文章摘要
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].,2009,28(4):314-320
夹心式压电换能器的谐振频率跟踪方案设计
Resonance frequency tracing scheme for sandwich piezoelectric transducer
  
中文摘要:
      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。
英文摘要:
      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.
DOI:10.11684/j.issn.1000-310X.2009.04.013
中文关键词: 夹心式压电换能器  频率跟踪  直接数字合成器(DDS)
英文关键词: Sandwich piezoelectric transducer  Frequency tracing  Direct digital synthesizer(DDS)
基金项目:国家自然科学基金(基金批准号60673152)资助
作者单位
李小雪 中国科学院声学研究所 
李平 中国科学院声学研究所 
汪东 北京奥麦特科技有限公司 
肖灵 中国科学院声学研究所 
摘要点击次数: 1183
全文下载次数: 157
查看全文   查看/发表评论  下载PDF阅读器
关闭