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Axisymmetric Condenser Microphone with Electrical Lumping

Application ID: 10731

This model is that of a simple axisymmetric condenser microphone. The model includes all the relevant physics and determines the sensitivity of the specific microphone geometry and material parameters. The model uses a lumped approximation for the electric small signal problem but solves a full FE model for the acoustic-mechanical system. The quiescent (zero point) problem is solved fully using electrostatics and a membrane model.

The model includes:

  1. Thermoacoustics for the acoustics at this small scale
  2. A PDE model of a tensioned membrane
  3. Moving mesh to deform the geometry
  4. Electrostatics to determine capacitance
  5. Circuit model to model electric lumped model (small signal analysis)

This model is included as an example in the following products:

Acoustics Module

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.