近钻头电阻率随钻测量系统中电流激励源的设计

摘要

发射天线激励是近钻头电阻率随钻测量中的关键技术。文章提出了一种单极性正弦脉宽调制的电流激励源,详细论述SPWM等效面积法的原理,介绍基于数字信号控制器dsPIC33F的SPWM波形的产生方法,并给出了软件流程图。实验结果验证了该设计的可行性。%The excitation of the transmitting antenna is a key technology in near-bit resistivity measurements while drilling.This paper proposes a unipolar sinusoidal pulse width modulated current excitation source;discusses the principle of SPWM equivalent area in detail,introduces SPWM waveform generating method which based on the digital signal controller dsPIC33F and gives software flow chart.The experimental results confirmes the feasibility of the design.