基于波束形成麦克风阵列的空气超声信号定位

Q2 Physics and Astronomy

Advances in Acoustics and Vibration Pub Date : 2019-02-11 DOI:10.1155/2019/7691645

A. Movahed, Thomas Waschkies, U. Rabe

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引用次数: 3

摘要

无损检测方法用于检查和测试材料和部件的不连续性或机械特性的差异。相控阵信号处理技术已广泛应用于各种领域，但对无源阵列非接触无损检测的研究较少。本文介绍了用无源合成传声器阵列进行波束形成技术分析，计算超声频率范围内声波的来源和强度。在可听到的频率范围内工作的声学摄像机是众所周知的。为了在更高的频率下进行测量，必须考虑麦克风阵列的排列。这种排列方式对阵列的特性有很大的影响，比如它的波束方向、动力学和对空间混叠的敏感性。在仿真的基础上，对直径为20 cm的16、32和48个传声器进行了优化配置，并在实际实验中对75 kHz信号频率下的声源进行了定位。结果表明，研制超声摄像机对超声声源定位是有益的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Air Ultrasonic Signal Localization with a Beamforming Microphone Array

Nondestructive testing methods are used to inspect and test materials and components for discontinuities or differences in mechanical characteristics. Phased array signal processing techniques have been widely used in different applications, but less research has been conducted on contactless nondestructive testing with passive arrays. This paper presents an application of beamforming techniques analysis using a passive synthetic microphone array to calculate the origin and intensity of sound waves in the ultrasonic frequency range. Acoustic cameras operating in the audible frequency range are well known. In order to conduct measurements in higher frequencies, the arrangement of microphones in an array has to be taken into consideration. This arrangement has a strong influence on the array properties, such as its beam pattern, its dynamics, and its susceptibility to spatial aliasing. Based on simulations, optimized configurations with 16, 32, and 48 microphones and 20 cm diameter were implemented in real experiments to investigate the array resolution and localize ultrasonic sources at 75 kHz signal frequency. The results show that development of an ultrasonic camera to localize ultrasonic sound sources is beneficial.

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来源期刊

Advances in Acoustics and Vibration ACOUSTICS-

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期刊介绍： The aim of Advances in Acoustics and Vibration is to act as a platform for dissemination of innovative and original research and development work in the area of acoustics and vibration. The target audience of the journal comprises both researchers and practitioners. Articles with innovative works of theoretical and/or experimental nature with research and/or application focus can be considered for publication in the journal. Articles submitted for publication in Advances in Acoustics and Vibration must neither have been published previously nor be under consideration elsewhere. Subject areas include (but are not limited to): Active, semi-active, passive and combined active-passive noise and vibration control Acoustic signal processing Aero-acoustics and aviation noise Architectural acoustics Audio acoustics, mechanisms of human hearing, musical acoustics Community and environmental acoustics and vibration Computational acoustics, numerical techniques Condition monitoring, health diagnostics, vibration testing, non-destructive testing Human response to sound and vibration, Occupational noise exposure and control Industrial, machinery, transportation noise and vibration Low, mid, and high frequency noise and vibration Materials for noise and vibration control Measurement and actuation techniques, sensors, actuators Modal analysis, statistical energy analysis, wavelet analysis, inverse methods Non-linear acoustics and vibration Sound and vibration sources, source localisation, sound propagation Underwater and ship acoustics Vibro-acoustics and shock.