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A broad-band constant beam-width array with four elements
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作者 CHEN Guisheng (Shanghai Institute of Testing Technology, Shanghai 200233) 《Chinese Journal of Acoustics》 1993年第1期77-82,共6页
This paper describes in detail an acoustical array structure with four elements that have cosine directivity function over a certain frequency range. The acoustical axis directions of these elements are orthogonal to ... This paper describes in detail an acoustical array structure with four elements that have cosine directivity function over a certain frequency range. The acoustical axis directions of these elements are orthogonal to each other, so their beams cover all bearing angles within 360° . By use of the amplitude bearing method, it is easy to detect the bearing of incident acoustic signal. A special sound reflection foam rubber is designed as a back baffle of the array. It has been shown, in practice, that the constant beam-width has been obtained for a multiple frequency band of the ratio of 8:1. The paper also gives a mathematical model for the array structure. The theoretical values are consistent with the measured results. 展开更多
关键词 acoustical array constant beam-width sound radiation.
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