Bimorph Resonator

The bimorph resonator has the following geometry;

The arrows represent the sample poling directions. The resonance is generated by applying a field opposite to the polling directions of the top and bottom halves. One half then contracts while the other extends which causes the bimorph to bend. The limits in dimension should ensure that the resonance will be free of coupling with other resonance modes.

The resonance observed in the sample admittance is described by the following equation;

By fitting this equation to the observed resonance, the following material properties can be determined;

k₁₃, e^T₃₃, a, EI.

a is the flexural rigidity of the bimorph while EI is the product of the bulk Young's Modulus and the area moment of inertia.

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