Relevant bibliographies by topics / Piezoelectric electro acoustic transducer

Academic literature on the topic 'Piezoelectric electro acoustic transducer'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Piezoelectric electro acoustic transducer"

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Yamauchi, Masakazu. "Piezoelectric electro-acoustic transducer." Journal of the Acoustical Society of America 119, no. 5 (2006): 2559. http://dx.doi.org/10.1121/1.2203530.

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Sullivan, Steven L. "Dipole horn piezoelectric electro‐acoustic transducer design." Journal of the Acoustical Society of America 94, no. 4 (October 1993): 2475. http://dx.doi.org/10.1121/1.407394.

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Dugnani, Roberto. "Novel Transducer for Characterization of Low-Impedance Materials." Key Engineering Materials 558 (June 2013): 435–44. http://dx.doi.org/10.4028/www.scientific.net/kem.558.435.

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Piezoelectric materials such as lead-zirconate-titanate (PZT), lead-metaniobate, and piezo-composites are the materials of choice for acoustic imaging in medical diagnosis as well as underwater ultrasonic microphones and underwater sonar. PZT materials have the advantage of having high electro-mechanical coupling, low internal losses and excellent environmental durability. Nonetheless, in order to improve energy transmission the high acoustic impedance of piezoelectric ceramics needs to be matched to the lower acoustic impedance of biological tissues and water. For actuators resonated in their thickness mode, energy transmission can be improved by means of intermediate layers of material of carefully selected thicknesses and acoustic properties. Sometimes a backing layer is also added to the back of the actuator to damp the acoustic back-wave. The process of making these types of transducers is generally costly due to the nature of the manufacturing process and the required level of accuracy. This paper describes an inexpensive method of manufacture low-cost, low-impedance, piezoelectric transducers. The fundamental physical principles behind this new type of sensor-actuator, as well as various examples of imaging low-impedance targets using a prototype of this newly developed sensor-actuator system will be presented.
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Korzhyk, Oleksii, Sergey Naida, Sergii Kurdiuk, Valeriia Nizhynska, Maxim Korzhyk, and Anton Naida. "Use of the pass-through method to solve sound radiation problems of a spherical electro-elastic source of zero order." EUREKA: Physics and Engineering, no. 5 (September 13, 2021): 133–46. http://dx.doi.org/10.21303/2461-4262.2021.001292.

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In the article was solved the problem of radiation of a sound by the electroacoustic transducer which is executed in the form of a thin spherical cover, using a pass-through method. The outer and inner surfaces of the shell are completely electroded. The application of this method provides an opportunity to avoid inaccuracies that arise during the traditional formulation of boundary conditions for acoustic mechanical fields, the use of equivalent substitution schemes and the absence of boundary conditions for the electric field in general. Given methodology eliminates these shortcomings by applying conjugation conditions, taking into account the types of electroding of the surfaces of piezoceramic transducers, the introduction of boundary conditions for current and voltage. The results of the solution demonstrate the high capabilities of this pass-through method, in terms of taking into account the peculiarities of determining the characteristics of these fields, values and dependences of the main complex characteristics of the electroelastic transducer, and auxiliary material constants of the piezoelectric material. The proposed approach is relevant, because it allows to increase the reliability of modeling the operating conditions of acoustic transducers in the context of wave problems of acoustics. Aim is to enhance the range of performances and build algorithms solving problems of stationary mode hydroelectroelasticity sound radiation. The expected results are presented in terms of improving approaches to studying the features of the oscillatory process of the active elements of sound-emitting systems and the accompanying effects of the transformation of interconnected fields involved in the formation of the acoustic signal in the liquid
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WANG, Q., N. WU, and S. T. QUEK. "ACOUSTIC WAVE IN PIEZOELECTRIC COUPLED PLATES WITH OPEN CIRCUIT." International Journal of Structural Stability and Dynamics 10, no. 02 (June 2010): 299–313. http://dx.doi.org/10.1142/s0219455410003476.

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An accurate modeling of the piezoelectric effect of coupled structures is essential to application of piezoelectric materials as sensors and actuators in engineering structures, such as Micro-Electro-Mechanical Systems and Interdigital Transducer for health monitoring of structures. This paper presents a simulation for the shear horizontal wave propagation in an infinite metal plate surface bonded by a piezoelectric layer with open electrical circuit, with focus on the dispersion characteristics of a metal core bonded by a layer of piezoelectric material to be used in health monitoring of structures. The dispersive characteristics and mode shapes of the deflection, electric potential, and electric displacement of the piezoelectric layer are theoretically derived. The results from numerical simulations show that the phase velocity of the piezoelectric coupled plate approaches the bulk-shear wave velocity of the substrate at high wavenumbers. The mode shapes of electric potential and deflection of the piezoelectric layer with steel substrates change from a shape with few zero nodes to one with more zero nodes at higher wavenumbers and with thicker piezoelectric layer. For the coupled plate with gold substrates at higher wavenumbers, the electric potential is found to jump from null at the interface of the piezoelectric layer and the substrate to a constant at the surface of the piezoelectric layer along the thickness direction. These findings are useful to the design of sensors using the piezoelectric coupled structures.
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TANG, F., S. L. HUANG, X. L. HU, and J. T. WANG. "ELECTRO-MECHANICAL COUPLING CHARACTERISTICS OF PZT FOR SENSOR AND ACTUATOR APPLICATION." International Journal of Modern Physics B 13, no. 29n31 (December 20, 1999): 3823–26. http://dx.doi.org/10.1142/s0217979299003994.

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Piezoelectric ceramics are good candidate materials for sensor and actuator applications, because of its ability to convert mechanical energy to electrical energy and vice versa. The response speed of Electro-mechanical converting signal in piezoelectric transducers is up to a few hundreds kilohertz. Therefore, they are widely used in vibration and acoustic system. In these applications, the nonlinearity of the materials is a main factor to consider when one designs the control system. In this paper, the nonlinearity of electro-mechanical coupling of PbZrxTi(1-x)O3 was investigated. Experimental results showed that the piezoelectric properties of PZT are greatly affected by the sequence and the amplitude of the applied voltage.
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Na, Won-Bae, and Tribikram Kundu. "EMAT-Based Inspection of Concrete-Filled Steel Pipes for Internal Voids and Inclusions." Journal of Pressure Vessel Technology 124, no. 3 (July 26, 2002): 265–72. http://dx.doi.org/10.1115/1.1491271.

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Concrete-filled steel pipes have been used as piles for supporting civil and marine structures. These piles provide good bending resistance, and can be easily spliced for long depth installation. However, these piles are usually exposed in hostile environments such as seawater and deicing materials. Thus, the outside corrosion of the steel pipe can reduce the wall thickness and the corrosion-induced delamination of internal concrete can increase internal volume or pressure. In addition, the void that can possibly exist in the pipe reduces the bending resistance. To avoid structural failure due to this type of deterioration, appropriate inspection and repair techniques are to be developed. The acoustic method is attractive for this inspection since it is relatively simple and versatile. Especially, guided wave techniques have strong potentials for this inspection because of long-distance inspection capability. There are different transducer-coupling mechanisms available for the guided wave inspection techniques. Electro-magnetic acoustic transducers (EMATs) give relatively consistent results in comparison to piezoelectric transducers since they do not need any couplant. EMATs are used for transmitting and receiving cylindrical guided waves through concrete-filled steel pipes. It is shown that EMAT-generated cylindrical guided wave techniques have good potential for the interface inspection of concrete-filled steel pipes.
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Pan, Wangbai, Guoan Tang, and Jiong Tang. "Evaluation of uncertainty effects to band gap behavior of circuitry-integrated piezoelectric metamaterial using order-reduced analysis." Journal of Intelligent Material Systems and Structures 29, no. 12 (May 31, 2018): 2677–92. http://dx.doi.org/10.1177/1045389x18778359.

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Acoustic metamaterials with unit cells that are integrated with piezoelectric transducer circuitry exhibit interesting band gap behaviors that can be used for wave/vibration manipulation. This research reports the evaluation of uncertainty effects to a typical piezoelectric metamaterial, where uncertainties in geometry/configuration and in circuitry elements are taken into consideration. Monte Carlo–type analysis is performed to assess the band gap features under these uncertainties. In order to facilitate tractable computation in uncertainty analysis, order-reduced modeling of the electro-mechanically integrated system is formulated. The component mode synthesis–based order-reduced modeling increases the computational efficiency significantly while maintaining good accuracy. Results show that the band gap behavior is generally less sensitive to configuration uncertainty but can be greatly affected by circuitry parameter uncertainty. These results can be used to guide the design and synthesis of piezoelectric metamaterials, and the method developed can be applied to the uncertainty quantification of other types of metamaterials.
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Park, Ik Keun, Hyun Mook Kim, Tae Sung Park, Yong Kwon Kim, Yong Sang Cho, and Won Joon Song. "Non-Contact Ultrasonic Inspection Technology of Fillet Weldments Monitoring." Key Engineering Materials 321-323 (October 2006): 513–17. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.513.

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It's not easy to detect the defects in fillet weldment which is widely used in various building structures and power plants just with nondestructive inspection due to its complex geometrical shape and difficult access. But it's easy to detect the cracks on the surface or just below the surface of fillet weldment heel part if surface SH-wave, among ultrasonic wave modes, is applied. The traditional ultrasound inspection using surface SH-wave is usually a contact method using piezoelectric transducer, so it's not suitable for a field application because the reliability of inspection varies depending on field environments such as couplant, contact pressure and pre-process, etc. Therefore, the necessity for non-contact ultrasound inspection is increasing. This study proposes non-contact ultrasound inspection method using EMAT (electro-magnetic acoustic transducer), and presented non-contact ultrasound inspection method for fillet weldment through experimental verification.
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Lee, Young Sup, Hyoung Jin Im, Jaehwa Kwon, and Dong Jin Yoon. "Biologically Inspired Smart Sensor for Acoustic Emission Detection." Key Engineering Materials 321-323 (October 2006): 204–7. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.204.

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This paper presents concept, analysis and experiment of a novel sensor which is based on biologically inspired approach for acoustic emission (AE) detection. It is known that a conventional AE sensor consists of a matching layer, piezoelectric transducer, backing layer, supporting electric circuit and casing. The conventional AE sensors have been widely used to detect defects in various structures and they have designed as either broadband or resonant type. However, the novel sensor described in this paper utilizes the concept of hearing organs in animals with the help of micro electro-mechanical systems (MEMS) technology. The basic design with theoretical investigation including finite element analysis showed the core hearing element such as a hair cell could be implemented with the piezoeletric material. Also it is found that the dimensional variety and proper distribution of such elements inside the sensor are critical parameters to the detectability of AE signals from structures. Both the broadband and resonant type AE sensors with relevant electric circuits could be implemented with this novel sensor concept.
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Dissertations / Theses on the topic "Piezoelectric electro acoustic transducer"

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Sharapov, V. M., K. V. Bazilo, and R. V. Trembovetskaya. "Electro-Acoustic System with Piezoelectric Sensor." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41006.

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Piezoelectric transducers are widely used in electro-acoustic, hydroacoustic, ultrasonic, medical and measuring techniques, security and control systems. One of the main characteristics of the piezoelectric transducers is operation frequency band. Despite the fact that it is used to be expanded, narrowband piezoelectric transducers also can be used. In particular, the fields of application of piezoelectric transducers are narrowband alarm systems, for example, glass breakage detectors [1].
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Chiou, Chwei-Chi. "Electroacoustics of a piezoelectric cylindrical transducer in a fluid-filled borehole." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19300.

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Дрозденко, Олександр Іванович. "Конструювання електроакустичних перетворювачів з урахуванням кавітаційних, електричних та теплових навантажень." Doctoral thesis, Київ, 2012. https://ela.kpi.ua/handle/123456789/3982.

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Larson, Gregg D. "The analysis and realization of a state switched acoustic transducer." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/16008.

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Yavuz, Siar Deniz. "Design Of A Multi-frequency Underwater Transducer Using Cylindrical Piezoelectric Elements." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613392/index.pdf.

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In this thesis, numerical and experimental design of a multi-frequency underwater acoustic transducer with cylindrical piezoelectric ceramic tubes is studied. In the numerical design, the acoustic, mechanical and thermal performances of the transducer are investigated by means of finite element method (FEM) in ANSYS. The design of the transducer that meets the acoustic requirements is checked in terms of the mechanical and thermal performances. After the completion of the numerical design, the transducer is manufactured and some performance tests such as impedance test, hydrostatic pressure test and full-power operation test are applied to it. Finally, the results of the numerical and experimental design are compared. As a result, the design of an underwater acoustic transducer that operates at two frequency bands centered at about 30 and 60 kHz under a hydrostatic pressure of 30 bars is accomplished. This transducer also resist to a shock loading of 500g for 1 millisecond.
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Parmar, Biren Jagadish. "Development Of Point-Contact Surface Acoustic Wave Based Sensor System." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/279.

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Surface Acoustic Waves (SAW) fall under a special category of elastic waves that need a material medium to propagate. The energy of these waves is confined to a limited depth below the surface over which they propagate, and their amplitudes decay with increasing depth. As a consequence of their being a surface phenomenon, they are easily accessible for transduction. Due to this reason, a lot of research has been carried out in the area, which has resulted in two very popular applications of SAW - SAW devices and in Non-Destructive Testing and Evaluation. A major restriction of SAW devices is that the SAW need a piezoelectric medium for generation, propagation and reception. This thesis reports the attempt made to overcome this restriction and utilize the SAW on non-piezoelectric substrates for sensing capabilities. The velocity of the SAW is known to be dependent purely on the material properties, specifically the elastic constants and material density. This dependence is the motivation for the sensor system developed in the present work. Information on the survey of the methods suitable for the generation and reception of SAW on non-piezoelectric substrates has been included in the thesis. This is followed by the theoretical and practical details of the method chosen for the present work - the point source/point receiver method. Advantages of this method include a simple and inexpensive fabrication procedure, easy customizability and the absence of restrictions due to directivity of the SAW generated. The transducers consist of a conically shaped PZT element attached to a backing material. When the piezoelectric material on the transmitter side is electrically excited, they undergo mechanical oscillations. When coupled to the surface of a solid, the oscillations are transferred onto the solid, which then acts as a point source for SAW. At the receiver, placed at a distance from the source on the same side, the received mechanical oscillations are converted into an electrical signal as a consequence of the direct piezoelectric effect. The details of the fabrication and preliminary trials conducted on metallic as well as non-metallic samples are given. Various applications have been envisaged for this relatively simple sensor system. One of them is in the field of pressure sensing. Experiments have been carried out to employ the acoustoelastic property of a flexible diaphragm made of silicone rubber sheet to measure pressure. The diaphragm, when exposed to a pressure on one side, experiences a varying strain field on the surface. The velocity of SAW generated on the stressed surface varies in accordance with the applied stress, and the consequent strain field generated. To verify the acoustoelastic phenomenon in silicone rubber, SAW velocities have been measured in longitudinal and transverse directions with respect to that of the applied tensile strain. Similar measurements are carried out with a pressure variant inducing the strain. The non-invasive nature of this setup lends it to be used for in situ measurement of pressure. The second application is in the field of elastography. Traditional methods of diagnosis to detect the presence of sub-epidermal lesions, some tumors of the breast, liver and prostate, intensity of skin irritation etc have been mainly by palpation. The sensor system developed in this work enables to overcome the restrictive usage and occasional failure to detect minute abnormal symptoms. In vitro trials have been conducted on tissue phantoms made out of poly (vinyl alcohol) (PVA-C) samples of varying stiffnesses. The results obtained and a discussion on the same are presented.
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Thiercelin, Mickael. "Piézoélectriques cryogéniques pour actuateurs dans l'espace et matériaux piézoélectriques sans plomb pour transducteurs acoustiques." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2012. http://www.theses.fr/2012ECAP0040/document.

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L'observation spatiale exige l’utilisation de systèmes à très haute résolution avec de grandes dimensions. La conception de ces systèmes implique la détection et associe des systèmes d'actuation pour assurer un positionnement très stable de composants optiques. Toutefois, les matériaux actuellement utilisés pour l’actionnement piézoélectrique (PZT) montrent des propriétés fortement diminuées à très basse température. Ce travail explore les performances de composés piézoélectriques PMN-xPT à des températures cryogéniques. La dépendance en température des céramiques PMN-xPT est comparée à la dépendance thermique de PZT dur (PZT-4) et doux (PZT5H) sous forme de céramiques de la température ambiante à 10 K. Les compositions en PMN-PT de structure quadratique présentent des constantes piézoélectriques stables dans la plage de température 250 - 100 K. Les plus hautes valeurs de constantes piézoélectriques sont observées pour le composé PMN-38PT dans la gamme de température 200 à 50 K. Toutes les céramiques présentent des performances décroissantes en fonction de la température. Ce comportement est attribué à un «freezing out» des contributions extrinsèques du phénomène de piézoélectricité, mais est également dû à une contribution d’effets quantiques. Le facteur de qualité mécanique (Qm) augmente très rapidement à partir de 50 K pour tous les composés. Ceci pourrait être dû à de faibles processus de relaxation à très basses températures. Les transducteurs acoustiques actuels fonctionnent avec des céramiques à base de plomb, et plus particulièrement avec des céramiques PZT. Ce matériau a de fortes propriétés électromécaniques. Cependant à cause de la toxicité du plomb, nous devons trouver des composés sans plomb afin de remplacer le PZT. Dans ce travail de recherche, un oxyde mixte synthétisé par voie classique, (K, Na, Li) (Nb, Ta, Sb) O3 sous forme de céramiques est étudié. Ce composé possède d’excellentes densités (98% dth) et de bonnes propriétés électromécaniques à température ambiante. L’étude de la texturation de ce composé montre que par la méthode de coulage en bande, nous pouvons obtenir une certaine orientation des céramiques (60%)
Space borne observation requires extremely high resolution systems with large dimensions. The design of such systems implies associating sensing and actuation systems to insure a highly stable positioning of optical components. However, the currently used PZT materials for piezoelectric actuation show strongly diminished strain at cryogenic temperatures. This work explores the performances of PMN-xPT piezoelectric materials at cryogenic temperatures. Temperature dependence of PMN-xPT ceramics is compared with hard PZT (PZT-4) and soft PZT (PZT5H) ceramics from RT to 10 K. PMN-PT tetragonal compositions exhibit stable piezoelectric constant in the 250-100 K range. The highest values of piezoelectric constant are observed for PMN-38PT in the 200-50 K range. All ceramics exhibit decreasing performances versus cooling temperature. This behaviour is attributed to a “freezing out” of extrinsic contributions to piezoelectricity [12] but is also due to a contribution of quantum effects [13, 14]. The mechanical quality factor (Qm) increases very quickly from 50 K to 10 K for all samples. This fact could be due to low relaxation processes at very low temperatures. Today acoustic transducers operate with lead-based ceramics, and more particularly lead–zirconate–titanate (PZT). This material is very powerful thanks to these high electromechanical properties. However cause of lead toxicity we have to find new materials without lead in order to replace PZT. In this paper, main guidelines to develop lead-free ceramics are given specially for acoustic transducer. A conventional mixed oxide and carbonate route to synthesis (K,Na,Li)(Nb,Ta,Sb)O3 lead-free ceramics is presented. Excellent density (98% dth) and good electromechanical properties were observed at room temperature
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Jenne, Kirk E. "Acoustic cymbal transducers-design, hydrostatic pressure compensation, and acoustic performance." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FJenne.pdf.

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Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, March 2004.
Thesis advisor(s): Thomas R. Howarth, Dehua Huang. Includes bibliographical references (p. 67-69). Also available online.
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Falcetelli, Francesco. "Modelling of Pencil-Lead Break Acoustic Emission Sources using the Time Reversal Technique." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16554/.

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In Acoustic Emissions (AE), Hsu-Nielsen Pencil-Lead Breaks (PLB) are used to generate sound waves enabling the characterization of acoustic wave speed in complex structures. The broadband signal of a PLB represents a repeatable emission, which can be applied at different regions of the structure, and therefore can be used to calibrate the localization algorithms of the AE system. In recent years, the use of Finite Element Method (FEM) has flourished for modelling acoustic Lamb wave propagation, which is present in thin plate-like structures. The primary challenge faced by the AE community is the lack of a well-known mathematical function of a PLB signal that can be applied in numerical simulations. This study makes use of a Time Reversal (TR) approach to identify the emission source of the PLB on a 7075-T651 aluminum plate. An ABAQUS CAETM model with piezoelectric actuators and sensors was developed. In order to avoid edge reflections, absorbing boundaries based on the Stiffness Reduction Method (SRM) were considered. The captured PLB signals were used as input to the FEM and was time-reversed. Furthermore, a band-limited white noise signal was used to calibrate the contribution of the broadband frequencies found in the transmitted wave packet. Preliminary results indicate that the TR approach can be used to understand the shape and function of the original transmitted signal.
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Tabrizian, Roozbeh. "Temperature-compensated silicon-based bulk acoustic resonators." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52929.

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Microelectromechanical resonators have found widespread applications in timing, sensing and spectral processing. One of the important performance metrics of MEMS resonators is the temperature sensitivity of their frequency. The main objective of this dissertation is the compensation and control of the temperature sensitivity of silicon resonators through engineering of device geometry and structural composition. This has been accomplished through formation of composite platforms or novel geometries based on dispersion characteristics of guided acoustic waves in single crystalline silicon (SCS) microstructures. Furthermore, another objective of this dissertation is to develop efficient longitudinal piezoelectric transduction for in-plane resonance modes of SCS resonators that have lithographically-defined frequencies, to reduce their motional resistance (Rm). A uniformly distributed matrix of silicon dioxide pillars is embedded inside the silicon substrate to form a homogenous composite silicon-oxide platform (SilOx) with nearly perfect temperature-compensated stiffness moduli. Temperature-stable micro-resonators implemented in SilOx platform operating in any desired in- and out-of-plane resonance modes show full compensation of linear temperature coefficient of frequency (TCF). Overall frequency drifts as small as 80 ppm has been achieved over the industrial temperature range (-40°C to 80°C) showing a 40x improvement compared to uncompensated native silicon resonators. A 27 MHz temperature-compensated MEMS oscillator implemented using SilOx resonator demonstrated sub-ppm instability over the industrial temperature range. Besides this, a new formulation of different resonance modes of SCS resonators based on their constituent acoustic waves is presented in this dissertation. This enables engineering of the acoustic resonator to provide several resonance modes with mechanical energy trapped in central part of the resonator, thus obviating narrow tethers traditionally used for anchoring the cavity to the substrate. This facilitates simultaneous piezoelectric-transduction of multiple modes with different TCFs through independent electrical ports, which can realize highly accurate self-temperature sensing of the device using a beat frequency (fb) generated from linear combination of different modes. Piezoelectrically-transduced multi-port silicon resonators implemented using this technique provide highly temperature-sensitive fb with a large TCF of ~8500 ppm/°C showing 100x improvement compared to other Quartz/MEMS counterparts, suggesting these devices as highly sensitive temperature sensors for environmental sensing and temperature-compensated/oven-controlled crystal oscillator (TCXO/OCXO) applications. Another part of this dissertation introduces a novel longitudinal piezoelectric transduction technique developed for implementation of low Rm silicon resonators operating in lithographically defined in-plane modes. Aluminum nitride films deposited on the sidewalls of thick silicon microstructures provides efficient electromechanical transduction required to achieve low Rm. 100 MHz SCS bulk acoustic resonators implemented using this transduction technique demonstrates Rm of 33Ω showing a 100x improvement compared to electrostatically transduced counterparts. Low-loss narrow-band filters with tunable bandwidth and frequency have been implemented by electrical coupling of these devices, showing their potential for realization of truly reconfigurable and programmable filter arrays required for software-defined radios.
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Books on the topic "Piezoelectric electro acoustic transducer"

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Koray, Akdoğan E., and SpringerLink (Online service), eds. Piezoelectric and Acoustic Materials for Transducer Applications. Boston, MA: Springer Science+Business Media, LLC, 2008.

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Safari, Ahmad, and E. Koray Akdoğan, eds. Piezoelectric and Acoustic Materials for Transducer Applications. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2.

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Safari, Ahmad, and E. Koray Akdogan. Piezoelectric and Acoustic Materials for Transducer Applications. Springer, 2010.

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V, Clark A., Hehman C. S, and National Institute of Standards and Technology (U.S.), eds. Empirical modeling of electromagnetic acoustic transducer data. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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V, Clark A., Hehman C. S, and National Institute of Standards and Technology (U.S.), eds. Empirical modeling of electromagnetic acoustic transducer data. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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Empirical modeling of electromagnetic acoustic transducer data. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1999.

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Book chapters on the topic "Piezoelectric electro acoustic transducer"

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Niu, Meng-Nian, and Eun Sok Kim. "Bimorph Piezoelectric Acoustic Transducer." In Transducers ’01 Eurosensors XV, 110–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59497-7_25.

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Dog̃an*, Aydin, and Erman Uzgur. "Piezoelectric Actuator Designs." In Piezoelectric and Acoustic Materials for Transducer Applications, 341–71. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_17.

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Tressler, James F. "Piezoelectric Transducer Designs for Sonar Applications." In Piezoelectric and Acoustic Materials for Transducer Applications, 217–39. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_11.

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Schönecker, Andreas. "Piezoelectric Fiber Composite Fabrication." In Piezoelectric and Acoustic Materials for Transducer Applications, 261–87. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_13.

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Damjanovic, Dragan. "Lead-Based Piezoelectric Materials." In Piezoelectric and Acoustic Materials for Transducer Applications, 59–79. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_4.

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Kosec, Marija, Barbara Malič, Andreja Benčan, and Tadej Rojac. "KNN-Based Piezoelectric Ceramics." In Piezoelectric and Acoustic Materials for Transducer Applications, 81–102. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_5.

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Takenaka, Tadashi. "Bismuth-based Piezoelectric Ceramics." In Piezoelectric and Acoustic Materials for Transducer Applications, 103–30. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_6.

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Bassiri-Gharb, Nazanin. "Piezoelectric MEMS: Materials and Devices." In Piezoelectric and Acoustic Materials for Transducer Applications, 413–30. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_20.

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Trolier-McKinstry, Susan. "Crystal Chemistry of Piezoelectric Materials." In Piezoelectric and Acoustic Materials for Transducer Applications, 39–56. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_3.

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Hladky-Hennion, Anne-Christine, and Bertrand Dubus. "Finite Element Analysis of Piezoelectric Transducers." In Piezoelectric and Acoustic Materials for Transducer Applications, 241–58. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-76540-2_12.

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Conference papers on the topic "Piezoelectric electro acoustic transducer"

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Wilt, K. R., H. A. Scarton, G. J. Saulnier, T. J. Lawry, and J. D. Ashdown. "High-Power Operation of Acoustic-Electric Power Feedthroughs Through Thick Metallic Barriers." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89496.

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Throughout the last few years there has been a significant push to develop a means for the transmission of electrical power through solid metallic walls using ultrasonic means. The bulk of this effort has been focused on using two coaxially aligned piezoelectric transducers on opposite sides of a thick metallic transmission barrier, where one transducer serves as the “transmit” transducer and the other as the “receive” transducer. Previous modeling has predicted reasonably high power transfer efficiencies through the wall using this type of “acoustic-electric channel” to be possible at low power levels, which implies that channel component operates in a linear range with little concern of failure. High-power testing of two acoustic-electric channels has been done in an effort to determine power limits on such channels and to determine levels at which non-linear effects on the piezoelectrics become non-negligible. The tested channels are characterized by the “power density” imposed on the transmit transducer, that is, the power applied per unit area, as the values found for maximum power density are considered to be independent of transducer radii. The constructed channels are shown to be capable of transmitting large amounts of power (over 100 watts) without failure; and further, extrapolation of the results to channels with larger diameter transducers predicts power transfer of 1 kW to be highly feasible.
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Tran, Hai V., and Edward H. David, Jr. "New selection criterion for piezoelectric transducer materials for optimal electro-acoustic power conversion." In San Diego '92, edited by Frederick L. Lizzi. SPIE, 1992. http://dx.doi.org/10.1117/12.130612.

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Nguyen, Ngoc Minh, Chin-Yu Chang, Gayathri Pillai, and Sheng-Shian Li. "Design of Piezoelectric MEMS Bulk Acoustic Wave Mode-Matched Gyroscopes Based on Support Transducer." In 2021 IEEE 34th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2021. http://dx.doi.org/10.1109/mems51782.2021.9375222.

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Xu, Jiawen, Shilong Li, and J. Tang. "Parametric Analysis of Piezoelectric Metamaterial With LC Shunt Circuit." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9153.

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Piezoelectric metamaterials with LC shunt circuits have potential in acoustic wave attenuation and guiding. This type of metamaterial takes advantages of the electro-mechanical coupling and local resonance from LC circuit. A unit cell of the metamaterial consists of the host medium and a piezoelectric transducer attached onto the host plate, while an LC shunt circuit is connected to the transducer. In this research, we present theoretical modeling to analyze the piezoelectric metamaterial. The influences of electro-mechanical coupling and system parameters with respect to bandgap characteristics are presented. Moreover, the unique feature of such an electro-mechanical coupling system, the online tenability, is discussed and analyzed.
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Matveev, Konstantin I., Andy Wekin, Cecilia D. Richards, and Najmeddin Shafrei-Tehrany. "On the Coupling Between Standing-Wave Thermoacoustic Engine and Piezoelectric Transducer." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41119.

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Small thermoacoustic engines integrated with piezoelectric elements can be effective small-scale power sources to convert heat to electricity. A simplified mathematical model is developed to illustrate the effect of transducer parameters on the frequency and onset temperature difference in a standing-wave engine and to estimate efficiencies of energy conversion. Results of sample calculations show that efficiencies for the acoustic-electric energy conversion on the order of 10% are feasible.
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Jia, Licheng, Lei Shi, Chengliang Sun, Sheng Liu, and Guoqiang Wu. "Aln Based Piezoelectric Micromachined Ultrasonic Transducers for Continuous Monitoring of the Mechano-Acoustic Cardiopulmonary Signals." In 2021 IEEE 34th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2021. http://dx.doi.org/10.1109/mems51782.2021.9375135.

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Zhao, Su, and Sebastian Mojrzisch. "Development of an Active Squeeze Film Journal Bearing Using High Power Ultrasonic Transducers." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1244.

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A novel active squeeze film journal bearing actuated by high power piezoelectric transducers is developed aiming for non-contact suspension of axial rotating member with active error compensation and active axis positioning. A mathematical model based on acoustic radiation pressure theory is developed to predict the levitation force of the proposed bearing system. The levitation force model is then integrated into the model of the electro-mechanical system to describe the total dynamic behavior of the bearing system. Experimental results are carried out using a prototype system, which show good agreement with the calculation.
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Lee, Kun-Lin, and Ioana Voiculescu. "Study of Low-Frequency Narrow Bandwidth Surface Acoustic Wave Sensor for Liquid Applications." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11618.

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Abstract Surface acoustic wave (SAW) devices have been applied as telecommunication filter for decades. Due to its simple interdigitated transducer (IDT) layout and geometry-dependent frequency, the SAW filter operates at the designed frequency and its working bandwidth could be designed to fulfill specific applications. Researchers also use SAW devices for sensing the mass or pressure in air. Furthermore, SAW device can be employed in liquid environments. The main focus of this paper is to present a Love mode device for liquid sensing. The Love mode device included a shear-horizontal surface acoustic wave (SH-SAW) delay-line configuration with a photoresist waveguide, which was deposited on split-electrode IDT and reflectors. The substrate was ST-cut quartz, and the SH-SAW propagated between the waveguide and the piezoelectric substrate. Using the Love mode device, we monitored the frequency shift corresponding to a water drop. We demonstrate that the insertion loss level is not critical for S-parameter transmission signal readout. The signal quality within the resonant narrowband is very important for water sensing. In this study, two types of SH-SAW devices were fabricated and tested; SH-SAW resonator and SH-SAW delay-line. We also demonstrate single and split electrodes electrode configurations to generate acoustic waves. Four different waveguide thickness values were tested to prove the benefit of thick polymer waveguide. This research also offers a standard method to fabricate SAW on ST-quartz for liquid application. In the future, we plan to integrate the Love mode device with a cell-culturing chamber to obtain a biosensor.
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Willems, Herbert, Beate Jaskolla, Thorsten Sickinger, Alfred Barbian, and Frank Niese. "A New ILI Tool for Metal Loss Inspection of Gas Pipelines Using a Combination of Ultrasound, Eddy Current and MFL." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31387.

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The two prevailing technologies in in-line inspection (ILI) of pipelines used for metal loss detection are magnetic flux leakage (MFL) and ultrasonic testing (UT). The ultrasonic method provides a more precise depth sizing as a direct measurement of the remaining thickness of the pipe wall is obtained. The advantage of providing more precise defect data leads, in turn, to a more accurate and reliable defect assessment thus reducing follow-up costs for the pipeline operator. As conventional ultrasonic tools, which are based on piezoelectric transducers, require a liquid coupling medium to couple the ultrasonic energy into the pipe wall, this technology is readily applicable to the majority of liquids pipelines, but not to gas pipelines (unless a batch of liquid is used). In order to apply ultrasonic ILI technology for metal loss inspection to gas pipelines directly, a new tool was developed based on the EMAT (electro-magnetic acoustic transducer) principle by which ultrasound is generated in the surface of the pipe wall through electromagnetic interaction. EMAT sensors utilize coils for sending and receiving ultrasound. Since coils can also be used to pick up MFL signals and eddy current signals, the sensors were designed such that, apart from the ultrasonic signals, these additional signals are recorded simultaneously. The availability of three simultaneous, independent measurements allows for considerable improvement with regard to both defect sizing and feature discrimination. In the paper, the new sensor concept and the setup of the ILI tool are described. First results are presented and discussed.
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Turolla, Axel, Massimo Zampato, Stefano Carminati, and Paolo Ferrara. "Acoustic MEMS Transducers: Look Ahead of the Bit and Geopressure Monitoring." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207841-ms.

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Abstract This paper describes the design and implementation of Acoustic Micro Electro Mechanical Systems (hereinafter referred to asA-MEMS)working in fluid-coupling mode for HP/HT specifications relevant to downhole applications such as drilling, well and reservoir monitoring. Many cutting edges applications ofA-MEMS in Oil & Gas industry are envisaged. The current work refers to the case study of a "Look Ahead of the Bit"/geopressure monitoring technique (hereinafter referred to asPPM) developed by the authors. A–MEMS with magnetic shuttle transducers have been designed so that they are not affected by environmental pressure like piezoelectric devices commonly used in MWD commercial sonic tools, which are impaired by volumetric shrinking/expansion working principle. This performance is also achieved by embedding an environmental pressure compensator tuned in the whole working bandwidth to grant pressure balance even with oscillatory motion at sonic frequencies (up to 5 kHz). Transmitter acoustic power and receiver sensitivity have been optimized in a bandwidth between 500 and 3500 Hz. A couple of A–MEMS prototypes have been built and successfully tested by using an oil filled pressure vessel at downhole T–P conditions (200 °C, 700bar) and an ad-hoc measurement setup including force, displacement, temperature sensors, transmitter (TX) driver, receiver (RX) lock-in amplifier and anacquisition system. Moreover, modal analysis at typical drilling conditions has been carried out by Stewart platform. Shock up to 1000 g and random vibrations up to 12 g RMS in 5 ÷400 Hz bandwidth have been tested. A–MEMS performance have turned out to be consistent with theoretical model predictions andhave exhibited robustness to T P variations and applied structural stress. PPM method has been validated through a triaxial compression cell in a rock mechanics laboratory, implementing a lab scale scenario with a cap rock located above a permeable rock, undergoing all geopressures of interest. However, piezo transducers used in the experiment underwent a significant failure/damage rate along with performance degrading at pressure increasing. These observations confirmed and motivated the need for A-MEMS technology development in downhole applications.
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Reports on the topic "Piezoelectric electro acoustic transducer"

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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs, and Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, October 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

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The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the project, to develop and apply the two complementary methods for quality control of agricultural commodities. In Israel: An improved firmness testing system was developed and tested with tropical fruits. The new system included an instrumented fruit-bed of three flexible piezoelectric sensors and miniature electromagnetic hammers, which served as fruit support and low-energy excitation device, respectively. Resonant frequencies were detected for determination of firmness index. Two new acoustic parameters were developed for evaluation of fruit firmness and maturity: a dumping-ratio and a centeroid of the frequency response. Experiments were performed with avocado and mango fruits. The internal damping ratio, which may indicate fruit ripeness, increased monotonically with time, while resonant frequencies and firmness indices decreased with time. Fruit samples were tested daily by destructive penetration test. A fairy high correlation was found in tropical fruits between the penetration force and the new acoustic parameters; a lower correlation was found between this parameter and the conventional firmness index. Improved table-top firmness testing units, Firmalon, with data-logging system and on-line data analysis capacity have been built. The new device was used for the full-scale experiments in the next two years, ahead of the original program and BARD timetable. Close cooperation was initiated with local industry for development of both off-line and on-line sorting and quality control of more agricultural commodities. Firmalon units were produced and operated in major packaging houses in Israel, Belgium and Washington State, on mango and avocado, apples, pears, tomatoes, melons and some other fruits, to gain field experience with the new method. The accumulated experimental data from all these activities is still analyzed, to improve firmness sorting criteria and shelf-life predicting curves for the different fruits. The test program in commercial CA storage facilities in Washington State included seven apple varieties: Fuji, Braeburn, Gala, Granny Smith, Jonagold, Red Delicious, Golden Delicious, and D'Anjou pear variety. FI master-curves could be developed for the Braeburn, Gala, Granny Smith and Jonagold apples. These fruits showed a steady ripening process during the test period. Yet, more work should be conducted to reduce scattering of the data and to determine the confidence limits of the method. Nearly constant FI in Red Delicious and the fluctuations of FI in the Fuji apples should be re-examined. Three sets of experiment were performed with Flandria tomatoes. Despite the complex structure of the tomatoes, the acoustic method could be used for firmness evaluation and to follow the ripening evolution with time. Close agreement was achieved between the auction expert evaluation and that of the nondestructive acoustic test, where firmness index of 4.0 and more indicated grade-A tomatoes. More work is performed to refine the sorting algorithm and to develop a general ripening scale for automatic grading of tomatoes for the fresh fruit market. Galia melons were tested in Israel, in simulated export conditions. It was concluded that the Firmalon is capable of detecting the ripening of melons nondestructively, and sorted out the defective fruits from the export shipment. The cooperation with local industry resulted in development of automatic on-line prototype of the acoustic sensor, that may be incorporated with the export quality control system for melons. More interesting is the development of the remote firmness sensing method for sealed CA cool-rooms, where most of the full-year fruit yield in stored for off-season consumption. Hundreds of ripening monitor systems have been installed in major fruit storage facilities, and being evaluated now by the consumers. If successful, the new method may cause a major change in long-term fruit storage technology. More uses of the acoustic test method have been considered, for monitoring fruit maturity and harvest time, testing fruit samples or each individual fruit when entering the storage facilities, packaging house and auction, and in the supermarket. This approach may result in a full line of equipment for nondestructive quality control of fruits and vegetables, from the orchard or the greenhouse, through the entire sorting, grading and storage process, up to the consumer table. The developed technology offers a tool to determine the maturity of the fruits nondestructively by monitoring their acoustic response to mechanical impulse on the tree. A special device was built and preliminary tested in mango fruit. More development is needed to develop a portable, hand operated sensing method for this purpose. In North Carolina: Analysis method based on an Auto-Regressive (AR) model was developed for detecting the first resonance of fruit from their response to mechanical impulse. The algorithm included a routine that detects the first resonant frequency from as many sensors as possible. Experiments on Red Delicious apples were performed and their firmness was determined. The AR method allowed the detection of the first resonance. The method could be fast enough to be utilized in a real time sorting machine. Yet, further study is needed to look for improvement of the search algorithm of the methods. An impact contact-pressure measurement system and Neural Network (NN) identification method were developed to investigate the relationships between surface pressure distributions on selected fruits and their respective internal textural qualities. A piezoelectric dot-matrix pressure transducer was developed for the purpose of acquiring time-sampled pressure profiles during impact. The acquired data was transferred into a personal computer and accurate visualization of animated data were presented. Preliminary test with 10 apples has been performed. Measurement were made by the contact-pressure transducer in two different positions. Complementary measurements were made on the same apples by using the Firmalon and Magness Taylor (MT) testers. Three-layer neural network was designed. 2/3 of the contact-pressure data were used as training input data and corresponding MT data as training target data. The remaining data were used as NN checking data. Six samples randomly chosen from the ten measured samples and their corresponding Firmalon values were used as the NN training and target data, respectively. The remaining four samples' data were input to the NN. The NN results consistent with the Firmness Tester values. So, if more training data would be obtained, the output should be more accurate. In addition, the Firmness Tester values do not consistent with MT firmness tester values. The NN method developed in this study appears to be a useful tool to emulate the MT Firmness test results without destroying the apple samples. To get more accurate estimation of MT firmness a much larger training data set is required. When the larger sensitive area of the pressure sensor being developed in this project becomes available, the entire contact 'shape' will provide additional information and the neural network results would be more accurate. It has been shown that the impact information can be utilized in the determination of internal quality factors of fruit. Until now,
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