摘要
设计的动态聚焦换能器由6个不同面积等间距、等宽度的同心圆环组成。通过改变每个圆环的激励信号延迟时间和辐射孔径,实现动态聚焦,并且保持聚焦处声强度一致。该聚焦换能器聚焦范围大,在77～157mm之间分6档可调,而不同聚焦处波束宽度在4.0～2.7mm范围变化。通过计算机仿真计算,取得和设计理论一致的结果。
The dynamic focusing transducer consists of six equal step and width annular elements and the center elements.By changing transmission aperture and adjusting delayed time of electric excitation signal applied to every transmission elements,not only can the variable focal length be obtained,but also the same acoustic power can be kept in every focusing position.Focusing range of system has six focal length between 77 mm and 157 mm. Calcaulated results by computer are in good agreement with the theoretical design.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第6期118-120,共3页
Journal of Chang’an University(Natural Science Edition)
