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.
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)
