用于超音速分离流场参数测量的ECT图像重建算法优化  

Optimization of ECT image reconstruction algorithm for flow field measurement of supersonic separator

作　　者：王世伟 王超 郭琪 丁红兵 Wang Shiwei;Wang Chao;Guo Qi;Ding Hongbing(School of Mechanical and Electrical Engineering,Huainan Normal University,Huainan 232038,Anhui,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Digital Twin Generic Technology in Special Equipment for State Market Regulation(Tianjin Special Equipment Inspection Institute),Tianjin 300192,China)

机构地区：[1]淮南师范学院机械与电气工程学院,淮南232038 [2]天津大学电气自动化与信息工程学院,天津300072 [3]天津市特种设备监督检验技术研究院、国家市场监管重点实验室(特种设备数字孪生共性技术),天津300192

出　　处：《仪器仪表学报》2024年第9期111-119,共9页Chinese Journal of Scientific Instrument

基　　金：安徽省科研编制计划重点项目(2023AH051556);国家自然科学基金项目(52276159,51876143)资助。

摘　　要：针对电容层析成像系统(ECT)用于超音速分离器内气液两相流场参数测量时逆问题病态性导致图像重建质量不高的问题,基于引导图像滤波和正则化理念,提出了一种新的ECT图像重建算法。首先分别利用L_(2)正则化和L_(p)(0<p<1)正则化对介质分布重建,在此基础上,将L_(2)正则化和L_(p)正则化的重构图像分别作为引导图像滤波的引导图和输入图,进行滤波输出。仿真和实验条件下,所提算法、L_(2)正则化算法和L_(p)正则化算法的图像重建结果表明,前者可以同时结合后两种算法的平滑性和稀疏性优势,重构的介质分布更加准确,图像伪影更少。与其它两种方法相比,重建图像平均相关系数分别提高了17.01%和7.15%。所提算法在ECT测量超音速分离器气液两相流场参数方面具有良好应用前景。To address the issue of poor image reconstruction quality caused by the ill-conditioned nature of the electrical capacitance tomography(ECT)system for measuring field parameters of gas-liquid two-phase flow in a supersonic separator,a new ECT image reconstruction strategy is proposed.This strategy combines regularization methods with guided image filtering.First,the media distribution image is reconstructed using L_(2)regularization and L_(p)(0<p<1)regularization methods separately.The reconstructed images from L_(2)regularization and L_(p)regularization are then used as the guide image and input image for guided image filtering(GIF),respectively,to produce the final output.Simulation and experimental results for various models demonstrate that the proposed algorithm effectively combines the smoothness and sparsity benefits of L_(2)and L_(p)regularization methods.This results in a more accurate media distribution reconstruction with fewer image artifacts.The average correlation coefficient of the reconstructed images increased by 17.01%and 7.15%compared to the L_(2)and L_(p)regularization methods respectively.The proposed method shows promising potential for application in measuring field parameters of gas-liquid two-phase flow in supersonic separators using the ECT system.

关 键 词：超音速分离器 图像重建 ECT系统 正则化方法 引导图像滤波 

分 类 号：TH814[机械工程—仪器科学与技术]