A method of "weak resonance" for quality factor and coupling coefficient measurement in piezoelectrics

Mezheritsky, A.V.

doi:10.1109/tuffc.2005.1561683

Cited by 13 publications

(14 citation statements)

References 19 publications

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“…The backing with a height H of a dozen wavelengths at the operation (SAW) frequency was a typical dense mixture of tungsten powder and chips with epoxy-it provides effective damping backing with acoustical impedance nearly 15 MRayls and Q-factor near 5 [15]. The quarter-lambda thickness matching layer was a mixture of glass bubbles with epoxy, providing relatively low acoustical impedance near 1 MRayl.…”

Section: -3 Piezocomposites With Regular Structure For the Experimentsmentioning

confidence: 99%

Ultrasonic Transceiver with a Regular/Periodic 1-3 Piezocomposite Based on the SAW Resonance Mode on Damping Backing

Mezheritsky

2020

Acoustics

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A novel effective vibrational mode was discovered in the conventional transducer with an array of orthogonal (square) regular piezoelectric rods in 1-3 piezocomposite, containing the damping backing and front matching layers. The operational resonance in the structure was determined as the Surface Acoustic Wave (SAW) on the backing boundary excited by the adjacent piezo-rods, with its frequency typically near 3 times lower the fundamental half-lambda conventional piezocomposite resonance. Pulse-echo sensitivity and transmitting sound pressure level (SPL) in air showed that the signal strength is roughly comparable to the industrial similar air transducers at the frequency range 100-700 kHz, where at these frequencies the lateral and longitudinal piezoelement dimensions in the conventional transducer design are typically close to each other causing interference with unwanted coupling modes. As was determined theoretically and proved in experiments, the backing SAW resonance effect in the transducer performance is inherent just to the regular periodic 1-3 piezocomposite structure and does occur neither with randomly located/oriented piezo-rods nor in the homogeneous piezo-plate at least with the same lateral cross-section as the connected to it backing. The purpose of the article is to investigate a newly discovered operational vibrational mode of a SAW type in 1-3 regular piezocomposite, other than piezoelectric resonance. The investigated phenomena can improve the transceiver sensitivity and bandwidth, providing lower drive voltage and smaller and lighter weight ultrasonic transducers. Based on the piezocomposites with thickness' 1-1.5 mm (rod resonance near 2-3 MHz), pillar width 0.2-0.8 mm, kerf width 0.1-0.4 mm, the transceivers with an operating frequency from 140 kHz to 650 kHz were designed and fabricated with a conventional backing of a mixture of high-density tungsten powder and epoxy and a matching layer of a mixture of low-density glass bubbles and epoxy. Experimental evaluation of their acoustical performance showed expected characteristics suitable for practical applications.

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Section: -3 Piezocomposites With Regular Structure For the Experimentsmentioning

confidence: 99%

Ultrasonic Transceiver with a Regular/Periodic 1-3 Piezocomposite Based on the SAW Resonance Mode on Damping Backing

Mezheritsky

2020

Acoustics

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“…According to [28]- [31], the resonance Q r and antiresonance Q a quality factors of an elementary [29] rod resonator (k 33 -type longitudinal vibration) at its fundamental harmonic are close to Q a = Q D 33 and Q r ∼ = Q E 33 . At the same time, the quality factors Q r,a have similar behavior in "strong field" [30], so that the Q (m) parameter in (7) will be further considered close to material mechanical quality factor Q m with its well known properties [10], [19], [30] determined on standard piezoceramic samples [29].…”

Section: A Basic Descriptionmentioning

confidence: 99%

“…The input PT capacitance does not directly affect the PT output voltage and power transfer. A typical resonance PT characteristic [e.g., the output voltage (17)] has three kinds of frequencydependent factors: a relatively weak factor of PT sections elastic anisotropy, the second one with a smooth dependence on frequency as a C-R filter of capacitive PT output − active load [31], and the third one is related to the resonantQ-factor with the characteristic resonance frequency and bandwidth. All in general are dependent on load.…”

Section: B Input Pt Admittance Voltage Gain and Energy Characterismentioning

confidence: 99%

“…As in the typical spectrum of a standard resonator [31], the PT input resonance electrical response has three characteristic frequencies of maximum (f m ) and minimum (f n ) full admittance, and maximum (f s ) conductance. They all are load dependent, and their difference greatly decreases following the system's quality factorQ dropping at t → 1.…”

Section: Frequency Pt Characteristicsmentioning

confidence: 99%

“…and s.c. regimes of loading, the input PT admittance intensity (A, dB) and system's quality factor (Q) are both greatly dropping down, so that the resonance frequency interval G = f n f m − 1 of the input PT admittance equals Q −1 for the intensities less than A < 10 dB due to loading. Moreover, the following relationships take place minQ ∼ = G −1 ef f ∼ = G −1 r−r , that allows one to effectively control the basic PT parameters [31].…”

Section: B Pt Characteristic Frequenciesmentioning

confidence: 99%

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Quality factor concept in piezoceramic transformer performance description

Mezheritsky¹

2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Self Cite

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A new general approach based on the quality factor concept to piezoceramic transformer (PT) performance description is proposed. The system's quality factor, material elastic anisotropy, and coupling factors of the input and output sections of an electrically excited and electrically loaded PT fully characterize its resonance and nearresonance behavior. The PT efficiency, transformation ratio, and input and output power were analytically analyzed and simulated as functions of the load and frequency for the simplest classical Langevin-type and Rosen-type PT designs.A new formulation of the electrical input impedance allows one to separate the power consumed by PT from the power transferred into the load. The system's PT quality factor takes into account losses in each PT "input-outputload" functional components. The loading process is changing PT input electrical impedance on the way that under loading the minimum series impedance is increasing and the maximum parallel impedance is decreasing coincidentally. The quality-factors ratio, between the states of fully loaded and nonloaded PT, is one of the best measures of PTs dynamic performance-practically, the lower the ratio is, the better PT efficiency. A simple and effective method for the loaded PT quality factor determination is proposed. As was found, a piezoceramic with low piezoelectric anisotropy is required to provide maximum PT efficiency and higher corresponding voltage gain. Limitations on the PT output voltage and power, caused by nonlinear effects in piezoceramics, were established.

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Dielectric anomalies and dc-resistivity degradation in PbNb2O6-based ceramics at high temperature

Jin,

Ren,

et al. 2024

Ceramics International

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A method of "weak resonance" for quality factor and coupling coefficient measurement in piezoelectrics

Cited by 13 publications

References 19 publications

Ultrasonic Transceiver with a Regular/Periodic 1-3 Piezocomposite Based on the SAW Resonance Mode on Damping Backing

Ultrasonic Transceiver with a Regular/Periodic 1-3 Piezocomposite Based on the SAW Resonance Mode on Damping Backing

Quality factor concept in piezoceramic transformer performance description

Dielectric anomalies and dc-resistivity degradation in PbNb2O6-based ceramics at high temperature

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