基于DAC的电阻层析成像系统激励信号源设计  

Design of excitation signal for electrical resistance tomography system based on DAC

作　　者：李改利[1] 赵娟[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《电子测试》2011年第12期86-90,共5页Electronic Test

摘　　要：为了解决传统电阻层析成像系统中激励信号源的问题,如电路的频率、幅值调节困难,电路设计模块复杂等问题,本文设计了一种新的电阻层析成像激励信号源产生系统。该系统利用微控器控制DAC芯片产生幅度频率可调的激励信号,该信号驱动精密电压/电流转换电路后产生双极性脉冲电流激励信号。研究表明,此系统可以满足使用要求,同时,在一定程度上该系统简化了激励信号产生模块的复杂度,降低了系统硬件设计的难度和经济成本,具有一定的实用性和推广价值。In order to solve the shortcomings of the traditional excitation signal of Electrical Resistance Tomography system, such as the amplitude and frequency hardly adjusted, the complex design modules in circuits and so on, a new system of excitation signal for Electrical Resistance Tomography is designed in this paper. Under the control of microcontroller, the pulsed voltage whose phase and amplitude can be digitally controlled is produced by DAC chip. The voltage signal drives the precision current-to-voltage circuits to generate the bi-directional pulse current source. Research shows that the system can meet the requirements of practical application. At the same time, the system can simplify the complex of the excitation signal module and reduce the difficulty and economic cost of the hardware. To a certain degree, the technology and methods adopted in the system are practical and worthy of using abroad.

关 键 词：电阻层析成像(ERT) DAC 激励信号源 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN741[自动化与计算机技术—计算机科学与技术]