Optical measurement of acoustic radiation strains in solids

On the acoustic-radiation-induced strain and stress in elastic solids with quadratic nonlinearity (L)

“…Several recent studies have used the acoustic-radiationinduced strain to measure the acoustic nonlinearity parameter. [1][2][3][4][5][6] It is well known that the acoustic-radiation-induced strain is related directly to the static term in the displacement. However, there has been some confusion in the literature regarding the magnitude of the static term in the displacement solution to the nonlinear equation.…”

“…However, there has been some confusion in the literature regarding the magnitude of the static term in the displacement solution to the nonlinear equation. [7][8][9][10] The purposes of this note are (1) to clarify these confusions and (2) to re-interpret the concepts of acoustic-radiation-induced strain and stress.…”

“…where V is a given dimensionless constant on the order of bU 2 k. 2 The solution to Eq. (4) that satisfies the preceding boundary condition and the consistency condition (9) is given by…”