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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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    High Precision Angular and Linear Measurements Using Universal Opto-Electronic Measuring Modules in Distributed Measuring Systems

    Igor A. KonyakhinAlexander N. TimofeevSergey N. Yaryshev
    P.160-164页
    查看更多>>摘要：Large or long objects require measuring systems as a combination of more than one measuring instrument. In this case, the combination of instruments consists of one central module and several measuring modules. The measuring modules make the preliminary computation of measuring information and translate it to the central module for final computation of measuring parameters. The central module also makes statistics of measuring and archive information. Some tasks require noncontact measurement of angular and linear coordinates of objects or places. The optoelectronic measuring devices (0EMD) are ideal for these purposes. These devices also have other advantages such as high precision and adaptability. One and two coordinates high precision modules based on matrix and linear CCD or CMOS photo sensors are described. In this article variants of the distributed measuring systems are described. The basic attention is given to the description of the unified optoelectronic modules for measurement of angular and linear coordinates. Basic parameters and application examples of measuring modules are presented.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    High Productive Optoelectronic Pellets Surface Inspection for Nuclear Reactors

    Alexey V. BeloborodovEvgeny V. VlasovLeonid V. FinogenovPeter S. Zav'yalov...
    P.165-169页
    查看更多>>摘要：The results of development and investigation of computer-vision systems for inspection of the external view of fuel pellets for nuclear fuel elements are presented. The systems developed utilize CCD-cameras to record the images of a fuel pellet's external view in reflected beams that ensures high contrast of the defects in the picture area. One has developed a database containing images of simulators, as well as real pellets. Tests of an experimental set for fuel pellet inspection have demonstrated its inspection productivity to be 1 pellet per second and its detection probability higher than 95%. The research team has also developed an experimental set with higher inspection productivity (at least 7 pellets per second).
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    High Throughput System for Geometry Inspection of Large-Size Distributed Objects

    Sergei N. MakarovAlexander G. Verkhogliad
    P.170-173页
    查看更多>>摘要：The article presents a measurement system designed for "on-line" high throughput simultaneous optical inspection of large set of geometrical parameters (more than 1000 points) defining geometry of some complex surface. The measurement system is based on the distributed network of optical distance sensors. Specialized optical sensor as basic system element was developed for this purpose. Among its features are the following: non-contact measurement, high optical and electromagnetic noise immunity, small footprint, and mass-production oriented. The system allows us to measure up to 1700 linear distance parameters simultaneously in the range of 40mm, with accuracy (3σ) of 0.1 mm and sampling rate of at least 10~3 Hz.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Touch-Trigger Measurement of Micro-Cavity by Optical Fiber Coupling

    Cui JiwenSong ChuanxiTan Jiubin
    P.174-178页
    查看更多>>摘要：In order to measure the geometric dimension of a micro-cavity, a touch-trigger measurement method is proposed, in which the light coming from the incident optical fiber is transmitted in the reversal direction via the optical fiber coupling into the effluent optical fiber, the lateral displacement of the touch-trigger sensor is transformed into the deflexion of light coming out from the effluent optical fiber, and the deflexion is transformed into an image signal by the object lens and CCD capturing system. The effectiveness of the proposed method is verified by experiments. Experimental results indicate that the proposed method can be used to measure the geometric dimension of a micro-cavity. A blind hole of 1.5 mm deep and about 0.2 mm in diameter is measured with the touch-trigger sensor and self-developed micro-hole diameter measuring machine with a repeatability uncertainty of less than 0.2 μm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Method for Laser Measurement of Disperse Composition and Concentration of Aerosol Particles

    Olga B. KudryashovaIgor R. AkhmadeevAnatoly A. PavlenkoVladimir A. Arkhipov...
    P.179-183页
    查看更多>>摘要：A modified method of small-angle scattering that consists in solving a series of direct problems in aerosol optics is proposed to obtain a function of particle size distibution; a modified method of spectral transperancy is employed to determine the concentration of particles in a cloud. A measurement system comprising radiator (helium-neon laser), photodetector and recording instruments has been developed. Measurements in aerosol clouds are performed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Novel Point Matching Method for Stereovision Measurement Using RANSAC Affine Transformation

    Naiguang LuPeng SunWenyi DengLianqing Zhu...
    P.184-188页
    查看更多>>摘要：A binocular point matching method using affine transformation is presented in this paper to deal with matching ambiguities. The epipolar geometry is used to determine all the possible matching pairs to form an initial correspondence data set. Then, an affine registration model with four parameters that is invariant to scaling, rotation and translation is built using the Random Sample Consensus (RANSAC) method to describe the coordinate transformation between the two members of correspondences. Finally, correspondences are picked out using minimal nearest neighbor distances based on the geometric similarity between the right image points and the transformed left ones. The proposed method is applied to measure the profile of a 3.5m parabolic reflector of an inflatable antenna and proved to be able to handle the extra or missing point matching problems coursed by occlusion and sheltering. Satisfactory results are obtained with high correct rate for matching most image pairs despite the significantly different viewpoints, which indicates its validity and application feasibility in automatic stereovision measurement field.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Impact of High-Speed Image Recognition of Transition Phenomenon of Chip Formation and Chip Flow in Gear Hobbing Process

    Yoji UmezakiSyuhei KurokawaYasutsune Ariura
    P.189-193页
    查看更多>>摘要：The transient phenomenon of chip generations and behavior in the gear hobbing process are investigated by using a high-speed video camera. The chip behavior generated in gear finish hobbing process is very complicated and one can not identify each chip from specified cutting edges. The authors have built up a new simulation method of the hobbing process using a flying tool and a special-shaped workpiece, which consists of one tooth space. Visual evidences of the chip interference on the rake face and some conditions of contact between generated chips and the work surface were visually obtained. In the case of dry cutting conditon with a high-speed steel (HSS) flytool without coating on the rake face, the flytool cuts the workpiece frequently with the stuck chip generated in the previous revolution on the rake face. The newly generated chip pushes out the previous stuck chip, which flies away eventually. The chip flow on the rake face interferes strongly at the corner of the cutting edge when both top and side cutting edges produce different chips at the same time, and the chips flow out in changing the shape. The moving speed of the chip was also measured.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Measurement of Straightness for Two-Dimensional Translatory Stage

    Ryoshu FurutaniMasakazu Watanabe
    P.194-197页
    查看更多>>摘要：The large scaled and high accurate 2D-stage is necessary for nanomanufacturing. In order to measure the position of stage, two direction sensors are used. These sensors measure the displacement from the metrological frame. However in nanometer application, as the profile error of metrological frame is comparable with the accuracy of 2D-stage, it is not negligible. Therefore the measuring result includes the displacement of stages and the profile error of metrological frame. So the multi-probe method is applied in one-dimensional measurement to separate the displacement error from the profile error of the metrological frame. In the multi-probe method, the zero adjustment error cannot be removed. So this article proposes a new method which separates the displacement of 2D-stage from the profile errors of the metrological frames in two directions. In this article, as the laser interferometer is used as the sensor, the measuring data is assumed as the shape of the axis of stages mixed with the profile error of the reference mirror in laser interferometer. The relationship during the measuring data, the shape of the axis and the profile error is described. The shape of axis of stage and the profile error of mirror are derived from the measuring result in experiment.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Accuracy Enhancement for Precision Angle Measuring Structures

    Alexey V. Kiryanov
    P.198-202页
    查看更多>>摘要：Producing high-quality optical limbs, circular scales, rasters, multibit code disks (key metrological elements hereinafter called "angle measuring structures" (AMS) is an important engineering problem for any manufacturer, making angle measuring gauges. The analysis of the precision parameters of the AMS that were made by the method of circular scanning has revealed that the distorted circular trajectory of the recording laser beam moving across the surface of a semimanufactured article to be the main source of errors in the AMS produced. The main reason causing the distortion has been the rotor imbalance in the spindle unit of the laser generator of images. The article offers solutions for accuracy enhancement in manufacturing precision angle measuring structures. It also describes error estimation process in the raster, manufactured upon implementing the solutions offered.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optic-Electronic Systems for Control the Angle and Line Positions of the Elements Unblocked Aperture Radio-Telescope

    Igor A. KonyakhinAlexander N. Timofeev
    P.203-207页
    查看更多>>摘要：The construction of new radio telescope RT-70 Suffa requires controlling the angular and linear deformation of the mirror elements. Following issues dealing with this problem are described in this article: 1) the possibility of the design of deformation measurement system based on triangular method 2) the new scheme of optic-electronic measurement system. The great attention during the research was paid to the experimental approval of the theoretical results. The computer simulation error and the experimental error measurement was 0.08 mm at the range 30 mm on a working distance of 25 m, which allows measuring the deformation of radiotelescope construction with the mirror diameter 70 m.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd