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Enhanced approximate cloaking by SH and FSH lining.
- Source :
-
Inverse Problems . Jul2012, Vol. 28 Issue 7, p1-21. 21p. - Publication Year :
- 2012
-
Abstract
- We consider approximate cloaking from a regularization viewpoint introduced in Kohn et al (2008 Inverse Problems 24 015016) for EIT and further investigated in Kohn et al (2010 Commun. Pure Appl. Math. 63 0973-1016) and Liu (2009 Inverse Problems 25 045006) for the Helmholtz equation. The cloaking schemes given by Kohn et al and Liu are shown to be (optimally) within | ln ρ|-1 in 2D and ρ in 3D of perfect cloaking, where ρ denotes the regularization parameter. In this paper, we show that by employing a soundhard layer right outside the cloaked region, one could (optimally) achieve ρN in RN, N ≥ 2, which significantly enhances the near-cloak. We then develop a cloaking scheme by making use of a lossy layer with well-chosen parameters. The lossy-layer cloaking scheme is shown to possess the same cloaking performance as the one with a sound-hard layer. Moreover, it is shown that the lossy layer could be taken as a finite realization of the sound-hard layer. Numerical experiments are also presented to assess the cloaking performances of all the cloaking schemes for comparisons. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02665611
- Volume :
- 28
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Inverse Problems
- Publication Type :
- Academic Journal
- Accession number :
- 79470137
- Full Text :
- https://doi.org/10.1088/0266-5611/28/7/075011