宽甸晶体管厂产品介绍

一、PN结温度传感器 1.技术指标:测温范围:-50～150℃;线性度:≤±0.5％;灵敏度:-231 mV/℃;稳定度:<0.05℃/年。 2.规格型号:     

半导体温度传感器在直升飞机测温上的应用

半导体温度传感器具有较高的精度和良好的线性输出。采用LM135型半导体温度传感器,与CPU、数码管接口,经A/D和V/F转换等信号处理,成功研制了某直升飞机数字大气温度显示器,取代了双金属片指针式温度计。试验结果表明LM135传感器在-55℃～70℃可以实现单点校准,在-60℃～-55℃出现非线性,可以通过程序进行单点补偿校准。     

半导体温度传感器在直升飞机测温上的应用

半导体温度传感器具有较高的精度和良好的线性输出。采用LM135型半导体温度传感器,与CPU、数码管接口,经A/D和V/F转换等信号处理,成功研制了某直升飞机数字大气温度显示器,取代了双金属片指针式温度计。试验结果表明LM135传感器在-55℃～70℃可以实现单点校准,在-60℃～-55℃出现非线性,可以通过程序进行单点补偿校准。     

用于遥测的新型水晶温度传感器

宽度弯曲模式音叉热敏新切型的新型水晶温度传感器具有高准确度、高稳定性、超高分辨力等优良特征.经测试,其分辨力可达10-3～10-5 ℃,灵敏度远远高于绝大多数温度传感器和温度计[3];其长期稳定性在1年内可达0.001～0.01 ℃.由于水晶温度传感器的输出是频率信号,抗干扰能力强(干扰信号可高达25db以上).配有RS485接口标准组成的局域网,可方便地构成远传及联网结构,解决了高精度区域性测试的难题.因此,在气象和海水温度测试中,具有广泛的应用前景.     

面向CPT铷原子钟频率合成器优化

采用锁相环频率合成技术产生3.417GHz微波频率并对其优化,相位噪声为-104.75dBc/Hz@100kHz,将优化后的锁相环频率合成器加载到VCSEL(Vertical Cavity Surface Emitting Laser垂直腔面发射激光器)上对驱动电流进行幅度调制,使VCSEL产生具有特定光频差的高度相干双色光,测试原子对±1级边带的多普勒吸收峰,通过改变微波信号的功率从-10dBm到+8dBm,测试在不同温度下改变微波功率对多普勒吸收峰的影响,找到对应工作温度下最佳的微波功率使得铷原子对±1级边带吸收峰最大,测得温度在64℃、65℃、66℃时,最佳微波功率分别为-3dBm、-1dBm、3dBm,为后续CPT(Coherent Population Trapping相干布局囚禁)信号测试奠定基础。     

低功耗小尺寸片上温度传感器设计

为了精确测量芯片内的温度分布,提出了一个低功耗、小尺寸的温度传感器。该传感器使用一个输出电流与绝对温度成比例(PTAT)的电流发生器检测环境温度,然后使用一个源耦合流控振荡器将PTAT电流转换成频率输出。所提出的电路采用22 nm SOI CMOS工艺设计并制造,其有源区域占用的片上面积为0.01 mm~2,电源电压为0.8 V。测量结果表明,所提出的架构能够在-40～+85℃的温度范围内工作。工作于+85℃时,温度传感器的功耗达到最大值,为500 nW。使用单点校准后,该温度传感器的最大温度误差小于1℃。     

两种封装的光纤光栅温度传感器的低温特性

介绍了光纤光栅(FBG,Fiber Bragg Gratings)温度传感器的两种封装形式。推导了两种FBG温度传感器的温度敏感因素并进行了实验验证。实验研究了两种FBG温度传感器在-70~0 ℃的中心波长低温变化特性,比较了相同条件下两种FBG温度传感器的实验结果。结果表明:细不锈钢管封装的FBG温度传感器的中心波长在-60 ℃时发生了突变,急剧下降;而镀金FBG温度传感器的中心波长在-70~0 ℃随温度线性变化,重复性较好并且几乎没有迟滞现象。两种传感器在线性变化区间的温度灵敏系数KT 分别为28.2 pm/ ℃和21.3 pm/ ℃,分别是裸光纤布拉格光栅的3倍和2.3倍,它们的线性拟合度都超过0.999。     

面向气象探空的微型热敏电阻设计及性能研究

针对高空气象探测用温度传感器存在响应时间长、测温精度差以及辐射误差大等现状，研制了一种封装体积小、响应速度快、抗辐照能力强的温度传感器。采用固相法制备了Mn-Ni-Cu-Fe-O基片状热敏电阻，尺寸分别为0.4 mm×0.4 mm×0.25 mm与0.6 mm×0.6 mm×0.25 mm。在片状热敏电阻敏感元表面依次沉积绝缘膜和铝金属反射薄膜。结果表明，研制的热敏电阻在-80℃～60℃范围内，其阻值范围分别为1 000 kΩ～4.2 kΩ与375 kΩ～1.6 kΩ;热耗散系数为1.034 mW/℃,响应时间为0.63 s。利用太阳光模拟器对热敏电阻进行太阳辐射测温误差研究，在100 W/m²的辐照强度下测温误差最小为0.22℃。该热敏电阻有望应用在高空气象探测的探空仪中。     

1-Wire温、湿度传感器及DZT-512单总线温度巡检仪

1-Wire温度传感器 具有高精度、低成本、数字传输、1-Wire联接等突出优点。1-Wire数字温度传感器包括:DS1820、DS18820、DS18S20、DS1822。测温范围:-55-+125℃;精度:±0.5℃;分辩率:0.1℃。     

基于GA-BP神经网络温度补偿的红外温度传感器设计

为减少环境温度对红外测温的影响,并提高测量精度,提出了一种基于热电堆与热敏电阻的红外探头、Cortex-M3 ARM处理器及高精度低噪声测量电路的红外温度传感器。利用梯度下降法建立红外探头的输出电压、环境温度和目标温度的BP神经网络模型,用遗传算法对其初始权值和阈值进行优化,并将基于该模型的算法嵌入ARM处理器,求出目标温度。该红外温度传感器实现了对物体温度-10～+50℃范围的测量,平均绝对误差为0.033℃,均方根误差为0.035℃。     

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...     

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.     

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...     

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....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.