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Measurements of Non-Interacting Angle in the Scattering of Sound by Sound for Gases

Non-interacting angle at which the nonlinear interaction between two crossing waves does not occur is investigated. In the time domain, a new approach to derive the non-interacting angle which depends on the nonlinearity parameter of medium is presented. The exact treatment of the angle-dependent parameter for the nonlinear interaction is carried out. To measure the non-interacting angle, the phase modulation of a probing wave of 40 kHz is observed. The experimental results for gaseous medium of air, freon, or argon show good agreement with the theoretical prediction.