一种电力光纤实时监测系统设计

提出了一种电力光纤实时监测系统。根据电力光纤环网的特点进行设计,结合OTDR技术和GPRS技术,实现对光纤的实时监测。当光纤有故障发生时,第一时间向工作人员发送报警短信,同时在网站地图上显示故障点位置。实验证明,该系统能在20秒内完成对光纤故障点定位,发送报警短信,以及在地图上显示故障点位置等操作,具有较强的实用性。     

Signal parallel input liquid-crystal devices for multichannel optical processing systems

Variants of liquid-crystal spatial light modulators control devices, that provide partial or fully parallel information input in multichannel optical signal processing systems are suggested. Applications of the proposed solutions enables to increase to a considerable extent the optical processors capacity that is actual for a number of practical problems.     

A decentralized multichannel length transformation algorithm and its parallel implementation for real-time ECG monitoring.

Multichannel algorithms have been developed for more accurate analysis of electrocardiograms (ECGs). Their benefit is the ability to use the information contained in all simultaneously acquired channels. In this paper we present a multichannel version of a nonsyntactic algorithm, based on length transformation. The proposed algorithm uses a decentralized schema for combining the results derived from each individual lead, instead of a global/centralized one (a spatial vector approach). Its performance was evaluated using the CSE database and real ECGs acquired by a 12-lead cardiograph. The results are also compared with previous-single-channel and multichannel-versions of the algorithm, showing a better performance. Since a multichannel algorithm is always a time-consuming task, it is rarely used in real-time monitoring systems. Motivated by this observation, we designed a parallel implementation of the proposed algorithm and tested its ability to be used in such systems.     

雷达接收机多通道高速数据采集系统

介绍了一种用于雷达接收机的多通道高速数据采集系统。该系统以计算机为采集主控单元,兼容多种格式的数据,可以实现多通道的循环采集。系统采集单元由可编程逻辑器件实现,简化了电路结构,增强了系统设计的灵活性和可靠性,降低了体积与成本。实测结果表明该系统工作稳定、性能良好,目前已应用于多个型号的雷达接收机中。     

基于无线射频技术的环氧乙烷浓度监测系统设计

考虑到生产企业技术改造要求,设计一个利用无线射频技术进行非接触的低频双向数据通信系统。它以C8051F220作为核心控制器,以环氧乙烷（C2H4O）气体检测仪做探测节点,通过nRF905无线通信模块,将环氧乙烷气体泄露浓度信息发送给监测终端。系统实现了现场和远程两个监控点同时实时监测功能,提高了生产管理自动化程度,解决了危险特殊场所的有关数据传输和厂区布线困难影响美观等问题。     

A compact finite difference scheme for the fourth-order fractional diffusion-wave system

A high-order compact finite difference scheme combined with the temporal extrapolation technique is investigated for the fourth-order fractional diffusion-wave system in this paper. The solvability, stability and convergence of the scheme are analyzed simultaneously by the energy method. Numerical experiments show that the proposed compact scheme is more accurate and efficient than the Crank–Nicolson scheme.     

光纤网络在线监测管理系统优化设计

针对光纤网络在线监测系统在使用过程中存在诸如创建光路等操作繁琐、告警数据展现不实时、监测设备可扩展性差以及测试数据分析不够准确的问题,采用WebGIS、HTML5和WebSocket等技术对其进行优化改造.系统中增加了通信机,并采用一种基于小波变换动态降噪的方法进行OTDR曲线数据分析,实现了操作可视化、告警数据实时展现、兼容不同协议的监测设备,大幅提升OTDR曲线数据分析的快速性和准确性.     

A high throughput optical system for imaging optodes

The objective of this study was to design a high throughput macro imaging system for intensity ratio based optodes, which facilitate both extensive replication and large number of samples to fulfill the statistical requirements for understanding natural processes occurring over extended time. The suggested system accommodates up to 24 sample cells with a field of view of 35 mm or 12 sample cells and 12 calibration cells for a seamless replacement of the optodes to follow processes that last longer than the optode lifetime. The individual components such as sample turrets, LED light sources, filters and lens designs are tested and discussed in detail. Positioning and alignment of an adjacent cell is completed within 6 s with an accuracy of five pixels. The acceleration profile for the sample turret is software controlled, which makes it possible to study e.g. sediments with overlaying water without effects from re-suspension. Calibration is performed by simultaneous filling of all the flow-cells with calibration solution and thereafter a sample run is executed. Thus, the effort required for calibration is the same regardless of the number of sample cells used. The system is automated and controlled through Matlab (Mathworks Inc), which is also is used for post processing of the images. The system was designed for an environmental application where more than 2000 individual images were collected and calibrated to yield 360 sample images.     

A decision support system for environmental effects monitoring

The Environmental Effects Monitoring (EEM) Statistical Assessment Tool (SAT) Decision Support System (DSS) has been developed to provide a user-friendly data analysis, display and decision support tool for Canada's federal environmental effects monitoring program for the pulp and paper and mining industries. The target users include industries, consultants, regional EEM coordinators, National EEM Office and scientists involved in EEM-related research. The tool allows the assessment of the effects of effluent from industrial or other sources on fish and benthic populations. Effect endpoints, which are used as indicators of potentially important effluent effects, are measured at effluent-exposed sites and are compared statistically to measures at reference sites, in order to determine if changes have occurred and the magnitude of the changes. The main driver of the EEM-SAT DSS is its rule-based expert system. The results are used in assessing the adequacy of existing regulations for protecting aquatic environments.     

A Kinect-based system for cognitive rehabilitation exercises monitoring

In this paper, a 3D computer vision system for cognitive assessment and rehabilitation based on the Kinect device is presented. It is intended for individuals with body scheme dysfunctions and left–right confusion. The system processes depth information to overcome the shortcomings of a previously presented 2D vision system for the same application. It achieves left and right-hand tracking, and face and facial feature detection (eye, nose, and ears) detection. The system is easily implemented with a consumer-grade computer and an affordable Kinect device and is robust to drastic background and illumination changes. The system was tested and achieved a successful monitoring percentage of 96.28%. The automation of the human body parts motion monitoring, its analysis in relation to the psychomotor exercise indicated to the patient, and the storage of the result of the realization of a set of exercises free the rehabilitation experts of doing such demanding tasks. The vision-based system is potentially applicable to other tasks with minor changes.     

PXI多通道瞬态信号测试系统

采用 National Instruments(NI)公司高速示波器和定时模块,对石油行业中的电起爆/点火技术进行了实验研究,开发出一套火工品器件的瞬态时间特性测试系统。基于LabVIEW 高效的软件开发环境和强大功能以及 LabVIEWsignal Processing Toolset 丰富的信号处理函数,结合 PXI-5112和 PXI-6602硬件模块,成功有效地完成了电起爆/点火器件信号的瞬态时间特性的实验测试。     

Parallel multichannel music source separation system

The Journal of Supercomputing - This paper presents a parallel low-latency multichannel source separation system designed to recover the original signals of the instruments that compound a...     

A new implicit compact difference scheme for the fourth-order fractional diffusion-wave system

In this paper, a new implicit compact difference scheme is constructed for the fourth-order fractional diffusion-wave system by the method of order reduction. The temporal Caputo fractional derivative is discretized by an L₁ scheme. The spatial derivative of order 4 is reduced to one of order 2 by order reduction. Then, the reduced derivative of order 2 is discretized by a difference formula of order 4. Using order reduction, two simple and accurate formulae of discretization for the derivative boundary conditions are obtained. And a new way of proving the stability and convergence of the scheme is presented in this paper. Some numerical results demonstrate the accuracy and efficiency of our new scheme.     

一种光纤智能结构的监控系统设计

提出并设计了一种基于光纤智能结构的新型健康监控系统。系统的硬件由光源组、光学系统、光电传感器、监控主机及PC机组成;系统的软件分为监控主机软件和监控计算机软件,监控主机的程序完成光电信号的采集与处理,并负责与PC机通信,进行结构状态分析和创建监控记录。在航空飞行器常用复合材料E51典型试件中,以网状交叉方式埋入特殊传感光纤(间隔为3 cm),构成光纤智能结构,对该结构进行健康监控试验研究,并作数据分析和损伤位置判定。结果表明:该监控系统性能稳定且效果明显,对智能结构多种状态的检测具有实时、有效且可靠的优点,为光纤智能结构的状态监控提供了新方法。     

A compact image encryption system based on Arnold transformation

Multimedia Tools and Applications - A novel compact image encryption system is proposed based on Arnold transformation (AT). In general, AT is a pixel-scramble tool in image encryption, but its...     

Performance investigation of a token passing access protocol for a multichannel optical fibre LAN

An alternative approach to multichannel local area network access is described. The new multichannel access scheme or protocol is based on a token passing arbitration policy. It is specifically intended for use with a starconfigured optical fibre LAN employing wavelength division multiplexing technology in order to provide a multichannel transmission medium. The multichannel network architecture comprises a single reservation channel and several equivalent speed data channels. Delay versus throughput performance characteristics for the network obtained by both analysis and discrete event simulation are shown. The multichannel token passing protocol is found to significantly improve these characteristics in comparison with a conventional single channel token passing approach using the same overall network transmission rate (i.e. the sum of the individual channel bit rates in the multichannel case). Furthermore, when the end-to-end propagation delay for an individual channel on the network becomes large, the multichannel token passing protocol is shown to exhibit an improved delay versus throughput performance over a multichannel protocol employing carrier sense multiple access with collision detection.     

一种预应力监测无线智能螺栓系统

对桥梁、沿土等工程领域的大型结构预应力监测相当重要.大型结构常使用螺栓固定各部件,当大型结构发生倾斜等故障时,螺栓所承载的应力将发生变化.研究设计了一种无线智能螺栓监测系统,可以实时监测这些螺栓所承载的预应力.该无线智能螺栓不仅可以单独使用,还可以组网使用,从而灵活地对大型结构的预应力、结构平衡等进行监测.同时,论述了两种系统工作模式及其算法.     

基于CPCI的车载多通道调试系统

车载设备在开发和调试过程中需要对设备的运行状态进行检测。在车运行状态下实现设备内部变量的检测和调试信号的产生往往比较麻烦。文中提出的车载多通道调试系统是一种基于CPCI总线的嵌入式调试系统,它可以根据系统需求将设备内部变量的状态转换成模拟量信号实时输出,方便对设备工况的检测。同时,车载多通道调试系统可以输出设定波形和频率的调试波形,方便对系统的调试。     

智能旋光检测及远程监控系统设计及应用

依据物理光学方法原理,设计了一款智能旋光检测及远程监控系统。系统应用单片机控制检偏振片运动,用光敏传感器件探测光强,可以准确检测出不同物质的旋光特性。针对目前市场常见的蜂蜜掺假情况,应用本系统进行了实际检测,检测结果可以判断蜂蜜是否掺假及掺假类型。在此基础上设计了一套基于Android和PHP的远程监控系统,实现了对样本检测数据进行远程管理和实时监控。