Light-Driven Polymer-Based All-Solid-State Lithium-Sulfur Battery Operating at Room Temperature

Poly(ethylene oxide)-based polymer all-solid-state Li S battery is a promising candidate due to its high specific energy, good processability, and low cost. However, the poor room temperature ionic conductivity limits its further development. Here an innovative photothermal battery technology is proposed to realize the normal operation at room temperature. This design places the 3D Cu substrate with Cu/Si core-shell structures between Li anode and outer encapsulation glass, so that the light can come in and generate heat efficiently by utilizing the carrier nonradiative recombination of Si nano shell, then the heat quickly transfers to the battery system through Cu core. Once simulated sunlight irradiates, the battery achieves a fast reaction kinetics and superior photothermal conversion, thus realizing a lifespan of over 20 cycles with a capacity of 1089.9 mAh g⁻¹ at 0.2 C. Even on the actual sunlight irradiation, a high discharge/charge capacity of 1065.2/1036.5 mAh g⁻¹ is also reached, indicating an excellent reversible electrochemical process. Moreover, the 3D nanostructure can accommodate the fatal volume variation of lithium and reduce the effective current density, thus suppressing the dendrite nucleation and growth. This study will open the avenue to develop a room temperature polymer all-solid-state Li S battery using photothermal technology.     

一种色温可调LED的封装与性能研究

LED以其优良的性能结合智能控制系统,被越来越多地应用于室内外照明场合,但同时也对其色温、显色指数等色度指标提出了新的要求.为了应对这种挑战,设计了一种新型的色温可调LED,利用大功率LED芯片结合金属基板封装出了色温可调的暖白光高显色指数LED样品,对其发光光谱、色温和显色指数随电流的变化进行了测试,发现LED的光谱...     

Deformation Behavior of MEMS Gyroscope Sensor Package Subjected to Temperature Change

In microelectromechanical system (MEMS) devices, the deformation of MEMS structure caused by packaging induced stress is of great concern since it directly affects the performance of the device. In this paper, deformation behavior of the MEMS gyroscope package subjected to temperature change is investigated using a high-sensitivity moire interferometry. Temperature dependent analyses of warpage and extension/contraction of the package are presented. Analysis of the package reveals that global bending deformation occurs due to the mismatch of the coefficient of thermal expansion between the chip, the molding compound, and the printed circuit board. Detailed global and local deformations of the package by temperature change are investigated, and their effect on the frequency shift of the MEMS gyroscope is studied. It is found that package deformation or package induced stress results in the frequency shift of the MEMS gyroscope structure. In order to increase robustness of the structure against deformation, a "crab-leg" type spring is replaced with a semi-folded spring. The results show that the frequency shift is greatly reduced after applying the semi-folded spring. This frequency shift is within the tolerance limit of the gyroscope sensor in this work     

一种新型封装光纤布喇格光栅传感器的研究

介绍了一种新型的封装光纤布喇格光栅(FBG)传感器。这种光纤光栅传感器使用特殊方法将裸光纤光栅封装在两种聚合物构成的基底中。实验证明,这种封装不但可以将裸光纤光栅的温度灵敏性提高6倍,且封装后的光纤光栅保持了良好的应变特性。     

如何选择温度传感器

本文介绍了几种不同类型的温度传感器。目前我们可提供许多类型的IC温度传感器与多种多样的应用相匹配。从简单的模拟输出温度传感器到数字输出的本地传感器再到具有远程温度监测功能和复杂风扇控制算法的高度集成的温度监视系统，设计工程师可以选择合适的温度传感器监视和控制复杂的电子系统正常运转。     

光纤布喇格光栅(FBG)传感器封装技术的研究

光纤布喇格光栅传感器的应变、温度交叉敏感特性是影响实用化的关键因素,封装是解决这一问题的主要手段.该文通过对比保护性封装、增敏性封装和温度补偿(或分离)等3种光纤布喇格光栅传感器封装的形式与各自的优缺点和应用场合,探讨了光纤布喇格光栅传感器的封装要点和需要注意的问题.     

Performance of Printed Polymer-Based RFID Antenna on Curvilinear Surface

The performance of flexible printed RFID tags affixed onto cylindrical containers is dependent on the inductive behavior of the bent antenna on the tag. Conductive polymeric coil antennas were screen printed onto flexible substrates, and the coil resistances, the inductances, and the S-parameters of the antenna coils were measured and analyzed. The RFID dies were mounted onto the antenna coils and the read ranges were characterized as a function of curvature. The results show that the coil inductance decreased slowly with increasing curvature, and the maximum read range of the tags was markedly reduced with the curvature. The decrease in the coil inductance and the maximum read range were hypothesized to vary with the projected bent coil area instead of the geometric coil area. Experimental results confirmed that the maximum read range of an RFID tag affixed on a curvilinear surface can be predicted by the classical inductive coupling model with the bent projected coil area. On the basis of the experimental and analytical results, a reading reliability factor of two is proposed as a design parameter for flexible RFID tags.     

一种温度检测传感器的设计

路面传感器在公路交通领域有着极其重要的应用,它能够对路面状况信息进行监测及警报,从而大大提高公路交通的安全系数。温度检测传感器用于监测道路表面及下方一定深度处的温度,并结合其他传感器如水膜厚度、盐度传感器等对路面状态进行综合判断。论文主要介绍温度检测传感器的原理、电路结构、测试方法等,给出数据处理的改进方法,提高检测的准确性。     

一种电极型MEMS电场传感器封装结构

为了提高MEMS电场传感器敏感芯片封装的环境适应性,该文提出一种新型的电极型MEMS电场传感器封装结构。区别于将传感器敏感芯片及探头放置于被测环境中,该文通过在MEMS电场传感器封装管壳外部增加封装电极,仅将封装电极暴露在被测环境中,有效避免了传感器敏感芯片封装管壳受到多种恶劣环境的干扰。研制出基于新型封装结构的MEMS地面电场传感器及探空电场传感器,仿真及试验结果表明,该结构传感器能够实现对电场高精度准确测量,在高湿、低温等恶劣环境下输出稳定可靠。     

一种光纤温度传感器的研究

本文提出了一种可用于航空发动机进口温度测量的光纤传感系统，这种双光纤传感器是通过检测光偏振态的变化来测量温度特性的。以蓝宝石单晶片作为探头的敏感元件，可耐２０００℃以上的高温。并且利用蓝宝石晶体的双折射特性得到关于温度的信息，本文从物理模型和数学分析上证实了这种传感器的可行性，用光纤传感器代替传统的发动起进口温度测量系统,可以促进全权数字式电子探测系统再新一代航空发动机中的应用.     

Geometric and Compaction Dependence of Printed Polymer-Based RFID Tag Antenna Performance

Radio frequency identification (RFID) tags with printed antennas are lower in cost but have lower performance than those with metal antennas. Printed antennas can replace metal ones if the performance is increased without raising cost. The performance of printed antennas can be increased if the series resistance in the antennas is lowered. The resistance is dependent on the line thickness and the resistivity of the conductive ink. Printed antennas with different line thicknesses were fabricated to investigate the effect of compaction and thickness on the resistance. The resistance of the printed antenna coils decreased by more than 40% after compaction, while the inductance and the parasitic capacitance were unchanged. RFIDs with compacted printed antennas were found to have significantly increased read range. RFIDs with thick printed antennas were fabricated and tested. These RFIDs were shown to have read ranges comparable to the RFIDs with copper wire antennas. Moreover, a geometry-independent plateau for the read range was found. The presence of a plateau is valuable for thick-line printed antenna since the plateau will enable the usage of low precision printing techniques to lower tag fabrication cost.     

光纤布里渊温度和应变同时传感系统性能分析

采用基于朗道比的微波外差检测技术的布里渊光时域反射传感系统,获得布里渊散射信号的频移和强度,可以精确地测量沿光纤长度的分布式温度和应变信息。此方法在同一条光纤线路上分别测量光纤的布里渊散射和瑞利散射,且使用布里渊频谱扫描对信号进行处理。给出了这种传感方案的实验系统,并在理论推导的基础上对其性能进行了分析,该传感系统可以获得1℃的温度分辨率和100uε的应变分辨率。     

利用DS1620温度传感器构成温度监控系统

为了满足某些环境需要温度测量范围广、温度调节方便等要求,以DS1620温度传感器和单片机为基础,设计了一套温度监控系统。该系统不仅能够根据环境温度的改变自动调节温度,而且由于DS1620芯片的测量范围广,温度调节方便,使该系统在温度控制、温度测量方面更加精确与方便。     

与绝对温度成正比BiCMOS集成温度传感器设计

利用工作在弱反型区MOS管饱和漏电流的指数特性,设计了一款与绝对温度成正比(PTAT) BiC-MOS集成温度传感器,主要电路由PTAT电流产生电路、启动电路和输出电路3部分组成,电路结构简单,体积小.测试结果表明,该温度传感器的精度小于0.5℃,线性度小于0.65％,灵敏度为2.5μA/℃,芯片面积为150 μm×75 μm,具有线性度及灵敏度高的优点,可广泛应于各类便携式电子产品中.     

高温SiC基电子组件的封装

本文介绍了一种可在500℃下操作的金厚膜金属化电气互连系统和厚膜材料基的导电芯片粘附方案,接着采用非线性有限元分析(FEA)了热机械进行评估和芯片粘附的优化。 高温电气互连系统 南于96％Al2O3和AIN在高温下具有良好的化学和电气稳定性,所以被选作为基板材料。Au厚膜在高温下能够提供基本的化学和电气稳定性,因此,被选作为金属化材料和线焊材料。在这里我们要讨论的是能够在500℃下操作的、可用于封装低功率、高温微系统的Au厚膜电子互连系统。     

光纤温度传感器

介绍了双金属片光纤温度传感器的原理，给出了实验结果。测量范围为２０～４０℃，误差＜±１℃。对实验结果进行了误差分析。     

新型全CMOS片上温度传感器设计

利用阈值电压随温度的线性变化关系,设计并改进了一种基于弛张振荡器的全CMOS片上数字温度传感器,提出了一种新型的基于施密特触发器的全CMOS片上数字温度传感器,用于集成电路的热测试和温度保护.仿真结果表明,文中实现的两种数字温度传感器精度均在1℃以内,而且基于施密特触发器的温度传感器仅使用了19个晶体管,与多数文献的结果相比,晶体管数目至少节省了26.9%.     

基于石英晶体的遥测温度计设计

介绍了Y切型石英晶体作为传感器的数字温度计,其输出的频率信号与温度存在较好地线性关系,没有模拟传感器难以克服的温漂、时漂等问题,该温度计可用于高精度的温度测量与控制系统中。实验结果显示,文中设计的数字温度计分辨力为0.05 ℃。系统使用无线数据模块实现了温度数据的传输。     

Asymptotic Performance of a Censoring Sensor Network

We consider the problem of decentralized binary detection in a sensor network where the sensors have access to side information that affects the statistics of their measurements, or reflects the quality of the available channel to a fusion center. Sensors can decide whether or not to make a measurement and transmit a message to the fusion center ("censoring"), and also have a choice of the mapping from measurements to messages. We consider the case of a large number of sensors, and an asymptotic criterion involving error exponents. We study both a Neyman-Pearson and a , Bayesian formulation, characterize the optimal error exponent, and derive asymptotically optimal strategies for the case where sensor decisions are only allowed to depend on locally available information. Furthermore, we show that for the Neyman-Pearson case, global sharing of side information ("sensor cooperation") does not improve asymptotic performance, when the Type I error is constrained to be small.     

一种电流型温度传感芯片设计

设计并实现了一种电流型温度传感芯片。分析了测温原理和厄利效应对测温精度的影响,提出了一种集电极-发射极电压补偿电路,利用一组电流镜和匹配电阻将输出电流和温度之间的传递函数线性化,提高了芯片的线性度和测温精度。设计了反向偏置保护电路,增大芯片可承受的反向电压。芯片采用40 V互补双极工艺设计并流片。测试结果表明,芯片在-55～150 ℃温度区间内的非线性误差为±0.2 ℃,测温精度小于±0.3 ℃。