热释电系数自动测试系统的研究

介绍了铁电薄膜材料热释电系数的测量原理和电路,着重设计了PA级前置放大电路,并对PLT铁电薄膜样品进行了测试。     

一种高灵敏度自主采样式热释电传感器的研究

为了提高热释电型红外传感器的探测距离和提高其探测灵敏度，本文提出了一种具有高灵敏性的热释电红外传感器的基本设计方法。这种热释电红外传感器采用正弦波电流发生器和电磁线圈产生电磁力驱动凸透镜进行微幅摆动。被检测的热释电红外信号经过滤光镜片和摆动的凸透镜聚焦后，其红外光焦点同样也进行微幅摆动。这样，安装在红外光焦点运动轨迹上的热释电敏感元件被红外光焦点不断扫描而产生自主采样的热释电信号。由于凸透镜的受光面积较大，被聚焦的红外光线较多，因此提高了热释电红外传感器的检测灵敏度。一般来说，对同样的热释电敏感元件，采用自主采样式热释电红外传感器的探测距离可以达到菲涅尔透镜式的3倍以上。     

电调制非分光红外(NDIR)气体传感器

介绍一种采用电调制红外光源的新型非分光红外气体传感器。该传感器通过采用电调制红外光源，节省了传统方法中的机械调制部件；同时采用高精度干涉滤光片一体化热释电红外传感器及单光束双波长技术，配合易拆卸的镀金气室及ADuC812数据采集系统，可以实现SO2、NO、CO2、CO、CH4等气体的实时测量。     

热释电红外传感器及其典型应用

介绍了热释电红外传感器的结构、工作原理,给出了热释电红外传感器的两种典型应用电路——红外报警电路和洗手间自动出水系统电路,分析了电路功能和原理。     

热释电型红外传感器原理及应用

热释电型红外传感器原理及应用沈阳大学计算机工程系（１１００４４）范立南钛酸钡等热电材料，若其表面的温度上升或下降，则该表面产生电荷，这种效应称热释电效应。热释电型传感器利用热释电效应来检测受光面的温度升高值，且工作在红外波段内。这种传感器在遥感技术、...     

铁电存储器薄膜的计算机模拟

随着信息技术的迅速发展,对信息存储器提出了以下要求高密度、高读写速度、低功耗和尽可能长的存储寿命.铁电薄膜材料在存储技术中的应用出现为这一切提供了可能.本文在分析铁电材料自发极化机制的基础上,建立了铁电薄膜的微观极化模型,通过计算铁电系统中的能量和有效电场,根据铁电极化的运动方程,模拟出铁电薄膜的电滞回线,为铁电薄膜材料的信息存储提供理论指导.     

基于人体步态识别的热释电红外传感报警系统

针对热释电红外传感器对运动后静止的人体无法感应的缺点,设计了一种基于人体步态识别的热释电红外报警系统,大大提高了系统感知智能度,减少了报警的误报率.该系统利用热释电红外传感器(PIR)作为探头,将感测到人体的红外信息转换成电压信号,通过滤波、放大等信号调理以及经过数据采集后,将信号传递给单片机处理,结合人体运动特征进行...     

热释电红外报警系统设计

基于热释电红外传感器的工作原理,设计了一种被动式热释电红外报警器。主要用于家居安全,探测有无外人闯入。该系统由热释电红外传感器、菲涅尔透镜和监控电路组成。系统把红外线的隐蔽性很好地应用于电路中,选用了新一代红外信号处理器BISS0001,设计了放大滤波电路,红外信号处理电路,并加入语音芯片,模拟警笛声音,达到防盗目的。经多次实验,该系统反应灵敏,抗干扰能力强,安全可靠。     

基于热释电传感器的人体移动检测系统的设计

文章主要介绍了红外传感器的一种——热释电传感器的工作原理，简单阐述了基于热释电传感器p7187的人体移动探测器系统的工作原理，讨论了该系统的设计与实现方法。     

热释电红外传感器的原理和应用

介绍热释电红外传感器的工作原理.并且设计了基于热释电红外传感器的控制电路,可实现不接触感应控制,增加了执行时间,光照度宽范围调节等诸多功能,从而使该控制电路能适用于更广泛的对象.实验证明,以上这些方法行之有效.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...