Acoustic probe 100 in the acoustic transmitter includes the variable refraction acoustic lens 10 which is connected 20 which includes the plural acoustic sensing elements which are arranged with array of 1 dimensions, and the acoustic transmitter. The variable refraction acoustic lens, it is impressed in the whole electrode responding to the voltage which is selected, in order to adjust the focus of the variable refraction acoustic lens, electrode has 150 of the deck which is adapted and 160 at least. In one execution example, the variable refraction acoustic lens, the 1st and 2nd fluid medium includes the electrode of 141 which is arranged inside the cavity and the cavity, 142 and the deck. Speed of sound of the sound wave in 1st fluid medium differs from the speed of sound of the sound wave in 2nd fluid medium. 1st or 2nd fluid medium to blend mutually, 1st fluid medium has the conductance which differs from 2nd fluid medium substantially.音響プローブ100は、1次元のアレイで配置された複数の音響変換素子を含む音響変換器20、及び音響変換器に結合する可変屈折音響レンズ10を含む。可変屈折音響レンズは、電極全体に印加される選択された電圧に応答して可変屈折音響レンズの焦点を調整するように適応される少なくとも一組の電極150, 160を持つ。一実施例において、可変屈折音響レンズは、キャビティ、キャビティ内に配置される第1及び第2流体媒体141, 142並びに一組の電極を含む。第1流体媒体中の音波の音の速さは、第2流体媒体中の音波の音の速さとは異なる。第1及び第2流体媒体は互いに混ざり合わず、第1流体媒体は、第2流体媒体と実質的に異なる導電率を持つ。
