Formation of Spherical Waves by Restriction of Plane Waves

摘要

Disclosed is a method of forming a spherical wave by superimposing a limited plane wave, which is located behind an actual linear transducer and has an energy center in which a plurality of limited plane waves overlap. Transmitting, by the actual linear transducer, a planar wave equivalent to a limited plane wave transmitted from the virtual linear transducer introduced to prevent concentration; And forming a spherical wave by superimposing the plurality of limited plane waves. Since the spherical wave forming method forms a spherical wave having a large size by using several elements, the spherical wave can be extended to a long distance and has an advantage of improving a signal-to-noise ratio. In addition, the spherical wave forming method according to the present invention can be implemented by transmitting a wave with a time difference to each device when the linear transducer currently used is a linear time invariant (LTI).