首页 | 本学科首页   官方微博 | 高级检索  
     检索      

夹心式压电换能器的谐振频率跟踪方案设计
引用本文:李小雪,李平,汪东,肖灵.夹心式压电换能器的谐振频率跟踪方案设计[J].应用声学,2009,28(4):314-320.
作者姓名:李小雪  李平  汪东  肖灵
作者单位:1. 中国科学院声学研究所,北京,100190
2. 北京奥麦特科技有限公司,北京,100190
摘    要:分析了夹心式压电换能器的阻抗特性,讨论了基于相位方式的现有跟踪方案的不足,提出了一种新的频率跟踪方案,介绍了实现该方案的电路系统。该方案的特点是:采用先扫频后跟踪的策略,解决了频率范围设定难的问题;增加解锁控制,使得系统在死锁或误跟踪时自动回到频率搜索状态;采用直接数字合成器(DDS)作为频率调整和信号产生的器件,实现了全数字系统,调整方便,精度高;采用复杂可编程逻辑器件(CPLD)做相位比较和DDS控制,使频率跟踪速度快,并且跟踪精度和速度均可控制。

关 键 词:夹心式压电换能器  频率跟踪  直接数字合成器(DDS)

Resonance frequency tracing scheme for sandwich piezoelectric transducer
LIXiao-Xue,LI Ping,WANG Dong and XIAO Ling.Resonance frequency tracing scheme for sandwich piezoelectric transducer[J].Applied Acoustics,2009,28(4):314-320.
Authors:LIXiao-Xue  LI Ping  WANG Dong and XIAO Ling
Institution:1 (1 Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190) (2 Beijing Ometech Technology Co.,Ltd.,Beijing 100190)
Abstract:This paper analyzes the impedance characteristics of the sandwich piezoelectric transducer,discuses the inadequacy of present frequency tracing schemes using phase locking method.It then proposes a novel scheme,and presents the circuitry that realizes the scheme. The distinguishing features of this scheme are as follows:utilizes a strategy of sweeping frequency before tracing and thus keeps away from the difficulty of settling the frequency tracing band;adds an unlock function which renders the system back to frequency sweeping state in the case of dead-locking or false tracing;uses a direct digital synthesizer(DDS) to adjust the frequency and generate driving signal,thus forms an all-digital system which is convenient to manipulate and can achieve high degree of accuracy;uses complex programmable logic device(CPLD) to detect phase difference and to control DDS,thus achieves high tracing speed and makes the tracing speed and the tracing accuracy controllable.
Keywords:Sandwich piezoelectric transducer  Frequency tracing  Direct digital synthesizer(DDS)
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《应用声学》浏览原始摘要信息
点击此处可从《应用声学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号