Abstract
In the acoustic field of a phase conjugated wave, the sound wave emitted from TRA is converged on the sound source position. Receiving point is put on space between the sound source position and TRA, and the sound wave and the time reversal wave which enter into the point are compared. As a result, the sound wave and the time reversal wave to pass receiving point checked that correlation could be taken. Using these characteristics, a new vertical array is arranged and performs time reversal processing between TRA and a new array. In this manner, it turned out that it is possible to move a focus to the arbitrary positions of the direction of distance.
