title: Development of explicit diffraction corrections for absolute measurements of acoustic nonlinearity parameters in the quasilinear regime.
abstract: In absolute measurements of acoustic nonlinearity parameters, amplitudes of harmonics must be corrected for diffraction effects. In this study, we develop explicit multi-Gaussian beam (MGB) model-based diffraction corrections for the first three harmonics in weakly nonlinear, axisymmetric sound beams. The effects of making diffraction corrections on nonlinearity parameter estimation are investigated by defining "total diffraction correction (TDC)". The results demonstrate that TDC cannot be neglected even for harmonic generation experiments in the nearfield region.
authors.affiliation: Division of Mechanical and Automotive Engineering, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea. Electronic address: hjjeong@wku.ac.kr.
authors.forename: Hyunjo
authors.initials: H
authors.lastname: Jeong
authors.affiliation: School of Traffic and Transportation Engineering, Central South University, Changsha, Hunan 410075, China.
authors.forename: Shuzeng
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Division of Mechanical and Automotive Engineering, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea.
authors.forename: Sungjong
authors.initials: S
authors.lastname: Cho
authors.affiliation: School of Traffic and Transportation Engineering, Central South University, Changsha, Hunan 410075, China.
authors.forename: Xiongbing
authors.initials: X
authors.lastname: Li
keywords: Diffraction correction; Multi-Gaussian beam; Nonlinearity parameter; Quasilinear theory