An Experimental Setup for the Calibration of Acoustic Antenna
An Experimental Setup for the Calibration of Acoustic Antenna
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DOI：
10.1109/tim.2013.2295656
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发表时间：
2014-01
影响因子：
5.6
通讯作者：
O. Petrella;S. Ameduri;V. Quaranta;G. Betta;M. Laracca
中科院分区：
文献类型：
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作者：
O. Petrella;S. Ameduri;V. Quaranta;G. Betta;M. Laracca
声学天线最常见的应用之一是声源的检测和定位。传感器的几何分布并不是影响测量的唯一参数；麦克风的机电特性也起着重要作用，强烈影响信号的延迟。因此，考虑传感器的几何位置及其内在特征的专用校准过程可以提高测量的准确度。在本文中，提出了一种专用校准方法，提供了位置的全局测量，综合了上述所有延迟原因。传感器检测到的声学信号用于确定它们与参考麦克风的距离；在此基础上，通过三角测量方法，计算出它们的位置。首先，在模拟环境中调整校准方法：使用专用数值模型研究声源和参考麦克风位置的影响，从理论上预测每个麦克风产生的信号。采用专用优化过程来确定布局配置，保证大尺寸天线的正确校准，并与消声室可用空间限制兼容。所提出的解决方案在线性形状声学天线上进行了实验测试。
One of the most common applications of the acoustic antennas is the detection and the localization of sources. The geometric distribution of the sensors is not the only parameter that influences the measure; also the electromechanical features of the microphones play an important role, strongly affecting the delay of the signals. For this reason, a dedicated calibration process, considering both the geometric location of the sensors and their intrinsic features, can increase the accuracy level of the measure. In this paper at hand, a dedicated calibration method is proposed, providing a global measure of the locations, comprehensive of all the above mentioned causes of delay. The acoustic signals detected by the sensors are used to determine their distances from a reference microphone; on this basis, through a triangulation method, their locations are computed. First, the calibration method was tuned in a simulation environment: the effect of the location of sound sources and reference microphone was investigated using a dedicated numerical model to theoretically predict signal produced by each microphone. A dedicated optimization process was adopted to identify layout configuration guaranteeing the right calibration also for large size antenna compatibly with anechoic room available space constraint. The proposed solution was experimentally tested on a linear shape acoustic antenna.