US 12,366,558 B2
Ultrasonic transmission device and wave control method
Yoon Young Kim, Seoul (KR); and Chung Il Park, Chungcheongnam-do (KR)
Assigned to SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR); and CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR)
Appl. No. 17/637,754
Filed by SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR); and CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR)
PCT Filed May 31, 2021, PCT No. PCT/KR2021/006722
§ 371(c)(1), (2) Date Feb. 23, 2022,
PCT Pub. No. WO2021/242063, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 10-2020-0065393 (KR), filed on May 29, 2020.
Prior Publication US 2022/0291176 A1, Sep. 15, 2022
Int. Cl. G01N 29/34 (2006.01); A61B 8/00 (2006.01); G01N 29/04 (2006.01)
CPC G01N 29/34 (2013.01) [G01N 29/04 (2013.01); A61B 8/00 (2013.01); G01N 2291/023 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An ultrasonic transmission apparatus for performing an ultrasonic inspection by injecting an ultrasonic wave into an object including a medium and a body to be inspected inside and including an obstacle outside, the ultrasonic transmission apparatus comprising:
an ultrasonic generation device configured to generate an incident wave; and
an ultrasonic transmission module located between the obstacle and the ultrasonic generation device and located on a travel path of an incident wave generated by the ultrasonic generation device,
wherein the ultrasonic transmission module comprises:
an ultrasonic transmission member, and
a position variable device configured to vary a position of the ultrasonic transmission member, and
wherein the ultrasonic transmission member selectively varies impedance and a phase,
a ratio α between a phase of the obstacle and a phase of the ultrasonic transmission member and a ratio β between impedance of the obstacle and impedance of the ultrasonic transmission member are defined according to following Equation (1),

OG Complex Work Unit Math
where z=ρc (ρ: density c: wave velocity),
Φ=kd (k: wavenumber, d: thickness of dissimilar material),
k=ω/c=(ω: frequency [Rad/s]),
ω=2πf (f: frequency [Hz]),
the subscript ‘B’ indicates the obstacle, and the subscript ‘L’ indicates the ultrasonic transmitter.