US 12,332,215 B2
Mode conversion reflector
Yoon Young Kim, Seoul (KR); Yu Bin Oh, Seoul (KR); Shin Young Kim, Seoul (KR); and Joong Seok Lee, Daejeon (KR)
Assigned to SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR); CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR); and THE INDUSTRY & ACADEMIC COOPERATION IN CHUNGNAM NATIONAL UNIVERSITY (IAC), Daejeon (KR)
Filed by Seoul National University R&DB Foundation, Seoul (KR); CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR); and The Industry & Academic Cooperation in Chungnam National University (IAC), Daejeon (KR)
Filed on Jan. 10, 2023, as Appl. No. 18/095,112.
Claims priority of application No. 10-2022-0012716 (KR), filed on Jan. 27, 2022.
Prior Publication US 2023/0280313 A1, Sep. 7, 2023
Int. Cl. G01N 29/22 (2006.01); G01F 1/66 (2022.01); G01F 1/667 (2022.01); G01N 29/04 (2006.01)
CPC G01N 29/221 (2013.01) [G01F 1/667 (2013.01); G01F 1/662 (2013.01); G01N 29/04 (2013.01); G01N 2291/0428 (2013.01); G01N 2291/044 (2013.01); G01N 2291/045 (2013.01); G01N 2291/101 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A mode conversion reflector comprising:
an elastic medium; and
a reflective layer formed of a non-planar structure on an edge surface of the elastic medium,
wherein an interference phenomenon caused by diffraction of wave occurs by the reflective layer, so that an ultrasonic wave incident through the elastic medium is mode-converted and reflected in a predetermined direction,
wherein the reflective layer comprises a meta-grating surface structure of a concavo-convex shape having an adjustable plurality of design variables,
wherein the reflective layer is provided with a plurality of convex-shaped protruding structures along a longitudinal direction in a unit structure, and
wherein a length of the unit structure is determined based on a number of modes of a longitudinal wave or a transverse wave diffracted and reflected in the elastic medium, and the unit structure is configured to cancel unwanted modes among the number of modes.