On the optimal electric loads for ultrasound energy receivers

Gorostiaga, M.; Wapler, Matthias C.; Wallrabe, Ulrike

doi:10.1109/isaf.2017.8000206

Cited by 2 publications

(5 citation statements)

References 8 publications

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“…Finally, the anti-resonances of the three composites are displaced to a lower frequency due to a parasitic 130 pF, which we also observed in previous experiments [13,25,26]. Its origin might be some water leakage in the connecting cables.…”

Section: Measured Versus Predicted Efficiencysupporting

confidence: 78%

Optimizing piezoelectric receivers for acoustic power transfer applications

Gorostiaga¹,

Wapler²,

Wallrabe³

2018

Smart Mater. Struct.

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In this paper, we aim to optimize piezoelectric plate receivers for acoustic power transfer applications by analyzing the influence of the losses and of the acoustic boundary conditions. We derive the analytic expressions of the efficiency of the receiver with the optimal electric loads attached, and analyze the maximum efficiency value and its frequency with different loss and acoustic boundary conditions. To validate the analytical expressions that we have derived, we perform experiments in water with composite transducers of different filling fractions, and see that a lower acoustic impedance mismatch can compensate the influence of large dielectric and acoustic losses to achieve a good performance. Finally, we briefly compare the advantages and drawbacks of composite transducers and pure PZT (lead zirconate titanate) plates as acoustic power receivers, and conclude that 1–3 composites can achieve similar efficiency values in low power applications due to their adjustable acoustic impedance.

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Section: Measured Versus Predicted Efficiencysupporting

confidence: 78%

Optimizing piezoelectric receivers for acoustic power transfer applications

Gorostiaga¹,

Wapler²,

Wallrabe³

2018

Smart Mater. Struct.

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“…In [4], the efficiency of longitudinally resonating rod receiver was higher at the anti-resonance than at the resonance, and we also observed this in [15]. In this paper, the highest efficiency is achieved at 825 MHz between the resonances (see figure 6), but the anti-resonance has a lower efficiency than the resonance.…”

Section: Efficiency At the Resonance And Anti-resonancesupporting

confidence: 65%

“…We have observed the presence of a 130 pF parasitic capacitance and a slight frequency deviation in the experiments, whose origin is unclear. In other experiments [5,15], we saw the same parasitic capacitance value, even though the transducers had different acoustic properties. Furthermore, we also measured the electric impedance of the receiver with the circuit board and the coaxial cable in water, but the antiresonance had the predicted frequency by the model.…”

Section: Parasitic Capacitance and Frequency Deviation In The Measure...supporting

confidence: 51%

“…The emitter model with the viscosity term included can be easily obtained from the model we presented in [6]. By combining the corrected force F and voltage V equations ( 16), (28a) and (28b) of [6] Frequency deviation in the reflection measurements from the optimal load predictions with C par included by the transducer in this manuscript with 0.4 mm thick brass casing (cyan) and that of [15] with 1.1 mm thick brass casing (red).…”

Section: Appendix Analytic Emitter Model With the Viscosity Includedmentioning

confidence: 99%

“…Figure 11. Frequency deviation in the reflection measurements from the optimal load predictions with C par included by the transducer in this manuscript with 0.4 mm thick brass casing (cyan) and that of[15] with 1.1 mm thick brass casing (red).…”

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confidence: 99%

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Analytic model for ultrasound energy receivers and their optimal electric loads II: Experimental validation

Gorostiaga

Wapler

Wallrabe

2017

Smart Mater. Struct.

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In this paper, we verify the two optimal electric load concepts based on the zero reflection condition and on the power maximization approach for ultrasound energy receivers. We test a high loss 1–3 composite transducer, and find that the measurements agree very well with the predictions of the analytic model for plate transducers that we have developed previously. Additionally, we also confirm that the power maximization and zero reflection loads are very different when the losses in the receiver are high. Finally, we compare the optimal load predictions by the KLM and the analytic models with frequency dependent attenuation to evaluate the influence of the viscosity.

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On the optimal electric loads for ultrasound energy receivers

Cited by 2 publications

References 8 publications

Optimizing piezoelectric receivers for acoustic power transfer applications

Optimizing piezoelectric receivers for acoustic power transfer applications

Analytic model for ultrasound energy receivers and their optimal electric loads II: Experimental validation

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