| 摘要 |
PROBLEM TO BE SOLVED: To shorten reverberation time of an ultrasonic wave 25 that is multiply reflected on a surface of an object 2 to be measured, and to accurately measure a reflection wave from inside the object 2 to be measured.SOLUTION: An ultrasonic wave measuring device comprises: a propagating medium 3 that is immersed in an acoustic medium 6, and comes into contact with a first front surface of an object 2 to be measured; an ultrasonic wave transmitting element 10a that transmits an ultrasonic wave reaching inside the object 2 to be measured via the acoustic medium 6 and the propagating medium 3; and an ultrasonic wave receiving element 10b that receives an ultrasonic wave 27 reflected inside the object 2 to be measured via the acoustic medium 6 and the propagating medium 3. An acoustic impedance (Z) of the propagating medium 3 is greater than an acoustic impedance (Z) of the acoustic medium 6, and smaller than an acoustic impedance (Z) of the objet 2 to be measured.SELECTED DRAWING: Figure 2 |
