Propagation of finite amplitude acoustic waves in layered fluid media : Normal incidence on the layer

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概要

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• Parabolic approximation is effectively used to analyze the nonlinear acoustic field generated by a directive sound source in layered media. Quasi-linear approach and linear boundary condition are applied to obtain the fundamental and second harmonic waves transmitting through a plane interface that separates two media. The interface is placed in nearfield for the harmonic. The spectral contents of sound pressure are measured and compared with the theoretical prediction. Both the results are in good agreement for propagation curves and beam patterns. Transmission loss by insertion of a thick layer across an acoustic beam is also investigated. It is shown that unlike the fundamental wave loss the harmonic loss varies with soource-layer distance. All experiments are conducted in water, methanol and castor oil.

• 社団法人日本音響学会の論文

著者

• KAMAKURA Tomoo

  University of Electro-Communications

• Hasegawa Manabu

  Iwatsu,Electric Co.,Ltd.

• Kumamoto Yoshiro

  University of Electro-Communications

• Hasegawa Manabu

  Iwatsu Electric Co. Ltd.

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• Propagation of finite amplitude acoustic waves in layered fluid media : Normal incidence on the layer
• Improvement of Spatial Resolution for Third Harmonic Detection using a Separately Arranged Transmitting/Receiving Ultrasonic Transducer
• Two Model Equations for Describing Nonlinear Sound Beams

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