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Speaker That Uses the Non-linearity in Air to Create Sound (Mechanical Project)

The aim of this work was to investigate theoretically and experimentally the fact that it is possible to create sound by using the nonlinearity in air. A speaker was built verifying the theory that if at least two high frequencies at high amplitude is propagating through a nonlinear medium, for example air, the difference frequency of these two is created in mid air. Measurements and simulations were performed on what the pressure distribution from a ultrasonic transducer looks like.

Introduction:
Often when one thinks about creating sound one thinks about a speaker that uses a piston movement to create the sound. This way of creating sound is not the only way. The audible sound can be created in midair by using ultrasound and the non-linearity in air.
Source: Blekinge Institute of Technology
Author: Fredin, Johan

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