Proceedings of the IEEE

Issue 10 • Oct. 1965

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Displaying Results 1 - 25 of 97
  • [Front cover and table of contents]

    Publication Year: 1965, Page(s): c1
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  • Scanning the issue

    Publication Year: 1965, Page(s): 1285
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  • Poles and zeros: The special issue on ultrasonics

    Publication Year: 1965, Page(s): 1286
    Cited by:  Papers (1)
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  • Frontispiece

    Publication Year: 1965, Page(s):1286 - 1289
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  • Synopsis of the technical program of the 1965 ultrasonics symposium

    Publication Year: 1965, Page(s):1290 - 1291
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  • Ultrasonics in industry

    Publication Year: 1965, Page(s):1292 - 1304
    Cited by:  Papers (3)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (5795 KB)

    The most important and successful industrial applications for ultrasonics are summarized and differentiated into two categories: 1) applications where ultrasonics is employed at low power for measurement and control, and 2) applications where high ultrasonic power is employed to modify the material by the dissipation of energy. Descriptions are given of well-established uses, known uses without la... View full abstract»

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  • Ultrasonics in integrated electronics

    Publication Year: 1965, Page(s):1305 - 1309
    Cited by:  Papers (17)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1132 KB)

    The capabilities of present integrated circuits are limited since only electrical interactions in solids are being utilized. The point of view is presented that additional degrees of freedom will be obtained in the future through the use of "Functional" electronic devices which also utilize mechanical, thermal, radiation, and/or magnetic phenomena. Development of these functional devices will come... View full abstract»

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  • Sonics in the sea

    Publication Year: 1965, Page(s):1310 - 1319
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1100 KB)

    This paper outlines the fundamental aspects of the technology of sonar. Particular attention is given to the properties of the ocean that limit the propagation of underwater sound and to the inherent background noises that limit the performance of sonar. The basic choices that are available in design to meet these limitations are discussed and the present state of the art is described in broad ter... View full abstract»

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  • Ultrasonic data and the thermodynamics of solids

    Publication Year: 1965, Page(s):1320 - 1336
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1625 KB)

    This is primarily a tutorial paper on the use of ultrasonic velocity data, in conjunction with data on the specific heat and thermal expansion, to find the adiabatic and isothermal elastic coefficients and their first derivatives with respect to pressure and temperature. Introductory sections on the equations of continuum mechanics and on isentropic propagation of small-amplitude waves establish t... View full abstract»

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  • Ultrasonics in geology

    Publication Year: 1965, Page(s):1337 - 1345
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1088 KB)

    Ultrasonics is used in geology for the determination of elastic properties of rocks and minerals. For measurements on rocks, techniques with precisions of a few percent have come into use; these measure delay times of elastic waves propagating through specimens several inches long. For single crystals, the techniques are the same as those used in solid-state physics; they are basically interferome... View full abstract»

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  • Ultrasonics in liquids: Molecular phenomena

    Publication Year: 1965, Page(s):1346 - 1355
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1017 KB)

    The study of molecular phenomena in liquids using ultrasonic measurements is reviewed. Structural and isomeric relaxation are discussed in reasonable detail to illustrate the methods of research. There are brief discussions of viscoelastic and relaxation theory, techniques of measurement, vibrational relaxation, relaxation caused by molecular association, critical-point phenomena, and acoustic cav... View full abstract»

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  • Ultrasonics in chemistry

    Publication Year: 1965, Page(s):1355 - 1362
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (712 KB)

    Measurements on the velocity and the attenuation of elastic waves in solutions can reveal changes internal to the solution, such as changes in the concentrations of the constituents. Any such change is characterized by a relaxation time, and the effect on velocity and attenuation is most apparent when the wave has angular frequency equal to the relaxation time; for many situations, such frequency ... View full abstract»

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  • Ultrasonic transducers for use in air

    Publication Year: 1965, Page(s):1363 - 1371
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (860 KB)

    Fewer applications were found for the use of ultrasonics in air than for ultrasonics in liquids or solids. This was primarily because of the inherent limitations of generating high-intensity sound levels in a gaseous medium, and also because of the extremely high attenuation that accompanies in the propagation of ultrasonic energy through air. Several types of transducers are described for the gen... View full abstract»

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  • Piezoelectric transducer materials

    Publication Year: 1965, Page(s):1372 - 1386
    Cited by:  Papers (294)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1303 KB)

    Properties of piezoelectric crystals and ceramics are reviewed as they affect use of such materials in electroacoustic transducers. Extensive data on lead titanate-zirconate ceramics are presented to help in selection of the appropriate material for a variety of applications in the lower and medium frequency range, up to several megacycles per second. Quartz and several recently discovered piezoel... View full abstract»

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  • Phonon generation by magnetic films

    Publication Year: 1965, Page(s):1387 - 1399
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1332 KB)

    The generation of microwave acoustic waves by the resonance modes in a magnetic film is discussed. An initial orientation is provided by means of a review of previous research, and this is followed by a description of the experimental technique. Next, in a section on theory, equations of motion for the elastic waves with magnetostrictive driving terms are derived and solved for the case of a magne... View full abstract»

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  • Cadmium sulphide evaporated-layer transducers

    Publication Year: 1965, Page(s):1400 - 1405
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1220 KB)

    Techniques have been developed for the vacuum deposition of cadmium sulphide ultrasonic transducers for generating either longitudinal or linearly polarized shear waves over the frequency range from below 100 Mc to at least 1.8 Gc. These transducers are relatively quick and simple to make and are considerably more efficient and wider in bandwidth than those presently used in this frequency range. ... View full abstract»

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  • A survey of ultrasonic delay lines operating below 100 Mc/s

    Publication Year: 1965, Page(s):1406 - 1428
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3687 KB)

    The types of ultrasonic delay lines in common use are described, their limitations are noted, and important design considerations are outlined. Particular attention is given to recently evolved dispersive lines suitable for radar pulse compression systems. View full abstract»

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  • Microwave solid-state delay lines

    Publication Year: 1965, Page(s):1428 - 1437
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1368 KB)

    The low-loss propagation of microwave phonons at room temperature in certain single crystals makes practical the construction of microwave acoustic delay (MAD) lines. The properties of these solid-state units are discussed and compared to those of more conventional microwave delay devices. Various possible applications of solid-state lines are suggested and the present status of these units is rev... View full abstract»

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  • Ultrasonic loss and gain mechanisms in semiconductors

    Publication Year: 1965, Page(s):1438 - 1451
    Cited by:  Papers (67)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1487 KB)

    Several kinds of interactions of ultrasound in semiconductors are reviewed. The subjects discussed are the effects of interaction with 1) thermal phonons, which produce temperature dependent attenuation; 2) free carriers, which may give attenuation or amplification; 3) electrons bound to shallow donors, giving rise to attenuation at low temperatures; and 4) other ultrasonic waves, which may give a... View full abstract»

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  • Ultrasonic effects in piezoelectric semiconductors

    Publication Year: 1965, Page(s):1452 - 1464
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1976 KB)

    Several interesting phenomena involving the interaction of ultrasonic waves and electrons have been observed in piezo-electric semiconductors. These include the processes of ultrasonic amplification and nonlinear harmonic generation, which are manifestations of the action of electrons on ultrasonic waves. The reaction upon the electrons as a result of their strong coupling to ultrasonic waves is m... View full abstract»

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  • Electronic signal amplification in the UHF range with the ultrasonic traveling wave amplifier

    Publication Year: 1965, Page(s):1465 - 1485
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1520 KB)

    Traveling-wave amplification of elastic waves in piezoelectric material can be used to produce net electrical power gain over a wide range of frequencies. It is of interest to estimate how the gains, bandwidths, and noise figures potentially obtainable with this kind of amplifier compare with those for amplification by more traditional methods. Attention is limited to the frequency range such that... View full abstract»

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  • Elastic and magnetoelastic waves in yttrium iron garnet

    Publication Year: 1965, Page(s):1485 - 1495
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1140 KB)

    A discussion of plane elastic and magnetoelastic waves follows a statement of the linearized equations of motion of coupled spin and elastic waves. The dispersion equations of θ = 0 and θ = π/2 waves are examined in detail. A description of the generation and propagation of magnetoelastic waves in a nonuniform magnetic field prepares the way for a review of selected experiments whic... View full abstract»

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  • Generation of spin waves in nonuniform magnetic fields, with application to magnetic delay lines

    Publication Year: 1965, Page(s):1495 - 1507
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1302 KB)

    The theory of spin-wave generation in nonuniform magnetic fields is reviewed. Detailed theoretical results concerning the photon-magnon conversion, the magnon-phonon conversion, the frequency- and field-dependence of the delay time, and the insertion loss are presented. A general theory of the nonuniform demagnetizing field of nonellipsoidal samples is described. Experimental results concerning th... View full abstract»

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  • Magnetoelastic coupling constants of the ferrites and garnets

    Publication Year: 1965, Page(s):1508 - 1517
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1014 KB)

    Magnetoelastic coupling has proven useful in microwave-frequency delay lines and amplifiers. Techniques for measuring the magnetoelastic coupling constants are reviewed here, and some results for the ferrites and garnets are given. The microscopic origin of magnetoelasfic coupling is also discussed. View full abstract»

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  • Nonlinear magnetoelastic interactions

    Publication Year: 1965, Page(s):1517 - 1533
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1738 KB)

    The physical basis for magnetoelastic coupling is presented in terms of simple models. These models are used to illustrate the magnetoelastic nonlinearities present in real crystals, and an enumeration is made of the instabilities which can be excited by means of these nonlinearities. Published material on instability theory and experiments is reviewed, and current possibilities for device applica... View full abstract»

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North Carolina State University