| Autor: |
Alejandro Ortega-Aguilar, Augusto García-Valenzuela, Roberto Velasco-Segura, G. Eduardo Sandoval-Romero |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Proceedings of Meetings on Acoustics. |
| ISSN: |
1939-800X |
| DOI: |
10.1121/2.0001408 |
| Popis: |
In this work we investigate an efficient method for calculating the reflected and transmitted acoustic fields from diffracting ultrasound beams incident to a gas/gas interface. The study is motivated by the application to gas sensors of an experimental setup consisting of a 40 kHz acoustic incident beam at oblique angles to an interface separating two gases. The numerical method consists of performing a plane wave expansion of the incident beam using standard Fourier transform methods. Expressions for the reflected and transmitted acoustic fields are obtained in terms of integrals of simple kernels. These can be performed numerically in a straightforward way. The main approximation in this method comes from guessing the acoustic pressure field at a plane just in front of the ultrasonic emitter. We compare calculations of this Plane Wave Expansion Method (PWEM) with finite element method simulations in a 2D geometry, finding good qualitative agreement. Among the advantages of the PWEM we have that there is no need to calculate the whole acoustic fields in a large volume, compared to the wavelength of the frequency used, while still considering rigorously diffraction effects. We present calculations for airborne ultrasound reflection measurements of interest in developing novel acoustic gas sensors. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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