12/2/2023 0 Comments Acoustic doppler effect equationIn 1968, Veselago 7 theoretically predicted that metamaterials 8, 9, 10 with negative refractions 11, 12 can induce the inverse Doppler effect. This phenomenon is applied to several fields, including scientific research, space technology, traffic management and medical diagnosis 3, 4, 5, 6. The Doppler effect refers to a change in frequency of a wave source as a consequence of the relative motion between the wave source and an observer 1, 2. Sound waves are a fundamental vibration mode in nature. It was also shown that inverse Doppler effects can be detected in a flute, which has been popular for thousands of years in Asia and Europe. These omni-directional, double-negative, acoustic metamaterials are constructed with ‘flute-like’ acoustic meta-cluster sets with seven double meta-molecules these metamaterials also overcome the limitations of broadband negative bulk modulus and mass density to provide a region of negative refraction and inverse Doppler effects. Here, we demonstrated a method of designing and experimentally characterising arbitrary broadband acoustic metamaterials. However, the ideal material parameters prescribed by these metamaterial design approaches are complex and also challenging to obtain experimentally. ![]() With the development of metamaterials, inverse Doppler effects have been extensively investigated. Veselago theoretically predicted that materials with negative refractions can induce inverse Doppler effects. ![]() ![]() 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.
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