浮法玻璃气泡产生的原因及解决办法

通过对浮法生产玻璃的工艺研究,探讨玻璃中气体的存在形式及气泡产生的原因,并结合生产实际来研究解决气泡问题的办法,达到提高浮法玻璃生产质量的目的.     

DOUBLE LOOP ACTIVE VIBRATION CONTROL OF PNEUMATIC ISOLATOR WITH TWO SEPARATE CHAMBERS

A newly designed pneumatic spring with two separate chambers is promoted and double-loop active control is introduced to overcome the following drawbacks of passive pneumatic isolation: (1)The low frequency resonances introduced into the system; (2)Conflict between lower isolation frequency and stiffness high enough to limit quasi-static stroke; (3) Inconsistent isolation level with different force load. The design of two separate chambers is for the purpose of tuning support frequency and force independently and each chamber is controlled by a different valve. The inner one of double-loop structure is pressure control, and in order to obtain good performance, nonlinearities compensation and motion flow rate compensation (MFRC) are added besides the basic cascade compensation, and the influence of tube length is studied. The outer loop has two functions: one is to eliminate the resonance caused by isolation support and to broaden the isolation frequency band by payload velocity feedback and base velocity feed forward, and the other is to tune support force and support stiffness simultaneously and independently, which means the support force will have no effect on support stiffness. Theoretical analysis and experiment results show that the three drawbacks are overcome simultaneously.     

低功耗非接触式射频读写器的设计与实现

本文通过对影响系统功耗各种因素的分析,以MSP430和MFRC522为主要芯片,从硬件选择和软件设计两方面同时考虑,提出了一套适应低功耗需求的射频读写器设计方案.     

高精度数据采集放大器AD522及其应用

AD522是AD公司推出的高精度数据采集放大器,利用它可在恶劣工作环境下获得高精度数据。文中介绍了其主要特点,给出了AD522的典型应用电路,并对AD522在特殊应用情况下的漂移、增益、共模拟制比的调整方法作了说明,最后还指出了AD522的误差形成原因及调整方法。     

移动式13.56MHz RFID读卡器的设计

设计了一种基于Zigbee无线技术的移动式RFID读卡器,给出了移动式读卡器的原理框图,详细阐述了射频芯片CC2420、读卡集成芯片MFRC522和主控芯片MSP430F1611的外围电路,以及整个读卡器的软件构架。读卡器采集标签数据,通过ZigBee网络自动的发送这些数据到服务器。移动式读卡器减少了RFID系统网络布线,节约了成本,使用更加方便灵活。     

新一代Mifare射频基站IC MF RC522在水表中的应用

介绍了Philips公司最新推出的Mifare非接触IC卡读写芯片MFRC522的主要特性、引脚功能和基本指令集;简述以MSP430系列超低功耗16位单片机为内核的水表设计以及与MFRC522的硬件接口电路设计;重点阐述了MSP430对MFRC522的读写控制流程。     

基于MFRC500芯片的RFID读写器开发

给出了用PHILIPS的MFRC500芯片对13．56MHz频段的RFID读写器进行设计开发的具体方案和电路原理图，同时根据ISO14443A标准给出了RFID读写器控制协议的软件设计流程，最后对本RFID读写器设计开发中的一些经验进行了总结。     

基于MFRC522的RFID读卡器设计

设计了一种基于MFRC522的读卡器,工作频率为13.56MHz,读取支持ISO14443A标准的射频卡片.给出系统硬件设计原理图,研究MFRC522发射电路中滤波、天线阻抗匹配和接收三部分电路元件值的确定方法.分析电路中电容元件的封装尺寸和材质对射频信号收发的影响,提出PCB天线的设计要求.阐述系统软件控制流程.捕捉并分析读卡器和射频卡之间收发信号的波形图.测试结果显示天线周围无金属物时的读卡距离最高可达60 mm,电路的稳定性和可重复性优良.