2014
DOI: 10.1038/srep07421
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Sound Pressure Level Gain in an Acoustic Metamaterial Cavity

Abstract: The inherent attenuation of a homogeneous viscous medium limits radiation propagation, thereby restricting the use of many high-frequency acoustic devices to only short-range applications. Here, we design and experimentally demonstrate an acoustic metamaterial localization cavity which is used for sound pressure level (SPL) gain using double coiled up space like structures thereby increasing the range of detection. This unique behavior occurs within a subwavelength cavity that is 1/10th of the wavelength of th… Show more

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Cited by 38 publications
(14 citation statements)
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“…The NPAS covered the entire voice spectrum up to 8 kHz by combining the improved piezoelectric properties of inorganic membrane and resonance bands of multi-channel, showing higher sensitivity than capacitive microphone in the high frequency region. The frequency response was measured in the free field condition of anechoic chamber with the white noise (a mixture of frequencies with equal intensity) at 94 dB SPL, which could obtain the electrical output signals without external noise and wave reflection 60 . The relative sensitivity of NPAS was plotted by acquiring the highest electrical signal among seven channels.…”
Section: Multi-resonant Characterization Of Npasmentioning
confidence: 99%
“…The NPAS covered the entire voice spectrum up to 8 kHz by combining the improved piezoelectric properties of inorganic membrane and resonance bands of multi-channel, showing higher sensitivity than capacitive microphone in the high frequency region. The frequency response was measured in the free field condition of anechoic chamber with the white noise (a mixture of frequencies with equal intensity) at 94 dB SPL, which could obtain the electrical output signals without external noise and wave reflection 60 . The relative sensitivity of NPAS was plotted by acquiring the highest electrical signal among seven channels.…”
Section: Multi-resonant Characterization Of Npasmentioning
confidence: 99%
“…Input white noise is defined as a mixture of broadband frequencies with identical intensity. An anechoic chamber with acoustic absorbent was used to inhibit external noise and wave reflection when measuring the electrical signals in a free-field condition ( 39 ). The frequency response of PMAS was plotted by selecting the highest relative sensitivity among seven channels via a dynamic signal acquisition (DSA) system.…”
Section: Resultsmentioning
confidence: 99%
“…We have proposed and demonstrated a helical-structured acoustic metamaterial, which enables dispersion-free slow wave propagation with a compact structure. Such metamaterials with large mass density are very desirable in many useful applications, such as implementing deep sub-wavelength resonant unit cells 43 and boosting the radiation efficiency of sound sources 44 .The helicity-dependent refractive index of the metamaterials also provide a new way to passively engineer the phase of acoustic waves that will benefit the applications such as acoustic imaging and communication 13 14 15 16 , acoustic cloaking 42 45 46 47 48 and particle manipulation 49 and so on. A one-dimensional meta-lens has been constructed to test the hypothesis.…”
Section: Discussionmentioning
confidence: 99%