多激励模式下的电容层析传感器优化设计

Optimal Design of Electrical Capacitance Tomography Sensor Based on Multiple Excitation Modes

针对电容层析成像(ECT)系统中传感器采集信号微弱,边缘化效应严重,介电常数变化不明显等问题,提出了一种基于多激励模式下的ECT传感器优化设计方案,该方案在优化了传感器物理参数的同时采用相邻双电极激励模式进行检测,增加了敏感场强度,在一次测量过程中可以获得更多的电容值,有效增加了传感器采集信号数量与采集精度。实验结果表明,优化后的ECT传感器能有效提高激励信号强度,减弱边缘化效应,改善传感器内部灵敏度矩阵,提高采集信号精度,图像重建质量明显提高。

Aiming at the problems of weak sensor acquisition signal,serious marginal effect,and insignificant change in dielectric constant in the electrical capacitance tomography(ECT)system,an optimized design scheme of ECT sensor based on multiple excitation modes is proposed.This scheme optimizes the physical parameters of the sensor and adopts adjacent double the electrode excitation mode is used for detection,which increases the intensity of the sensitive field,and obtains more capacitance values in a measurement process,which effectively increases the number of signals collected by the sensor and the acquisition accuracy.The experimental results show that the ECT sensor with multiple excitation modes can effectively increase the excitation signal strength,reduce the marginal effect,improve the internal sensitivity matrix of the sensor,increase the accuracy of the acquisition signal,and significantly improve the image reconstruction quality.