电子器件2018，Vol.41Issue(2)：454-459,6.DOI:10.3969/j.issn.1005-9490.2018.02.034
基于NIR-AOTF的超声换能器阻抗特性分析及驱动系统设计
Impedance Analysis and Driving System Design of Ultrasonic Transducer Based on NIR-AOTF
摘要
Abstract
Based on the impedance characteristics of the piezoelectric ultrasonic transducer,an NIR-AOTF drive system based on the high-speed single-chip microcomputer and the direct digital frequency synthesizer(DDS)was designed on the research basis of the input impedance and matching network of the transducer. Using the software look-up table method,the voltage amplitude control characters of each frequency drive signal were made into a table and stored in the single chip computer that realized the DDS in the various bands of constant power output. And a new broadband impedance matching network was applied to the piezoelectric transducer,Finally,the S21>-0.276 dB and the S11<-10.173 dB in the range of 30 MHz~80 MHz bandwidth.Because the driving circuit provided power at 36 dBm,experiments showed that the power of transducer is higher than 35 dBm,which achieves the 3 W~4 W power requirement of ultrasonic transducer in actual operation,and the maximum diffraction efficiency of the 0-stage spectrum of NIR-AOTF is up to 73%.关键词
阻抗变换/NIR-AOTF/射频驱动/衍射效率Key words
impedance transformation/NIR-AOTF/RF drive/diffraction efficiency分类
通用工业技术引用本文复制引用
康曦,任勇峰,单彦虎,赵成城..基于NIR-AOTF的超声换能器阻抗特性分析及驱动系统设计[J].电子器件,2018,41(2):454-459,6.基金项目
国际科技合作专项项目(2013FDR10150) （2013FDR10150）
