高温高精度压力传感器

1 前言 许多部门需要精度高、稳定性好,且使用温度高的压力传感器,用于测高温(≥150℃)流体的压力(≥10MPa)。例如:测航空发动机的气流压力。 常用的传感器弹性元件材料为3J53恒弹性合金,但该合金恒弹性温度范围为-55- 80℃。所以,超过80℃其弹模温度系数大,以致传感器性能稳定性不好。而且铌基弹性合金属高温恒弹性材料,而且耐     

谐振传感器在大温度变化条件下稳定振荡的计算机辅助设计

在实验的基础上，利用Matlab对谐振传感器振荡电路进行仿真计算，提出了一谐振式传感器在大温度变化范围内（－40－50℃）稳定振荡的条件及实现方法。     

平板式极限电流型氧传感器热应力数值分析

对平板式极限电流型氧传感器冷启动时的热应力耦合场进行了模拟。通过施加阶跃电压取代恒定电压的方法,解决了响应时间和稳定工作温度的矛盾。电热耦合模拟分析结果显示,设计的传感器响应时间为5 s,稳定工作温度为800℃。热力耦合模拟分析显示,在氧传感器实际安装使用时,热应力主要取决于装配应力,由于LSCM/3YSZ扩散障材料的热膨胀系数与YSZ电解质材料相近,用它制备氧传感器,其最大热应力小于各层材料的断裂强度,解决了LSM与YSZ热不匹配的问题。     

防尘过滤器对湿敏电容传感器低温使用的影响

我部用BSF－QDI型标准湿度发生装置对从芬半引进的HMP45D型湿敏电容传感器进行了20℃和30℃温度条件下的测试,测试中发现不仅两种温度条件下时间常数有很大差异,而且在－30℃时该湿敏电容传感器的防尘过滤器对其时间常数和测量误差有较大影响,本文根据湿敏电容传感器的结构特点,依据试验结果,经进一步试验和分析,找到了产生的原因和解决的方法。     

SIMOX—一种适用于高温硅传感器的工艺技术

研究开发了一种采用新颖的SOI“SIMOX”(氧离子注入隔离)工艺技术制作的硅压力传感器。这种器件展示了广阔的应用温度范围,它在400℃以上灵敏度理论特性为1/T。其原因乃是电阻之间以及与获得二氧化硅埋入层的衬底之间的完美的隔离。本文介绍了一种微机械加工的原型SIMOX技术研制的压力传感器,其灵敏度为40mV/V,线性度及滞后性优于0.2％,而且稳定性好。     

汽车用传感器（七）汽车用气敏,湿度及光电传感器

１氧传感器在使用三元催化转换器降低排放污染的发动机上,氧传感器是必不可少的。空燃比一旦偏离理论空燃比,三元催化剂对ＣＯ、ＨＣ和ＮＯｘ的净化能力急剧下降。故在排气管中插入氧传感器,根据排气中的氧浓度测定空燃比,向微机控制装置发出反馈信号,以控制空燃比收...     

掺杂CdSe纳米晶粒的玻璃纤维传感器在温度测量上的应用

报导了掺杂CdSe纳米晶粒的磷酸盐玻璃作为敏感元件的温度纤维传感器,在低于玻璃的退火温度（＜370℃）时,这种玻璃表现出可逆的温度感应吸收的漂移,利用反射光栅和双池光电二极管的双波长探测方案,可以消除强度相关传感器中各种信号损耗的影响,在－20到＋120℃温度范围内测试传感器样机,对温度变量显示了一个线性响应。     

Si微压力传感器

在工业应用中,要求具有小型和稳定的压力传感器。我们利用普通的平面集成电路技术开发了一个新的传感器。为了避免长漂,依赖于压力灵敏度的温度补偿是由enbedded稳压电源而不是由传统的电阻网络。输入压力范围是0—0.1MPa。灵敏度变化为200ppm/℃或更好,非线性误差(包括滞后)为满刻度的0.05％。传感器可以安装在印刷电路板上。     

基于温度自适应补偿技术的氧气传感器的研究

荧光氧气传感器在使用过程中,温度变化会降低氧浓度测量精度或测量失效,因此,该文采用氧浓度、温度融合检测技术,通过不同温度下确定氧浓度与温度的经验函数关系,提出一种温度自适应补偿技术,消除温度变化对氧浓度测量精度的影响。通过实验室模拟测试,荧光氧气传感器在(-10～50)℃温度范围内,氧浓度测量精度优于±2.0%FS。     

遥测气象仪的硬件设计及维修技术（续一）

四、气象仪的传感器气象仪采用的传感器有：测温传感器、测湿传感器、测风传感器、气压传感器、雨量传感器、云底高测量仪及能见度测量仪。为了提高气温、湿度（或露点）测量的精度，当气温高于0℃时，用干湿球测量方法，这时采集的是干球温度和湿球温度，由公式计算出相对湿度和露点；当气温低于0℃时，使用氯化理露点传感器测量露点温度，这时采集的数据是气温（干球温度）和零点温度，由公式计算出相对湿度。我们也可以采用湿敏电容传感器来完成相对湿度的测量，再由计算公式算出露点温度。但湿敏电容传感器只能工作在一20℃以上的气温环…     

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...     

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。     

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。     

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.     

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.     

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。     

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...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

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.