一种基于DDS技术的电磁超声激励电源  

Exciting Source for Electric Magnetic Acoustic Transducer Based on DDS Technology

作　　者：高松巍[1] 李冰[1] 邢燕好[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110178

出　　处：《现代电子技术》2009年第13期5-7,14,共4页Modern Electronics Technique

基　　金：国家支撑计划项目(2006BAJ16B03-02)

摘　　要：为使激发电磁超声的能量转换效率最大化,介绍一种基于直接数字合成(DDS)技术的电磁超声(EMA)激励电源。电源具有脉冲窄,峰值电流大,且重复频率、脉冲频率、脉冲个数、激励时间延迟均可调等特点。详细介绍了DDS信号产生电路、单片机控制电路、功率放大及其与换能器的匹配等硬件和软件。In order to maximize the efficiency of electric/acoustic transformation, a DDS technologybased electrical power source for excitation of Electric Magnetic Acoustic Transducers （EMAT）is described. The electric power source is designed to have following characteristics： narrow pulses, large peak current, adjustable repetition frequency, pulse frequency, numbers of pulses and excitation time delay. The power source consists of DDS based signal generator Micro - controller Unit（MCU）, power amplifier and impedance match circuit to EMAT. Both the hardware and software of the power source are explained in detail.

关 键 词：电磁超声 直接数字合成技术 窄脉冲 阻抗匹配电路 

分 类 号：TN784.1[电子电信—电路与系统]