摘要
铁磁晶体在外磁场中被磁化时,其长度尺寸及体积大小均发生变化,这一现象称为磁致伸缩现象。随着嵌入式系统和现场可编程器件应用的不断普及,利用磁致伸缩及其逆效应产生或接收超声波的技术用于位移(距离)的测量正在国内逐步推广。基于ARM7+FPGA的磁致伸缩超声波位移测量系统,在传统设计的基础上利用FPGA的特点,通过增加数字峰值检测和增益调整电路,使系统可以方便的实现多点测量和量程拓展,同时充分发挥FPGA快速准确测量时间、编程方便灵活和ARM7快速、计算能力强的优势,并且采用实时校正法保证系统的测量准确度。
The magnetoelectric effect is a polarization response to an applied magnetic field, or conversely a magnetization response to an applied electric freld. Along with the application of embedded system and FPGA are increasing popularization, it is spreading that using the ultrasonic caused by magnetoelectric effect to accomplish the displacement measurement. The embedded magnetostrictive ultrasonic displacement measurement system was adopted the design scheme with kernel technique of ARM7 ＋ FleA. It was based upon tradition plan then introduced the idea of testing multi-node synchronously and added circuits of testing digital peak value and regulating gain to extend measurement space. It fully took the advantages of FleA, which can quickly and accurately measure time and program conveniently and flexibly, and the merits of powerful and fast calculation capability of ARMT, meanwhile, introduced the method of ＂real time emendation＂ to ensure the measurement precision of system.
出处
《仪表技术与传感器》
CSCD
北大核心
2007年第8期58-60,71,共4页
Instrument Technique and Sensor
关键词
磁致伸缩超声波测距
现场可编程门阵列
多点测量
实时校正
量程拓展
magnetostrictive ultrasonic displacement measurement
field programmable array
test multi-node synchronously
real time emendation
extend measurement space
