【摘 要】
：
It is well known that the radiation efficiency of an acoustic dipole is very low,increasing the radiation efficiency of an acoustic dipole is a difficult task,e
【机 构】
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Key Laboratory of Modern Acoustics(Ministry of Education),Institute of Acoustics and School of Physi
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It is well known that the radiation efficiency of an acoustic dipole is very low,increasing the radiation efficiency of an acoustic dipole is a difficult task,especially in an ordinary waveguide.In addition,current acoustic superlenses all utilize in-phase sources to do the super-resolution imaging,it is almost impossible to realize super-resolution imaging of an acoustic dipole.In this paper,after using the Helmholtz resonator arrays (HRAs) which are placed at the upper and lower surfaces of the waveguide,we observe a large dipole radiation efficiency at the certain frequency,which gives a method to observe an acoustic dipole in the far field and offers a novel model which is promising to realize the superlens with a source of an acoustic dipole.We discuss how the arrangement of HRAs affects the transmission of the acoustic dipole.
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