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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Uncertainty Estimation in Intelligent Coordinate and Profile Measurement

    Kiyoshi TakamasuSatoru TakahashiXin Chen
    P.564-568页
    查看更多>>摘要：The uncertainty estimation of coordinate and profile measurement is essential for accurate measurement and establishment of traceability. We proposed an uncertainty propagation method to estimate the uncertainty of coordinate and profile measurement. In this article, the multi sensor algorithm with uncertainty estimation method is described for the profile measurement. Additionally, two examples of multi sensor method are introduced. According to the simulation results of assessing uncertainty and the experimental results, the validity of the method was confirmed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Quality Control Method Based on Gear Tooth Contact Evaluation Using Near-Infrared Ray Imagery

    Masaki NAGATAToshiki HIROGAKIEiichi AOYAMATakahiro IIDA...
    P.569-573页
    查看更多>>摘要：Conventionally, tooth contact evaluation has been performed visually by machine operators in gear manufacturing fields when finishing a gear or during assembly. With automation, the contact area's boundary is unclear due to scattered light when visible light is used to obtain an image for tooth contact evaluation. We therefore focused on using near-infrared to prevent scattered light. First, we confirmed that the tooth contact image obtained by image binarization is hardly affected by the image threshold. Second, we propose a new method to extract the boundary part of the tooth contact by differential calculation of the fine near-infrared image. These methods allow automatic division of near-infrared images into the contact area, the boundary, and the non-contact area. Finally, the obtained result is compared with the tooth contact calculated from the measured tooth surface. We demonstrated that the near-infrared image method is effective for automatic tooth contact evaluation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Plasmonic Lens for Nanometrology

    Jun WANGWei ZHOU
    P.574-578页
    查看更多>>摘要：In this paper, we presented plasmonic lens using metallic nanostructures to manipulate light based on surface plasmon polaritons for subwavelength focusing and collimation. We then proposed the use of plasmonic lens in the field of nanophotonics as a micro-photonic-device for nanometrology and sensing/detection purposes.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Novel High-Resolution Optical Displacement Encoder Design Based on Double-Concave Lens

    Yi-Hua FanYing-Tsun LeeChun-yu ChenYi-Lin Liao...
    P.579-583页
    查看更多>>摘要：A novel optical displacement encoder was proposed in this paper. An optical mechanism was designed by the equations of thick lens to change and modify the paths of light, and then to get a more visible position change in the optical detector to improve the measurement accuracy. The simulation results indicated that the optical mechanism with 5 mm stroke, which the lens radii of curvature of the incident and the exit surface on the lens were -0.625 cm and 1.25 cm, respectively, and the magnification was 50 times in imaging distance of 38 cm, could make the 1 nm movement intervals of light source to be about 50 nm movement intervals in the detecting surface. Thus we can combine the optical mechanism and a photo-detector array with 50 nm resolution and 25 cm total detecting length to form the optical displacement encoder with 1 nm measuring accuracy.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optical Sensing Based on Localized Surface Plasmon Resonance

    Shaoli ZhuWei Zhou
    P.584-589页
    查看更多>>摘要：Localized surface plasmon resonance (LSPR)-based nano-biosensors are of great interest in various applications such as environmental protection, biotechnology, and food safety. It is well known that types of materials and shapes of the nanostructures have significant influence on the sensitivity and the resolution in nanobiosensor application field. The conventional nanostructure array used for nanobiosensor is fabricated by chemical method, so it is difficult to control the shape and the inter-particle space. Focused ion beam (FIB) can be used to produce any shapes with a very high level of regularity and reproducibility. This makes it possible to optimize the shape of nanostructures and the inter-particle distance to achieve the full potential application in nanobiosensor. Using focused ion beam (FIB) nanofabrication method, we have fabricated the regularly shaped hybrid Ag-Au nanostructures distributed on the surface of the glass substrate. Gold-coating was used to tuning the optical characteristics of the silver nanostructure array. Discrete dipole approximation (DDA) method was used to optimize geometrical parameters of the hybrid Ag-Au nanostructures. The design and experiment results show that the sensitivity and resolution have been improved considerably compared to the chemically synthesized nanostructures. The nano-biosensor demonstrates the potential applications in monitoring, detection and identification of biological agents, and characterization of intermolecular interactions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Multi-probe Measurement Method to Evaluate the Yaw and Straightness Errors of XY Stage on High Precision CMM

    Ping YangShusaku ShibataSatoru TakahashiKiyoshi Takamasu...
    P.590-594页
    查看更多>>摘要：To develop a high precision Micro Coordinate Measuring Machine (Micro-CMM), it is important to evaluate an X-Y stage on the Micro-CMM. A precision multi-probe measurement system has been designed and developed for simultaneously measuring the yaw and straightness errors of the X-Y stage. In the system, an autocollimator measures the yaw error of the stage, and two laser interferometers measure the profile of a standard mirror which is fixed on the X-Y stage. The straightness error is reconstructed by the application of simultaneous equation and least-squares methods, and the uncertainty associated with the multi-probe method is simulated. When the interval of the laser interferometers equals 10 mm, the standard deviation of multi-probe method using the high accuracy autocollimator and the laser interferometers is about 10 nm. The simulation results satisfy our purpose for the uncertainty of 50 nm, and practical considerations are discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Development of In-Process Evaluation for Microlens Mold Using Angle Resolved Scattering System

    TERUTAKE HayashiYUKI NakatsukaYASUHIRO Takaya
    P.595-598页
    查看更多>>摘要：If the surface of a lens injection mold contains defects, the conditions of its surface coating worsen with each injection in the lens production process. Hence, an on-machine quantitative evaluation method is required for the lens mold surface. With the aim of characterizing the mold surface texture in this study, we have developed an automated light-scattering measurement system that enables 3D detection of scattered light in various directions due to the flaws and roughness of the mold surface.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Video-Based Interferogram Analysis for Measuring Influence of Vibration to White Light Interferometry

    Wee Keat ChongXiang LiSardha Wijesoma
    P.599-603页
    查看更多>>摘要：In this paper, we present a video-based interferogram analysis method for measuring the influence of vibration on white light interferometer in terms of undesired change in optical path difference between reference and sample arms. The measurement principle is based on the analysis of interferograms which involves tracking and converting change in interferograms to physical change in optical path difference. The method proposed uses the original sensor in interferometer for data acquisition as such no additional hardware is required. Such an approach ensures that the properties of interferometer such as the bandwidth of sensor are considered and the vibration pattern recorded is close to the effective influence of vibration. With our method, the influence of vibration on white light interferometer and the performance of vibration isolation system can be objectively quantified and measured.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Profile Measurement of Large Aspheric Optical Surface by Scanning Deflectometry with Rotatable Optical Devices: Error Analysis and Pre-experiment

    Muzheng XiaoSatomi JujoSatoru TakahashiKiyoshi Takamasu...
    P.604-608页
    查看更多>>摘要：Large aspheric mirrors with diameter over 300 millimeters with high surface accuracy are wildly used in many areas such as astronomical telescopes. Interferometers are widely used in profile measurement of optical flat and sphere. However, standard reference aspheric surface which is necessary for this method is difficult to make. Scanning defletometry based on ESAD (Extended Shear Angle Difference) is used to measure ultra-precise large near-flat and slight curved optical surface with the accuracy of sub-nanometer. However, it is not possible for it to measure aspheric surface because of the limitation of the measuring range of autocollimators. We proposed a new measuring method to scan the surface of a large aspheric optical surface using autocollimator with rotatable optical devices fixed on linear motion stage. To eliminate the influence of the pitching error of the scanning stage, we use two mirrors reflecting laser comes from autocollimator, which have the same effect with a pentaprism used in ESAD. To enlarge the measuring range of the autocollimator, we use a rotatable mirror to fit the changes of the slope of the mirror surface under measurement. The error analysis of the method is done. Measurement of an optical flat mirror and a sphere mirror with diameter of 50 mm and biggest slope of 6000 arc-second are done. The rotatable optical devices that we designed are proved effective on eliminating the pitching error of the moving stage.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Laser-Pointer Rangefinder between Mobile Robot and Obstacles via Webcam Based

    Shahed ShojaeipourBehrang ParhizkarAmirhossein HosseinmemarAli Shojaeipour...
    P.609-613页
    查看更多>>摘要：In this paper, we present a method to measurement a distance using a laser-pointer. This method calculated the distance from obstacles for the robot to transverse to its target location, while avoiding obstacles along the way. The environment is first captured as an image using a webcam. Image processing are then calculate to identify the existence of obstacles within the environment. Using the laser-pointer, ditance locations with obstacles are identified which laser-pointer consist of the webcam and the laser-pointer. It measure the distace mobile robot to the obstacles is identified. The program is written in MATLAB with the Image processing toolbox.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd