用于光纤弱磁场测量的单片机数据采集与处理系统

介绍了基于磁致伸缩原理的光纤弱磁场测量传感器以及为提取被测直流、低频弱磁场信号而设计的单片机数据采集与处理系统,分析了该传感器的各项误差,并给出了实验结果。     

非规则物体位移的测量

在测量非规则物体位移时，研制了一种新型位移传感器－滚动光栅位移传感器。它能在线测量一些特殊的长度量。文章较为详细地对该传感器结构作了介绍，并通过测试和检验证明该传感器能达到较高的测量精度。     

半导体光纤温度传感器特性研究

设计了一种新颖的半导体光纤温度的传感器。通过实验的方法研究了采用不同光源时传感器的输出特性。根据实验数据了分析了传感器的灵敏度、测量范围、线性度和重复性与光源光谱性之间的关系。实验结果表明用该光纤温度传感系统可以实现对温度的非接触稳定测量。     

非规则物体位移的测量

在测量非规则物体位移时，研制了一种新型位移传感器──滚动光栅位移传感器。它能在线测量一些特殊的长度量（如线位移、非圆物体的周长、眼镜镜片的当量直径等）。文章较为详细地对该传感器结构作了介绍，并通过测试和检验证明该传感器能达到较高的测量精度。     

自扫描光电二极管阵列光电信号测量系统及其测试实例的研究

本文介绍了一种利用自扫描光电二极管阵列(SSPDA)图象传感器作为光电转换器件,可用于大面积显示器件图象质量评价和测微领域的测量系统。该系统由光学成象、SSPDA图象传感器、数据采集、接口电路和微型计算机等部分组成,能对各种被测量参数进行处理,并打印出数据和曲线。通过对彩色显象管(CPT)的线宽、三束间距以及光学狭缝等的测试,该系统显示了足够的测量精度。     

叶片叶尖间隙测量的光纤传感器

根据叶尖间隙测量的要求,设计了一种新型的光纤传感器。它采用了单光纤传光、多组光纤束接收散射光的结构。发射光纤位于中心,周围均布多组接收光纤。通过各组接收光纤光强的比值运算,消除了叶尖表面反射率变化对测量结果的影响,也可减小叶尖表面与传感器端面夹角给测量结果带来的影响。在转速同步传感器的配合下,该传感器可以实时测量所有叶片的叶尖间隙。当叶片转速在0—12000r／min之间变化时,叶尖间隙的测量范围为0-3mm,测量精度为25μm。     

一种用于测量弹丸转速的传感器

本文将介绍一种用于测量物体运动转速的传感器，详细地叙述了该传感器的设计和工作原理，给出了可测量范围。     

磁性液体倾角传感器研究

利用永磁体在磁性液体中悬浮的特性,提出了一种新型一维倾角传感器,给出了该传感器的工作原理,设计了传感器样机。采用实验方法测试两个永磁体间磁斥力曲线,并据此确定传感器主要结构参数和特性参数,得到其倾角检测灵敏度表达式。设计了传感器中运动部件的位移的检测电路及转换电路。实验结果表明,当倾角在-18°～18°之间时,输出电压与倾角间成线性关系,其分辨率为0.04°;当倾角在18°～90°（-18°～-90°）之间时,输出电压与倾斜角的关系为非线性关系,且分辨率逐渐降低。该传感器结构简单,无磨损部件,为倾角测量提供了新的途径。     

TCS230传感器在彩色反射密度测量中的应用

介绍了TCS230颜色传感器的特性,结合印刷密度测量的特点,给出了TCS230传感器在彩色反射密度计设计中的使用方法及电路。实验证明,该电路能较好地满足测量需要,实现了彩色反射密度的测量,且在稳定性和精度上达到了设计要求,为TCS230颜色传感器的使用提供了应用实例。     

线阵CCD传感器在材料变形量测试中的应用

阐述了用线阵CCD传感器对材料拉伸变形量进行非接触测试的基本过程。介绍了CCD传感器测量变形量装置的基本原理。给出了采用数字图像处理技术非接触测量变形量的方法,包括图像的预处理,二值化等。该装置结构简单,可对材料进行非接触,无磨损式测量。通过对系统的标定证明了该系统的可靠性。讨论了影响CCD测量精度的各种因素。     

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.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

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.