| 摘要 |
<p>The array vibrators are grouped into a number of sections (K1, K2, K3, K4) by a section selector, the sections are so selected as will be overlapped on the neighbouring portions (K12, K23, K34) so that the ultrasonic scaning will not be lost between the neighbouring sections. The array vibrators on the overlapping portions are switched to pertain to one section at some moment and to pertain to the other section at other moments, in order to carry out the ultrasonic wave scanning. The ultrasonic wave scanning is carried out by, first, simultaneously exciting the array vibrators (101 to 108), (1033 to 1040), (1065 to 1072), (1097 to 10104) to emit four ultrasonic wave beams (B1), (B33), (B65), (B97) such that the reflected waves will be incident on the array vibrators that are excited. Then, excitation of the array vibrators is shifted to a position deviated by one pitch, and the scanning is successively effected in the direction of arrow.</p> |
