Fundamental research on non-destructive testing of reinforced concrete structures using sub-terahertz reflected wavesChihiro Kobayashi, Tomoya Nishiwaki, Shoumi Hara, Tadao Tanabe, Takahiro Oohashi, Hitoshi Hamasaki, Shuya Hikishima, Akio Tanaka and Koji AritaMATEC Web Conf., 378 (2023) 04007DOI: https://doi.org/10.1051/matecconf/202337804007