Research on Signal Pickup System for the Wireless Passive LC Resonant Pressure Sensor

在高温、潮湿等恶劣的环境中以及眼内压测量、疤痕治疗等应用场合，不便利用有线有源的传感器进行压力监测，LC谐振式无线压力传感器采用无线无源方式实现对压力信号的提取，拓展了压力传感器的应用范围。目前，LC谐振式无线压力传感器的信号拾取主要使用网络分析仪或阻抗分析仪，不仅成本高，而且携带不便，极大限制了非实验室场合的应用。本文针对LC谐振式无线MEMS压力传感器的信号拾取现状，从理论分析、系统仿真、硬件设计、软件设计和实验验证等方面展开研究，设计了基于阻抗实部测量法的信号拾取系统。 基于电感耦合理论，从阅读天线和LC谐振式无线压力传感器耦合模型的等效阻抗出发，对相位测量法、阻抗实部测量法、S11测...In harsh environment such as high temperature and humidity, or applications like intraocular pressure measurement and scar treatment it’s difficult to detect with wired and active sensors. LC resonant pressure sensor expands the application range of the pressure sensor by measuring pressure in a wireless and passive way. At present, The signal pickup instrument for the wireless passive LC resonant...学位：工学硕士院系专业：航空航天学院_机械电子工程学号：1992013115288

中外高校人文社科英文图书收藏分析和保障体系建设

针对我国高校人文社科英文图书收藏无法满足学科研究和保障建设需要的现状,通过将CASHL与哈佛大学、耶鲁大学、牛津大学的联合馆藏目录进行对比分析,找出我国高校人文社科英文图书收藏的差距和整体化建设存在的问题,提出外文图书保障体系建设策略

The Circuit Design of Piezoelectric Jetting Dispensing Control System

基于新型压电式点胶头采用的双压电陶瓷的推挽驱动作为胶体喷射的作用机制,设计并搭建了压电式喷射点胶控制系统,完成了硬件与软件模块的组装调试,实现对下压电陶瓷信号的频率、占空比、幅值、上压电陶瓷信号幅值的连续可调,具备人机交互、清洗、喷射点数可调等功能。经测试,系统各参数达到预定指标,频率显示误差:±1.2 Hz;占空比显示误差:±1%;幅值显示误差:±8 MV。在驱动方波电压200 V、频率65 Hz、占空比20%、喷嘴直径250μM、供料压力4 bAr、喷射高度3.5 MM的条件下,得到平均直径为1.07 MM左右的喷射胶滴,一致性误差为±2%。According to the working principle of newly piezoelectric dispensing head,which using the pushed driving of double piezoelectric ceramic for colloform jetting,we design and establish this piezoelectric jetting dispensing control system.Meanwhile,package the hardware and debug the software,achieve the goal that frequency,duty cycle and amplitude of the lower piezoelectric ceramic signal,amplitude of the upper piezoelectric ceramic signal can be continuously adjusted.The system has the function of man-machine interaction,cleaning,regulating injection points,and so on.After tested,all of the system parameters can meet the presupposed index,with the frequency display error: ±1.2 Hz,duty cycle display error: ±1%,amplitude display error: ±8 mV.Under the condition that voltage of the driving squarewave 200 V,frequency 65 Hz,duty cycle 20%,diameter of nozzle 250 μm,pressure 4 bar,height of jetting 3.5 mm,we get the jetting drops with an average diameter of 1.07 mm,and its conformity error ±2%.中央高校基金科研业务费专项资金资助项目(2010121039

Dynamic Parameters Test of Micro-Machined Gyroscope Based on LabVIEW

针对当前测试微机械陀螺动态参数存在耗时长、效率低等缺点,提出了一种新的测试陀螺动态参数的方法,该方法通过lAb-VIEW编写的测试软件控制一数据采集卡和信号调理电路激励陀螺振动并采集其驱动方向上的振动数据,从采集的振动数据中提取出波峰和波谷进行指数拟合获取陀螺的衰减系数和固有频率,最后根据阻尼振动方程计算出陀螺的阻尼比和谐振频率,同时获取陀螺的品质因子;该方法能够实现自动记录和处理陀螺的振动数据;整个测试过程只需15S左右,提高了测试效率;利用该方法测试了30种不同气压下陀螺的品质因子,得到的陀螺的品质因子与气压值的关系曲线和理论研究结果相符,从而为陀螺动态参数的测试提供了一种有效的手段。For the current method test dynamic parameters of Micro-machined Gyroscope has some defects,such as time-consuming and low efficiency,a new method test dynamic parameters of gyroscope is put forward in this paper,this method control a data acquisition card and signal regulate circuit to drive gyroscope vibrate and collect the vibration data on the drive direction of gyroscope by a test software written in the LabVIEW,then extract peaks and troughs from the vibration data to get the attenuation coefficient and the inherent frequency of gyroscope through index fitting,finally calculated the damping ratio and the resonant frequency of gyroscope according to the damping vibration equation and get the quality factor at the same time.The method can realize recording and processing the vibration data of gyroscope automatically.The entire testing process takes about 15 seconds,so this method has improved the test efficiency.Using this method tested the quality factor of the gyroscope in 30 different pressure,the relation curve of quality factor and the pressure value is conform to the theoretical results,thus this paper provide an effective means for the dynamic parameter test of gyroscope.航空科学基金(20110868001

Study on Low-temperature Si-Si Bonding Based on Combination of Dry and Wet Activation Methods

针对传统的硅片低温键合方法,提出了一种将湿法活化与等离子体干法活化相结合的硅片直接键合方法.通过工艺参数实验得到了在等离子体活化时间为90S、预键合施加负载为1 500n时可以实现较好的键合.之后进行了此法与干法活化和湿法活化的对比实验,结果表明此法在获得较高键合强度的同时可以明显减少采用干法时在退火后空洞的产生,满足后续工艺的使用要求.最后用干湿结合的方法实现了带腔体硅片的键合,弥补了湿法活化在硅片键合上的运用限制.Aimed at the traditional low-temperature silicon bonding methods,this article proposed another silicon direct bonding method combining the wet processes of activation with plasma dry of activation.A fine bonding quality can be achieved using the parameters of 90 s plasma activation time and 1 500 N prebonding pressure acquired by the process parameter experiment.Then a comparison experiment between this method and both the only dry and wet activation methods was presented.The consequence shows that this combination method can effectively avoid cavities that can be produced while using dry activation method after annealing,and a high bonding strength can be achieved at the same time.Subsequence application requirement can be meted in this way.At last,based on this combination of dry and wet activation method,the bonding of silicon and silicon with the hermetic cavity was realized making up for the limitation of wet activation method′s application.航空科学基金项目(20110868001); 惯性技术航空科技重点实验室资助项

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies