Transmission properties of a 1D resonant cavity

Acoustic band gap materials, so-called phononic crystals, provide a new platform for sensing material properties in small cavities. The sensor employs a specific feature of the band gap to determine properties of one component that builds the phononic crystal. The dependence of the frequency within the band gap where transmission takes place due to a resonant mode in the cavity is correlated to material properties. The capability of this concept will be demonstrated with a one-dimensional periodic arrangement of solid plates and liquid filled cavities. The properties of this 1D phononic crystal will be analyzed in terms of its effective acoustic impedance and the resulting transmission properties and experimentally verified.