<i>Underwater Acoustics</i>

Camp, L. W.; Farwell, Robert W.

doi:10.1063/1.3070689

Cited by 5 publications

(4 citation statements)

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“…In our new physical model, we use the compression/tension deformation of a uniform rod (sheet) to describe the rear surface fixation and the front surface radiation of the thickness polarization thin-wafer transducer. By carrying this out, the above six-terminal machine-electrical equivalent circuit of Mason and KLM was simplified into a four-terminal equivalent circuit similar to but different from Camp's thin ring piezoelectric transducer, noting that Camp's equivalent circuit does not contain two frequency-related mechanical components, namely radiation resistance and radiation mass [63].…”

Section: Discissions and Concluding Remarksmentioning

confidence: 99%

A Frequency-Dependent Dynamic Electric–Mechanical Network for Thin-Wafer Piezoelectric Transducers Polarized in the Thickness Direction: Physical Model and Experimental Confirmation

Fa,

Liu,

Gong

et al. 2023

Micromachines

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This paper is concerned with electric–acoustic/acoustic–electric conversions of thin-wafer piezoelectric transducers polarized in the thickness direction. By introducing two mechanical components with frequency-dependent values, i.e., radiation resistance and radiation mass, into the equivalent circuit of the thin-wafer piezoelectric transducer, we established a frequency-dependent dynamic mechanic-electric equivalent network with four terminals for an arbitrary given frequency, an enhancement from the conventional circuit networks. We derived the analytic expressions of its electric–acoustic and acoustic–electric conversion impulse responses using the four-terminal equivalent circuit to replace the traditional six-terminal equivalent circuit for a thin-wafer transducer with harmonic vibrational motion. For multifrequency electrical/acoustic signals acting on the transducer, we established parallel electric–acoustic/acoustic–electric conversion transmission networks. These two transmission network models have simple structures and clear physical and mathematical descriptions of thin-wafer transducers for electric–acoustic/acoustic–electric conversion when excited by a multifrequency electric/acoustic signal wavelet. The calculated results showed that the transducer’s center frequency shift relates to its mechanical load and vibration state. The method reported in this paper can be applied to conventional-sized and small-sized piezoelectric transducers with universal applicability.

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Section: Discissions and Concluding Remarksmentioning

confidence: 99%

A Frequency-Dependent Dynamic Electric–Mechanical Network for Thin-Wafer Piezoelectric Transducers Polarized in the Thickness Direction: Physical Model and Experimental Confirmation

Fa,

Liu,

Gong

et al. 2023

Micromachines

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“…Ref. [24] gives the relation between particle displacement and strain for the tangentially polarized thin cylindrical piezoelectric transducer as follows…”

Section: Electric-mechanical Equivalent Network For Tangentially Polarized Thin Cylindrical Piezoelectric Transducersmentioning

confidence: 99%

Numerical Simulation and Experimental Verification of Electric–Acoustic Conversion Property of Tangentially Polarized Thin Cylindrical Transducer

Kong

Gong

et al. 2021

Micromachines

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In solving piezoelectric equations of motion, we established an electric–acoustic equivalent circuit of tangentially polarized thin cylindrical transducers and derived analytical expressions of the electric-acoustic response from the harmonic driving-voltage excitation. To experimentally verify the findings, we manufactured a parallel electric-acoustic transmission network for transducers excited by multifrequency driving signals. We found that the tangentially polarized thin cylindrical transducers achieved a much higher electric-acoustic conversion efficiency than the radially polarized thin cylindrical transducers. The electric-acoustic impulse response of the transducers consisted of a direct-current damping with lower-frequency components, a damping oscillation with higher-frequency elements, and a higher resonant frequency of the transducer over its center frequency. The characteristics of radiated acoustic signals included contributions from the geometrical shape and size of the transducer, the physical parameters of piezoelectric material, the type of driving-voltage signals, and the polarization mode of the transducers. In comparison, our theoretical predictions are in good agreement with experimental observations. It is plausible that using the tangentially polarized thin cylindrical transducers as sensors in the acoustic-logging tool may significantly improve the signal-to-noise ratio of the measured acoustic-logging signals.

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“…(1) which occurs at ka sin 1:22 and the following equation is obtained for the half beamwidth angle [23]:…”

Section: Acoustic Re¯ectionmentioning

confidence: 99%

Estimation of object location and radius of curvature using ultrasonic sonar

Sekmen

Barshan

2001

Applied Acoustics

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Acoustic sensors are very popular in time-of-¯ight (TOF) ranging systems since they are inexpensive and convenient to use. One of the major limitations of these sensors is their low angular resolution which makes object localization dicult. In this paper, an adaptive multisensor con®guration consisting of three transmitter/receiver ultrasonic transducers is introduced to compensate for the low angular resolution of sonar sensors and improve the localization accuracy. With this con®guration, the radius of curvature and location of cylindrical objects are estimated. Two methods of TOF estimation are considered: thresholding and curve-®tting. The bias-variance combinations of these estimators are compared. Theory and simulations are veri®ed by experimental data from a real sonar system. Extended Kalman ®ltering is used to smooth the data. It is shown that curve-®tting method, compared to thresholding method, provides about 30% improvement in the absence of noise and 50% improvement in the presence of noise. Moreover, the adaptive con®guration improves the estimation accuracy by 35±40%. #

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Underwater Acoustics

Cited by 5 publications

References 0 publications

A Frequency-Dependent Dynamic Electric–Mechanical Network for Thin-Wafer Piezoelectric Transducers Polarized in the Thickness Direction: Physical Model and Experimental Confirmation

A Frequency-Dependent Dynamic Electric–Mechanical Network for Thin-Wafer Piezoelectric Transducers Polarized in the Thickness Direction: Physical Model and Experimental Confirmation

Numerical Simulation and Experimental Verification of Electric–Acoustic Conversion Property of Tangentially Polarized Thin Cylindrical Transducer

Estimation of object location and radius of curvature using ultrasonic sonar

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