摘要
本文对新研制的一种复频聚焦超声换能器的辐射声场进行了实验研究，测定了辐射声压在轴向上的分布曲线，进而确定了焦区位置，这与理论所得结果符合得较好。测定了辐射声压在焦平面上的分布曲线，并对焦区声场进行了定标。最后对换能器在水中焦区辐射声场的频谱进行了研究，不仅观测到了两个源波，而且还观测到了和频波、差频波以及倍频波，证实了声散射声效应的存在。
This paper studies experimentally the sound field radiated in water by a bi-frequency ultrasonic focused transducer we designed, and the distribution curve of the axial pressure of the individual single frequency component is measured. Each focal area is determined and is found to be in good agreement with the theoretical result. Then the distribution curve of pressure on the focal plane of the bi-frequency transducer is measured. Finally the spectrum of the focal acoustic field is investigated. Not only the two original waves but also waves with the sum frequency, difference frequency and multiple frequencies are detected, which testifies to the existence of scattering of sound by sound.
出处
《应用声学》
CSCD
北大核心
2001年第4期27-30,20,共5页
Journal of Applied Acoustics
基金
国家自然科学基金资助项目(批准号:19874042)
