一种基于数字变频思想的电磁信号产生方法  

A New Current Generating Method Based on Digital Frequency Conversion

作　　者：荣亮亮[1] 林君[1] 朱凯光[1] 

机构地区：[1]吉林大学,长春130026

出　　处：《仪器仪表学报》2005年第z2期1-3,19,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(400127003)资助项目。

摘　　要：针对频率域电磁法探测器需要形成多频电磁信号,提出一种新的电磁信号产生方法。参考数字变频的思想,由计算机模拟发射线圈电流并产生串行二进制数字代码流,控制开关桥路形成PWM电压,在发射线圈中形成电流信号,产生电磁波。该方法适应多种参数发射线圈,电磁信号频率成分可以灵活调整,电路效率可达90%。A new method of generating multi-frequency current is brought forward to improve the efficiency of electro-magnetic detecting. The method consults the idea of the digital frequency conversion, using computer to generate the digital 'bit-stream' and control the switch bridge, generates the PWM wave and finally forms the current wave in the transmitting coil. The new method adapts to varivous transmitting coils and the transmitting frequency is programmable. The efficiency can be as high as 90%.

关 键 词：位流 桥路 信噪比 高速 追赶 浪涌电流 

分 类 号：TH7-55[机械工程—仪器科学与技术]