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Figure 9.

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Admittance and resonant modes of the Tonpilz transducer in air under different excitation methods. (a) Admittance of the transducer under in-phase excitation. (b) Admittance of the transducer under anti-phase excitation. (c) Admittance of the transducer under partial excitation. (d) Amplified admittance curve under 34.6 kHz anti-phase excitation.

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