Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/214477
Title: AUDIBLE SOUND SENSING ENHANCEMENT VIA STRUCTURAL COUPLED DESIGNS OF BROADBAND METAMATERIAL
Authors: JIA XIAO
Keywords: Acoustics, metamaterial, signal-to-noise ratio, transmittance, broadband, impedance-matching
Issue Date: 18-Aug-2021
Citation: JIA XIAO (2021-08-18). AUDIBLE SOUND SENSING ENHANCEMENT VIA STRUCTURAL COUPLED DESIGNS OF BROADBAND METAMATERIAL. ScholarBank@NUS Repository.
Abstract: Acoustic sensors play an important part in military, scientific, and industrial applications. Current audible sound sensing performance is mainly limited by the minimum detectable pressure of the sensor material and the energy transmission efficiency of the metamaterial component. A practical solution is to enhance the detection limit of an audible sensing device with additional amplification components and bring in impedance matching designs for high-refractive-index metamaterials containing complex internal structures. In the thesis, impedance-gradient metamaterials with structural coupled designs (SCDs) are developed and investigated to increase the overall energy efficiency and improve the audible sound sensing ability of a measurement device. Moreover, by applying SCDs, the quarter-wavelength acoustic resonator and the anisotropic sonic crystals can realize broadband sound pressure amplification. The two metamaterial-enhanced sensing systems provide broadband improvements of signal-to-noise ratio (SNR) with incident signals below the detection limit of the measurement devices.
URI: https://scholarbank.nus.edu.sg/handle/10635/214477
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
JiaX.pdf16.97 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

26
checked on Sep 22, 2022

Download(s)

4
checked on Sep 22, 2022

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.