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Today Composite Transducers have many advantages

In our DGZfP'96 NDT Conference Report we talked already about Dr. Splitt's speach regarding this issue, and his article "Composite Prüfköpfe ein Meilenstein in der Ultraschallprüfung" is available too.
Today Composite Transducers have many advantages Due to the copyright allowance of the INSPEC Database we are able to give a further deep information on this issue. On this page we display the search result for "ultrasonic and transducer and composite".
  1. Ultrasonic piezoceramic-polymer composite transducer-dynamic behavior and effects of heterogeneous structure
  2. Theoretical modeling of resonant modes of composite ultrasonic transducers
  3. A novel ultrasonic array incorporating composite transducer technology
  4. Composite diaphragm ultrasonic transducers employing air-gap structure
  5. Evaluation of a novel ultrasonic technique for reliable detection of flooded members in offshore installations
  6. Novel composite transducer for ultrasonic NDE of concrete
  7. Sound field characteristics of ultrasonic composite pulse transducers
  8. A multifrequency composite ultrasonic transducer system
  9. Composite piezoelectrics: basic research to a practical device
  10. Performance of ultrasonic composite transducers made from scribed-fractured piezoelectric ceramics
  11. Fractured piezoelectric ceramics for broadband ultrasonic composite transducers
  12. Piezoelectric composite transducers for ultrasonic diagnostic applications
  13. A computational tool for the design of ultrasonic systems
  14. Finite element simulation of a composite piezoelectric ultrasonic transducer
  1. Ultrasonic piezoceramic-polymer composite transducer-dynamic behavior and effects of heterogeneous structure
    Author(s): Zhang, Q.M.; Geng, X.; Shui, Y.; Cao, W.; Cross, L.E.
    Corporate Source: Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
    ISAF '94. Proceedings of the Ninth IEEE International Symposium on Applications of Ferroelectrics (Cat. No.94CH3416-5), p. 329-32
    Author(s): Pandey, R.K. (ED); Liu, M. (ED); Safari, A. (ED)
    Published: 1994, IEEE, New York, NY, USA
    Pages: xix+855, ISBN: 0 7803 1847 1
    Country of Publication: USA
    Meeting: 7-10 Aug. 1994, University Park, PA, USA
    Document Type: CA (Conference Article)
    Treatment: P (Practical); T (Theoretical or Mathematical)
     A dynamic theory is developed for piezocomposites with 2-2 connectivity. By solving the coupled dynamic equations in the piezoceramic plate and polymer region subjected to the boundary conditions at the ceramic-polymer interface, the distributions of the elastic and electric variables in a composite are obtained. The electromechanical coupling factor, the acoustic impedance, the resonant frequency, and the elastic coupling between the polymer and ceramic at the thickness resonance can be determined. The effects of mode coupling on the thickness resonance and lateral resonance are elucidated and the dependence of the frequency of these resonant modes on the composite thickness can be estimated. Theoretical results are compared with experimental observations (8 refs.) Controlled Terms: acoustic impedance; composite material interfaces; electromechanical effects; filled polymers; piezoceramics; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: ultrasonic piezoceramic-polymer composite transducer; dynamic behavior; heterogeneous structure; dynamic theory; piezocomposites; 2-2 connectivity ; coupled dynamic equations; piezoceramic plate; polymer region; boundary conditions; ceramic-polymer interface; elastic variables; electric variables; electromechanical coupling factor; acoustic impedance; resonant frequency; elastic coupling; thickness resonance; mode coupling; lateral resonance; composite thickness
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B7810C Sonic and ultrasonic transducers
    B2860 Piezoelectric and ferroelectric devices
  2. Theoretical modeling of resonant modes of composite ultrasonic transducers
    Author(s): Yongan Shui; Xuechang Geng; Zhang, Q.M.
    Corporate Source: Inst. of Acoust., Nanjing Univ., China
    IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol.42, no.4, p. 766-73 Published: July 1995
    CODEN: ITUCER
    ISSN: 0885-3010
    Country of Publication: USA
    Treatment: T (Theoretical or Mathematical)
    Although a great deal of effort has been devoted to the modeling of composite piezoelectric materials, most of the earlier works are based on the assumption that the structure of the composite relative to the wavelength is very fine. Such approximation cannot address the complete dynamic behavior of composites. In order to understand the overall characteristics of composite ultrasonic transducers, a dynamic model was developed, in which the acoustic waves propagating in 2-2 composites along the thickness direction were analyzed by solving the coupled elastic equations of the constituent phases. By neglecting the boundary conditions of the free surfaces and simply taking the resonator thickness as half a wavelength, the resonant modes of the composite transducers as functions of aspect ratio of the ceramic plate elements and volume fraction of ceramic phase can be calculated from this model. The theoretical dispersion curves for the thickness mode and the lateral periodical mode agree with the experimental results. The vibration distribution in the ceramic and polymer phases at the resonant frequency as a function of the composite thickness as well as the volume fraction of the ceramic phase are obtained, and through the discussion of the vibration field the variation rule of the resonant frequency is well explained. For the resonant frequency the results of the isostrain model, the stopband resonance model, and the T-matrix model are consistent with the predictions made by this model under the special condition of very fine structure (15 refs.) Controlled Terms: acoustic impedance; piezoceramics; ultrasonic transducer arrays Uncontrolled Terms: resonant modes; composite ultrasonic transducers; dynamic behavior; thickness direction; coupled elastic equations; aspect ratio; ceramic plate elements; lateral periodical mode; volume fraction; ceramic phase; isostrain model; T-matrix model
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B7810C Sonic and ultrasonic transducers
  3. A novel ultrasonic array incorporating composite transducer technology
    Author(s): Powell, D.J.; Hayward, G.
    Corporate Source: Dept. Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK IEEE 1992 Ultrasonics Symposium (Cat. No.92CH3118-7), p. 527-30 vol.1
    Published: 1992, IEEE, New York, NY, USA
    Pages: 2 vol. 1306, ISBN: 0 7803 0562 0
    Country of Publication: USA
    Meeting: 20-23 Oct. 1992, Tucson, AZ, USA
    Sponsor(s): IEEE; Ultrasonics Ferroelectric; Frequency Control Soc
    Document Type: CA (Conference Article)
    Treatment: N (New Development); P (Practical); T (Theoretical or Mathematical); X (Experimental)     A new type of ultrasonic array transducer that incorporates the high bandwidth reception properties of PVDF with the greater transmission sensitivity of a composite transducer is presented. Through careful choice of epoxy phase for the composite polymer matrix and a novel electroding technique, the composite maintains its normal transmission sensitivity but with the added advantage of practical flexibility. The authors consider the theoretical and practical design of the array structure with the piezoelectric process within the composite and with the choice of ceramic pillar width-to-height (W/H) ratio being based upon a series of finite element modeling results. The array's operation is evaluated by (a) a modified facet ensemble model which is used to predict the backscattered response from a variety of test specimens possessing surface fatigue cracks and arbitrary surface variations and (b) experimental imaging performance (4 refs.) Controlled Terms: acoustic arrays; filled polymers; finite element analysis; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: prezoelectric composite; composite transducer technology; ultrasonic array transducer; high bandwidth reception; PVDF; electroding technique; flexibility; ceramic pillar width-to-height; finite element modeling; modified facet ensemble model; backscattered response; surface fatigue cracks; arbitrary surface variations; imaging performance
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B7810C Sonic and ultrasonic transducers
    B2860 Piezoelectric and ferroelectric devices
  4. Composite diaphragm ultrasonic transducers employing air-gap structure
    Author(s): Shiokawa, J.; Makishima, Y.; Hashimoto, K.; Yamaguchi, M.
    Corporate Source: Dept. of Electr. & Electr. Eng., Fac. of Eng., Chiba Univ., Japan Japanese Journal of Applied Physics, Part 1 (Regular Papers & Short Notes), vol.32, no.5B, p. 2321-4
    Published: May 1993
    CODEN: JAPNDE
    ISSN: 0021-4922
    Country of Publication: Japan
    Document Type: JA (Journal Article)
    Treatment: P (Practical); X (Experimental)
    Discusses the possibility of applying an air-gap structure to the development of composite diaphragm ultrasonic transducer arrays. Analysis suggests that low-loss, wide-bandwidth transducers could be realised using Pyrex-glass/ZnO/Pyrex-glass composite diaphragms fabricated on an air-gap. It is also shown that the transducer performance is considerably improved with another polyimide matching layer. A transducer consisting of a Pyrex-glass/ZnO/Pyrex-glass composite diaphragm on an air-gap was experimentally fabricated, and its basic performance was shown (7 refs.) Controlled Terms: acoustic arrays; ultrasonic transducers Uncontrolled Terms: air-gap structure; composite diaphragm ultrasonic transducer arrays; low-loss; wide-bandwidth transducers; Pyrex-glass/ZnO/Pyrex-glass composite diaphrag- ms; polyimide matching layer; ZnO

    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B7810C Sonic and ultrasonic transducers
    Chemical Indexing: ZnO/int Zn/int O/int ZnO/bin Zn/bin O/bin

  5. Evaluation of a novel ultrasonic technique for reliable detection of flooded members in offshore installations
    Author(s): Stirling, G.; Hayward, G.; Pearson, J.
    Corporate Source: Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK IEEE 1991 Ultrasonics Symposium Proceedings. (Cat. No.91CH3079-1), p. 895-8 vol.2
    Author(s): McAvoy, B.R. (ED)
    Published: 1991, IEEE, New York, NY, USA
    Pages: 2 vol. 1386
    Country of Publication: USA
    Meeting: 8-11 Dec. 1991, Orlando, FL, USA
    Sponsor(s): IEEE
    Document Type: CA (Conference Article)
    Treatment: P (Practical)
    Flooded member detection (FMD) of offshore oil installations involves the detection of sea water in normally air-filled structural members of steel jacket installations. The design and trial implementation of a prototype FMD tool, based around a multi-frequency ultrasonic array, incorporating composite transducer technology and providing data analysis using an expert system are described. Problems associated with more conventional ultrasonic techniques are discussed and improvements offered by the new system are highlighted with a series of operational trials. The tool has a novel ultrasonic array which provides improved efficiency over conventional sensors, and a multi-transducer feature permits identification of corrosion and bad contact conditions generally encountered (7 refs.) Controlled Terms: acoustic arrays; corrosion testing; expert systems; inspection; oil technology; ultrasonic applications; ultrasonic transducers Uncontrolled Terms: seawater detection; ultrasonic technique; reliable detection; flooded members; offshore oil installations; air-filled structural members; steel jacket installations; multi-frequency ultrasonic array; composite transducer; data analysis; expert system; corrosion; bad contact conditions
    Classification Codes:
    B7820 Sonic and ultrasonic applications
    B0170L Inspection and quality control
  6. Novel composite transducer for ultrasonic NDE of concrete
    Author(s): Turner, C.W.; Arif, M.Z.
    Corporate Source: Dept. of Electron. & Electr. Eng., King's Coll., London, UK IEEE 1991 Ultrasonics Symposium Proceedings. (Cat. No.91CH3079-1), p. 757-61 vol.2
    Author(s): McAvoy, B.R. (ED)
    Published: 1991, IEEE, New York, NY, USA
    Pages: 2 vol. 1386
    Country of Publication: USA
    Meeting: 8-11 Dec. 1991, Orlando, FL, USA
    Sponsor(s): IEEE
    Document Type: CA (Conference Article)
    Treatment: X (Experimental)
    Ultrasonic inspection of concrete structures is practicable only at relatively low frequencies because of multiple scattering caused by the aggregate. Conventional techniques used in ultrasonic nondestructive evaluation (NDE) are less effective below 500 KHz, and new methods of transducer design are needed. Experimental results for a novel transducer, based on the principles of composite acoustic waveguides, used both as a point source transmitter or as a receiver capable of operation at arbitrarily low ultrasonic frequencies, are reported (5 refs.) Controlled Terms: acoustic receivers; acoustic waveguides; concrete; inspection; ultrasonic materials testing; ultrasonic transducers Uncontrolled Terms: ultrasonic inspection; nondestructive examination; composite transducer; concrete structures; composite acoustic waveguides; point source transmitter; receiver; low ultrasonic frequencies; 120 to 220 kHz
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    A8170C Nondestructive testing
    A4385 Acoustical measurements and instrumentation
    B7810C Sonic and ultrasonic transducers
    B0590 Materials testing
    B7820 Sonic and ultrasonic applications
    Numerical Indexing: frequency (Hz) 1.2E+05/2.2E+05
  7. Sound field characteristics of ultrasonic composite pulse transducers
    Author(s): Richter, K.P.; Reibold, R.; Molkenstruck, W.
    Corporate Source: Phys.-Tech. Bundesanstalt, Braunschweig, West Germany Ultrasonics, vol.29, no.1, p. 76-80
    Published: Jan. 1991
    CODEN: ULTRA3
    ISSN: 0041-624X
    Country of Publication: UK
    Document Type: JA (Journal Article)
    Treatment: P (Practical); X (Experimental)
    Composite piezoelectric materials are of increasing importance in transducer technology. Recent research work is focused on ceramic-polymer composites for medical and material diagnosis. The present study deals with the dynamic behaviour of broadband composite transducers, with particular emphasis on sound field properties affected by lateral resonance effects. Besides admittance and transfer function measurements a high-resolution acousto-optic technique is also used which makes detailed insight into the sound field structure possible (11 refs.) Controlled Terms: acoustic field; ultrasonic transducers Uncontrolled Terms: ultrasonic composite pulse transducers ; dynamic behaviour; broadband composite transducers; sound field properties; lateral resonance effects; admittance; transfer function; high-resolution acousto-optic technique
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    A4335 Ultrasonics, quantum acoustics, and physical effects of sound
    B7810C Sonic and ultrasonic transducers
  8. A multifrequency composite ultrasonic transducer system
    Author(s): Bui, T.; Chan, H.L.W.; Unsworth, J.
    Corporate Source: Ausonics Pty. Ltd., Lane Cove, NSW, Australia IEEE 1988 Ultrasonics Symposium. Proceedings (IEEE Cat. No.88CH2578-3), p. 627-30 vol.2
    Author(s): McAvoy, B.R. (ED)
    Published: 1988, IEEE, New York, NJ, USA
    Pages: 2 vol. 1113
    Country of Publication: USA
    Meeting: 2-5 Oct. 1988, Chicago, IL, USA
    Sponsor(s): Ultrasonics, Ferroelectric & Frequency Control Soc; et al
    Document Type: CA (Conference Article)
    Treatment: T (Theoretical or Mathematical); X (Experimental)
    A multifrequency composite ultrasonic transducer system is described that comprises piezoelectric ceramic rods embedded in a polymer matrix. By selecting the appropriate thickness and width of ceramic rod, the transducer assembly can be made to resonate at a number of frequencies, as predicted by the mode coupling theory. One of the resonance frequencies is determined by the width of the ceramic rod; other resonance frequencies are determined by the width-to-thickness ratio of the ceramic rods. A batch of five 2-MHz and 5-MHz dual-frequency transducers was fabricated. The results correlate well with the theoretical prediction (8 refs.) Controlled Terms: composite materials; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: multifrequency composite ultrasonic transducer; piezoelectric ceramic; polymer matrix; resonance frequencies; 2 MHz; 5 MHz
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B7810C Sonic and ultrasonic transducers
    B2860 Piezoelectric and ferroelectric devices
    Numerical Indexing: frequency (Hz) 2.0E+06; frequency (Hz) 5.0E+06
  9. Composite piezoelectrics: basic research to a practical device
    Author(s): Smith, W.A.; Shaulov, A.A.
    Corporate Source: Philips Labs., North American Philips Corp., Briarcliff Manor, NY, USA Ferroelectrics, vol.87, p. 309-20
    Published: 1988
    CODEN: FEROA8
    ISSN: 0015-0193
    Country of Publication: UK
    Document Type: JA (Journal Article)
    Treatment: X (Experimental)
    The adaptability of 1-3 PZT-rod/polymer-matrix piezoelectric composites commends them for the requirements of medical ultrasonic imaging transducers. The authors describe material fabrication techniques, material design considerations and transducer design trade-offs involved in this application. A simple dice-and-fill fabrication technique yields material suitable for transducers with frequencies approaching 10 MHz. The piezocomposites provide high electromechanical coupling and low acoustic impedance-properties superior to those of the conventional piezoceramics and piezopolymers. Composite piezoelectric plates can be formed into complex shapes for beam focusing and steering. Moreover, arrays defined by simply patterning the electrode-not cutting the plate-exhibit no spurious modes in individual elements and low cross-talk between array elements. The resulting device performance is illustrated with a concave annular array which shows high sensitivity (8 dB insertion loss), large bandwidth (57%), compact impulse response (-20 dB ringdown of 3.3 periods, -40 dB ringdown of 6.2 periods) and good beam focusing. Such composite-piezoelectric ultrasonic transducers provide a paradigm for engineering material properties to optimize the performance of a practical device (27 refs.) Controlled Terms: composite materials; lead compounds; materials preparation; piezoelectric transducers; polymers; zirconium compounds Uncontrolled Terms: 1-3 PZT-rod/polymer-matrix piezoelectric composites; medical ultrasonic imaging transducers; material fabrication techniques; material design considerations; transducer design trade-offs; dice-and-fill fabrication technique; electromechanical coupling; acoustic impedance; PZT; PbZrO3TiO3
    Classification Codes:
    B2860C Acoustic wave devices
    B7810C Sonic and ultrasonic transducers
    Chemical Indexing: PbZrO3TiO3/ss TiO3/ss ZrO3/ss O3/ss Pb/ss Ti/ss Zr/ss O/ss
  10. Performance of ultrasonic composite transducers made from scribed-fractured piezoelectric ceramics
    Author(s): Gallego-Juarez, J.A.; Sarabia, E.R.; Ramos-Fernandez, A.
    Corporate Source: Inst. de Acustica, CSIC, Madrid, Spain Ultrasonics International 87 Conference Proceedings, p. 471-6
    Published: 1987, Butterworth, Guildford, UK
    Pages: xiii+959, ISBN: 0 408 02348 1
    Country of Publication: UK
    Meeting: 6-9 July 1987, London, UK
    Document Type: CA (Conference Article)
    Treatment: X (Experimental)
    Piezoelectric composites (PZT/polymer) with 1-3 connectivity are well suited to medical ultrasound transducers in the low megahertz range. This paper deals with the characteristics and performance of a new type of composite transducer based on scribed-fractured piezoelectric ceramics. Results show the good sensitivity and short impulse response of the constructed prototypes (7 refs.) Controlled Terms: composite materials; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: ultrasonic composite transducers; scribed-fractured piezoelectric ceramics; PZT; polymer; connectivity; medical ultrasound transducers; sensitivity; impulse response
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B0550 Composite materials
    B2860C Acoustic wave devices
    B7810C Sonic and ultrasonic transducers
  11. Fractured piezoelectric ceramics for broadband ultrasonic composite transducers
    Author(s): Montero de Espinosa, F.R.; Pavia, V.; Gallego-Juarez, J.A.; Pappalardo, M.
    Corporate Source: Inst. de Acustica, CSIC, Madrid, Spain IEEE 1986 Ultrasonics Symposium Proceedings (Cat. No.86CH2375-4), p. 691-6 vol.2
    Author(s): McAvoy, B.R. (ED)
    Published: 1986, IEEE, New York, NY, USA
    Pages: 2 vol. 1130
    Country of Publication: USA
    Meeting: 17-19 Nov. 1986, Williamsburg, VA, USA
    Sponsor(s): IEEE; Andersen Labs.; Hewlett-Packard; Phonon Corp.; Westinghouse; et al
    Document Type: CA (Conference Article)
    Treatment: P (Practical); X (Experimental)
    To create composites with irregularly shaped ceramic elements randomly distributed in a plastic matrix, a procedure has been developed which essentially consists of multifracturing a commercial piezoceramic plate by using two different techniques and then pouring the plastic phase between the resulting ceramic elements. This procedure increases the mechanical losses in the ceramic phase. The bandwidth and sensitivity of the composite specimens fabricated by using this method present equivalent values to that of state-of-the art regular composites with 1-3 connectivity (6 refs.) Controlled Terms: ceramics; fracture; materials preparation; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: fractured piezoelectric ceramics; broadband ultrasonic composite transducers; plastic matrix; commercial piezoceramic plate; mechanical losses; bandwidth; sensitivity; 1-3 connectivity
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    A8120L Ceramics and refractories
    B0540 Ceramics and refractories
    B2860 Piezoelectric and ferroelectric devices
    B7810C Sonic and ultrasonic transducers
  12. Piezoelectric composite transducers for ultrasonic diagnostic applications
    Author(s): Bui, T.; Chan, H.L.W.; Unsworth, J.
    Corporate Source: Ausonics Pty Ltd., Lane Cove, NSW, Australia
    ISAF '86. Proceedings of the Sixth IEEE International Symposium on Applications of Ferroelectrics (Cat.
    No.86CH2358-0), p. 257-60
    Published: 1986, IEEE, New York, NY, USA
    Pages: 738
    Country of Publication: USA
    Meeting: 8-11 June 1986, Bethlehem, PA, USA
    Sponsor(s): IEEE; Army Res. Office; Office Naval Res.; et al
    Document Type: CA (Conference Article)
    Treatment: A (Application); X (Experimental)
    The acoustic impedance of the piezoelectric composites over the frequency range of 0.5-7.5 MHz was measured using the reflection, the echo shift and the resonant techniques. There was a significant difference between the impedance measured by the reflection technique in comparison with the other two techniques. Within each technique, the impedance was found to be a function of the volume percentage of the ceramic and not a function of frequency. Focused transducers were made using grinding and thermal forming processes. The pulse echo response of the composite transducers seems to be similar to ceramic transducers (4 refs.) Controlled Terms: acoustic impedance; biomedical ultrasonics; piezoelectric transducers; ultrasonic transducers Uncontrolled Terms: piezoelectric composite transducers; reflection technique; echo shift technique; ultrasonic diagnostic applications; acoustic impedance; resonant techniques; ceramic; grinding; thermal forming; pulse echo response; 0.5 to 7.5 MHz
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    A8760B Sonic and ultrasonic radiation
    B2860 Piezoelectric and ferroelectric devices
    B7510B Radiation and radioactivity applications
    B7810C Sonic and ultrasonic transducers
    Numerical Indexing: frequency (Hz) 5.0E+05/7.5E+06
  13. A computational tool for the design of ultrasonic systems
    Author(s): Wormley, S.J.; Thompson, D.O.; Lakin, K.M.
    Corporate Source: Ames Lab., Iowa State Univ., Ames, IA, USA Review of Progress in Quantitative Nondestructive Evaluation, p. 1473-86 vol.2B
    Author(s): Thompson, D.O. (ED); Chimenti, D.E. (ED)
    Published: 1983, Plenum, New York, NY, USA
    Pages: 2 vol.(xx+1853), ISBN: 0 306 41350 7
    Country of Publication: USA
    Meeting: 1-6 Aug. 1982, San Diego, CA, USA
    Document Type: CA (Conference Article)
    Treatment: A (Application); P (Practical)
    As a part of an effort to develop a composite, multiviewing ultrasonic transducer for flaw characterization, a computational tool has been developed which provides a convenient way to select driver pulse shapes and transducer characteristics which optimize this property (7 refs.) Controlled Terms: crack detection; ultrasonic materials testing; ultrasonic transducers Uncontrolled Terms: US system design; computational tool; multiviewing ultrasonic transducer; flaw characterization; transducer characteristics
    Classification Codes:
    A4385 Acoustical measurements and instrumentation
    A4388 Transduction; devices for the generation and reproduction of sound
    A8170C Nondestructive testing
    B0590 Materials testing
    B7810C Sonic and ultrasonic transducers
  14. Finite element simulation of a composite piezoelectric ultrasonic transducer
    Author(s): Kagawa, Y.; Yamabuchi, T.
    Corporate Source: Dept. of Electrical Engng., Nat. Univ. of Toyama, Takaoka, Toyama, Japan IEEE Transactions on Sonics and Ultrasonics, vol.SU26, no.2, p. 81-8
    Published: March 1979
    CODEN: IESUAU
    ISSN: 0018-9537
    Country of Publication: USA
    Document Type: JA (Journal Article)
    Treatment: T (Theoretical or Mathematical)
    The finite element technique is applied to a problem of composite piezoelectric transducers for ultrasonic radiation. Their characteristics, input admittances at the electrical terminals, the loading effect of acoustic radiation, near-field sound pressure distributions, and directional patterns are analyzed. In previous work, two computer programs were separately developed to predict the behaviour of piezoelectric resonators and acoustic-radiation systems. These are now combined so that sound pressure and particle velocity are compatible on a resonator-medium interface. It is again confirmed that the technique is useful for computer simulation of and computer-aided design for this kind of problem (9 refs.) Controlled Terms: finite element analysis; piezoelectric transducers; simulation; ultrasonic transducers Uncontrolled Terms: composite piezoelectric ultrasonic transducer; finite element technique; characteristics; input admittances; loading effect; sound pressure distributions; directional patterns; particle velocity; computer simulation ; computer aided design
    Classification Codes:
    A4388 Transduction; devices for the generation and reproduction of sound
    B2860C Acoustic wave devices
    B7810C Sonic and ultrasonic transducers
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Rolf Diederichs 1. June 1996, info@ndt.net