Highly directional acoustic receivers
Highly directional acoustic receivers
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DOI：
10.1121/1.1543851
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发表时间：
2003-03-01
影响因子：
2.4
通讯作者：
Nuttall, AH
中科院分区：
文献类型：
--
作者：
Cray, BA;Evora, VM;Nuttall, AH
本文提出了一种可以在同一位置测量多个声场量的单组合声接收器的理论指向性。该公式是使用泰勒级数展开的声压。笛卡尔坐标系的原点例如，由二阶组合接收器（表示为二元传感器）测量的量是声压、声粒子速度的三个正交分量以及速度矢量的九个空间梯度。幂级数展开，它可以是任何顺序，被铸造成一个表达式，定义了一个单一的接收元件的方向性。它示出了一个单一的高度定向的二元，传感器可以具有高达9.5 dB的方向性指数。然而，使用高度定向的传感器是要付出代价的;这些传感器对非声学噪声源可能更加敏感。(C)2003年，美国声学学会。
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 elements 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. (C) 2003 Acoustical Society of America.