指向性
声学
质点速度
声压
声功率
笛卡尔坐标系
噪音(视频)
泰勒级数
系列(地层学)
物理
计算机科学
数学
电信
地质学
几何学
数学分析
人工智能
天线(收音机)
图像(数学)
声音(地理)
古生物学
作者
Benjamin A. Cray,Victor M. Evora,Albert H. Nuttall
出处
期刊:Journal of the Acoustical Society of America
[Acoustical Society of America]
日期:2003-02-28
卷期号:113 (3): 1526-1532
被引量:63
摘要
The theoretical directivity of a single combined acoustic receiver, a device that can measure many quantities of an acoustic field at a collocated point, is presented here. The formulation is developed using a Taylor series expansion of acoustic pressure about the origin of a Cartesian coordinate system. For example, the quantities measured by a second-order combined receiver, denoted a dyadic sensor, are acoustic pressure, the three orthogonal components of acoustic particle velocity, and the nine spatial gradients of the velocity vector. The power series expansion, which can be of any order, is cast into an expression that defines the directivity of a single receiving element. It is shown that a single highly directional dyadic sensor can have a directivity index of up to 9.5 dB. However, there is a price to pay with highly directive sensors; these sensors can be significantly more sensitive to nonacoustic noise sources.
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