基于改进虚拟力算法的水质传感器部署

文中设计了基于网格划分的改进虚拟力算法。将水底表面划分成三维网格,定义的虚拟力包括邻居节点的作用力、网格对节点的吸引力、障碍物的斥力和目标覆盖区域边界斥力,以及补偿虚拟力,综合这些虚拟力使传感器节点移动,求得最佳位置。通过理论论证和仿真实验,该算法能够有效提高水质传感器三维覆盖率和均匀性,节约节点数量和部署成本。     

压电射流角速度传感器的软件补偿技术

介绍了压电射流角速度传感器的软件补偿技术,给出了压电射流角速度传感器的温度补偿和线性补偿的原理和程序。通过合理选择单片机,利用数据插值和查表相结合的方法,实现了传感器的温度补偿和线性补偿,实验结果表明,经过软件补偿后传感器的非线性度从2%减低到0.5%,工作温度范围从0～45℃拓宽到-40～+55℃。 此种补偿方法,简单易行,对于其他类型的传感器,只要其重复精度足够高,该技术具有普遍意义。     

低温漂过载加速度传感器

过载加速度传感器,是采用了最新的MEMS技术与微电子技术研制的一种新型硅压阻加速度传感器,集加速度敏感元件、信号放大、饱和控制及温度补偿等于一体,对传统的电桥放大电路和温度补偿电路进行了改进,使得传感器温漂更小且具有可编程补偿温度和增益调整等功能.     

虚拟多天线无线传感器网络

提出一种基于虚拟多天线技术的分布式和协作的无线传感器网络,分析了该虚拟多天线无线传感器网络的性能。同点到点的无线传感器网络相比较,在天线传输信号能量相同的情况下,虚拟多天线无线传感器网络的误比特概率(BER)更小;或者在同样误比特概率情况下,虚拟多天线无线传感器网络的天线传输信号能量更低。这些特性能够提高无线传感器网络的性能或延长无线传感器网络的使用寿命。     

传感器测量电路中温度补偿方法及原理分析

在传感器测量电路中,温度是影响传感器特性的重要因素。由于传感器实际工作环境的温度变化幅度很大,需要采用温度补偿技术来抑制环境温度对传感器特性的影响。本文针对惠斯通电桥压力传感器温度补偿电路及霍尔传感器温度补偿电路中的温度补偿方法进行原理分析,以期达到在其他传感器测量电路中能够选择合适温度补偿方法的目的。     

传感器电桥电路的非线性补偿方法探讨

传感器电桥电路的非线性参数测量技术误差的补偿消除问题,始终是我国电力科学技术事业发展版图中的重要问题,文章针对传感器电桥电路的非线性补偿方法问题,首先简要阐述了文章研究问题的实际产生背景,之后围绕传感器电桥电路的非线性反馈补偿技术的实现原理展开了具体的论述讨论,预期为相关领域的技术人员提供借鉴参考。     

虚拟实验系统在“传感器与测试技术”课程中的应用

面向专业背景以力学、结构设计为主的飞行器设计与工程专业本科生,将“传感器与测试技术”课程内容与航空航天应用相结合,能够加深学生对传感器原理的理解、提高对测试技术的掌握,并促进理论和实践的联系。以飞行器结构无损检测的具体应用案例为基础,开展了结构虚拟检测实验平台的建立,探讨虚拟实验在“传感器与测试技术”课程中融入、运行和评测的方式,满足了学生动手操作实验的需求,实现了书本知识和应用的有机融合,促进了学生自主和探索式的学习。     

虚拟MIMO技术

介绍了无线资源管理上行链路中的虚拟MIMO技术,重点分析了该技术各种用户配对方案的优缺点和经典的资源调度算法,最后介绍了虚拟MIMO技术国内外研究成果及虚拟MIMO技术在无线传感器网络领域的广泛应用前景.     

基于Labview--电容传感器的实验设计与教学

为了使学生更好的学习和掌握传感器技术、检测技术,通过采用Labview软件与电容检测电路相结合的方法,设计Labview———电容传感器的实验项目,它集检测技术、传感器技术和虚拟技术为一体。能进一步的提高学生学习积极性和专业创新性。     

催化燃烧式瓦斯传感器技术研究进展

首先分析了催化燃烧式瓦斯传感器的工作原理,然后综述了催化燃烧武瓦斯传感器的标定与补偿技术现状,最后指出,综合考虑催化燃烧式瓦斯传感器的稳定性和一致性,探索研究在初始不一致和工作过程不稳定的双重作用下,传感器数据的变化规律,通过智能信息处理的方法予以动态补偿,将是下一步需要研究的主要方向.     

Analysis, Design, and Performance of a Capacitive Pressure Sensor IC

Medkcal research has an urgent nieed for a small, accurate, stable, low-power, biocomnpatible, and inexpensive pressure sensor with a zero to full-scale range of 0-300 mmHg. A comparison of fundamenital transducer limits shows that the capacitive device offers better accuracy than the piezoresistive type. Limitations of the on-board circuitry, needed to buffer the transducer capacitor against parasitic capacitanice, hatve previously prevented the realilzation of this accuracy. An integrated circuit (IC) for use with acapacitive pressure transducer was designed, built, and tested. Capacitance is measured by a new ratiomnetric scheme employing an on-chip reference capacitor. The typical random pressure measuarement error due to resolution and nonlinearitiy is ±0.4 mmHlg (with a full-scale of 300 mmHg). The long-term systematic error due to falling battery voltage is ±0.6 mmHg. These figures Were calculated from measurements of temperature, supply dependence, and nonlinearity on completed integrated circuits. The ature compensation of the transducer.     

电容式压力传感器电路的温度补偿

本文提出了一种电容式压力传感器的温度补偿方法，它适用于在不同输入压力下的温度补偿。本文设计的相应的补偿电路，经高低温测试，其补偿效果良好，对变送电路的输出输入关系也作了推导。     

Design and test of a capacitance detection circuit based on a transimpedance amplifier

This paper presents a transimpedance amplifier (TIA) capacitance detection circuit aimed at detecting micro-capacitance, which is caused by ultrasonic stimulation applied to the capacitive micro-machined ultrasonic transducer (CMUT). In the capacitance interface, a TIA is adopted to amplify the received signal with a center frequency of 400 kHz, and finally detect ultrasound pressure. The circuit has a strong anti-stray property and this paper also studies the calculation of compensation capacity in detail. To ensure high resolution, noise analysis is conducted. After optimization, the detected minimum ultrasound pressure is 2.1 Pa, which is two orders of magnitude higher than the former. The test results showed that the circuit was sensitive to changes in ultrasound pressure and the distance between the CMUT and stumbling block, which also successfully demonstrates the functionality of the developed TIA of the analog-front-end receiver.     

虚源法辅助的高效波导不变量被动测距技术

针对水声通信网络节点拓扑结构测量需求,本文研究了基于波导不变量的高精度被动测距算法,为解决波导不变量法计算量大的问题,提出了一种虚源法辅助的高效率节点间距离测量算法。考虑到海水中的声速受海水的温度,盐度,深度等因素影响,故采用声速补偿方法得到更合适的声速,从而提高测距精度。仿真结果表明结合声速补偿的虚源法测距结果误差明显下降。在结合声速补偿虚源法缩小测距范围的基础下,波导不变量精确测距的计算量明显降低,同时测距结果精度也得到提高。从而得出结论,基于结合声速补偿虚源法的波导不变量被动测距技术可以在降低计算量的同时实现精确测距。      

An ultraminiature CMOS pressure sensor for a multiplexedcardiovascular catheter

A multiplexed ultraminiature pressure sensor designed for use in a cardiovascular catheter is described. The sensor operates from only two loads, which are shared by two sensors per catheter. The sensing chip is 350 μm wide by 1.4 mm long by 100 μm thick. CMOS readout circuitry at the sensing site converts applied pressure to a frequency variation in the supply current, which is detected at the end of the catheter by a microprocessor-controlled interface. The nominal pressure sensitivity is 2 kHz/fF about a zero-pressure output frequency of 2.7 MHz. This on-site circuitry contains two reference capacitors which allow external compensation for nonlinearity and temperature sensitivity and has an idle-state power dissipation of less than 50 μW. With the transducer sealed at ambient pressure, the device can resolve pressure variations of about 3 mmHg, while vacuum-sealed devices do considerably better and should permit <2 mmHg resolution in practical systems     

基于ADμC812温度补偿系统的压力变送器

基于ADμC812微处理器,建立了稳压补偿数学模型,从而使压力随温度的变化呈线性关系。测试结果表明,用一种软件数据处理算法代替传统的硬件补偿校正电路,具有输出线性良好、节省成本的优点,同时,整个系统具有结构简单、操作简单、输出精度高的优点;静态输出电流精度控制在5‰以内,达到国家统一仪表准确度一级标准。该种数学模型的建立方法可适用于声学系统的超声波传感器的数据拟合,实现超声波传感器在不同的应用环境下满足测距及其他测量的测量精度。     

Design and characterization of a high temperature fiber-optic pressure transducer

We have measured the pressure response of a high temperature pressure transducer fabricated from a super alloy. This transducer contains a microbend fiber-optic sensor to measure diaphragm deflection and a reference fiber to help reduce light source fluctuations caused by perturbations in the fiber leads. The transducer was characterized at pressures up to 22.8 MPa and temperatures to 430°C. The experimental data taken at constant temperature shows a 0.58 percent (of full scale pressure) minimum deviation between the fiber-optic pressure transducer output and output of a calibrated gage pressure transducer. Over the entire temperature range of20-430degC, the fiber-optic pressure transducer output exhibits a 1.2-percent (of full scale pressure) maximum deviation from calibrated pressure.     

Compensation of Temperature-Drift Errors with No Additional Hardware

A new approach that does not require additional hardware for temperature-drift compensation is reviewed. The efficiency of the new approach depends on the repeatability of the input transducer temperature-dependent transfer characteristics. A simple polynomial approximation of the measurand model was used in the application example. To bring the temperature-compensation efficiency to the level limited by the repeatability of the transfer characteristics of the input transducer, advanced fitting methods can be used.     

参量换能器收发电路设计

介绍了超声波参量换能器的工作原理,设计了一种声学参量换能器结构、超声波发射电路和声波接收电路。发射电路由正弦信号产生电路、功率放大电路和补偿电路等组成,声波接收电路由前置放大电路和带通滤波电路组成,并利用NI公司的6024E数据采集卡进行数据采集。理论分析表明,当原波信号为87 kHz时,利用该收发电路可以较好地实现参量阵差频信号的发射与接收。     

圆平膜片压力传感器线性度的计算机模拟

文章在全面考虑横向和纵向灵敏度系统对压力传感器线性度影响的基础上,给出了圆平膜片压力传感器在两种薄膜应变片基本布置方式下传感器灵敏度的实用计算公式,虽形式上比较复杂,但计算结果更接近薄膜压力传感器的实际情况,适合于用来对敏感膜片进行线性度的优化设计。