Inverse Doppler Effects in Broadband Acoustic Metamaterials.

ABSTRACT: The Doppler effect refers to the change in frequency of a wave source as a consequence of the relative motion between the source and an observer. Veselago theoretically predicted that materials with negative refractions can induce inverse Doppler effects. With the development of metamaterials, inverse Doppler effects have been extensively investigated. However, the ideal material parameters prescribed by these metamaterial design approaches are complex and also challenging to obtain experimentally. Here, we demonstrated a method of designing and experimentally characterising arbitrary broadband acoustic metamaterials. These omni-directional, double-negative, acoustic metamaterials are constructed with 'flute-like' acoustic meta-cluster sets with seven double meta-molecules; these metamater

SUBMITTER: Zhai SL 

PROVIDER: S-EPMC5006168 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature