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Title: Detecting Thermal Cloaks via Transient Effects
Authors: Sklan, S.R
Bai, X 
Li, B
Zhang, X
Keywords: feasibility study
steady state
Issue Date: 2016
Citation: Sklan, S.R, Bai, X, Li, B, Zhang, X (2016). Detecting Thermal Cloaks via Transient Effects. Scientific Reports 6 : 32915. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Recent research on the development of a thermal cloak has concentrated on engineering an inhomogeneous thermal conductivity and an approximate, homogeneous volumetric heat capacity. While the perfect cloak of inhomogeneous ? and inhomogeneous £cp is known to be exact (no signals scattering and only mean values penetrating to the cloak's interior), the sensitivity of diffusive cloaks to defects and approximations has not been analyzed. We analytically demonstrate that these approximate cloaks are detectable. Although they work as perfect cloaks in the steady-state, their transient (time-dependent) response is imperfect and a small amount of heat is scattered. This is sufficient to determine the presence of a cloak and any heat source it contains, but the material composition hidden within the cloak is not detectable in practice. To demonstrate the feasibility of this technique, we constructed a cloak with similar approximation and directly detected its presence using these transient temperature deviations outside the cloak. Due to limitations in the range of experimentally accessible volumetric specific heats, our detection scheme should allow us to find any realizable cloak, assuming a sufficiently large temperature difference. © 2016 The Author(s).
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/srep32915
Rights: Attribution 4.0 International
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