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为保证电容层析成像(ECT)系统满足航空航天领域多相流参数测试的要求,开发了一套基于CPCI工业总线标准的ECT系统。采用高性能现场可编程门阵列(FPGA)芯片作为主控芯片,实现信号激励模块、多路复用开关模块、数据处理模块、数据解调和传输模块的集成式设计,将采集信号进行预处理,实现信号的滤波、放大和相敏解调,并通过CPCI工业总线接口把解调后的电容数据传送至系统上位机,完成图像重建。实验测试结果表明:系统采用1 MHz激励信号和8电极传感器的工作模式下,采用10周期的测试信号解调时,图像采集速度可达1 785幅/s,信号的信噪比高于60 d B,成像结果具有良好的空间分辨率。
To ensure that the capacitive tomography (ECT) system meets the requirements of multi-phase flow parameter testing in the aerospace field, an ECT system based on the CPCI industrial bus standard has been developed. High-performance field programmable gate array (FPGA) chip is used as the master chip to realize the integrated design of signal excitation module, multiplex switch module, data processing module, data demodulation and transmission module. The collected signals are preprocessed , To achieve signal filtering, amplification and phase sensitive demodulation, and through the CPCI industrial bus interface to the demodulated capacitance data sent to the system host computer to complete the image reconstruction. Experimental results show that when the system uses 1 MHz excitation signal and 8-electrode sensor mode, when the test signal of 10 cycles is demodulated, the image acquisition speed can reach 1 785 frames / s and the signal to noise ratio of the signal is higher than 60 d B, the imaging results have good spatial resolution.