Focal length of the acoustic lens in the air -- CFD Online Discussion Forums

May 11, 2023, 15:25

Focal length of the acoustic lens in the air

vezd

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I'm trying to simulate in COMSOL (Acoustic-Solid Interaction, Frequency Domain) an acoustic solid lens in the air. Frequency 100 kHz. The radius of curvature of the lens is 50 mm. I assume that the focal length F will be greater than the radius of curvature of the lens F > R=50 mm. But the focal length is about 40 mm in the model . Why is the focal length less than the radius of curvature of the lens?

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