| 摘要 |
PURPOSE:To eliminate a dead zone, and to execute a flaw detection of a body to be inspected, extending over a wide range by arranging a unit vibrating body formed by dividing a piezoelectric vibrator, by dividing it into a transmission exclusive one and a reception exclusive one, and setting its interval to <=1.2 times of a wavelength of an ultrasonic wave. CONSTITUTION:A driving electrode 12 is formed on both main faces of a piezoelectric vibrator 10 formed by dividing a piezoelectric vibrator of about a square shape into plural strip-shaped unit vibrating bodies 11. A folded electrode 13 is extended to one main face side from the other main face through its side face at one end part of the longitudinal direction of the unit vibrating body 11, and as for the divided unit vibrating body 11, a transmission exclusive one 11a and a reception exclusive one 11b are arranged alternately. An interval (dr) of said each unit vibrating body is <=1.2 times of a wavelength of an ultrasonic wave. In this way, the same directional angle as the piezoelectric vibrator having a length of (h-1)dr is obtained, also, it can be prevented that a receiving signal is masked by ringing caused by a fall characteristic of a transmitting pulse, and a dead zone of a body to be inspected can be eliminated. |
