【摘要】 详细论述了扫频式电阻抗断层成像系统设计的关键技术,其中包括激励信号源、恒流源、模拟开关阵列以及信号解调等环节。设计了基于高速混合信号(ISP-FLASH)微控制器的扫频式电阻抗断层成像的数据采集系统。利用高速混合信号(ISP-FLASH)微控制器实现电极选通、数据采集以及与PC机之间的数据通信;PC机作为主控机控制下位机工作,接收测量数据,并进行图像重建。最后总结了存在的问题以及今后发展的研究方向。更多还原

【Abstract】 The key technologies of sweep-frequency electrical impedance tomography system are presented in detail, which consist of the ones for the excitation signal source, constant current source, analog switch array and signal demodulation. A data acquisition system of sweep-frequency electrical impedance tomography based on high-speed composite-signal (ISP-FLASH) MCU is designed. High-speed composite-signal (ISP-FLASH) MCU is applied to electrode gating, data acquisition and data communication with PC. PC is adopted as the master computer to control inferior devices, receive measurement data and perform image reconstruction. The problem and possible way to develop the measurement system are also mentioned.更多还原