| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic sound velocity measuring method capable of easily measuring with no trouble by use of only a longitudinal wave perpendicular probe. SOLUTION: This measuring method is as follows. A longitudinal wave perpendicular probe 10 is abutted on a side face of a cylindrical sample 14 to make ultrasonic waves incident in the cylinder from the side face, while detecting an echo B1 accompanied by no mode conversion (i.e., the waves transmitting from longitudinal wave perpendicular probe 10 within the sample 14 as longitudinal waves, then reflected on the side face of the cylinder to return to the longitudinal wave perpendicular probe 10) and an echo N3' accompanied by a mode change (i.e., the waves transmitting from the longitudinal wave perpendicular probe 10 within the sample 14, reflected on the side face of the cylinder, and returning to the longitudinal wave perpendicular probe 10 through a transmission path of an inscribed isosceles triangle of the circular outline of the cylinder, as changed from the longitudinal waves to transverse waves, and from the transverse waves to the longitudinal waves in every reflection). A longitudinal wave sound velocity CL is calculated from a transmission time of the echo B1 accompanied by no mode change, a transmission time ratio of the echo N3' accompanied by the mode change is calculated, and a sound velocity ratio (x) and a transverse wave sound velocity Cs are calculated from the transmission time ration that is a function of only a sound velocity ratio x=CS/CL. |
