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Photoacoustic Resonator

Application ID: 12435


This is a model of a simple photoacoustic (or optoacoustic) resonator. A pulsating laser heats a gas causing expansion and contraction and thus creates pressure waves. Such devices are used as sensors for measuring material parameters of the gas inside the resonator. The resonance frequency of the system depends on the gas in the resonator.

The model uses the Thermoviscous Acoustic, Frequency Domain interface with a heat source domain feature to include the heat generated by the pulsating laser. The thermoviscous acoustic interface is well suited for this type of application as it solves the full linearized equations for a compressible fluid including the energy equation.

This application was built using the following:

Acoustics Module

The combination of COMSOL® products required to model your application depends on the physics interfaces that define it. Particular physics interfaces may be common to several products (see the Specification Chart for more details). To determine the right combination of products for your project, you should evaluate all of your needs in light of each product\'s capabilities, consultation with the COMSOL Sales and Support teams, and the use of an evaluation license.