Design and Application of Direct Digital Synthesis Excitation Array in Electromagnetic Tomography System

摘要

Electromagnetic Tomography System is a new technique of multidimensional process detection in recent ten years. This subject proposes to use late-model programmable DDS device to design the excitation pilot circuit of EMT sensor excitation array system. The DDS device is controlled by embedded system and the command word of excitation mode is transmitted from the image reconstruction computer by serial communication mode. An excitation array can generate 2 excitation projections, and the flexible circuit excitation system include 8 excitation arrays to produce different excitation field without changing the system's hardware structure.