录像机无调整式数字伺服

本文介绍了用一个专用微处理器实现新型无调整式数字伺服系统,并在此基础上提出了一种新的磁鼓电机控制方法。     

高性能小型扫描器

本文讨论了一种高性能小型扫描器的基本原理及扫描时序变换。对采用该小型扫描器的热成像系统也作了详细的介绍。该小型扫描器可满足多种用途。     

DIGITAL PROCESSING OF THE POLARIZATION STATE OF GEOPHYSICAL ULF SIGNALS

In this paper, the evaluation by running window smoothing is used for the digital processing of the polarization of geophysical ULF signals. The observed signals are resolved into two orthogonal complex components so that it is no longer necessary to consider the phase and amplitude of the signals simultaneously.     

基于数字图像分析的薄板成形应变场测量方法

对薄板成形应变场传统的测量方法进行了研究。指出了其不足和误差的来源，提出了数字图像分析法测量薄板成形中的应变场，对测量原理，新的测量方法对传统方法的改进，以及如何降低误差进行了介绍，指出数字图像分析法的前景，提出了改进意见。     

中频数字化及数字式正交解调

本文介绍用数字式下变频法实现中频正交解调的基本原理及主要性能。     

Estimation of true dihedral angles and relative grain boundary energies in polycrystals using the disector

Relative grain boundary energies can be simply related to true dihedral angles, which are the angles between grain boundary planes meeting at triple edges in polycrystals. Some limited efforts in the measurement of true dihedral angles have used the technique of serial sectioning, which is usually cumbersome and time consuming. In this study the three‐dimensional probe called the ‘disector’ has been employed to evaluate true dihedral angles. This probe, combined with automated image processing, introduces precision as well as efficiency, overcomes the disadvantages of the two‐dimensional probe and is far less tedious and less complicated than serial sectioning. It is shown that the technique is relatively simple and therefore can be applied to obtain a significantly large and accurate statistical sample of true dihedral angles. The application of this method is demonstrated by evaluating the triple junction geometry and the associated relative grain boundary energies in polycrystalline 316L austenitic stainless steel.     

A new ‘tailor-made’ methodology for the mechanical behaviour analysis of rubber-like materials: I. Kinematics measurements using a digital speckle extensometry

This paper is the first part of a work devoted to the setting-up of a methodology for the mechanical behaviour characterization of rubber-like materials, using a digital speckle extensometer. We present here the experimental approach, specific to large strain measurements. The proposed method is based on in-plane kinematics measurements using an optical extensometer. The whole two-dimensional field of in-plane displacements is obtained by a digital image processing. We discuss then the correlation calculations and how to achieve the optimal subset matching. Next, we specify how to derive the principal stretch ratios, and the accuracy on these components, issued from a subsequent numerical calibration.Finally, we present experimental data dealing with a carbon black, filled natural rubber, issued from uniaxial traction tests, pure shear tests, and tensile tests performed on double-edge notched tensile specimens.     

高精细数字会聚校正系统

数字会聚校正使1%的会聚精度提高到0.1%以上。本文叙述了数字会聚校正系统的设计要求,工作原理以及设计计算,给出了在投影电视上的试验结果,最后,指出了今后发展的方向。     

自动实时X射线检测技术在半导体制程控制中的应用

对X光检测的不同技术在半导体制程上的应用作了详细的介绍;着重讨论了全旋倾斜(off-axis)X射线技术的特点和优势。     

SDI接口数字监视设备的设计与实现

介绍了一种对SDV(串行数字视频)信号进行解码的设备设计方案，提出了该系统的总体构架，并对该系统的硬件设计、软件设计进行了全面的论述。设计的产品具有较高的性能价格比，已进入了推广阶段。