LED光功率源推动的电容传感器的测量电路

将低价格的ＬＥＤ作为光功能源用于光功率推动的传感器，可以极大地降低产品成本，使光纤光功率推动传感器得到更广泛的应用。本文介绍了一种以ＬＥＤ作为光功率源的电容传感器的测量电路及其实验结果。     

气体传感器阵列信号调理电路

一种针对气体传感器阵列中气体传感器信号调理的电路，该电路包括传感器信号程控放大电路和滤波电路。其特征是放大电路采用程控多路开关和运算放大器的组合而成的程控放大，对不同的传感器信号，通过计算机统一控制程控开关，选择不同的通路调节信号放大的倍数；通过在运算放大器输入输出端添加电容防止高频干扰，并在运算放大器的输出端加滤波电路对信号进行滤波，以提高传感器检测精度。     

采集系统中光电信号调理电路的噪声分析

在用数据采集卡对传感器输出信号进行采集的过程中,往往需要先对传感器输出的信号进行放大、滤波、A/D转换等一系列信号调理过程.信号调理电路的噪声直接影响整个检测电路的检测水平,为此,根据光纤电压互感器中光电信号检测的实例,说明了信号调理电路的噪声分析与抑制措施,为以后信号检测精度的提高提供了依据.     

谐振式MEMS磁传感器接口电路设计

介绍了一种谐振式微系统（MEMS）磁传感器的接口电路,电路由驱动电路和信号检测处理电路组成。驱动电路采用直接数字频率合成器（DDS）产生磁传感器驱动信号,同时为检测电路提供同步信号;信号检测处理电路对磁传感器输出信号和 DDS 产生的同步信号进行同步解调,最终得到所需的磁场信号。最后对电路的性能和测试结果进行分析和总结。     

微机械电容式加速度传感器信号电路设计

介绍了一种可用于差动电容敏感的加速度传感器的信号检测电路,给出了在电路中所用的电子元器件,同时进行分析,得到电路的输出电压和传感器信号电容变化量之间的关系.实验结果表明,该电路的线性高,测量差分电容变化的灵敏度好,是一种具有实用价值的微差分电容测量接口电路.     

汽车黑匣子速度信号采集电路的研究与设计

介绍了一种基于霍尔转速传感器的速度信号采集电路,电路主要为汽车行驶状态记录仪提供转速信号,通过对霍尔转速传感器信号进行放大整形,使处理后的信号转换成标准的方波信号。实际功能验证表明,该转速信号完全能满足汽车行驶状态记录仪的设计需要。     

电涡流传感器信号调理电路的设计

介绍一种用于长距离(>30mm)测量的电涡流传感器信号调理电路,详细分析了测量电路的工作原理,给出了电路中有关位置的波形图.     

压力变送器信号调理电路的设计

本文就目前可得到的压力传感器和集成电路片,介绍了压力传感器的信号调理电路的设计。     

用厚膜电路实现阵列触觉信号的采样

阵列触觉的外接引线问题对传感器的制作工艺、信噪比和实际应用都有重要影响.本文介绍了一种用本地厚膜电路实现阵列触觉传感及其采样信号输出的方法,使压阻式点阵、间距为1 mm的触觉传感器仅需6根外接引线.在给出传感器结构制作方法的基础上,对信号采样电路作了详细的阐述,并将各功能电路以厚膜电路的形式集成于传感器上,整个传感器完全实现小型化和外接引线最少化,能方便地应用在多种场合.最后,对传感器的多种性能指标进行了检测和评估.     

基于DSP和光纤光栅传感器称重系统的设计

提出一种利用光纤光栅(FBG)传感器和DSP 芯片控制的称重系统实现方法.分析光纤光栅传感器的结构和原理;结合DSP及信号调理电路完成系统的硬件设计,软件设计方面介绍系统的主程序流程图等.实验表明本系统基本达到设计要求.     

并联预紧式六维力传感器动态力响应分析

提出一种并联预紧式双层结构六维力传感器,介绍了该传感器的结构特点和优点.并基于多自由度系统振动力学对该六维力传感器进行动态力响应分析.首先结合该传感器的结构特点对其进行静力学分析,在此基础上建立了传感器系统的振动力学模型;然后推导出系统的运动微分方程,通过求解运动微分方程,得到了系统在动态力作用下广义坐标的响应以及各分...     

基于石英谐振式力敏传感器的数字式测力系统

提出了一种新型的数字式测力系统的设计方案,该系统以单片机作为中心控制单元,利用了石英谐振器力-频特性,采用了多周期同步法测频、数字滤波等技术,得到了高精度、高稳定性和响应快速的力传感数据,设计简单,工作可靠.     

Lag-Stabilized Force Feedback Damping

A lag-stabilized, force feedback controller for damping initial and residual oscillations of a planar, cantilevered flexible arm has been analytically developed and experimentally implemented on a commercial robot. The controller feeds back force sensor measurements that are delayed in time and proportional to the displacement (angular orientation) of the arm in order to damp the oscillation. As a result of the lag (contrary to popular belief), the controlled robot system is stable and provides tunable performance on a Cincinnati Milacron T3-786 robot.     

A Force of Nature

Our educational system does little to prepare computer science students for making the transition to the working world.     

Digital Library Task Force

In 1995, the IEEE Computer Society established the Task Force on Digital Libraries as a first step leading to a full-fledged Technical Committee. The task force is to promote research in the theory and practice of all aspects of digital libraries. The task force sponsors activities that benefit its members and profession. Such activities include sponsoring and co-sponsoring symposia, sessions in large conferences, tutorials, and a newsletter. The task force co-sponsored the Forum on Research and Technology Advances in Digital Libraries and is co-sponsoring the International Journal of Digital Libraries, published by Springer-Verlag. Membership in the Task Force on Digital Libraries is free     

A Novel Coilless Scanning Mirror Using Eddy Current Lorentz Force and Magnetostatic Force

This paper reports on novel coilless microscanning mirrors driven by the magnetostatic force that resulted from a magnetic interaction as well as the Lorentz force that is induced by an eddy current. This eliminates complicated coil routing and insulation layer deposition and simplifies fabrication allowing easy integration with micromachining and complementary metal-oxide-semiconductor processes. Bulk micromachined one-axis and two-axis scanning mirrors are demonstrated, displaying 1-D and 2-D scanning patterns. Two-dimensional scanning patterns are easily tuned by varying the combination of driving frequencies. The results show that the diamagnetic (Cu) mirror is mainly driven by the eddy-current-induced Lorentz force, whereas the ferromagnetic (Ni) mirror is mainly driven by the magnetostatic force.     

附加力外环的机器人力／位置自适应模糊控制

提出一种由神经网络训练模糊控制规则的自适应模糊控制器,并应用附加力外环的机器人力／位置控制。在不改变一般工业机器人原有位置控制的前提下,实现力／位置自适应模糊控制。实验结果表明,该方法可使机器人控制系统对工作环境接触刚度的自适应能力得到显著改善。     

Active Opening Force and Passive Contact Force Electrostatic Switches for Soft Metal Contact Materials

This paper reports on a mechanically bi-stable, electrostatically actuated switch mechanism with a large active opening force and a small passive closing force, designed to fit the contact and opening force requirements of soft contact materials such as gold. So far, most microelectromechanical systems (MEMS) switch designs have been optimized for a large contact force without paying too much attention to the opening force. In the “conventional,” most commonly used electrostatic microswitch concept, the force of the actuator is used to close the switch contacts, and the switch is opened by the passive restoring force of the deflected cantilever or membrane. This concept results in a large contact force, but the opening force is typically too small to overcome the contact adhesion force of soft metals, which makes this concept less suitable for contact materials such as gold with its low contact resistance at low contact forces. The switch concept presented in this paper is based on two cantilevers laterally moving by curved electrode actuators. The tips of the cantilevers are endowed with hooks which can be mechanically interlocked. In the latched state, the spring forces of the deflected cantilevers also act as the passive contact force between the switch contacts. The opening force is actively created by the curved-electrode actuators, which are utilized close to their best electromechanical operating point resulting in a maximum contact separation force. The theoretical discussion of the new concept as compared to conventional switch designs is supported by simulation results, measurements on fabricated devices, and by an analysis of exemplary switches published in the literature.1735