Wireless Power Generation Strategy Using EAP Actuated Energy Harvester for Marine Information Acquisition

The energy of a radio wave is reduced through the dispersion, the refraction and the absorption because the medium transferring the vibration of a radio wave is the seawater. In the end the reduced energy of a radio wave causes the reduced transmitting length for communication, the long postponed communication and the frequent error. The subsea communication for the marine environment monitoring which must overcome the weak points of the RF wave and the most practical method for the marine sensor network realization is to use the acoustic wave method, but the energy consumption rate of the acoustic wave communication method is about 100 times greater than the one of the RF wave method. So, the power supply of the sensor node in the marine sensor network system is the most important interest field. In this study, the sample which consists of an acrylic elastomer(VHB4905 film from 3M), conductible carbon grease(from MG chemical) and electric wire for the basic study of an energy harvesting strategy and technique using EAP actuator was fabricated, and the conductible carbon grease was used for an electrode. The characteristics of the fabricated sample were analyzed through the experiment. We also mixed carbon grease with aluminum powder for conductibility improvement, and the effect of the mixed electrode was confirmed through the conductivity measurement.

Monitoring System for Field Soil Water Content Based on the Wireless Sensor Network

[Objective] To water content monitoring study the application of wireless sensor network in field so and to discuss the methods for solving the problems of low sampling rate, high cost and poor real-time in actual monitoring. [Method] The architecture of wireless sensor network, network nodes, hardware design as well as principle for the program structure of software operating system and corresponding parameters were analyzed to illustrate the characteristics of monitoring system for field soil water content based on wireless sensor network, and the advantages in application of this system. [Result] Sensor nodes could correctly collect and transmit soil water content, realize stable data transmission of soil water content, indicating that wireless sensor network is suitable for real-time monitoring of field soil water content. [Conclusion] This study indicates that wireless sensor network possesses a widely application foreground in the development of agriculture.

基于Wireless USB的数据采集系统设计

针对工业生产过程中大批量高速数据采集和实时传输处理的要求。采用Cypress公司的无线USB系统作为无线数据的射频收发模块,结合Cypress公司的EZ-USB系列芯片和Altera公司的ACEX1K系列FPGA芯片设计了一套数据信号采集和无线传输系统。主要阐述了整个系统的原理、硬件构建方法和软件部分的开发过程。

Research on Wireless Monitoring Technology of the Well Site Environment

Based on the characteristics of wireless communication technology and Wireless Sensor Network, this paper studies the well site environmental monitoring system. The relevant hardware and software of the system are designed to monitor the well site environment, thus preventing downhole accidents. The system uses the wireless ZigBee technology as the transmission mode, and combines the virtual instrument technology to design the upper machine interface. The test results show that the system can monitor the outdoor environment in real time. When the environmental parameters exceed the set value, the corresponding location of the LabVIEW interface will send an alarm.

High-g Shocking Testing of the Martlet Wireless Sensing System

This article reports the latest development of a wireless sensing system,named Martlet,on high-g shock acceleration measurement.The Martlet sensing node design is based on a Texas Instruments Piccolo microcontroller,with clock frequency programmable up to 90 MHz.The high clock frequency of the microcontroller enables Martlet to support high-frequency data acquisition and high-speed onboard computation.In addition,the extensible design of the Martlet node conveniently allows incorporation of multiple sensor boards.In this study,a high-g accelerometer interface board is developed to allow Martlet to work with the selected microelectromechanical system(MEMS)high-g accelerometers.Besides low-pass and highpass filters,amplification gains are also implemented on the high-g accelerometer interface board.Laboratory impact experiments are conducted to validate the performance of the Martlet wireless sensing system with the high-g accelerometer board.The results of this study show that the performance of the wireless sensing system is comparable to the cabled system.

Design and validation of wireless strain test system for bridge based on the resistance strain sensor

In order to achieve an access to strain sensor data with wireless transmission in bridge engineering structure testing, a wireless strain test system is presented based on the resistance strain sensor of networks. The wireless bridge strain test system composed of master station and substation adopts the wireless method to realize the high accuracy data acquisition between the master station and the substation under a reliable communication protocol. The system has been tested in contrast with the present strain apparatus. Results show that the wireless system is high-reliable, and has many characteristics such as high efficiency, good precision, high stability with low cost, and good flexibility, without using the present communication network.

基于GIS的农田墒情管理系统应用研究

以农田土壤墒情监测过程和数据分析与管理过程为研究对象,建立农田土壤墒情监测和数据分析过程模型,对当前农田土壤墒情监测过程中的不足进行分析,并结合无线网络传输技术和GIS地理信息技术构建农田墒情管理系统功能模块,实现土壤墒情数据采集、分析处理及管理输出。农田墒情管理系统运行结果表明:系统能够实时快速对农田土壤含水量进行监测,同时能够对土壤水分含量数据动态变化过程进行管理,便于土壤水分含量变化趋势的预测。

基于Python的无线传感器网络数据采集系统

无线传感器因节点结构复杂度高,数据量巨大,无法在海量数据中快速采集用户需求数据.为解决该问题,研究设计了基于Python的无线传感器网络数据采集系统,系统硬件包括数据采集芯片选型单元、无线收发芯片选型单元与串口通讯电路设计单元;软件模块包括网络数据挖掘采集框架设计模块、采集数据压缩模块和采集数据缓存模块.通过对上述硬件单元与软件模块的设计与开发,实现无线传感器网络数据采集系统的运行与应用.实验数据显示:相较于基于Android安全容器的网络数据采集系统,应用设计系统采集数据耗时更短、压缩率数值更大、能耗更小,充分证实设计系统的数据采集性能更佳.

TLJ型土工离心机数据采集系统更新升级

长安大学TLJ-3土工离心机自2004年建成投入使用以来,已经运行18 a,为该系列运行时间最长的土工离心机。由于20世纪初电子设备集成性较低等原因,早期的TLJ型离心机数据采集系统逐渐无法满足现有试验数据的高精度、大数据量吞吐等采集需求。基于无线传输技术消除了电滑环接触电阻变化对数据传输影响的问题,采用光纤集成多个传感器使得传感器小型化,采用非接触式位移场扫描实现地表的全断面监测,基于Open CV图像拼接技术解决了图像畸变的问题。升级改造后的TLJ-3土工离心机已服务于若干研究项目,性能良好。

Wireless Base Stations:Any Scale,Any Terrain

It becomes faster and faster of the telecommunication development with the wireless technology evaluation.The communication between each other becomes more and more popular and widely,it already is one indispensable part of our life.The wireless coverage is the key parts to supply service for subscribers.How to build the wireless site in different scenarios,such as urban,suburban,high railway,remote areas,etc? It will be discussed and proposed in this paper.Our vision is that to make better service for the general radio service for the people.

信道状态信息无线感知数据获取及应用综述

近年来,基于信道状态信息(CSI)的无线感知技术在室内定位、活动识别、健康检测等方向有众多探索性研究应用。然而,现有研究获取CSI数据主要依靠自主采集,对CSI开源数据集和数据采集设备/工具的研究现状不够清晰。首先阐述了基于无线保真(WiFi)CSI的无线感知技术,详细介绍了9种CSI数据采集设备/工具,概括了CSI的应用方向及研究现状,并汇总了近5年的CSI开源数据集,分析了现有CSI无线感知研究的局限性与面临的挑战,最后总结全文并对CSI无线感知未来的发展进行展望。

基于模糊神经网络的数字媒体数据自动化采集系统设计

为了改善数字媒体数据传输效果,确保系统安全、稳定运行,设计基于模糊神经网络的数字媒体数据自动化采集系统。构建数字媒体数据自动化采集系统框架,数据采集层利用数据采集卡获取不同渠道的数字媒体数据,由数据处理层的数据融合模块调用改进模糊神经网络算法完成数字媒体数据的融合处理后,通过数据传输层的分层自组织无线网络将其传输至存储应用层,实现数字媒体数据的存储、查询、显示与输出。实验结果表明:该系统采集的音频信号波形规律、曲线平滑、功率均值波动误差在(0,0.14),满足允许误差范围;数据传输效果优于采用DSR协议的单点传输方式,当数字媒体数据源为3时,平均峰值信噪比指标最高;具有数字媒体数据查询功能。

无线激光功率计数据采集传输模块设计

为实现远程激光功率的测量并保证数据传输的安全性,设计了一种非联网的无线激光功率计数据采集传输模块。该模块由三个部分组成:STM32数据采集模块、无线RS485透传模块和Qt上位机软件。其中STM32数据采集模块将探测器采集的电压模拟信号转换为数字信号,无线RS485透传模块负责STM32数据采集模块与PC端的数据通信,Qt上位机程序处理接收的数据并显示实时激光功率曲线。验证实验结果表明,在1 km传输距离下,该模块成功采集到完整的激光功率曲线,数据传输出错率为0。该模块实现了远距离、高速率的功率数据采集和传输功能,为后期无线激光功率计的研制工作奠定了基础。

基于物联网的浮标数据采集与控制系统设计

数据采集与控制技术是浮标观测系统的核心。结合无线通信技术提出了基于物联网的浮标数据采集与控制系统方法,并研制了基于Socket协议的通信控制器和数据融合采集系统,实现了浮标观测系统通过软件配置的方式进行传感器的接入与管理,解决了总线式数据采集与控制技术在传感器可扩展性、即插即用性方面的不足。组网测试结果表明,该系统网络内部数据发送与接收准确率达100%,远程数据中心数据平均接收率大于等于98.3%,且系统接入传感器无须软硬件设计编码,具有数据接收稳定、观测系统扩展复杂度低和新增硬件功耗低等优点,在海洋浮标观测系统应用方面具有良好前景。

无线应变采集技术在飞机强度试验的应用研究

为解决应变测量过程中线缆过长、体量过大、工序复杂造成的测量准备周期长、工作量大、故障定位困难、试验空间紧张等问题,研制了基于超薄芯片封装技术的无线采集系统。该系统体积小、线缆少、就近采集、机体共形、安装方便,在MA600全机疲劳试验中进行了应用验证,取得了良好的效果,表明该系统能够满足试验的要求。

面向瘫痪肢体功能康复的无线多通道混合数据采集系统

设计了一款无线多通道混合数据采集系统,包含硬件系统和PC数据采集及分析处理软件系统两部分。硬件系统根据目标需求,通过按键设置体表肌电(sEMG,surface electromyography)信号采集通道数和惯性测量单元(IMU,inertial measurement unit)数量,基于FreeRTOS操作系统创建sEMG信号传输任务和与IMU传感器数量对应的运动学数据采集任务,采用互斥信号量技术确保各任务获取的数据通过Wi-Fi传输给PC软件系统;PC软件系统实现对获取的混合信号实时显示、存储、处理分析等。相比于当下商用Trigno无线基础混合信号采集系统和其他自研系统,所设计的混合数据采集系统在瘫痪肢体运动功能康复领域更实用、具有更强的扩展性。

Machine-vision-based acquisition,pointing,and tracking system for underwater wireless optical communications

Due to the proliferation of underwater vehicles and sensors,underwater wireless optical communication(UWOC)is a key enabler for ocean exploration with a strong reliance on short-range bandwidth-intensive communications.A stable optical link is of primary importance for UWOC.A compact,low-power,and low-cost acquisition,pointing,and tracking(APT)system is proposed and experimentally demonstrated to realign the optical link within 0.04 s,even when the UWOC transmitter and receiver are in relative motion.The system successfully achieves rapid auto-alignment through a 4 m tap water channel with a relatively large number of bubbles.Furthermore,the required minimum illumination value is measured to be as low as7.1 lx,implying that the proposed APT scheme is robust to dim underwater environments.Meanwhile,mobility experiments are performed to verify the performance of the APT system.The proposed system can rapidly and automatically align moving targets in complex and unstable underwater environments,which can potentially boost the practical applications of UWOC.

分布式麦克风阵列拾音理论与应用方法综述

经过数十年的发展,麦克风阵列技术日益成熟,并广泛应用于视频会议、智能电视、移动通话和助听器等人机交互系统。然而,现实噪声或远距离交互场景中,限定阵型结构的传统麦克风阵列的拾音质量难以保证。随着无线智能终端设备的广泛使用,分布式麦克风阵列(或称无线声传感器网络)为提升复杂开放域语音交互系统的拾音质量提供了更多可能性,并在阵列组织、应用体验和声场覆盖度上更有优势。近年来,分布式麦克风阵列在很多语音交互任务上展现出良好的应用潜力,基本实现了对传统麦克风阵列语音任务的全覆盖。本文将重点总结现阶段分布式麦克风阵列的拾音理论和应用方法,包括阵列组织原理、麦克风节点效用评估,以及结合下游语音任务阐述其应用方法。最后,将简要论述分布式麦克风阵列走向实用的关键挑战与发展趋势。

基于自组网协议的箭载无线传感网络系统设计

在火箭舱段环境参数测量中,传统的有线测量方式会增加火箭舱段的整体重量,因此采用无线传感网络代替传统有线测量的方式,对减轻火箭舱段重量具有重大意义。针对以上问题,提出一种基于自组网协议的无线传感网络,基于无线收发芯片CC1310搭建无线传感网络,选用915 MHz频段作为数据传输信道,并设计了自组网协议,网络中的无线传感节点只需和收集器保持相同的静态地址,节点上电后可自动入网,收集器会为每个节点分配独特的动态地址,同时添加CSMA/CA机制防止信道数据冲突,成功应用于此无线传感网络,测试结果表明:在无线传感网络数据传输速率为250 Kbps、信号采样频率为100 SPS的情况下,无线传感节点上电后可自动加入到收集器创建的网络中,并成功按照收集器配置的时间间隔定时上传传感器数据,在10 m范围内无节点数据丢失,最大工作电流19 mA,可满足运载火箭舱段内环境参数的测量需求。

基于无线传输技术的操作过电压采集分析系统

随着电网的快速发展,高压电气的绝缘性能决定了电网可靠性及稳定性,对操作过电压进行采集和分析是科研人员评价高压电气绝缘性能的重要指标之一。针对传统利用示波器方法依赖于有线方式进行波形采集,存在连接测试线繁琐、接地端不良时易发生触电等问题,设计了以兆易创新GD32位微型计算机为核心,基于Zigbee 3.0无线传输技术的操作过电压采集分析系统,解决了原始波形信号在高压电场环境下传输过程中易受外界干扰导致信号失真的难题。依据操作过电压采集结果开展绝缘性能分析,为高压电气设备防雷接地性能评估及电网规划提供一定参考。