microscopy is a measurement technique used to observe micrometer and sub-micrometer features due to its high resolution, nondestructive properties, and 3D surface profiling capabilities. The design, implementation, and performance test of a confocal scanning microscopy system are presented in this paper. A short-wavelength laser (405 nm) and an objective lens with a high numerical aperture (0.95) were used to achieve the desired high resolution, while the x- and y-axis scans were implemented using an acousto-optic deflector and galvanomirror, respectively. An objective lens with a piezo-actuator was used to scan the z-axis. A spatial resolution of less than 138 nm was achieved, along with successful 3D surface reconstructions.

Nanotube Shape Variation on the Ti-xNb Alloys with Alloying Elements and Applied Potentials

  • Byeon, In-Seop;Choe, Han-Cheol
    • Proceedings of the Korean Institute of Surface Engineering Conference
    • /
    • 2015.05a
    • /
    • pp.112-112
    • /
    • 2015
  • The purposed of this work was to determine nanotube shape variation on the Ti-xNb alloys with alloying elements and applied potentials. Samples were prepared by arc melting, followed by followed by homogenization for 12 hr at $1000^{\circ}C$ in argon atmosphere. This study was evaluated the phase and microstructure of Ti-xNb alloys using an X-ray diffraction (XRD) and optical microscopy (OM). The morphology of the samples was investigated with a field-emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). The nanotube on the alloy surface was formed in 1 M $H_3PO_4$ with small additions of NaF 0.8 wt.%. All anodization treatments were carried out using a scanning potentiostat (Model 362, EG&G, USA) at constant voltage 30 V for 120 min, respectively. The morphology of the samples was investigated with a field-emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Surface characteristics of nanotbue formed on Ti-xNb alloys was investigated by potentiodynamic test and potentiostatic in 0.9% NaCl solution at $36.5{\pm}1^{\circ}C$. It was observed that the changed ${\alpha}$ phase to ${\beta}$ phase with Nb content.

  • PDF

Analysis of Ceramics Using Scanning Electron Microscopy (주사전자현미경을 활용한 세라믹의 분석)

  • Lee, Sujeong
    • Ceramist
    • /
    • v.22 no.4
    • /
    • pp.368-380
    • /
    • 2019
  • A ceramic is used as a key material in various fields. Accordingly, the use of scanning electron microscopy is increased for the purpose of evaluating the reliability and defects of advanced ceramic materials. The scanning electron microscope is developed to overcome the limitations of optical microscopy and uses accelerated electrons for imaging. Various signals such as SE, BSE and characteristic X-rays provide useful information about the surface microstructure of specimens and, the content and distribution of chemical components. The development of electron guns, such as FEG, and the improved lens system combined with the advanced in-lens detectors and STEM-in-SEM system have expanded the applications of SEM. Automated SEM-EDS analysis also greatly increases the amount of data, enabling more statistically reliable results. In addition, X-ray CT, XRF, and WDS, which are installed in scanning electron microscope, have transformed SEM a more versatile analytical equipment. The performance and specifications of the scanning electron microscope to evaluate ceramics were reviewed and the selection criteria for SEM analysis were described.

Scanning Capacitance Microscope by Stage Driving (스테이지 구동방식 주사형정전용량 현미경)

  • Kim Eung Kyeu
    • Journal of the Korean Institute of Telematics and Electronics B
    • /
    • v.31B no.7
    • /
    • pp.101-107
    • /
    • 1994
  • In this work a scanning capacitance microscopy(SCaM) by stage driving is proposed and presented some of the experimental results.SCaM is a microscope which scans a surface of materials mechanically in two or two point five dimensions by a capacitance probe with a few tenth $\mu\textrm{m}$ ize tip, and display images of the surface shape or capacitive distribution. The present target of the SCaM is 0.1$\mu\textrm{m}$ resolution power which exceeds that of optical microscope. This will become a powerful tool for inspecting ULSI pattern etched by X-ray biological data etc. The experimental system is composed based on a VHD video disk which captures the capacitance changes of the video disk surface and converts it into video signal.

  • PDF

Electro-optical Characterization of Transmission Holographic PDLC with Surfactant

  • Woo, Ju-Yeon;Kim, Eun-Hee;Kim, Byung-Kyu
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.1204-1207
    • /
    • 2004
  • The effects of surfactant on the electro-optic properties of holographic polymer dispersed liquid crystal(HPDLC) have been studied hoping to increase the diffraction efficiency and to reduce the anchoring energy at interfaces. Octanoic acid(OA) was used as sulfactant. The 2,2,2 trifluoroethyl acrylate(TFEA) was added to the monomer mixture to enhance the phase separation and improve optical properties. The morphology of holographic gratings was examined using scanning electron microscopy(SEM). Addition of surfactant was likely to reduce the surface anchoring of the nematic droplet with the polymer surface which favors lowering of the swiching field and to improve the optical qualities.

  • PDF

Surface and Optical Characteristics of Cobalt Dopped-titanium Oxide Film Fabricated by Water Spray Pyrolysis Technique (습식 분무 열분해 방법으로 제조한 코발트 도핑된 티타늄 산화막의 표면 및 광학적 특성)

  • Song Ho-Jun;Park Yeong-Joon
    • Korean Journal of Materials Research
    • /
    • v.15 no.3
    • /
    • pp.209-215
    • /
    • 2005
  • Titanium dioxide films $(TiO_2)$ doped cobalt transition metal were prepared on titanium metal by water spray pyrolysis technique. Micro-morphology, crystalline structure, chemical composition and binding state of sample groups were evaluated using field emission scanning microscope(FE-SEM), X-ray diffractometer(XRD), Raman spectrometer, X-ray photoelectron spectrometer(XPS). $TiO_2$ films of rutile structure were predominately formed on all sample groups and $Ti_2O_3$ oxide was coexisted on the surface of cobalt doped-sample groups. The optical absorption peaks measured by using UV-VIS-NIR spectrophotometer were observed at specific wavelength region in sample groups doped cobalt ion. This result could be analyzed by introducing crystal field theory.

The effects of tetracycline-HCI on SLA implant surface structure (염산 테트라싸이클린이 SLA 임플란트의 표면 구조에 미치는 영향)

  • Sea, Mi-Ran;Kwon, Young-Hyuk;Park, Joon-Bong;Herr, Yeek;Chung, Jong-Hyuk
    • Journal of Periodontal and Implant Science
    • /
    • v.37 no.2
    • /
    • pp.251-263
    • /
    • 2007
  • The present study was performed to evaluate the effects of Tetracycline-HCI on the microstructure change of SLA implant surface according to application time. In the Tetracycline-HCI group, 6 implants were rubbed with sponges soaked $50mg/m{\ell}$ Tetracycline-HCI solution for O.5min., lmin., 1. 5min., 2min., 2.5min. and 3min. In the saline group. another 6 implants conditioned with sponges soaked saline using same methods. One implant wasn't conditioned anything. Then, the changes of surface roughness values were evaluated by optical interferometer & specimens were processed for scanning electron microscopic observation. The results of this study were as follows: 1. In both Tetracycline-HCI group & saline group, there are no significant differences between surface roughness values before & after surface detoxification. And in scanning electron microscopic observation. there are slightly changes of implant surface structures but this changes were not significant by comparison with no treatment implant surface. 2. In the changes of surface roughness values & the scanning electron microscopic observation, there were no significant differences between saline & Tetracycline-HCI groups. In conclusion, the detoxification with $50mg/m{\ell}$ Tetracycline-HCI within 3 minutes can be applied for treatment of peri-implantitis in SLA surface implants. without surface microstructure changes.