基于改进AD7606的电阻抗层析成像系统设计与验证

Design and Verification of Electrical Impedance Tomography System Based on Improved AD7606

针对目前电阻抗层析成像系统存在检测精度低、采集电压动态范围大、不能准确识别待测区域目标体等问题,提出以改进的差分放大电路作为AD7606的前处理模块,相比传统的模数采集,减少了系统的共模噪声和其他干扰。为了实现快速高效的计算机仿真,提出一种基于极坐标下的有限差分计算方法,并且实现了基于Tikhonov正则化算法的动态电阻抗层析成像。仿真试验验证了数据采集系统的性能和成像效果,表明该系统能够准确识别待测区域单目标体的位置信息。

To solve the problems of low detection accuracy,large dynamic range of acquisition voltage,and inability to prepare for identifying target bodies in the test area in current electrical impedance tomography systems,an improved differential amplification circuit is proposed as the pre-processing module of AD7606.Compared with traditional AD acquisition,it reduces common mode noise and other interference in the system.In order to achieve fast and efficient computer simulation,a finite difference calculation method based on polar coordinates is proposed,and dynamic electri-cal impedance tomography imaging based on Tikhonov regularization algorithm is implemented.The simulation experiment verifies the performance and imaging effect of the data acquisition system,indicating that the system can accurately iden-tify the position information of a single target in the test area.