Topology optimization of a 3D printed acoustic chamber for photoacoustic spectroscopy

We present here an optimized shape of an acoustical chamber for gaseous photoacoustic spectroscopy needs. Since the relative positioning of the linear sound source -a laser beam- and the microphone presents few symmetry, 3D topology optimization was used here in order to derive non-axisymmetric shapes. The methodology implemented with COMSOL Multiphysics maximizes the retrieved sound pressure at the microphone location and at one desired frequency. Comparison of the performance of the obtained chamber with a conventional cylinder was made afterwards and show promising results.