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  • 1
    Online Resource
    Online Resource
    Erratum: ’’Filled rubber material system: Application to echo absorption in waterfilled tanks’’ [J. Acoust. Soc. Am. 68, 655–664 (1980)]
    Acoustical Society of America (ASA) ; 1982
    In:  The Journal of the Acoustical Society of America Vol. 71, No. 1 ( 1982-01-01), p. 224-224
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 71, No. 1 ( 1982-01-01), p. 224-224
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.387886
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1982
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Tank coatings for ultrasonic echo reduction
    Acoustical Society of America (ASA) ; 1979
    In:  The Journal of the Acoustical Society of America Vol. 65, No. S1 ( 1979-06-01), p. S46-S46
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 65, No. S1 ( 1979-06-01), p. S46-S46
    Abstract: A filled-rubber materials system with selectable and continuously variable acoustic properties is described and used to form broadband anechoic tiles. By applying these tiles to the inside walls of acoustic testing tanks, wall reflections are reduced by 20 to 35 dB at frequencies from 0.5 to 10 MHz. This is advantageous since it allows the use of smaller examination tanks, for example in ultrasonic testing and biomedical applications, and permits the use of cw tanks of tractable size, for example in schlieren and acoustic-visualization studies. The tank coatings developed include one and two layer tiles, 0.15 to 0.65 cm thick. Using a theoretical model of sound propagation in multilayer media, we first calculated the optimum material properties needed to construct tiles meeting specific echo reduction requirements. These materia] requirements were then met by choosing the type and concentration of fillers added to an RTV-602 silicone rubber base. The subsequently measured performance of these tiles agree with that initially predicted by theory.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2017272
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1979
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Filled rubber materials system: Application to echo absorption in waterfilled tanks
    Acoustical Society of America (ASA) ; 1980
    In:  The Journal of the Acoustical Society of America Vol. 68, No. 2 ( 1980-08-01), p. 655-664
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 68, No. 2 ( 1980-08-01), p. 655-664
    Abstract: This paper describes a materials system for forming rubber composites with selectable acoustic properties. It is particularly suitable for laboratory use in molding small articles with longitudinal sound speeds and impedances less than (or not much greater than) those of water, and with sound absorption coefficients which may be varied over a wide range. The composites are formed using a common silicone rubber resin (RTV-602) to which various fillers may be added in controlled amounts. In this study, we measured the sound speed, density, and attenuation coefficient for more than 100 samples containing various concentrations and types of these fillers. These data were then reduced to determine the best-fit coefficients in a set of descriptive equations. Thereafter these equations could be used to calculate the filler concentrations needed to form composites with specific required properties. To demonstrate the usefulness and predictability of these materials in an application of general interest, these composites are used to construct several broadband anechoic coatings which reduce tank wall reflections by 20–35 dB at frequencies from 400 kHz to greater than 7 MHz. One- and two-layer coatings were designed using equations derived from Brekhovskikh’s treatment of sound propagation in multilayer media. These coatings were then molded as tiles, and their actual performance is compared with that theoretically predicted. When applied to the inside walls of ultrasonic testing tanks, these tiles significantly reduce the tank size needed for various laboratory and biomedical applications.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.384724
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1980
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Strain relaxation in glass by optical correlation and pressure jump relaxation
    AIP Publishing ; 1975
    In:  Journal of Applied Physics Vol. 46, No. 2 ( 1975-02-01), p. 741-746
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 46, No. 2 ( 1975-02-01), p. 741-746
    Abstract: Strain relaxation functions have been obtained for boron trioxide glass in its transformation region by digital correlation of a scattered optical beam and by pressure jump relaxation measurements utilizing a recently developed acoustic densitometer. The results confirm that the light−scattering correlation data is a measurement of the isothermal constant stress compressibility function. These measurements, together with previous ultrasonic results, cover a temperature region for B2O3 in which the structural relaxation time changes by more than 13 orders of magnitude.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.321639
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1975
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    The Design and Performance of a Differential Low-Frequency Ultrasonic Apparatus
    Informa UK Limited ; 1970
    In:  Instrumentation Science & Technology Vol. 2, No. 4 ( 1970-01), p. 389-403
    Details
    In: Instrumentation Science & Technology, Informa UK Limited, Vol. 2, No. 4 ( 1970-01), p. 389-403
    Type of Medium: Online Resource
    ISSN: 1073-9149 , 1525-6030
    URL: Article
    DOI: 10.1080/10739147008543293
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1970
    detail.hit.zdb_id: 2020639-2
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  • 6
    Online Resource
    Online Resource
    Thermodynamic properties of boron trioxide in the glass transition region
    AIP Publishing ; 1974
    In:  The Journal of Chemical Physics Vol. 60, No. 12 ( 1974-06-15), p. 5128-5129
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 60, No. 12 ( 1974-06-15), p. 5128-5129
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1681040
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1974
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Effect of fillers on acoustic properties of silicone rubber at ultrasonic frequencies
    Acoustical Society of America (ASA) ; 1977
    In:  The Journal of the Acoustical Society of America Vol. 62, No. S1 ( 1977-12-01), p. S57-S57
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 62, No. S1 ( 1977-12-01), p. S57-S57
    Abstract: We have had a recurring need for molded articles (wave guides) and thin anechoic coatings, composed of rubbers with well defined and continuously variable acoustic properties. To fill this need, we have measured the dependence of various acoustic properties (sound speed, density, absorption) on the amount and type of filler added to RTV 602 silicone rubber. Both high impedance (ferric oxide, lead) and low impedance (glass and backlite microballons) modifiers were added, in two and three component mixes. A diluent (toluene) was found, which had no observed effect on the acoustic properties of the resulting rubber. Acoustic measurements were made using thick (molded) slabs, as well as thin (sprayed) coatings. In the latter cases, sound speed and absorption is evaluated using the measured frequency dependence of the coating's impedance. In all cases, we find that density and sound speed is well described using ideal mixture theory, providing the geometry of the microballons is taken into account. Absorption is described by simple phenomenological equations, and compared with theoretical predictions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2016266
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1977
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    Effect of an underlying compliant layer on transducer performance
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2304-2304
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2304-2304
    Abstract: The performance of acoustic transducers (sensors and actuators) can be degraded or enhanced by the structure on which they are mounted. For various numerical structural acoustics studies, a simple computationally efficient model is required for estimating the change in transducer performance resulting from variations in the front and back face impedances. The approach used here is based on simple physical principles and intuition, which makes it well suited for incorporation in more-complicated structural models since it is conducive to direct extraction of physically meaningful forcing functions. As an example of its use, the performance of pressure sensors, velocity sensors, and acoustic drivers on an air-backed steel plate are estimated, and then the change in performance when a layer of compliant material is inserted between the transducer and the plate is calculated. Results are compared with a Mason-type equivalent circuit model.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.406443
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Velocimeter for quality control monitoring in rubber production
    Acoustical Society of America (ASA) ; 1979
    In:  The Journal of the Acoustical Society of America Vol. 66, No. S1 ( 1979-11-01), p. S2-S2
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 66, No. S1 ( 1979-11-01), p. S2-S2
    Abstract: A velocimeter was designed for longitudinal sound-speed measurements on 3-mm-thick (ASTM) rubber samples. Batch-to-batch variations in sound speed are detected to 0.1% precision by operators without technical experience. Each measurement required five minutes with the prototype device, and substantial reductions are expected with minor design modifications. The device consists of two ultrasonic transducers with a rubber sample sandwiched between them. During device assembly, the sample is squeezed by the transducers such that a known and reproducible transducer-transducer separation distance is obtained. A 5-MHz cw signal is then applied to one transducer. The phase angle difference of the signal received by the other transducer is read on a meter face, and is related to the wave speed in the rubber. By performing a detailed theoretical analysis of this geometry, we are able to meaningfully compensate the value of the meter reading for variations in temperature, thickness (related to the degree of sample squeezing used), and sound absorption, and also use the device for absolute sound speed and attenuation measurements.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2017701
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1979
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    Optimization study of a parametric hydrophone with a slow waveguide
    Acoustical Society of America (ASA) ; 1979
    In:  The Journal of the Acoustical Society of America Vol. 66, No. S1 ( 1979-11-01), p. S40-S40
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 66, No. S1 ( 1979-11-01), p. S40-S40
    Abstract: The performance of a parametric hydrophone with a cylindrical slow waveguide between the pump and receiver transducers was calculated as a function of the waveguide dimensions and material properties. The computer program used is described by Corsaro and Jarzynski [J. Acoust. Soc. Am. 66, 895–904 (1979)]. The parametric conversion gain and beam patterns were calculated for waveguide lengths in the range 0.1 to 9λ, where λ is the low-frequency wavelength in water; for waveguide radius/length ratios in the range 0.03 to 0.5; and for waveguide materials with sound speeds in the range 400–1500 m/s. The general conclusion is that large gains in parametric conversion efficiency (∼20 dB) and in directivity are achievable for geometries less than a few wavelengths long, with diameter/length ratios no less than 0.1, and with material sound speeds in the range 800–1200 m/s. With longer or thinner cylinders, or with materials having speeds less than 800 m/s, the side-lobe levels increase, and both efficiency and directivity are typically reduced. These effects are predictable from Jacobi's analysis of sound propagation in slow waveguides [J. Acoust. Soc. Am. 21, 120 (1949)] .
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2017755
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1979
    detail.hit.zdb_id: 1461063-2
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