螺旋焊管在线自动测径装置

螺旋焊管在线测径是生产高标准焊管的重要检测装置，可以实时监控钢管管径。选用CCD传感器与计算机连接，组成钢管测径装置，能够较好地达到对钢管管径实时监控的目的。     

多层薄膜结构气敏效应研究

在SnO2气敏薄膜层上覆盖一层或多层钝化材料（SiO2,Al2O3) 薄膜，制成的多层膜气敏元件，可很好地排除大分子气体如乙醇等对小分子H2检测的干扰，使其具有单独检测H2的功能。本文还通过测量元件的升温曲线，推导出敏感体表面的氧吸附活化能；找出活化能与灵敏度、选择性的关系。根据实验现象和物性分析结果，试着探讨了元件的敏感机理。     

基于充放电原理实现的微电容测量电路

具有抗分布电容以及简单实用等特性的充放电电路是目前微电容测量中广泛采用的一种测量电路。本文对基于充放电原理的微电容测量电路进行了深入研究，并介绍一种基于充放电原理的实用电路。     

枪械振动测试用光电六维位移传感器的设计

枪械振动测试包含刚体线位移和角位移六维运动参数.其测试方法是,将光电传感器光源与被测体固结在一起,通过求解光源在三个投影屏上随着被测体运动变化的数学模型而实现的.该传感器由激光器、投影屏、光电探测器件及处理电路、数据采集、数据处理等部分组成.并以固结在被测体上的三个激光器的交点为基点,建立其线位移数学模型;以方向余弦法来确定被测体的角位移,建立其角位移数学模型.     

通用串行总线原理及其外设接口设计

以通用串行总线(USB)1.1为基础,讨论了USB的体系结构、工作原理、通信协议和相应的核心技术,并介绍了一种基于USB接口的数字摄像系统的设计方案及其软件、固件的设计.     

Wireless underground sensor networks: Research challenges

This work introduces the concept of a Wireless Underground Sensor Network (WUSN). WUSNs can be used to monitor a variety of conditions, such as soil properties for agricultural applications and toxic substances for environmental monitoring. Unlike existing methods of monitoring underground conditions, which rely on buried sensors connected via wire to the surface, WUSN devices are deployed completely belowground and do not require any wired connections. Each device contains all necessary sensors, memory, a processor, a radio, an antenna, and a power source. This makes their deployment much simpler than existing underground sensing solutions. Wireless communication within a dense substance such as soil or rock is, however, significantly more challenging than through air. This factor, combined with the necessity to conserve energy due to the difficulty of unearthing and recharging WUSN devices, requires that communication protocols be redesigned to be as efficient as possible. This work provides an extensive overview of applications and design challenges for WUSNs, challenges for the underground communication channel including methods for predicting path losses in an underground link, and challenges at each layer of the communication protocol stack.     

用磁场传感器KMZ52设计的电子指南针

介绍了目前用于定位系统中的电子指南针的工作原理，详细论述了磁场传感器芯片KMZ52的工作原理，给出了用KMZ52磁场传感器设计电子指南针的总体设计方案和电路，同时给出了设计中的一些特殊处理方法。     

黑白CMOS图像传感器0V9120的原理及应用

本文阐述了CMOS图像传感器的一般特征，详细介绍了黑白CMOS图像传感器芯片OV9120的性能、特点及工作原理，给出了OV9120在图像采集处理中的具体应用实例。     

Battery-Aware Routing for Streaming Data Transmissions in Wireless Sensor Networks

Recent technological advances have made it possible to support long lifetime and large volume streaming data transmissions in sensor networks. A major challenge is to maximize the lifetime of battery-powered sensors to support such transmissions. Battery, as the power provider of the sensors, therefore emerges as the key factor for achieving high performance in such applications. Recent study in battery technology reveals that the behavior of battery discharging is more complex than we used to think. Battery powered sensors might waste a huge amount of energy if we do not carefully schedule and budget their discharging. In this paper we study the effect of battery behavior on routing for streaming data transmissions in wireless sensor networks. We first give an on-line computable energy model to mathematically model battery discharge behavior. We show that the model can capture and describe battery behavior accurately at low computational complexity and thus is suitable for on-line battery capacity computation. Based on this battery model we then present a battery-aware routing (BAR) protocol to schedule the routing in wireless sensor networks. The routing protocol is sensitive to the battery status of routing nodes and avoids energy loss. We use the battery data from actual sensors to evaluate the performance of our protocol. The results show that the battery-aware protocol proposed in this paper performs well and can save a significant amount of energy compared to existing routing protocols for streaming data transmissions. Network lifetime is also prolonged with maximum data throughput. As far as we know, this is the first work considering battery-awareness with an accurate analytical on-line computable battery model in sensor network routing. We believe the battery model can be used to explore other energy efficient schemes for wireless networks as well.     

基于运动的摄像机定标方法的综述

该文从运动方式角度将摄像机定标方式分为非限定运动方式和限定运动方式两大类,分别对摄像机各种运动方式对定标技术的影响进行了系统的研究,在应用中应该根据具体情况选择合适的摄像机的运动方式,以满足实际问题的需要。