Optimization of in-plane directional microphone
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This report is aimed at optimization of the in-plane directional microphone. In chapter 1, a piezoelectric network model is presented. Then the network model is applied to a piezoelectric cantilever beam. Theoretical results are compared with simulation results to prove the network model. This piezoelectric cantilever beam also forms the basis of the XY directional microphone. In chapter 2, principles of XY directional microphone are explained at the beginning. Further analysis shows the expression related to signal-to-noise ratio, which is the optimization goal. ANSYS simulation is implemented to justify this expression. Based on that expression, suggestions are made to optimize the directional microphone. In chapter 3, proof of concept of a novel gyroscope directional microphone is explained. Gyroscopic effect is introduced at first. Then the result of in-plane directional microphone is presented. Finally, the expression for "amplification factor" is derived and selection of appropriate performance criterion could lead to improved sensitivity.