Sound Source Localization Using Piezoelectric Acoustic Metasurfaces
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ORIGINAL PAPER
Sound Source Localization Using Piezoelectric Acoustic Metasurfaces Jin-Cheng Gu1 · Wei Lin1
· Cai-Xia Kan1
Received: 25 June 2020 / Accepted: 13 September 2020 © Australian Acoustical Society 2020
Abstract Nowadays, the sound source localization is widely applied in various fields, with a focus on arrays or algorithms. Meanwhile, acoustic metasurfaces have recently attracted enormous interest in material science. This paper proposed a kind of piezoelectric acoustic metasurface, whose structure is theoretically proved to be useful in sound field orientation or sound source localization. The metasurfaces consist of forty units made up of a resonance-like cavity and a piezoelectric composite sheet in air. By scanning through space and frequency, it has been investigated that the effective interval can reach 30◦ ≤ θ ≤ 150◦ and −200 ≤ x ≤ 200 cm under far-field and near-field scenario, respectively. Meanwhile, the bandwidth of the structure was evaluated to be up to 800–900 Hz in both scenarios. In addition, this paper analyzed three factors affecting the interval: frequency, the size of the metasurface, and the number of elements. The results of this paper has opened up a new way for sound source localization and metasurfaces. Keywords Sound source localization · Acoustic metasurface · Acoustic array
1 Introduction In the past few years, the sound source localization (SSL) technique received widespread attention due to its rapid development [21]. SSL is the technology of cataloging the position of sound sources based on differences in sound amplitude or phase information at various points in space [22]. It plays an important role in both the civilian and military applications, especially in the subjects of acoustic signal and information processing, telecom system, and software engineering [29,30]. Compared with other forms of signal, SSL is characterized by its low complexity, high efficiency, and great privacy [8]. What’s more, the changes in sound signals are so smooth that can be easily dealt with. Thus, SSL is greatly superior to traditional directions of arrival in many aspects [7]. Phased array transducers are common in SSL [28]. Phased array, namely phase compensation array, is usually composed of microphones as its array units. The accuracy of SSL is closely associated with the arrangement and the number of
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Wei Lin [email protected] Jin-Cheng Gu [email protected]
1
College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
array units [11]. In the case of the fixed arrangement, the accuracy is improved with the increasing number of units. However, the cost of microphone and the support electronics that independently synchronize each of those transducers is a factor limiting the increase in array units. Acoustic metasurfaces have recently attracted enormous interest in the field of materials [1]. The 2-D material with the thickness of subwavelength features dispersed local phase shifts (or amplitude modulation), extraordinary sound absorption, and o
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