Phononic Crystal Locally-Resonant Cavity for Sensing Metallic Oxides Nano-Powders

Phononic coupled-resonator waveguide cavities are formed by a finite chain of defects in a complete bandgap phononic crystal slab. The sample is machined in a fused silica plate by femtosecond printing to form an array of cross-shape holes. The collective resonance of the phononic cavities, in the Megahertz frequency range, are excited by a piezoelectric vibrator and imaged by laser Doppler vibrometry. It is found that well-defined resonant cavity modes can be efficiently excited, even though the phononic cavities are distant by a few lattice spacings and are only weakly coupled through evanescent elastic waves. The results suggest the possibility of engineering the dynamical response of a set of coupled phononic cavities by an adequate layout of defects in a phononic crystal slab.

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Acoustic wave confinement in two-dimensional phononic crystal with multiple nested resonators

Modern Physics Letters B ◽

10.1142/s0217984919504505 ◽

2019 ◽

Vol 33 (36) ◽

pp. 1950450

Author(s):

Xiao-Peng Wang ◽

Hui Sun ◽

Tian-Ning Chen ◽

Xing-Guo Wang

Keyword(s):

Resonant Frequency ◽

Acoustic Pressure ◽

Phononic Crystal ◽

Resonant Cavity ◽

Acoustic Energy ◽

Frequency Resolution ◽

Signal Frequency ◽

Crystal Resonator ◽

Acoustic Energy Harvesting ◽

Energy Harvesting Efficiency

In this research, a novel phononic crystal (PC) is investigated theoretically to enhance acoustic pressure confinement. It consists of multiple nested resonators based on a tapered configuration. Nested phononic crystal resonator (NPCR) can enhance the acoustic pressure amplification at resonant cavity to a great degree better than the traditional one with same dimensions. The resonant frequency of NPCR is mainly located within outermost phononic crystal resonator’s (PCR) band gap. Meanwhile, it does not move significantly to high frequency with the addition of inner tapered resonators. The enhanced acoustic pressure resonant amplification is attributed to the improvement of the confinement mode owing to the nested structure working as a taper. Then effects of geometrical dimensions of inner PCRs on acoustic confinement are studied. It shows that resonant frequency and resonant acoustic pressure can be affected by the geometric parameters. NPCR has stronger acoustic confinement effects, which are conducive to improve acoustic sensing sensitivity, acoustic signal frequency resolution and acoustic energy harvesting efficiency.

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A lamb wave source based on the resonant cavity of phononic-crystal plates

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control ◽

10.1109/tuffc.2009.1011 ◽

2009 ◽

Vol 56 (1) ◽

pp. 121-128 ◽

Cited By ~ 18

Author(s):

Jia-Hong Sun ◽

Tsung-Tsong Wu

Keyword(s):

Lamb Wave ◽

Phononic Crystal ◽

Resonant Cavity ◽

Wave Source

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Determination of Ethanol Content in Fuels with Phononic Crystal Sensor

Journal of the Russian Universities Radioelectronics ◽

10.32603/1993-8985-2019-22-5-107-115 ◽

2019 ◽

Vol 22 (5) ◽

pp. 107-115

Author(s):

N. V. Mukhin ◽

A. Oseev ◽

M. M. Kutia ◽

E. S. Borodacheva ◽

P. G. Korolev

Keyword(s):

Speed Of Sound ◽

Acoustic Waves ◽

Electrical Contact ◽

Phononic Crystal ◽

Resonant Cavity ◽

Propagation Path ◽

Liquid Hydrocarbons ◽

Ethanol Content ◽

Sensor Structure ◽

Line Analysis

Introduction. In-line analysis of ethanol content in gasoline blends is currently one of the urgent needs of fuel industry. Developing safe and secure approaches is critical for real applications. A phononic crystal sensor have been introduced as an innovative approach to high performance gasoline sensing. Distinguishing feature of proposed sensor is the absence of any electrical contact with analysed gasoline blend, which allows the use of sensors directly in pipelines without the risk of explosion in an emergency.Aim. Investigation of the possibilities of using phononic sensor structures to determine the ethanol content in liquid hydrocarbons.Materials and methods. A theoretical analysis of sensor structure was carried out on the basis of numerical simulation using COMSOL Multiphysics software. For measurement, substances of ordinary gasoline and gasoline 63–80 with ethanol concentrations in the range of 1–10 % by volume in increments of 2 % were prepared. The phononic crystal sensor was designed as a stainless steel plate with cylindrical holes and a resonant cavity, formed as a running across the wave propagation path slit between two lattices.Results. In-line analysis of measuring the concentration of ethanol in alcohol-containing fuels on a phononic crystal structure with a resonant cavity was carried out. Using the Agilent4395A admittance meter, the transmission spectra of longitudinal acoustic waves through the gasoline-filled sensor structure with were obtained. The non-linear correlation between the composition and the speed of sound of the blend is presented in the article is due to the ability to reduce the speed of sound of the mixture with an increase in ethanol concentration in the range of 0–10 % by volume.Conclusion. A measurement structure on the basis of phononic crystal was created. The measurements of various gasoline-ethanol mixtures show that the sensor has significant sensitivity (0.91 kHz/ms−1 ) with quality factor of 200) to distinguish between regular fuels, gasoline based blends and the presence of additives in standard fuels. The sensor has prospects for in-line analyzes the composition of liquid hydrocarbons.

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