摘要
用声聚焦系统获得细声束和高强度的声能,已被广泛地应用于无损检测、医学诊断和军事探测等领域.在声反射聚焦器中,最常见的是球面反射聚焦器,但球面型反射聚焦器存在焦点象差.即焦点位置随入射声束的高度不同而变化,仅当入射声束高度趋于零时焦点象差为零,焦点才恒定.通常,当θ≤30°(图1),即近轴声束入射时,可近似地把焦点视为不变.但是,此条件使聚焦器能接收到的声束宽度大大受到限制,焦点处不能获得很高的声强.本文分析了抛物面型声反射器的特点,
The principal problems of spherical focussing reflector and parabolic focussing reflector are pointed out. A new type of spherical—parabolic—combined acoustic focussing reflector is put forward. Its face—shape equation is defined. A numerical calculation formula for focused sound field of the new reflector is derived This may be important for obtaining high intensity sound field
出处
《陕西师大学报（自然科学版）》
CSCD
1993年第3期85-87,共3页
Journal of Shaanxi Normal University(Natural Science Edition)
关键词
组合型
声反射
聚焦器
sound reflection
new type
focussing reflector
pressure distribution
