CREEM2020

CREEM2020

USE OF SMARTPHONES AS SIGNAL GENERATOR AND DATA ACQUISITION SYSTEM IN A LOW-COST IMPEDANCE TUBE: A PRELIMINARY FEASIBILITY STUDY

Submission Author: Marco Túlio Santana Alves , BA , Brazil
Co-Authors: Edlayan Passos Cunha dos Santos, Marco Túlio Santana Alves
Presenter: Edlayan Passos Cunha dos Santos

doi://10.26678/ABCM.CREEM2020.CRE2020-0137

 

Abstract

The cost of a typical commercial impedance tube is around a few thousand dollars. Given this scenario, this contribution deals with a proposal of a low-cost solution in order to overcome this roadblock, especially in low budget educational institutions. Thus, the main intention of this work is to investigate the feasibility of using smartphones with specific apps playing the role of signal generator and data acquisition system (DAQ), respectively, to be applied to a low-cost impedance tube. Therefore, a low-cost impedance tube system was designed and built from scrap steel tubes and profiles in addition to ordinary components and accessories. It follows that the measuring of sound absorption coefficients is performed based on Transfer Function Method using two microphones according to ISO 10534-2. From the measured signals, all post-processing were carried out in a free scientific language so-called Scilab. Finally, considering the whole context, the results revealed that the measured coefficients were reasonably promising when compared to the values reported by the manufacturer of the commercial sound absorption material used in this work.

Keywords

low-cost impedance tube, sound absorption coefficient, Acoustics, transfer function method, Scilab

 

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