基于ECT/EST双模成像系统的激励测量模式
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摘要
电荷层析成像(EST)与电容层析成像(ECT)传感器结构类似,便于集成双模成像系统,以拓宽单模态系统的测量范围,提高成像精度。通过设计合理的激励测量策略,即可利用双模态传感器分时测量电容信号与电荷信号,获取足够的有效测量信息,保证重建图像质量。设计合理的C/V,E/V转换电路和多路选通电路,并在FPGA硬件平台上通过软件控制实现ECT与EST信号的分时测量及进行不同激励测量模式的切换,得到更多的有效测量值。模拟实验结果表明:该方法可以实现不同激励测量模式的切换,获取双模态测量信息。
The structure of electrostatic tomography( EST) sensor is similar with electrical capacitance tomography( ECT)sensor,making it convenient to construct ECT / EST dual modality system for the purpose of expanding the measurement range of single modality system and improving the quality of reconstructed images. Capacitance signal and electrostatic signal can be measured by the dual modality sensor at separated time by designing proper exciting-measuring strategies. Design of reasonable E / V,C / V conversion circuit and multi-channel gating circuit,and enough effective measurement information has to be obtained to reconstruct high-quality of images. Through program control on the platform of FPGA,separate-time measurement of ECT and EST signals and exciting-measuring strategy switching were implemented to get more effective measuring values. Experimental results show that the developed method can realize flexible switching between different exciting-measuring strategies,and obtain the desired dual-modality measurement information.
The structure of electrostatic tomography( EST) sensor is similar with electrical capacitance tomography( ECT)sensor,making it convenient to construct ECT / EST dual modality system for the purpose of expanding the measurement range of single modality system and improving the quality of reconstructed images. Capacitance signal and electrostatic signal can be measured by the dual modality sensor at separated time by designing proper exciting-measuring strategies. Design of reasonable E / V,C / V conversion circuit and multi-channel gating circuit,and enough effective measurement information has to be obtained to reconstruct high-quality of images. Through program control on the platform of FPGA,separate-time measurement of ECT and EST signals and exciting-measuring strategy switching were implemented to get more effective measuring values. Experimental results show that the developed method can realize flexible switching between different exciting-measuring strategies,and obtain the desired dual-modality measurement information.
引文
[1]丁振君,王化祥,宋占表,等.容层析成像系统中未知介电常数时测量数据的归一化处理[J].河北大学学报(自然科学版),2005(5):541-544.
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[4]OSMAN-Ali N,NOHAMAD-SALEH J.A study on optimization of electrical capacitance tomography sensor for flow imaging using one-factor-at-a-time approach[C].ITSim2008,2008.
[5]周宾,杨道业,谢利成,等.利用ECT信息改进EST图像重建[J].东南大学学报,2010,40(1):69-74.
[6]陈曦,崔占忠,徐立新,等.静电成像系统的设计[J].北京理工大学学报,2008,28(8):711-714.
[7]张佩宇,姚金杰,刘琪芳,等.柔性激励ECT数据获取系统[J].仪表技术与传感器,2013(2):91-94.
[8]ALME,K J,MYLVAGANAM S.Comparison of different measurement protocols in electrical capacitance tomography using simulations[J].IEEE Transactions on Instrumentation and Measurement,2007,56(6):2119-2130.
[9]王挺,范文茹,郝魁红,等.平面式电容传感器阵列激励模式研究[J].传感器与微系统,2012,31(9):71-74.
[10]张立峰,王化祥,崔自强.数字化电容层析成像系统设计[J].电子质量,2009(4):17-19.
[11]YANG D Y,GUO R,WANG X R,et al.Application of electrical capacitance tomography on lubricating oil film in journal bearings.proceedings of the CSEE,2012,32(5):99-104.
[2]XIE C G,PLASKOWSKI A,BECK M S.8-electrode capacitance system for two-component flow identification part 2:flow regime identification[J].IEEE Proceedings A,1992,1:184-190.
[3]陈德运,陈宇,王莉莉,等.基于改进Gauss-Newton的电容层析成像图像重建算法[J].电子学报,2009,37(4):739-743.
[4]OSMAN-Ali N,NOHAMAD-SALEH J.A study on optimization of electrical capacitance tomography sensor for flow imaging using one-factor-at-a-time approach[C].ITSim2008,2008.
[5]周宾,杨道业,谢利成,等.利用ECT信息改进EST图像重建[J].东南大学学报,2010,40(1):69-74.
[6]陈曦,崔占忠,徐立新,等.静电成像系统的设计[J].北京理工大学学报,2008,28(8):711-714.
[7]张佩宇,姚金杰,刘琪芳,等.柔性激励ECT数据获取系统[J].仪表技术与传感器,2013(2):91-94.
[8]ALME,K J,MYLVAGANAM S.Comparison of different measurement protocols in electrical capacitance tomography using simulations[J].IEEE Transactions on Instrumentation and Measurement,2007,56(6):2119-2130.
[9]王挺,范文茹,郝魁红,等.平面式电容传感器阵列激励模式研究[J].传感器与微系统,2012,31(9):71-74.
[10]张立峰,王化祥,崔自强.数字化电容层析成像系统设计[J].电子质量,2009(4):17-19.
[11]YANG D Y,GUO R,WANG X R,et al.Application of electrical capacitance tomography on lubricating oil film in journal bearings.proceedings of the CSEE,2012,32(5):99-104.