Performance Analysis of Cost-Effective Miniature Microphone Sound Intensity 2D Probe.

Witold Mickiewicz,Arkadiusz Parus,Michał Raczyński

doi:10.3390/s20010271

Witold Mickiewicz, Arkadiusz Parus + Show 1 more

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https://doi.org/10.3390/s20010271

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Abstract

This article presents the functional properties of modified versions of the 2D pressure–pressure intensity probe allowing us to determine the vector of sound intensity on a plane using a mechatronic system with one or two miniature electret microphones. The introduction contains basic information about the application areas of the sound intensity and its measurement problems. Next, the principle of operation of the probes and the construction of the prototype measurement system are described. It was subjected to comparative analysis for the stability of obtained results and accuracy of directional characteristics in free field conditions. For this purpose, experiments were conducted to analyze the flow of acoustic power in an anechoic chamber using both (one- and two-microphone) probes. The results were used for a comparative metrological analysis of the described methods and to indicate the advantages and disadvantages of both constructions. The next part of the article presents an experiment concerning the measurement of the sound intensity impulse response of a room, which is an example of practical use of the probe to analyze reflections in the room, which can be used in sound engineering and architectural acoustics.

Highlights

Localization of acoustic energy sources and visualization of the vector distribution of the acoustic field around them have, on the one hand, cognitive applications and, on the other hand, many practical applications
The valuesThis of sound intensity are presented, which on the basisexperiment of measured values of pressures part of the article presents the results of the described in acoustic the previous were paragraph
The main novelty of the proposed single-microphone methodby is to the multi-sensor simultaneous measurement of pressure gradient components a replace sequential single-sensor simultaneous of pressure gradient components a sequential single-sensor measurement. measurement

Summary

Introduction

Localization of acoustic energy sources and visualization of the vector distribution of the acoustic field around them have, on the one hand, cognitive applications and, on the other hand, many practical applications. The most important applications are: localization of noise sources, measurement of acoustic power in the presence of interference [1], support for voice communication systems, spatial sound engineering in audiovisual systems [2], acoustic localization of threats in security systems, and many others [3]. For this reason, it is important to develop commonly available acoustic sensors that enable the above-mentioned functionalities to be realized. This bionic approach to the spatial location of sound sources is widely used to produce spatial sound recordings (various types of two- and multi-microphone systems) [4,5]

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