摘要
线列传声器的核心构件是由压电陶瓷圆环作换能元件的一个线列阵,阵元间距小于四分之一波长。建立了传声器方向性函数的表达式,分析了影响方向性图的各个因素,结果表明它具有明显的超指向性和恒定束宽特性。给出了线列传声器几种重要的方向性图及其相应条件。通过对传声器模型所作的试验表明,理论分析与实验数据结果基本上是一致的。本文所提出的技术可使一个传声器能具有不同的方向特性,满足不同使用条件的要求,并且传声器具有结构简单,坚固耐用,性能稳定的优点。
The directivity pattern of the line microphone was studied. The core component of the line microphone is a linear array which is composed of piezoelectric ceramic rings. The element spacing is less than a quarter wavelength. This paper presents the directivity function expression of the microphone, and analyzes the factors which can affect the directivity. The results show that this kind of microphone has characters of super directivity and constant beam width. In this paper, several important directivity pattern and the corresponding condition is given. It can be proved by the experimental data of the microphone, that the results of theoretical analysis and experimental data are consistent. The technology which is proposed may enable a microphone to have the different direetivity characteristic, and satisfy the different exploitation conditions. The microphone has the merit of simple structure, robust and reliable, and stable performance.
出处
《传感技术学报》
CAS
CSCD
北大核心
2008年第12期2026-2030,共5页
Chinese Journal of Sensors and Actuators
关键词
线列传声器
方向性图
恒定束宽
超指向性
line microphone
directivity pattern
constant beam width
super directivity
