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针对基于圆柱金属腔体的微波断层成像系统,提出了一种利用非均一背景增强系统获取目标信息能力的方法.该方法通过在腔体内放置已知物体构成非均一背景,这样不但能利用背景的先验信息,而且可以增加等效辐射源对目标进行探测.首先,利用矩量法计算圆柱金属腔体内非均一背景的格林函数和离散积分算子,并对离散积分算子进行奇异值谱和条件数分析,在理论上证明该方法的可行性;然后,利用基于有限元的对比源逆成像法对均一背景、有耗非均一背景和无耗非均一背景三种情况进行仿真研究;最后对仿真结果进行了误差分析和比较.仿真结果表明,该方法可以提高反演收敛速度和结果准确度,有耗非均一背景略优于无耗非均一背景.该方法可以在不改变硬件系统和算法的情况下得到更准确的反演结果,可应用于医学成像与工业无损探测.
Aiming at the cylindrical metal cavity-based microwave tomography system, a method of using non-uniform background enhancement system to acquire target information is proposed. The method includes placing a known object in the cavity to form a non-uniform background so that not only the background A priori information and an equivalent radiation source can be added to detect the target.Firstly, the Green’s function and the discrete integral operator of the non-uniform background in a cylindrical metal cavity are calculated by using the moment method, and the singular value spectrum of the discrete integral operator Then the feasibility of this method is proved in theory. Then, the finite element-based contrast source inverse imaging method is used to simulate the homogeneous background, non-uniform background and non-uniform background. Finally, The simulation results show that the proposed method can improve the convergence speed and result accuracy of the inversion, and the lossless heterogeneous background is slightly better than the non-uniform non-uniform background.This method can be used without changing the hardware system and algorithm The more accurate inversion results can be applied to medical imaging and industrial non-destructive detection.