| 摘要 |
PURPOSE:To provide a method of ultrasonic flaw detection in which the ultrasonic wave that can converge itself at a medium II through a medium I is carried by the transverse ultrasonic wave. CONSTITUTION:A 1 indicates a vibrator, 2 a medium I as a sound binding agent, 3 a medium II as a material to be tested, and 5 a focal point, respectively. The vibrator 1 is made of a piezoelectric ceramic material, and cuts a hollow sphere at its parallel two planes, far farming annularity. The vibrator I is submerged in the medium (I) 2 or a sound binding agent, for example water, and the medium (II) 3, a material to be tested, is irradiated with ultrasonic wave at a specified incident angle, larger than a longitudinal wave critical angle, emitted from the annular sphere, so that a focal point 5 of converged beam is formed at a specified position in the medium (II) 3. |
