图象式自动瞄准系统的研究

光学仪器瞄准的自动化和智能化一直是现代仪器设计中的关键问题,提出一种新的图像式自动瞄准系统,它采用“电子准星”技术和亚旬素细分技术实现了被测零件轮廓的自动瞄准。该系统已成功地应用在万能工具显微镜图像化和升级改造中,可将万能工具显微镜测量精度提高一个数量级,同时扩展了原有功能。该方法还可用于各类光学仪器的自动瞄准和测量。     

视频分划的自动瞄准技术与应用研究

基于光学分划原理提出了视频分划技术,在此基础上提出了新的自动瞄准技术,并详述了视频分划技术中视频竖线、横线和十字线的生成技术,分析讨论了视频分划技术用于自动瞄准的实现原理及瞄准的精度,还将该技术应用于高速、高精度钢卷尺自动瞄准切零位系统中,取得了显著的成效.基于其具有的超越光学分划技术的优越性能,视频分划技术在自动瞄准、自动测量、自动识别及自动存储等多种实际工程应用中都有广阔的应用前景.     

光学仪器的新技术——光电化图像测量系统

文章阐述了光电化图像测量系统是光学计量仪器的高新技术。重点介绍图像式瞄准系统、自动调焦系统的构成及工作原理。     

显微标尺测量系统的研制

本文介绍了应用TWAIN接口CCD为光电接收器来实现对刻线自动瞄准的简易型显微标尺测量系统 ,配合高分辨力的激光干涉仪和实时图像采集处理系统 ,具有结构简单、成本低、测量准确度高的优点。文中提出三种不同的刻线自动瞄准算法 ,确保系统测量软件的刻线自动瞄准的实现     

光学仪器的新技术--光电化图像测量系统

文章阐述了光电化图像测量系统是光学计量仪器的高新技术。重点介绍图像式瞄准系统、自动调焦系统的构成及工作原理。     

多功能图像法轮廓自动瞄准技术的研究

本文介绍通过电荷耦合器件（ＣＣＤ）和计算机图像处理技术实现对轮廓的自动瞄准和对小尺寸试件直接测量。该技术对直线轮廓的瞄准精度达到０．２５μｍ；对刻线的瞄准精度达到０．０６９μｍ。     

在万工显上测量凸轮样板的找正方法

万能工具显微镜(以下简称万工显)以影相法和轴切法，可按直角坐标和极坐标精确地测量零件的长度和角度，并可测量零件的形状，采集数据主要靠瞄准装置和读数系统，不同的工件选用不同的方法。本文介绍一种影象法并以极坐标采集数据测量凸轮样板的找正方法。     

规则目标边缘的自动瞄准方法研究

瞄准系统是视觉检测系统的重要组成部分。为了实现对规则目标的自动瞄准,提出一种基于曲线拟合方法的“电子准星”技术,实现规则目标边缘的自动瞄准。实际测试表明,该瞄准方法的重复定位精度可达1/10像素。     

2m比长仪纳米级精度线间距测量系统的研究

介绍了2 m比长仪系统的组成,对其采用光电显微镜动态瞄准刻线和激光干涉测长原理进行了分析,研究了提高刻线瞄准精度和激光干涉测长精度的方法及利用现代电子技术实现刻线信号和干涉信号自动同步快速处理方法。自动信号处理系统基于FPGA现场可编程电路技术和计算机技术。通过对金属线纹尺测量的实验表明,依据JJG 331—1994激光干涉比长仪检定规程进行实验,2 m比长仪单次最佳刻线瞄准精度优于10 nm(1σ),对其测量的不确定度分析表明,对于测量高质量的高等别线纹尺,其测量不确定度U=（20+40 L）nm（k=2）。     

专用瞄准设备自动检定系统

介绍了专用瞄准设备自动检定系统的系统配置、工作原理及软件设计,并对系统的测量不确定度进行了分析和评定。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to