热辐射型光纤高温传感器及其性能研究

介绍了一种光纤高温传感器及其测温原理和测量方法,研究了传感器的设计结构、稳定性、一致性和互换性等。系统根据黑体热辐射原理,采用双波长比色测温法和光纤传感技术来实现准确测温。结果表明:"接触—非接触"式的测温结构避免了光纤直接接触高温源,传输光功率衰减对传感器测量精度的无影响,传感器具有很好的一致性,完全可以互换使用,也可实现高温高压设备中的温度测量。     

远心镜头在回转体测量系统中的应用

介绍了一种接触测量和非接触测量相结合的回转体测量系统,分析了远心镜头在非接触测量部分的应用。阐述了回转体测量系统的结构和测量方案;讨论了待测回转体的特性参数,指出为了提高测量速度需尽可能采用非接触测量方法;使用远心镜头和平行光源进行了相关实验。结果表明:远心镜头的平行投影能有效地解决回转体工件平面特征成像轮廓线的干扰问题。     

一种非接触高精度的转速测量方法

用霍尔传感器采样速度信号,以及用８０３２单片机进行数据处理和采样时间长度控制,实现用Ｍ／Ｔ法进行一种非接触、高精度的转速测量方法。     

低温环境下超导体微位移测量的研究

在超导精密仪器的研制工作中有时需要测量杜瓦容器内超导体的微小位置变化。由于超导体需运行在极低温环境，运用常规方法难以对超导体的微小位移进行测量。作者选用光纤位移传感器进行非接触测量，研究了光纤位移传感器在室温和液氮温度下的静态传输特性。本项研究为超导体位移、振动的测量提供了一种新的方法。     

一种指针式仪表非接触测量方法

提出了一种基于图像处理技术的指针式仪表非接触测量方法.研究了指针式仪表的圆心、半径、指针角度以及零刻度自动检测与校准的计算,在基于点Hough变换拟合其圆心与半径以及中心投影法确定指针大概位置的基础上,提出了一种基于亚像素定位的拟合指针直线的方法,具有指针式仪表高精度的自动检测与定位,从而实现了指针式仪表非接触测量.实验表明,该方法具有快速、准确等特点且切实可行.     

一种激光路面平整度仪系统的设计

为了克服现有路面平整度仪的不足，提出了一种新型的路面平整度仪系统。采用CCD器件和激光非接触测量方法，利用上位机(笔记本电脑)和下位机(激光路面平整度仪)相结合的方式，实现了对路程、车速、国际平整度指数(IRI)等的采样、计算和分析处理。实际运行证明该系统具有精度高、误差小、成本低等优点。     

提升容器横向偏移惯性测量法的误差分析与校正

针对超深矿井提升装备需要增加提升容器横向偏移测量的问题,根据其小量程、高精度、抗干扰的测量要求,提出一种基于MEMS传感器的惯性测量方法.采用惯性测距原理进行横向偏移测量,分析了倾斜角、随机误差和速度残值三种主要误差源,提出了对应的动态均值、阈值设置和速度残值校正与补偿三种校正方法,结合提升容器的运行特点消除累积误差,并在液压移动平台上进行实验.结果表明:误差校正方法可有效抑制误差,横移测量精度在5 mm以内,惯性测量方法是一种超深矿井提升容器横向偏移测量的有效方法.     

接触式光电温度传感器

介绍一种以黑体辐射理论为基础的HXW新型高温传感器，该传感器是由探测管和探测器两部分组成，兼有接触式和非接触式测温两类方法的长处。测量方法是用耐高温和耐侵蚀的材料制成人工黑体与被测对象接触，加热至被测温度，用光电探测器接收亮度信号，可用来测量各类高温炉和熔液内部的实际温度。     

轴瓦值的计算机辅助无接触测量

针对轴瓦检验中实际问题，介绍了一种轴瓦过盈值无接触测量方法，并阐述了计算机数据采集，数据处理，人机界面，误差处理等相关软件设计问题。     

一种基于Canny算子的非接触测量方法分析

本文提出了一种基于Canny算子的尺寸测量方法,利用计算机视觉代替人眼对被测工件参数进行非接触测量,在VisualC++6.0平台上开发了一种测量软件系统,实现了测量自动化。通过多次实验进行验证,结果表明,这种方法克服了传统人工测量所造成的各种误差,测量精度达到了0.003mm,大大提高了测量的准确性和效率。     

Research into tritium and helium-3 contents distributions in steel wall of spherical pressure vessel

The tritium quantity stored in a steel pressure vessel decreases with time because of helium-3 decay and permeation of tritium into the steel wall of the pressure vessel.Meanwhile,the tritium quantity permeating into the steel wall also decreases with time due to helium-3 decay and diffusion in and out of the wall of tritium.Tritium and helium-3 in the steel wall will cause hydrogen and helium embrittlement of the wall material,respectively,and thereby change the carrying capacity of the vessel.Taking conte...     

胎压检测系统中的非接触电能传输技术

传统电能传输主要通过导线直接接触,在一般情况下该方法合理有效;胎压检测系统通常由检测模块和中央模块构成;其中,检测模块被置于轮胎内部,实现压力的检测和数据的传输;因此,在隔离并且高速旋转的情况下,传统电能传输方式有很大的局限性;非接触电能传输系统由能量变换和发送回路和能量接收回路组成,利用电磁感应与耦合原理实现能量传输;本文根据非接触电能传输原理,设计了一种基于可旋转变压器的非接触电能传输装置,实现了对检测模块的供电和电能的无接触传输。     

Optical contactless probing: an all-silicon, fully optical approach

With decreasing feature size and increasing chip densities, the classical mechanical probe approach for internal fault detection and functional testing faces increasing challenges. Contactless testing might resolve many of the challenges associated with conventional mechanical wafer testing. This article reviews and explains existing optical contactless technologies and introduces a new test methodology - a fully optical contactless testing technique. The proposed method's uniqueness lies in the fact that it is a fully optical technique that uses visible light and is completely compatible with standard silicon IC processing. The technique produces results that demonstrate its feasibility and show its advantages over other optical contactless testing methods.     

非接触IC卡读卡器的开发研究

随着高校招生规模的不断扩大,各学校原有的消费和管理模式已不能适应新的发展要求,先进的校园一卡通系统的出现带来了管理工作的革命。论文介绍了校园一卡通的组成和应用,对非接触IC卡、串口通信、多线程等技术进行了研究,提出了使用多线程、串口等技术开发基于PC控制的非接触IC卡读卡器系统作为校园一卡通系统的一个重要子系统,建立非接触IC卡子系统模型,并给出了程序的测试结果。     

感应式非接触角度传感器电磁耦合系统设计

感应式非接触角度传感器性能优良,日益得到广泛应用,其在植入式医疗器件状态监测领域的应用前景尤被看好.对作为感应式非接触角度传感器基础的电磁耦合系统进行设计研究.详细分析了感应式非接触角度传感器的基本测量原理,并基于该原理使用电磁场有限元分析软件Ansoft Maxwell 3D对其电磁耦合系统进行了仿真设计并制作了样机...     

Microstructure based two-scale modelling of soft tissues

A technique suitable for the modelling of large deforming biological tissues with a nearly periodic microstructure is presented in this work. The proposed approach takes into account the heterogeneous material constitution and geometrical arrangement of the tissues at the microstructural level. The global material properties are described in terms of the homogenized (effective) parameters. Numerical simulations are focused on the mechanical behaviour of an arterial wall.     

Prediction of thermoplastic failure of a reactor pressure vessel under a postulated core melt accident

This paper presents the lower-head failure calculations performed for a postulated accident scenario in a commercial nuclear power plant. A postulated 1 inch break in the primary coolant circuit leads to dry-out and subsequent meltdown of the core. The reference plant is a pressurized-water reactor without penetrations in the reactor vessel lower head. The molten core material accumulates in the lower head, eventually causing failure of the vessel. The analysis investigates flow conditions in the melt pool, temperature evolution in the reactor vessel wall and structure mechanical evaluation of the vessel under strong thermal loads and a range of internal pressures. The calculations were performed using the ADINA finite-element codes. The analysis focusses on the failure processes, and time and mode of failure. The most likely mode of failure at low pressure is global rupture due to gradual accumulation of creep strain over a large part of the heated area. In contrast, thermoplasticity becomes important at high pressure or following a pressure spike and can lead to earlier local failure. In situations in which part of the heat load is concentrated over a small area, resulting in a hot spot, local failure occurs, but not until the temperatures are close to the melting point. At low pressure in particular, the hot spot area remains intact until the structure is molten across more than half of the thickness.     

γ射线工业物位计在线标定方法

同位素核辐射测量仪表是基于被测介质对射线的吸收、反散射或射线对介质的电离激发作用的特性而设计的.核辐射物位计在聚酯化工、冶金、制药等行业的反应釜非接触式测量中得到了广泛应用.分析表明:只有熟练地掌握核辐射测量仪表的原理及正确地标定核辐射物位计,才能确保整个生产工艺流程的合理性和产品最终的质量等级.     

一种无接触供电的无线鼠标

介绍了一种无接触供电的无线鼠标设计电路,无接触电能发射装置采用USB供电,通过自激振荡电路产生了138 kHz的高频振荡电压;无接触电能接收装置采用感应耦合方式获取电能.无线鼠标用无线模块nRF24E1构成信号发射和接收电路,该电路除具备有线鼠标全部功能外,还可以离开电脑远距离灵活操纵鼠标.     

Polyurethane rubber all-polymer artificial hair cell sensor

In this paper, we present the design, fabrication process, and preliminary testing results of an artificial hair cell (AHC) sensor made entirely of polymer materials from the substrate level up. The new AHC sensor utilizes polyurethane elastomers for sensing and structures. The AHC can detect two-axis deflection of a vertical polyurethane hair using carbon-impregnated polyurethane force sensitive resistors (FSRs). AHC with cylindrical hair cross-section exhibit sensitivity of 245 ppm resistance change for every micron (ppm//spl mu/m) of tip deflection. The AHC threshold detection level of 3 /spl mu/m compares favorably with insect tactile hair cells having thresholds on the order of 30-50 /spl mu/m. Furthermore, we have characterized the mechanical and chemical properties of two-part room-temperature-curing polyurethane elastomers in the context of microfabrication. Elastic properties, chemical resistance, thermal oxidative decomposition, and adhesion properties are tested and compared to the performance of polydimethylsiloxane (PDMS), a widely used elastomeric material. Polyurethane elastomer exhibit superior mechanical tear resistance and ability to adhere to substrates compared to PDMS.