Sound localization in an anisotropic plate using electret microphones

Sabzevari, Seyed Amir Hoseini; Moavenian, Majid

doi:10.1016/j.ultras.2016.09.004

Cited by 23 publications

(1 citation statement)

References 25 publications

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“…Such as solving nonlinear equations, 7,8 beamforming technique, 9-11 minimizing error functions, 12-15 deep learning, 16,17 time reversal, 18-20 manual training data, 21-23 and attenuation analysis. 24 Kundu et al 25,26 first proposed a technique using “L”-shaped sensor clusters for ASL in an anisotropic plate. This technique neither requires a priori knowledge of the properties of the material nor any solution of nonlinear equations.…”

Section: Introductionmentioning

confidence: 99%

A fast approach for acoustic source localization on a thin spherical shell

Zhou

Cui

Kundu

2021

Structural Health Monitoring

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Thin spherical shell structures are wildly used as pressure vessels in the industry because of their property of having equal in-plane normal stresses in all directions. Since very large pressure difference between the inside and outside of the wall exists, any formation of defects in the pressure vessel wall has a huge safety risk. Therefore, it is necessary to quickly locate the area where the defect maybe located in the early stage of defect formation and make repair on time. The conventional acoustic source localization techniques for spherical shells require either direction-dependent velocity profile knowledge or a large number of sensors to form an array. In this study, we propose a fast approach for acoustic source localization on thin isotropic and anisotropic spherical shells. A solution technique based on the time difference of arrival on a thin spherical shell without the prior knowledge of direction-dependent velocity profile is provided. With the help of “L”-shaped sensor clusters, only 6 sensors are required to quickly predict the acoustic source location for anisotropic spherical shells. For isotropic spherical shells, only 4 sensors are required. Simulation and experimental results show that this technique works well for both isotropic and anisotropic spherical shells.

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Section: Introductionmentioning

confidence: 99%

A fast approach for acoustic source localization on a thin spherical shell

Zhou

Cui

Kundu

2021

Structural Health Monitoring

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Charge Distribution and Stability of SiO₂ Nanoarray Electret

Liang

Wang

et al. 2020

ChemNanoMat

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The devices based on SiO 2 electret have significant applications in various MEMS sensors. However, the charge stability of SiO 2 electret suffered from the water percolation, which seriously restricts its application. In this work, the longterm charge stability of the SiO 2 nanoarray electret (SiO 2 NAE) without any water repellent treatment is demonstrated. When the oxidation time is 1.5 h, the potential decay of the SiO 2 NAE is less than 46% during 60 days with an original potential of À 120 V. The long-term charge stability of the SiO 2 NAE is attributed to its unique charge decay process and the large H 2 O diffusion barrier in the SiO 2 NAE: firstly, the charge trapped in the planar part of the SiO 2 NAE decays rapidly. Then, residual charge stored in the SiO 2 nanoarray. Eventually, the large H 2 O diffusion barrier in the interface of Si/SiO 2 effectively hinders the charge decay. In addition, we demonstrate the unique charge stability of nanoelectret, which has a promising application in developing high performance electret-based devices.An electret is a kind of insulator that exhibits a quasi-permanent source of electric field. Due to the trapped electret charges, it has been widely used in MEMS devices such as energy harvester, [1][2] various transducer [3][4][5] and microphones. [6] Among all the electret materials, SiO 2 show the great potential in fabricating high performance MEMS devices because of the high dielectric strength and the compatibility in CMOS processing. However, the trapped Communication

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Challenges in sound source localization on complex plate structures

Hoseini Sabzevari

2024

J Braz. Soc. Mech. Sci. Eng.

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Sound localization in an anisotropic plate using electret microphones

Cited by 23 publications

References 25 publications

A fast approach for acoustic source localization on a thin spherical shell

A fast approach for acoustic source localization on a thin spherical shell

Charge Distribution and Stability of SiO₂ Nanoarray Electret

Challenges in sound source localization on complex plate structures

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Sound localization in an anisotropic plate using electret microphones

Cited by 23 publications

References 25 publications

A fast approach for acoustic source localization on a thin spherical shell

A fast approach for acoustic source localization on a thin spherical shell

Charge Distribution and Stability of SiO2 Nanoarray Electret

Challenges in sound source localization on complex plate structures

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Charge Distribution and Stability of SiO₂ Nanoarray Electret